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EK-RL122-TM-001

August 1982

173 pages

Original

5.9MB

Document:	RL01/RL02 Technical Manual Volume II - Service Procedures
Order Number:	EK-RL122-TM
Revision:	001
Pages:	173
Original Filename:

OCR Text

EK-RL122-TM-OOl

Rl01/Rl02
Technical Manual
Volume 11- Service Procedures

EK-RL122-TM-OOl .

RL01/RL02
Technical Manual
. Volume II - Service Procedures

Prepared by Educational Services
of
Digital Equipment Corporation

1st EDITION, AUGUST 1982

The material in this manual is for informational purposes and is subject to change
without notice.
Digital Equipment Corporation assumes no responsibility for any errors which

may appear il His manual.
Printed in U.S.A.
This document W88 set on DIGITAL's DECset-8000 computerized typesetting system.
•

Class A Computing Devices:

Notice: This equipment generates, usesJ and may emit radio frequency energy.
The equipment has been type tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J of Part 15 of FCC Rules~ which
are designed to provide reasonable protection against such radio frequency interference when' operated in a commercial environment. Operation of this equipment in a residential area may cause interference in which CBse the user at his
own expense may be required to take measures to correct the interference.

The following are trademarks of Digital Equipment Corporation, Maynard, Massachusetts:

DEC

DECnet

DIGITAL

DECsystem-10
DECSYSTEM-20
DECwriter

DECUS

Digital Logo

PDP

DBOL

UNIBUS
VAX

EduSystem

lAS
MASSBUS

OMNIBUS
OS/8

PDT

RSTS
RSX
VMS
VT

CONTENTS

Page
CHAPTER 1
1.1
1.1.1
1.1.2
1.1.3
1.1.4
1.2
i.2.1
1.2.2
1.2.2.1
1.2.2.2
1.2.2.3
1.2.2.4
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
CHAPTER 2
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4 .
2.2.5
2.3
2.3.1
2.3.2
2.4
2.4.1
2.4.2
2.5
2.5.1
2.5.2
2.5.3

INTRODUCTION
MAINTAINABILITY FEATURES
Hardware Maintenance Plan ....................................... .
Additional Documentation ......................................... .
Field Replaceable Units ........................................... .
Recommended Spare Parts List ..................................... .
SOFTWARE RESOURCES .......................................... .
Diagnostics ..................................................... .
Diagnostic Supervisor ............................................ .
Hardcore Questions .......................................... .
Console Controls ............................................ .
Hardware Questions .......................................... .
Software Question ........................................... .
MAINTENANCE CONTROLS AND INDICATORS ....................... .
Power ON/OFF Circuit Breaker .................................... .
Power Terminal Block Assembly .............. ; .................... .
Run/Stop Switch with LOAD Indicator .............................. .
Unit Select (0, 1, 2, 3) Switch with READY Indicator ................. .
FA ULT Indicator ................................................ .
WRITE PROTect Switch and Indicator ........................................

1-1
1-1
1-1
1-1
1-4
1-5
1-5
1-5
1-5
1-8
1-8
1-8
1-8
1-8
1-8
1-10
1-11
1-11
1-11

REMOVAL AND REPLACEMENT PROCEDURES
INTRODUCTION....................................................
FRONT BEZEL AREA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prefilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Board ................................................
Slides ..........................................................
ACCESS COVERS ...................................................
Field Service Access Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Access Cover ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BRUSH AREA ......................................................
Brush Drive ......................................................
Brush Tips ......................................................
MODULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Servo Module ................................................
DC Servo Module ................................................
Drive Logic Module ..............................................

111

2-1
2-1
2-1
2-3
2-4
2-6
2-8
2-8
2-8
2-11
2-12
2-12
2-15
2-17
2-17
2-17
2-19

Page

CHAPTER 2
2.5.4
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.7
2.7.1
2.7.1.1
2.7.1.2
2.7.1.3
2.7.2
2.8
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
CHAPTER 3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
APPENDIX A
A.1
A.1.1
A.1.2
A.1.2.1
A.1.2.2
A.1.2.3
A.1.2.4
A.1.2.5
A.1.2.6
A.1.2.7
A.1.3
A.1.3.1

REMOVAL AND REPLACEMENT PROCEDURES (CONT)
Read/Write Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPINDLE AREA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Belt From Spindle Pulley ..........................................
Spindle Ground Button ....................... ~ . . . . . . . . . . . . . . . . . . . .
Spindle ..........................................................
Sector Transducer ................................................
rosmoNER AREA .................................................
Positioner .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positioner in Early RLOI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positioner in Newer RL01 and Any RL02 .. . . . . . . . . . . . . . .. . . . . . . . .
New Head Cable Guide in Older RL01 ...........................
Read/Write Heads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . .
REAR PANEL AREA ............. ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply ................................... '. . . . . . . . . . . . . . . . .
Spindle Drive Belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Fan ................................................
Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spindle Drive Motor ................................ ~ . . . . . . . . . . . . .

2-20
2-25
2-25
2-25
2-28
2-28
2-30
2-30
2=30
2-32
2-34
2-36
2-38
2-38
2-41
2-43
2-44
2-45

CHECKS, ADJUSTMENTS AND ALIGNMENTS
INTRODUCTION....................................................
VOLTAGE CHECKS .................................................
SECTOR TRANSDUCER OUTPUT CHECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTOR PULSE TIMING CHECK .....................................
READ SIGNAL AMPLITUDE ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . .
rosmoNER RADIAL ALIGNMENT...................................
HEAD ALIGNMENT. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . .
SPINDLE RUNOUT CHECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
rosmoN SIGNAL GAIN CHECK.....................................
TACHOMETER AC NOISE PICK-UP CHECK............................
VELOCITY PROFILE CHECK.........................................
SERVO DRIVE MOTOR CURRENT CHECK............................ .
ACCESS TIME CHECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1
3-4
3-4
3-5
3-6
3-10
3-14
3-17
3-18
3-20
3-21
3-23
3-24

REGISTER SUMMARY
PROGRAM ACCESSmLE REGISTERS FOR II-FAMILY CONTROLLERS .. .
Register Description .............................................. .
CSR Error Code Defmitions .....................................
Operation Incomplete (OP!) ................................... .
Data CRC (DCRC) or Write Check (WCE) ....................... .
Header CRC (HCRC) ........................................ .
Data Late (DLT) ............................................ .
Header Not Found (HNF) ..................................... .
Non-Existant Memory (NXM) ................................. .
Memory Parity Error (MPE) ................................... .
Command Function Code Descriptions ............................... .
Write Check - Function Code I ................................ .
e

A-I
A-2
A-8
A

rI.-O

A-8
A-9
A-9
A-9
A-9
A-9
A-9
A-9

Page
APPENDIX A
A.1.3.2
A.1.3.3
A.1.3.4
A.1.3.5
A.1.3.6
A.1.3.7

APPENDIX B
B.I
B.1.1
B.1.1.1
B.1.1.2
B.1.1.3
B.1.1.4
"011,
.LJ.~ •

..l • .J

B.1.1.6
B.1.1.7
B.1.1.8
B.1.1.9
B.l.1.IO
B.1.1.I1
B.1.2
B.1.3
B.1.3.1
B.1.3.2
B.1.4
B.1.5
B.2
B.3
B.4
B.5
B.5.1
B.5.2
B.5.3
B.5.4
B.6
B.6.1
B.6.2
B.6.3
B.6.4
B.6.5
B.6.6
B.6.7
B.6.8
B.6.9
B.7
B.?I

REGISTER SUMMARY (CONT)
Get Status - Function Code 2 .................................. .
Seek - Function Code 3 ....................................... .
Read Header - Function Code 4 ................................ .
Write Data - Function Code 5 .................................. .
Read Data - Function Code 6 .................................. .
Read Data Without Header Check - Function Code 7 ............... .

A-IO
A-IO
A-IO
A-IO
A-IO
A-II

INSTALLATION
SITE PREPARATION AND PLANNING ................................ .
Environmental Considerations ...................................... .
Cleanliness ................................................. .
Space Requirements ... '.' ..................................... .
Floor Loading ............................................... .
Heat Dissipation ............................................. .
.l.A::a.coustics .......................;;;;;;;;;.: = = = = = = = = = ~
Tem]Jerature ................................................ .
Relative Humidity ............................................ .
Altitude ...................................................... .
Power and Safety Precautions .................................. .
Radiated Emissions .......................................... .
Attitude/Mechanical Shock .................................... .
Options ........................................................ .
AC Power Requirements .......................................... .
Standard Applications ........................................ .
Optional. Applications ........................................ .
Grounding Requirements .......................................... .
Installation Constraints ........... , ............................... .
AC CABLING ...................................................... .
INSTALLATION - GENERAL ........................................ .
RLII CONTROLLER INSTALLATION ................................. .
RLVIII CONTROLLER INSTALLATION ............................... .
Bus Interface Module ............................................ .
Drive Module ................................................... .
Module Slot Location ............................................ .
Module Installation ............................................... .
RLVI2 CONTROLLER INSTALLATION ............................... .
Introduction .................................................... .
Device Address Selection ......................................... .
Bus Selection ......... ~ ......................................... .
Interrupt Vector ................... ~ .. ~ .......................... .
Interrupt Request Level ........................................... .
Memory Parity Error Abort Feature ................................ .
Other Jum]Jers .................................................. .
Installation ...................................................... .
Acceptance Testing .............................................. .
RL8A CONTROLLER INSTALLATION ............................... .
Introduction .................................................... .
Je

•

B-1
B-1
B-1
B-1
B-1
B-1
B-2
B-2
B-2
B-2
B-2
B-2
B-3
B-3
B-5
B-5
B-5
B-7
B-8
8-8

B-12
B-I2
B-I7
B-I7
B-20
B-20
B-21
B-22
B-22
B-22
B-26
B-26
B-26
B-26
B-2?
B-2?
B-28
B-28
B-28

Page

APPENDIX B
B.7.2
B.7.3
B.8
B.8.1
B.8.2
B.8.3
B.8.4
B.9
0.9.1
B.9.2
B.9.3
B.10
APPENDIX C
C.1
C.2
C.3
C.4
C.S
C.6
APPENDIX D
D.1
D.2

INSTALLATION (CONT)
Module Slot Location ............................................ .
Module Installation ............................................... .
RL01/RL02 DISK DRIVE INSTALLATION ............................ .
Unpacking and Inspection ........................................ .
RL01/RL02 Disk Drive Unit Mounting ............................. .
Drive Prestart-up Inspection ....................................... .
Drive Start-up Operation Check ................................... .
CONFIDENCE TESTING ............................................ .
RL II-Based Diagnostics ......................................... .
RL V11/RLV 12-Based Diagnostics ................................. .
RL8A-Based Diagnostics ......................................... .
USE OF THE M9312 BOOTSTRAP WITH AN RLll SUBSYSTEM ........ .

B-28
B-28
B-30
B-30
B-31
B-37
B-39
B-39
n
AI'\
D-"+U

B-42
B-43
B-44

TOGGLE-IN PROGRAMS
HEAD SELECTION PROGRAM FOR RLI1/RLV11/RLV12 ................
HEAD SELECTION PROGRAM FOR RL8A .............................
GET STATUS (WITH OR WITHOUT RESET) ON AN RL11/RLV11/RLVI2 .
SUBSYSTEM ...................................................
GET STATUS ON AN RL8A SUBSYSTEM .............................
OSCILLi~lLTING SEEK FOR RLll!RLVl1!RLV12 .........................
OSCILLATING SEEK FOR RL8A .....................................

C-1
C-2
C-3
C-4
C-5
C-6

RLll CONFIGURATION AND INSTALLATION CONSIDERATIONS
SPC CONSIDERATIONS .............................................
CONFIGURATION CONSIDERATIONS ................................

D-l
D-2

FIGURES
1-1
1-2
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14a
2-14b

RL01/RL02 Disk Drive Controls and Indicators
(Front Panel) ....................................................
RL01/RL02 Disk Drive Controls and Indicators
(Rear Panel) ....................................................
Removal and Replacement Sequence Flowchart ............................
Front Bezel .........................................................
Absolute Filter Access ................................................
Absolute Filter ......................................................
Front Panel Printed Circuit Board .......................................
Slide Rails ..........................................................
Field Service Access Cover ............................................
Module Location .....................................................
DC Servo Module ....................................................
Exposed Drive Baseplate ..............................................
Exposed Brush Drive Assembly .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Servo Module ....................................................
Drive Logic Module W 1 Location ......................................
Read/Write Module (Upright) Old Style ................................. :
Read/Write Module (Upright) New Style. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9
1-10
2-2
2-3
2-4
2-5
2-7
2-9
2-10
2-11
2-13
2-14
2-16
2-18
2-19
2-21
2-22

Page
FIGURES (CONT)
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
2-26
2-27
2-28
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8
B-9
B-I0
B-ll
B-12
B-13
B-14
B-15
B-16
B-17
B-18
B-19
B-20

Read/Write Module Box Disassembly ................................... .
Spindle Access Cover ................................................ .
Spindle Ground Button ............................................... .
Sector Transducer Mounting ........................................... .
Positioner Assembly ................................................. .
Head Cable Guide ...............................".................... .
Location of Plastic Insulating Sticker ........................ : .
Read/Write Heads ....
Rear View of Drive ..
Rear Panel Assembly .
Drive Motor Mounting .
Drive Belt Tension
Circuit Breaker ...
Drive Motor Assembly Technique ...
Drive Logic Module Layout o.
Sector Transducer Output o.
Sector Pulse Timing ............................
Positioner and Read/Write Module Box Assembly ...
Servo Bursts and Sector Pulse ..................
Amplitude Adjustments POT Locations ..
~
Positioner Assembly .................
Position Signal .
Position Signal Gain Check Waveforms ......
Summing Amplifier Output .......
~
Tachometer Output Velocity Signal .........................
Positioner Motor Current Check ..........................
Access Time Check (One Track Seek) ......................... ".......... .
Access Time Check (85 Track Seek) .................................... .
Access Time Check (255 Track Seek) ....... _....................... -. ... .
RLOI/RL02 Disk Drive - Rear View ..................................
Approved Electrical Plugs and Receptacles ...............
Power Panel Grounded to Building Frame ..............
Power Panel Grounded to Metal Plate ..
Typical 60 Hz Power System ....
Typical 50 Hz Power System ....
Split Phase (2-Phase) Power System ...........
Three Phase Y Power System
RLll Component Layout ..............
RLll Base and Vector Address Jumper Configurations ...........
RLll Priority Jumper Assembly Connections .............
RLll Controller Installation .
RLVII Bus Interface Module (M8014) (Component Side)
RLVII Base Address Switch Settings ......
RL V 11 Vector Address Switch Settings ...............
RLVl1 Drive Module (M8013) ...........
H9273 Backplane Grant Priority Structure ..
RLV12 Jumper Locations ...............
RL V12 Device Address Format ....
RL V12 Format Interrupt Vector
0

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2-24
2-26
2-27
2-29
2-31
2-33
2-35
2-37
2-39
2-40
2-42
2-43
2-44
2-45
3--1
3-5
3-6
3-7
3-8
3-9
3-13
3-18
3.. 19
3-21
3-22
3-24
3-25
3-25
3-26
B-5
B-6
B-7
B-8
B-9
B-Il
B-I0
B-I0
B-12
B-14
B-15
B-16
B-18
B-19
B-19
B-20
B-21
B-24
B-25
B-26

Page
FIGURES (CONT)
B-21
B-22
B-23a
B-23b
B-24
B-25
B-26
B-27

RL8A JumJ>ers ...................................................... .
H950 Shipping Package .......... : .................................... .
RLOI/RL02 Cabinet Installation ........................................ .
RLO I/RL02 Cabinet Installation ........................................ .
RLOI/RL02 Disk Drive - Exposed Drive Logic Module .................... .
RLOI/RL02 - Covers Removed ........................................ .
RLOI/RL02 Disk Drive - Rear View .................................... .
RLOl/RL02 Disk Drive - Front View ................................... .

B-29
B-30
B-32
B-33
B-34
B-35
B-36
B-37

RLOI/RL02 ........................................................ .
FRU Part Numbers and Interchangeability ................................ .
Recommended Spare Parts List ......................................... .
Diagnostic SUJ>ervisor Commands ...................................... .
Command Parameters ................................................ .
Service JumJ>ers for Drive Logic Module ................................ .
Methods for Selecting Heads .......................................... .
Subsystem Registers Overview ......................................... .
Control Status Register Bit Description .................................. .
Bus Address Register Bit Description ................................... .
Disk Address Register Bit Description for Seek
Commands ..................................................... .
Disk Address Register Bit Description for Data
Transfer Commands .............................................. .
Disk Address Register Bit Description for Get
Status Commands ................................................ .
MP Register Bit Description for Get Status Commands ..................... .
MP Register Bit Description for Read Header Commands ................... .
MP Register Bit Description for Data Transfer Commands .................. .
RL8A Instruction Set ................................................. .
Command Register A During a Seek Command ........................... .
Command Register A During Read or Write Data Command ................ .
Command Register B ................................................. .
Break Memory Address Register ....................................... .
Word Count Register ................................................. .
Sector Address Register ............................................... .
Error Register ....................................................... .
Silo Buffer Word 1 of a Get Status Command ............................ .
Silo Buffer Word 2 of a Get Status Command ............................ .
Silo Data Buffer Contents Following a Read Header
Command ........................................................ .

1-2
1-2
1-4
1-6
1-7
3-3
3-3
A-I
A-2
A-4

TABLES
1-1
1-2
1-3
1-4
1-5
3-1
3-2
A-I
A-2
A-3
A-4
A-5
A-6
A-7
A-8
A-9
A-I0
A-II
A-12
A-13
A-14
A-15
A-16
A-17
A-18
A-19
A-20
B-1
B-2
B-3
B-4
B-5
B-6

Saleable RLOI/RL02 Subsystem Options ................................. .
Saleable Cabinet Options: (Includes Skins, Doors, Covers,
Trim, and Power Controllers) ...................................... .
Address Selection .................................................... .
Diagnostic Catalogs and Indexes ....................................... .
RL 11 Based Diagnostics ............................................. : .
RLII Diagnostic Kit Numbers ......................................... .

viii

A-4
A-5
A-5
A-5
A-7
A-8
A-II
A-12
A-13
A-14
A-15
A-15
A-15
A-16
A-17
A-18
A-19
B-3
B-4
B-23
B-40
B-40
B-40

Page
TABLES (CONT)
B-6
B-8
B-9
B-I0
B-ll
B-12
B-13

RLII Diagnostic Components .......................................... .
User Documents ..................................................... .
RLVl1/RLV 12 Diagnostic Kit Designations .............................. .
RL8/RLOI Diagnostic Components ..................................... .
RL8/RLO 1 Diagnostic Kits ........................".................... .
RL8A Diagnostic Kits .......................... '.' .................... .
RL8/RL02 Diagnostic Components ..................................... .

B-41
B-42
B-42
B-43
B-44
B-44
B,..45

CHAPTER 1
INTRODUCTION

This chapter defines the maintenance philosophy and acquaints the reader with the structure of this
portion of the manual. It defines the required resources available to correctly maintain the RLOI /RL02
disk subsystem. The maintenance controls and indicators are also discussed here.
1.1 MAINTAINABILITY FEATURES
The following paragraphs summarize the RLO 1 and RL02 hardware maintenance plans. The manual
organization is outlined and an overview of the various troubleshooting techniques is discussed. A listing of Field Replaceable Units (FRUs) is also given.
1.1.1 Hardware Maintenance Plan
Serviceability has been a major consideration in the design of the RLO 1/RL02 disk subsystem. A large
portion of the drive electronics has been incorporated on one logic module, the drive logic board. The
remaining electronics exist on the read/write module, dc servo module, ac servo module, and the front
panel.
The removaljreplacement capability is accomplished without the aid of special alignment fixtures or
tools. These designed-in features readily permit a maintenance philosophy of module or subassembly
replacement. Therefore, the troubleshooting strategy is to isolate the failing module or subassembly and
replace it.
1.1.2 Additional Documentation
Table 1-1 lists the hardware documentation that is available to support the RLOI /02 Disk Subsystem.
1.1.3 Field Replaceable Units
Table 1-2 is a list of RLOI /RL02 Field Replaceable Units (FRUs). Some of the FRUs contain components that are easily checked and replaced. In these cases, an FRU may be repaired instead of replaced. For example, a lamp may be replaced on the front panel or a pico fuse replaced on the DC
Servo module. The decision to replace or repair an FRU should be based on such local considerations as
part availability, etc.
t

Some of the FRUs are interchangeable between the RLOI and RL02 and some are not. The interchangeability is indicated in Table 1-2.

1-1

Table 1-1

RLOlj02 Documentation

Microfiche
Number

HardCopy
Number

RL 11 Controller Technical Description
Manual

EP-ORLII-TD

EK-ORLII-TD

RL V I I Controller Technical Manual

EP-RLVII-TD

EK-RLVII-TD

RL8A Omnibus Controiier Technicai
Manual

EP-ORL8A-TM

EK-ORL8A-TM

RLO 1 Disk Drive Illustrated Parts
Breakdown

EP-OOO 16-IP

EK-ORLOI-IP

RL02 Disk Drive Illustrated Parts
Breakdown

EP-000I6-IP

EK-ORL02-IP

RLOI /RL02 Preventive Maintenance
Procedures

EP-00008-PM

EK-RLOI2-PM

RLOI/RL02 Pocket Service Guide

.... T I ...

I/"\.

EK-RLTER-PS

RLOI /RL02 Disk Subsystem User's
Guide

N/A

EK-RLOI2-UG

RL V 12 Disk Controller User's Guide

N/A

EK-RLVI2-UG

RL V 12 Controller Technical
Description Manual

EP-RLVI2-TD

EK-RLVI2-TD

Name

Table 1-2

FRU Part Numbers and
Interchangeability

RLOI Part

RL02 Part

FRU

Number

Read/Write Module
DC S'ervo Module
Template for DC Servo
Drive Logic Module (DLM)

54-11844
54-11850
74-18588
54-12175 (early)
54-12175 Rev KeD

54-13536
54-13534
74-20826
54-13531 (early)
54-14025 (later)
54-14025 Rev Ll(!)

1-2

Table 1-2

FRU Part Numbers and
Interchangeability
(Cont)

FRU

RLOlj02 Part
Number

Spindle
5 amp fuse (DC Servo)
AC Servo Module
Front Panel
Front Panel Lamp (GE 73)
Sector Transducer

70-15116
12-05747-00
54-11848
54-11846
12-12716-01
70-12137

Positioner
Brush Drive Assembly
Brush Assembly
Spindle/Blower Motor·
Spindle Drive Belt

70-12117
70-12112
70-16726
70-12114
12-13369

Spindle Ground Brush
Coarse Filter
Absolute Filter
I/O Terminator
Cartridge Access Cover Roller Guides

74-15294
74-15297
12-13097-00
70-12293-00
74-21977

Cover Switch Assembly 1
Head Cable Guide
Insulating Sticker
Power Panel
•
Cooling fan
•
Transition Connector

70-16991
70-16983
74-22834
70-12130
12-09403-01
12-11591-35

FRU

RLOI Part
Number

RL02 Part
Number

Upper Head
Lower Head

74~17178-O1

74-17178-00

70-15637-01
70-15637-00

NOTE
All part numbers denoted with aQ)represents those
FRUs that must be used in RLOls or RL02s that do
not have cleaning brushes.

1-3

1.1.4 Recommended Spare Parts List
Table 1-3 shows the Recommended Spare Parts List.
Table 1-3 Recommended Spare Parts List

Part
Number

70-12.130
54-11844
54-12526
54-11846
54-11848
54-11850
54-13534
54-12175

Description

Power Panel

Branch
Stocked

Spares
Kit

...Rp~~
"'...., ...... IWr;tp
...... .a. ..... '" Mn~111p
.a.,,--... ...... ....,

N
y

(RLOlonly)
Read/Write Module
(RL01, RL02)

Y
Y
Y

Y
Y

N
y
N

,L ..

Front Panel Board
AC Servo Module
DC Servo Module
(RLOlonly)
DC Servo Module
(RLOl, RL02)

70-12107

Drive Logic Module
(RLOlonly)
Drive Logic Module
(RLOl, RL02)
Front Panel Cable

70-12108
70-12109
70-12110
70-12112
70-12114

Harness Power Panel
Line Cable
Cooling Fan Cable
Brush Drive Assembly
Disk Motor Assembly

70-12117
70-12119
70-12120

Positioner Assembly
Rear Cover
Spindle Assembly
(RLOlonly)
Spindle Assembly
(RLO 1, RL02)

Y
N
Y

Cover Switch Assembly
(RLOl, RL02, DRIVES
without brushes)
Cable Logic
Brush/Door Harness
Terminal Block Assembly
Positioner Harness
Transducer Assembly

N
N
Y
N
Y

N
N
N
N
y

54-14025

70-15116
70-16991
70-12123
70-12126
70-16852-01 A
70-12136
70:..12137

Y
Y

1-4

N
N
Y
N
N
N

Table 1-3 Recommended Spare Parts List (Cont)
Part
Number

Description

Branch
Stocked

Spares
Kit

70-12139-01
70-12139-02
70-12140
70-12142
12-13369

Read/Write Cable
AC Servo Cable
DC Power Harness
Power Harness
Drive Belt

N
N
N
N
Y

74-15297
12-13097-03
74-17178-00
74-17178-01
70-15637

Prefilter
Absolute Filter
Head "A" Up (RL01)
Head "A" Down (RL01)
Head "A" Up (RL02)

Y
Y
Y
Y
Y

N
N
Y
Y
Y

70-15638
RLOIK-DC
RL02K-DC
70-12293
70-12139-OD

Head "A" Down (RL02)
Cartridge (RL01)
Cartridge (RL02)
Terminator
DC Servo Cable

Y
Y
Y
Y
N

Y
N
N
N
N

74-15231
12-09403-01
12-14360-02

Gasket, Blower
Fan
Circuit Breaker

Y
Y
N

N
N
N

1.2 SOFTWARE RESOURCES
1.2.1 Diagnostics
The various diagnostics available for RL8A, RLII, RLVI2, and RLVll-based subsystems are described in Appendix B, Paragraph B.9, "Confidence Testing".
1.2.2 Diagnostic Supervisor
All of the diagnostics are run under the Diagnostic Supervisor. When one of the diagnostics is called
up, the Supervisor asks a series of questions that enables the operator to set various parameters governing the specific diagnostic. The various commands the Supervisor will accept are summarized i~ the
followjng paragraphs. (Questions whose answers are self-evident are not explained here.)
1.2.2.1 Hardcore Questions - Several of the questions that the Supervisor will ask do not have simple
yes or no answers. These include the questions explained below.
The Supervisor will display the statement "TYPE TWO CHARACTERS FOUR SECONDS
APART" when no clock is on the system. The system will then subdivide the spacing for use as a clock.
The four second interval should be as accurate as possible.
The prompt "DS-C>" is requesting one of eleven supervisor "commands" listed in Table 1-4.

1-5

Table 1-4 Diagnostic Supervisor Commands

Command

Description

STA

STArt diagnostic and then produce questions for generation of the diagnostic parameter tables ("P" tables).

RES

REStart diagnostic at the point following the hardware questions. The "P" tables set
up by the STA command will be used.

CON

CONtinue the diagnostic at the beginning of the subroutine that was being executed
when the diagnostic was halted by an error or control "e".

PRO

PROceed testing with the diagnostic at the starting address of the subroutine following
the one that caused the error report.

DIS

DISplay the hardware "P" tables for all the drives under test.

DRO

DROp the desired units from being tested. "UNITS", in this case, refers to the "P"
table units, not necessarily the device unit numbers. The DIS command will give the
operator the drive unit number.

ADD

ADD units back into the testing sequence after they had been dropped by the DRO
command.

PRI

PRInt any performance or statistical tables accumulated by the diagnostic.

FLA

FLAgs command - The current setting of all the flags set up under the STA command
are printed out for inspection.

ZFL

Zero FLags command - All current flags set by the STA command are cleared by this
command.

CCI

Create Core Image command - This command enables a BIC file to be created on
these diagnostics to be run under the XXDP media. (See listing for directions.)

NOTE
The last character in the prompt (in this example a
"C") reflects the revision level of the diagnostic supervisor. The example in this text is DS-C>. Diagnostic Supervisor revision "C".
Program Parameter Changes - Type in any combination of the parameters listed in Table 1-5 to affect
the indicated commands.

1-6

Table 1-5 Command Parameters

Command

Parameter

STA

DS-C>STA/TESTS: (insert test numbers desired from the test lists in the individual
diagnostic listings; e.g. 1:2 means tests 1 and 2, or 1-5:8-10 means tests 1 through 5 and
8 through 10.)
DS-C>STA/TESTS:6/PASS: (insert the number of passes the diagnostic should take
before halting)
DS-C>STA/TESTS:6/PASS:2/FLAGS: (insert any of these mnemonic(s) representing a program flag(s»:
HOE - Halt On Error
LOE - Loop On Error
IER - Inhibit Error Report
IDE - Inhibit Basic Error reporting
IXE - Inhibit eXtended Error reporting
PRI - PRInt messages on line printer
PNT - PriNt Test numbers as they are being executed
DOE - Bell On Error
UAM - Bypass manual intervention tests
ISR - Inhibit Statistical Reports
IDR - Inhibit DRopping of units
DS-C>STA/TESTS:6/PASS:2/FLAGS:IER:PNT:BOE:IDR/EOP: (insert a number equaling the pass intervals at which the End Of Pass message will be printed; e.g.
every other pass, every third pass, etc.)
For example, utilizing all the possible parameter changes, the STA command would
look like this:
DS-C>STA/TESTS:6/PASS:2/FLAGS:IER:
PNT:BOE:IDR/EOP:3

RES

Use TESTS, PASS, FLAGS and/or UNITS to, be tested; e.g. DSC> RES/TESTS:6/UNITS:l (this will run only test 6 on the device specified in "P"
table 1)

CON

Use PASS or FLAGS only

PRO

Use FLAGS only

DRO

Use UNITS only

DIS

Use UNITS only

ADD

Use UNITS only

1-7

Table 1-5 Command Parameters (Cont)
Command

Parameter

PRI

No variations

FLA

No variations

ZFL

No variations

CCI

Use TESTS, PASS or FLAGS

1.2.2.2 Console Controls - There are three console controls that can be used to affect a running diagnostic. They are all typed by holding down the "CONTROL" key while typing the specific letter.
Control "e" causes testing to cease and a return to the start (DS-C».
Control "Z" causes default values to be taken in any of the three operator dialogues.
Control "0" causes a supression of typeouts for the remainder of the diagnostic or until another control
HO" is typed.
1.2.2.3 Hardware Questions - It is during the hardware question portion of the Supervisor that the
"P" (parameter) tables are built. There is one "P" table for every unit to be tested. Also, "UNITS"
pertains to the "P" table number, not the device unit number. If there is doubt as to which unit number
has been assigned to which drive, the DIS command (see Table 1-4) will supply the necessary information.
1.2.2.4 Software Question - The question "CHANGE SW(L)?" asks if any of the software parameters are to be changed. A "Y" will cause the program to ask various questions. For more detail refer to
the individual program document.
1.3 MAINTENANCE CONTROLS AND INDICATORS
Figures I-I and 1-2 show all RLOI/RL02 Disk Drive controls and indicators.
1.3.1 Power ON/OFF Circuit Breaker
When the ac power plug is inserted into a 115/230 Vac, 50/60 Hz outlet, ac power is applied to the
rear panel circuit breaker on the drive. When the circuit breaker is turned on, ac power is applied to the
drive and the blower motor is energized.
1.3.2 Power Terminal Biock Assembiy
The RLOI/RL02 Disk Drive operates within two ac line voltage ranges at either 50 or 60 Hz:
•
•

90 - 128 Vac
180 - 256 Vac

These voltage ranges may be manually selected by changing the position of the terminal block. assembly
covers located at the rear of the drive. Refer to Figure 1-2.

1-8

LOAD SWITCH
AND INDICATOR
UNIT SELECT PLUG
AND READY INDICATOR

FAULT
INDICATOR
WRITE PROTECT SWITCH
AND INDICATOR
CZ-1005

Figure 1-1

RLO 1/RL02 Disk Drive Controls
and Indicators (Front Panel)

1-9

110/220 VOLTS
TERMINAL
BLOCK COVER

CZ-1056

Figure 1-2

RLOI/RL02 Disk Drive Controls
and Indicators (Rear Panel)

1.3.3 Run/Stop Switch with LOAD Indicator
This push on/push off switch, when depressed, energizes the spindle motor providing all of the following conditions have been met.
•

The disk cartridge has been installed

•

The cartridge protective cover is in place and the cartridge access door is closed

•

All ac and dc voltages are within specifications

•

The read/write heads are home (retracted)

•

The brushes are home (on those drives that have brushes)

When the run/stop switch is released, the spindle drive motor is de-energized if the read/write heads
are not loaded. If the heads are loaded, they are immediately retracted and the spindle drive motor is
then de-energized.
NOTE
In the event of a Seek Time-out error (SKTO) the
heads do not retract and the disk remains spinning.

1-10

In the event of a main power interrupt and subsequent power restoration, the drive will recycle up if the
switch is in the depressed state since it contains mechanical memory.
The LOAD enable indicator is illuminated whenever all of these conditions have been met.
•
•
•

The spindle is stopped
The read/write heads are home
The brushes are home (on those drives that have brushes)

1.3.4 Unit Select (0, 1, 2, 3) Switch with READY Indicator
The unit select switch is a cam operated switch which is actuated by inserting a numbered, cammed
button. The switch contacts are binary encoded so the drive interface logic recognizes the matching
controller generated drive address code and the corresponding unit select number (0, 1, 2, or 3).
The numbered indicator, when lit, indicates a drive READY condition. Drive READY exists when
both of the following conditions are met.
•
•

The read/write heads are loaded
The heads are detented on a specific track

1.3.5 FAULT Indicator
The FAULT indicator is lit whenever any of the following fault or error conditions develop in the disk
drive.
•
•
•
•
•
•
•

Drive select error
Seek time out error
Write current in .heads during sector time error
Loss of system clock
Write protect error
Write data error
Spin error

1.3.6 WRITE PROTect Switch and Indicator
When this switch is pushed in, it will lock in the depressed position and. the drive will be write protected. If the drive is writing as the switch is pushed in, FAULT will light. When the switch is pushed
again, releasing it from the depressed state, the drive will no longer be write protected.

1-11

CHAPTER 2
REMOVAL AND REPLACEMENT PROCEDURES

2.1 INTRODUcnON
. This chapter describes the removal and replacement procedures for the various Field Replaceable
Units (FRUs) in the RLOI and RL02 Disk Drives. The flow chart in Figure 2-1 illustrates the sequence
of FRU removal. For example, to remove the spindle, the cartridge access cover must be removed. This
is followed by the field service access cover, the spindle access cover and the belt from the spindle
pulley. The FRUs are generally replaced in reverse order of removal.
The number in each oval of Figure 2-1 is the paragraph that describes the removal and replacement for
that particuiar FRU.
I

Most of the removal and replacement procedures in this chapter contain references to earlier paragraphs. This drive is simple enough that the FE should not have to refer back to these other paragraphs
once he has had some experience on the drive. The flow chart can serve as a quick reminder, if neces=
sary.
2.2 FRONT BEZEL AREA
2.2.1 Front Bezel
To remove the front bezel:
1.

Turn CBl (rear panel) off and extend drive from cabinet.

Locate and remove the four Phillips head screws as shown in Figure 2-2.
CAUTION
When removing the last screw, hold the front bezel
so that the bezel will not strain the front panel
switch cable.
.

Disconnect the front panel board cable. Note the orientation of the colored stripe on the
cable.

To replace the front bezel:
1.

Connect the front panel board cable.

Locate the top mounting holes in the front bezel and align them with the top mounting holes
in the drive frame (Figure 2-2).

Secure the front bezel with the Phillips head screws, finger-tight only.

2-J

CZ-203I

Figure 2-1

Removal and Replacement
Sequence Flow Chart

MOUNTING
SCREWS (4)

FRONT
PANEL
CABLE

FRONT BEZEL
PREFILTER

Figure 2-2

CZ-1OS0

Front Bezel

Slide the drive into the cabinet and align the front bezel for correct side-to-side clearance.

5.'

Extend the drive from the cabinet and tighten the Phillips head screws securely.

Slide the drive back into the cabinet.

2.2.2

Prefilter

To remove the prefilter:
1.

Remove the front bezel (Paragraph 2.2.1).

Remove the prefilter located on the right front side of the drive (Figure 2-2).

2-3

To replace the prefilter:
1.

Install the prefilter in the recess located on the right front side of the drive, directly over the
four air chamber tubes (Figure 2-2).

Replace the front bezel (Paragraph 2.2.1).

2.2.3 Absolute Filter
To remove the absolute filter:
1.

Remove the front bezel (Paragraph 2.2.1).

Locate the two plenum springs and two plenum cover latches as shown in Figure 2-3.

PLENUM
SpRING
(2 PLACES)

NOTE: SPRING MUST BE HELD DOWN
IN POSITION BEFORE INSTALLING LATCH LEVER
CZ-1058

Figure 2-3

Absolute Filter Access

Lift one of the plenum latches. While holding plenum spring, squeeze the latch and remove
latch from bracket.

Remove plenum spring.

Repeat for the other plenum latch and spring.

2-4

The plenum cover may now be removed by pulling the cover forward. This allows access to
the filter (Figure 2-4).

Use a screwdriver (or one of the plenum springs) to pry the left side of the filter out slightly
before moving the right side. The filter can then be removed by rocking it from side to side
until it slides free.

NOTE
Never reinstall a used absolute iIlter.

ABSOLUTE
FILTER

COVER

NOTE: HANDLE ABSOLUTE FILTER
BY ITS OUTSIDE HOUSING ONLY
CZ-1059

Figure 2-4

Absolute Filter

2-5

To replace the absolute filter:
1.

Insert a new absolute filter into the air duct cavity located on the left front side of the drive.
Be sure the filter is firmly seated against its gasket. It may be necessary to use a plenum
spring to pry the filter into place.

Place clear plastic plenum cover over the absolute filter such that the cover seats on the gasket.

Install a plenum spring by inserting its bottom tang into the slot provided and rotating the
spring such that it fits inside the plenum spring latch bracket (Figure 2-3).

While pressing the plenum spring firmly against the plenum cover, insert the plenum latch by
squeezing the latch and placing the latch into the holes of the plenum latch bracket. See
Figure 2-3.

Push the plenum latch into the "locked'~ position.

Repeat the process for the other plenum spring and latch.

Replace the front bezel (Paragraph 2.2.1).

2.2.4 Front Panel Board
To remove the front panel board:
1.

Remove the front bezel (Paragraph 2.2.1).

Locate the screws holding· the front panel board to the front bezel (Figure 2-5) and remove
them.

To replace the front panel board:
1.

Secure the front panel board to the front bezel (Figure 2-5).

Replace the front bezel (Paragraph 2.2.1).

2-6

cz-ooos

Figure 2-5

Front Panel Printed Circuit Board

2-7

2.2.5 Slides
To remove the drive from the slides:
1.

Turn CB 1 off (rear panel) and extend the drive to its second set of stops by releasing the slide
extension release catches on both slides. See Figure 2-6. Remove the I/O cables and unplug
the ac line cord.

Locate and remove the two front screws securing the drive to each slide as shown in Figure 26 (detail).

Locate the locking latch on each drive rail. (See Figure 2-6.) Actuate them by pulling each
latch away from the drive and lifting at the same time to remove the drive from the slides.
WARNING
The drive weighs 34 kg (75 Ib). Use care when lifting the drive.

To replace the drive on the slides:
1.

Extend both slides fully and place the drive onto the slides. Ensure the locking latch engages
the front of each side (Figure 2-6) and that the rear locking tab engages each slide rail.

Secure the front slide screws first, then adjust the slide position to gain access to the rear
screws. See Figure 2-6.

Push the drive into the cabinet and reconnect the ac line cord and I/O cables. Tum CB1
back on.

2.3 ACCFSS COVERS
2.3.1 Field Senice Access Cover
To open the field service access cover:
1.

Tum CB 1 off (rear panel) and extend the drive from the cabinet.

Locate and remove the captive screws in the cover as shown in Figure 2-7.

Lift the cover up slightly and rotate backward. Rest the cover on the rear flange of the baseplate, using the holding bracket (Figure 2-7).

2-8

LOCKING TAB

LOCKING LATCH

SLIDE EXTENSION RELEASE
CATCH

FRONT SLIDE SCREWS

BUMPER

OPERATOR'S CONTROL PANEL

Figure 2-6

Slide Rails

2-9

CARTRIDGE ACCESS COVER
FIELD SERVICE ACCESS COVER

F. S. COVER

MECHANISM

LATCH
SOLENOID
COVER
CZ-<1010

Figure 2-7

Field Service Access Cover

To remove the field service access cover:
1.

Remove all cables connected to the drive logic module (Figure 2-8) noting the orientation of
the colored stripe on each cable.

Lift cover off the holding bracket and set aside.

To replace the field service access cover:
1.

Place the cover on the rear flange of the baseplate (Figure 2-7).

Reconnect all cables to the drive logic module.

2-10

Lift the cover slightly, rotate it forward and place it into position. The cartridge access cover
is held in place by the front edge of the field service access cover.

Tighten the captive screws.

Turn CBl on and slide the drive back into the cabinet.

DRIVE LOGIC _ _.;r.;r---r_ _ __
MODULE

CZ-G011

Figure 2-8

Module Location

2.3.2 Cartridge Access Cover
To remove the cartridge access cover:
1.

Open the field service access cover (paragraph 2.3.1).

Lift the rear part of the cartridge access cover (Figure 2-7) approximately two inches.

Push backwards on the cover latch mechanism. The cover will pop up in front.

Lift cover straight up off the baseplate. The spring-loaded cover arms will snap to the rearward position.

2-11

To replace the cartridge access cover:

2.4

Pull the spring-loaded cover arms forward so that they are parallel to the cover.

Guide the cover arms in the rollers provided on the casting.

Position the cover over the drive baseplate and lower the front edge until it engages the latch
at the top front lip of the drive baseplate.

Lower rear edge to the baseplate.

Close the field service access cover (Paragraph 2.3.1).

BRUSH AREA

2.4.1 Brush Drive
To remove the brush drive:
1.

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Locate the dc servo module (see Figure 2-8 for location).

Remove the four screws securing the plastic template and module to the baseplate.

Lift the module straight up and· place it in the baseplate slots (Figure 2-9).

Locate the brush motor assembly (see Figure 2-10) and remove the Phillips head screws located at the three corners of the assembly.

Detach the brush motor drive cable connector (Figure 2-9).

Lift the brush motor assembly straight up.

To replace the brush drive:
1.

Place the brush motor assembly over its mounting surface and plug in the keyed cable connector.

Insert the brush motor assembly into cavity and secure with three Phillips head screws.

Replace the dc servo module.

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

2-12

-NOTE:
LOCATION OF CONNECTOR
IS IN THE CAVITY UNDER
THE D,C. SERVO MODULE.

CZ-1063

Figure 2-9

DC Servo Module

2-13

POSITIONER
FRONT VIEW:

POSITIONER
RESTRAINING
BRACKET

LATCH
SOLENOID
ACCESS COVER

CZ-2003

Figure 2-10

Exposed Drive Baseplate

2-14

2.4.2 Brush Tips
The brush tips and brush holder arms are replaced as one unit. To remove the arms (and tips):
1.

Remove the brush drive assembly (Paragraph 2.4.2).

Invert brush motor assembly and place on work surface. Remove retaining ring and flatwasher (Figure 2-11).

Carefully lift on brush drive link assembly at end connecting brush holder assembly, then
pivot link assembly out of the way.
CAUTION
Too much force may break the plastic locating dowels.

Slide brush holder off mounting shaft.

To replace the brush arms (and tips):
1.

Slide new brush hoider arms onto mounting shaft (Figure 2-11).

Install flatwasher and retaining ring as shown in Figure 2-11.

Replace brush drive link assembly onto brush holder dowel as shown in Figure 2-11.

Replace the brush drive (Paragraph 2.4.1).

2-15

BRUSH HOLDER ASSY

RETAINING
RING

FLAT WASHER

BRUSH DRIVE
LINK ASSEMBLY

BRUSH HOME
MICROSWITCH

CZ..Q013

Figure 2-11

Exposed Brush Drive Assembly

2-16

2.5

MODULES

2.5.1 AC Servo Module
To remove the ac servo module:
1.

Unplug the ac power cord.

Open the field service access cover (Paragraph 2.3.1).

Locate the ac servo module (Figure 2-8). Remove the cover (Figure 2-12) and disconnect all
the cables.
NOTE
The cover holddown tabs may have to be bent out of
the way in order to lift the module cover.

Unplug all the cables and lift the module out of the drive.

To replace the ac servo module:
1.

Slide the module into place.

Connect all the cables and replace the cover.

Replace the field service access cover (Paragraph 2.3.1).

Replace the ac power cord.

2.5.2 DC Servo Module
To remove the dc servo module:
1.

Unplug the ac power cord.

Open the field service access cover (Paragraph 2.3.1).

Locate the dc servo module (Figure 2-8).

Remove the four screws securing the plastic template and module to the baseplate.

Lift the module and disconnect all the' cables.

To replace the dc servo module:
1.

If the module is Part No. 54-13534, check the jumper configuration (Figure 2-9). For an
RL01 drive, both jumpers should be in. For an RL02, WI should be out. W2 is always in
place. If the module is Part No. 54-11850, it only works on an RLOI and has no jumpers. In
this case, go directly to Step 2.

Connect all cables to the module.

Place the module back into the baseplate.

Lay the plastic template into position on top of the module and secure it with the four screws.

2-17

AC SERVO
MODULE COVER

AC SERVO
MODULE

CZ-Q014

Figure 2-12

AC S ervo Module

2-18

NOTE
If the dc seno module being replaced is the "old"
module (Part No. 54-11850), use the "old" template
(Part No. 74-18588). If the module being replaced is
a "new" module (Part No. 54-13534), it must be
covered with a different template (Part No. 7020826).
5.

Replace the field service access cover (Paragraph 2.3.1).

Replace the ac power cord.

2.5.3 Drive Logic Module
To remove the drive logic module:
1.

Open the field service access cover (Paragraph 2.3.1).

Remove all cables connected to the drive logic module (Figure 2-8). Be sure to note the orientation of the stripe on each cable.

Remove the Phiiiips head-screws.hoiding the module. to.. the cover, and lift oULthemodule.

To replace the drive logic module:
1.

If the module is Part No. 54-12175, it works on an RLOI only. Go directly to Step 2. If the
module is Part No. 54-13531 or 54-14025, check for jumper WI (Figure 2-13). For an RLOI
drive, the jumper should be in place. For an RL02, it should be out.

D
oD

D DOD

E30

E26

E22 E18

D O'o\E21
,D D

E29 E25

E17

UIillllllllrn

~w
0J14M~
J2v

CZ-0701

Figure 2-13

Drive Logic Module W 1 Location
2-19

Replace the module inside the field service access cover and secure the module with the
Phillips head screws.

Reconnect the cables to the module.

Close the field service access cover (Paragraph 2.3.1).

2.5.4

Read/Write Module

To remove the read/write module:
1.

Remove the disk cartridge (if one is in place).
NOTE
The read / write "Assembly" consists of the
read/write module and several parts surrounding the
module. Only the module itself should be replaced. If
the module is ordered by Part No. 54-11844 (RL01)
or Part No. 54-13536 (RLOI or RL02), the assembly will not come with it.

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Locate the read/write moduie assembiy (Figure 2-8). Ii there is a grounding wire connected
to the rear of the assembly, disconnect it.

Lift the assembly up, rotate it toward the dc servo module and rest it on the baseplate locating pins (Figure 2-14).

Disconnect the r /w head cables from the assembly.

2-20

READ/WRITE
MODULE ASSEMBLY

POSITIONER
ASSEMBLY

(A) OLDER RL01
CZ-2OM

Figure

2-14a

Read/Write Module (Upright)
Old Style

2-21

READ/WRITE
~MODULE

ASSEMBLY

"W'I~t---l-- PLUG FOR

LOWER HEAD
\

PLUG FOR
UPPER HEAD

- --=
PLASTIC INSULATING
14--+----- STICKER

IN-LINE
SERVO
CONNECTOR
POSITIONER
ASSEMBLY

CABLES MUST NOT
TOUCH THIS BRACKET
WHEN HEADS ARE
FULLY EXTENDED

'(B) NEWER RL01 AND ANY RL02
CZ-0136

Figure

2-14b

Read/Write Module (Upright)
New Style

2-22

Remove the top cover of the assembly (Figure 2-15) by carefully prying back the four plastic
locking tabs and lifting the cover. This is easily accomplished by prying one tab at a time and
lifting the cover slightly at each corner.

Remove the front piece of the assembly (Figure 2-15).

Remove the module cable.

10.

Slide the module out of the pan (Figure 2-15).

To replace the read/write module:
1.

If the drive is an RLO 1, cut jumper W2 but leave in WI. If the drive is an RL02, cut WI and
leave in W2. See Figure 2-15.

NOTE
If the read/write module is Part. No. 54-11844, it
will not have the jumper. However, it can only be
used on an RLOI.
2.

Siide the module into the pan (Figure 2-15).

Reconnect the cable to the read/write module.

Replace the front piece of the assembly.

Replace the top cover of the assembly by pushing down on the cover until the four plastic
tabs secure the cover.

Reconnect the cables to the assembly (Figure 2-14).

Place the assembly back into the baseplate. If there was a grounding wire connected to the
rear of the assembly, reconnect it.

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

2-23

TOP COVER

FRONT
PIECE

__~~-.
LOCKING

I
I

I LOCKING

I
I
LOCKING
TAB

READIWRITE
MODULE
JUMPERS
LOCKING
TAB
CZ-2055

Figure 2-15

Read/Write Module Box Disassembly

2-24

2.6 SPINDLE AREA
2.6.1 Belt From Spindle Pulley
To remove the belt from the spindle pulley:
1.

Remove the spindle access cover (see Figure 2-16).

Slip belt off the spindle pulley.

To replace the belt on the spindle pulley:
1.

Slide the drive belt on the pulley and rotate the spindle so that the pulley will drag the belt
onto itself.

Replace the spindle access cover.

2.6.2 Spindle Ground Button
To remove the spindle ground button:
1.

Remove the spindle access cover (see Figure 2-16).

Using Figure 2-17 as a guide, pull down on the ground brush strap enough to allow the
ground brush to drop.

To replace the spindle ground button:
1.

Pull down on the ground brush spring just enough to insert the ground brush (Figure 2-17).

Rotate the spindle several times to ensure firm seating and to check that the spindle does not
bind.

Replace the spindle access cover (see Figure 2-16).

2-25

--::::_L-~

~-::.-=:~~~'-

-::.. -:::::- - - :;;--

I
BOTTO M OF DRIVE

~ SPINDLE ACCESS COVER
•

I
CZ-1060

Figure 2-:16. S pindle Access Cover

2-26

BAD

SPINDLE GROUND
BRUSH STRAP

VIEW FROM
ACCESS HOLE

CZ-2029

Figure 2-17 Spindle Ground Button

2-27

2.6.3 Spindle
To remove the spindle:
1.

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Remove the belt from the spindle pulley (Paragraph 2.6.1).

Remove the two screws holding the sector transducer to the spindle (Figure 2-18).

Remove the cable clamp (one screw) holding the sector transducer cable to the spindle (Figure 2-iS).

Lift the spindle straight up out of the baseplate.

To replace the spindle:
1.

Insert the spindle into the baseplate. Position the spindle so that the locating pin fits into the
recess in the spindle assembly.

Secure the spindle to the baseplate with three Phillips head screws.

Replace the belt on the pulley (Paragraph 2.6.1).

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

2.6.4 Sector Transducer
To remove the sector transducer:
1.

Remove the field service access cover (Paragraph 2.2.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Remove the two screws holding the transducer to the spindle (Figure 2-18).

Remove the screw holding the transducer cable clamp to the spindle (Figure 2-18).

Remove the screw holding the transducer ground lug to the baseplate.

Remove the three other cable clamp screws.

Unplug the cable irom the drive logic module, noting the orientation of the stripe on the
cable.

Remove the transducer cable, noting the path of cable routing.

2-28

SCREW
TRANSDUCER

_~ I

---

lOCKWASHER

CZ-l061

Figure 2-:18

Sector Transd ucer Mounting

2-29

To replace the sector transducer:
1.

Route the transducer cable in the drive, following the path of removal.

Replace the three screws in the cable clamps and reinstall into the baseplate.

Replace the screw holding the transducer ground lug to the baseplate (Figure 2-18).

Replace the screw holding the transducer cable clamp to the spindle (Figure 2-18).

Replace the two screws holding the transducer to the spindle (Figure 2-18).

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

2.7 POSITIONER AREA
2.7.1 Positioner
There are two different types of read/write head cable guides. The older one, as shown in Figure 2-14a,
is only on "early" RLO 1 drives. The newer one, shown in Figure 2-14b, is on all RL02 and "later" RLO 1
drives.

NOTE
To determine whether an RLOI is an "early" or
"later" drive, look at the positioner assembly. If
there is no head cable guide on the positioner (Figure 2-14a), it is an older drive. If the head cable
guide is there, it is a newer drive.
If the positioner is being replaced in an early RL01, follow the procedure in Paragraph 2.7.1.1. If the
positioner is being replaced in a later RL01 or an RL02, follow the procedure in Paragraph 2.7.1.2. If
an early RL01 is having intermittent read check errors, the old cable guide (on the read/write module
assembly) may be removed and the new one installed, as described in Paragraph 2.7.1.3. The part number for the kit containing the new cable guide is given in Field Change Order CX-0035.
NOTE
When the positioner (70-12117) is ordered, it will
NOT come with the new head cable guide kit. This
must be ordered separately.
2.7.1.1 Positioner in Early RLOI
To remove the positioner:
1.

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Remove the dc servo module (removal Steps 1 through 4, Paragraph 2.5.2).

Disconnect positioner cable and place the module back into the baseplate.

2-30

Lift up the read/write module assembly, rotate it toward the de servo module and remove the
head cables from the module assembly (Figure 2-14a).

Remove the six screws holding the positioner to the baseplate (Figure 2-19).

Lift the positioner up and out of the drive area.

Remove the read/write heads from the positioner (Paragraph 2.7.2).

THESE 2 SCREWS ARE
NEAREST THE MOTOR
SHAFT AND ARE THE
LONGEST OF THE SIX ~
MOUNTING SCREWS
~

~;r

HEADS HOME SWITCH
ADJUSTING SCREW

(:p

i~-.-__

POSITIONER ADJUSTING
SLOT
.h'

POSITIONER ADJUSTING
SLOT

CZ-1079

Figure 2-119 Positioner Assembly

2-31

To replace the positioner:
1.

Replace the read/write heads on the positioner (Paragraph 2.7.2).

Place the positioner back into the baseplate of the drive.

NOTE
The postioner is fragile. Do not drop it into place.
Lower it gently.
3.

Secure the positioner to the baseplate with the six Phillips head screws (Figure 2-19).

Place the head cables back into the module assembly (Figure 2-14a).

Replace positioner plug onto dc servo module.

Place the read/write module assembly into the baseplate.

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

Perform the positioner radial alignment (Chapter 3, Paragraph 3.6) and the head alignment
(Chapter 3, Paragraph 3.7).

2.7.1.2 Positioner in Newer RLOI and Any RL02
To remove the positioner:
1.

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Remove the dc servo module (removal procedure Steps 1 through 4, Paragraph 2.5.2).

Disconnect positioner cable and place the module back into the baseplate.

Lift up the read/write module assembly, rotate it toward the dc servo module and remove the
head cables from the module assembly (Figure 2-14b).

Place the read/write module assembly on the baseplate locating flanges.

Remove the six screws holding the positioner to the baseplate (Figure 2-19).

Lift the positioner up and out of the drive area.

Remove the head cables from the cable guide assembly.

10.

Remove the read/write heads from the positioner (Paragraph 2.7.2).

11.

Loosen the screw holding the cable guide to the tachometer guide rod and remove the cable
guide assembly (Figure 2-20).

2-32

TACHOMETER COIL COVER

·CZ~133

Figure 2-20 Head Cable Guide
To replace the positioner:
1.

Ensure that the rear screw on the tachometer guide rod is tight (see Figure 2-20).

Replace the head cable guide assembly (Figure 2-14b).

Upon installation of the head cable guide assembly, ensure that the guide rod does not touch
the tachometer coil cover. If the rod does touch the cover, adjust the cable guide assembly.
Check through the full range of carriage travel (Figure 2-20).

Replace the read/write heads on the positioner (Paragraph 2.7.2).

Place the positioner back into the baseplate of the drive.
NOTE
The postioner is fragile. Do not drop it into place.
Lower it gently.

Secure the positioner to the baseplate with the six Phillips head screws (Figure 2-19).

2-33

Replace positioner plug onto dc servo module.

Replace dc servo module (Paragraph 2.5.2).

Place the head cable plugs into the read/write module assembly (Figure 2-14b).

10.

Power up the drive, install a pack in the drive, and load the heads.

11.

Manually move the heads toward the spindle, as far as they will go.

12.

Mount the head cables into the clips on the cable guide. The cable for the lower head should
go into the lower clip (Figure 2-14b).

13.

Ensure that the cables do not touch the corner of the cable guide bracket (as shown in Figure
2-14b). If they do, readjust the cables in the clip so that they do not touch the corner of the
bracket.
NOTE
The positioner MUST be fully extended when performing this check.
NOTE
The read/write module assembly will have to be removed from the baseplate holding flanges and held in
one hand to readjust the cabies, as the cables are not
long enough to reach.

14.

Retract the heads, power down the drive, and remove the pack.

IS.

Place the read/write module assembly into the baseplate.

16.

Replace the cartridge access cover (Paragraph 2.3.2).

17.

Replace the field service access cover (Paragraph 2.3.1).

18.

Perform the Positioner Radial Alignment (Chapter 3, Paragraph 3.6) and the Head Alignment (Chapter 3, Paragraph 3.7).

2.7.1.3 New Head Cable Guide in Older RLOI
To install a new head cable guide:
1.

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Disassemble the read/write module assembly (Paragraph 2.5.4).

Mount the plastic insulating sticker on the drive (Figures 2-14b and 2-21).

Remove the read/write cable clip from the read/write module assembly by removing the
screw. Discard both the screw and the cable clip.

2-34

CZ-0134

Figure 2-~ 1 Location of Plastic Insulating
Sticker
6.

Reassemble the read/write module assembly (Paragraph 2.5.4, replacement Steps 1 through
5).

Power up the drive, install a pack in the drive, and load the heads.

Manually move the heads out toward the spindle, as far as they will go.

Tighten rear screw, loosen front screw (Figure 2-20).

10.

Attach the new head cable guide, with the rod pointing toward the rear of the drive (Figures
2-14b and 2-20).

11.

Ensure that the rod does not touch the tachometer coil cover. If it does, adjust the cable
guide. Check through full range of carriage travel.
2-35

12.

Manually move the heads toward the spindle, as far as they will go.

13.

Mount the head cables into the clips on the cable guide. The cable for the lower head should
go into the lower clip (Figure 2-14b).

14.

Ensure that the cables do not touch the corner of the cable guide bracket (as shown in Figure
2-14b). If they do, readjust the cables in the clip so that they do not touch the comer of the
bracket.
NOTE
The positioner MUST be fully extended when performing this check.
NOTE
The read/write module assembly will have to be removed from the baseplate holding flanges and held in
one hand to readjust the cables, as the cables are not
long enough to reach.

15.

Retract the heads, power down the drive, and remove the pack.

16.

Place the read/write module assembly into the baseplate.

17.

Replace the cartridge access cover (Paragraph 2.3.2).

18.

Replace the field service access cover (Paragraph 2.3.1).

2.7.2 Read/Wri!e Heads
To remove the read/write heads:

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Remove the read/write module assembly (Paragraph 2.5.4).

Disconnect the head cables from the module assembly (Figure 2-14).

Use a 3/32" Allen wrench to loosen the captive head retaining screw and carefully slide the
head forward, out of the positioner assembly (Figure 2-22).
CAUTION
Do not allow the head being removed to bump or
drag on the other head during the procedure.

Repeat for the other head.

2-36

UPPER

HEAD (1;

LOWER HEAD LOCATING PIN

CZ-0728

Figure 2-t22 Read/Write Heads

2-37

To replace the read/write heads:
1.

Insert the lower head into the positioner frame such that:
•

The locating pin (Figure 2-22) is in the recess of the tailstock of the head

•

The tailstock fits into the carriage assembly

•

The corner of the head fits into the plastic extension

Slide the head to the rear of the drive so that the head is up against the locating pin.

Using the 3/32" Allen wrench, snug the hold down screw to secure the head in place.
CAUTION
The screw is being tightened into an aluminum casting. Do not overtighten tbis screw so no damage will
occur to the threads in the casting.

Insert the upper head into the positioner frame, being careful not to strike the lower head.

Secure with the hold down screw.

Reconnect the head cables into the read/write module connectors (Figure 2-14). The lower
head cable (J3) is inserted into the connector to the left of the upper head cable connector.
The J3 connector is the one closer to the rear of the drive.

Replace the read/write module assembly (Par~graph 2.5.4).

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

10.

Perform the read/write head alignment (Paragraph 3.7).

2.8 REAR PANEL AREA
2.8.1 Power Supply
To remove the power supply:
1.

Remove the drive from the slide rails (Paragraph 2.2.5, Steps 1 through 3).

Remove the field service access cover (Paragraph 2.3.1).

Remove the cartridge access cover (Paragraph 2.3.2).

Remove the ac servo module (Paragraph 2.5.1).

Remove the dc servo module (Paragraph 2.5.2, Steps 1 through 4).

Place the dc servo module on its edge in the mounting slots provided (Figure 2-9) "and disconnect cable J1.

2-38

Disconnect brush motor drive cable from its connector (Figure 2-19).

At the rear of the drive, remove the six mounting screws (Figure 2-23).
CAUTION
The power panel assembly will swing out away from
the drive after the last screw is removed. Therefore,
the power supply panel should be held firmly in place
until the last screw is removed.

CABLE "our"
11 0/220 VOLTS
TERMINAL
BLOCK COVER
CIRCUIT BREAKER
CZ-1056

Figure 2-23

Rear View of Drive

To replace the power panel assembly:
1.

Slide the rear panel assembly into the rear of the drive, ensuring that:
•

The top edge of the panel fits under the rear casting flange (see Figure 2-24, callout #1)

•

The bottom edge of the panel fits over the bottom pan of the drive (see Figure 2-24,
callout #2)

While holding the panel firmly, start the two bottom screws so that the panel will be held in
place for the remaining four screws.

2-39

REAR POWER PANEL ASSEMBLY

CZ-Q015

Figure

2-24

Rear Pa nel Assembly

2-40

Reconnect Jl of the dc servo module.

Reconnect the brush motor drive cable (Figure 2-9).

Replace the dc servo module (Paragraph 2.5.2).

Replace the ac servo module (Paragraph 2.5.1).

Replace the cartridge access cover (Paragraph 2.3.2).

Replace the field service access cover (Paragraph 2.3.1).

Replace the drive into the cabinet (Paragraph 2.2.5).

2.8.2 Spindle Drive Belt
To remove the spindle drive belt:
1.

Remove the power supply (Paragraph 2.8.1).

Remove the belt from the spindle pulley (Figure 2-15).

Remove the drive motor tension spring from the -motor housing (Figure 2-25).

Pull belt out through the back of the drive.

To replace the spindle drive belt:
1.

Ensure the drive motor housing is as far forward in the drive as it will go.

Slip belt under housing (around the drive motor pulley) and slide the belt in the direction of
the spindle pulley.

From the access in the bottom of the drive, slip the belt onto the. spindle pulley.

Ensure the belt is still on the motor housing pulley.

Slide drive motor housing as far to the rear of the drive as it will go, and reinstall the tension
spring.

Rotate the spindle several times to position the belt on the self-centering pulleys and check
for binding and/or twists in the belt.

The belt should have proper tension as applied by the tension spring. Figure 2-26 illustrates
the proper belt tension.

Reinstall the power supply panel (Paragraph 2.8.1).

2-41

SPRING (EXTENSION)

SCREW----LOCKWASHER STEEL WASHER __
SPRING WASHEn-_~~
STEEL WASHER-~-.;:jII~
DELRIN WASHER--1:-.....,..

DELRIN WASHER-""'''''=-:;.t

Figure 1-25 Drive Motor Mounting

2-42

SPINDLE
PULLEY

DRIVE
MOTOR
PULLEY

SPINDLE
GROUND BUTTON
SPRING
DRIVE BELTWITH
LIGHT PRESSURE APPLIED

CZ-0016

Figure 2-26

Drive Belt Tension

2.8.3 Power Supply Fan
To remove the power supply fan:
1.

Remove the power supply (Paragraph 2.8.1).

Disconnect the ac plug to the fan.

Remove the four screws and nuts holding the fan in place (Figure 2-27). The bottom two nuts
can be accessed with an open-end wrench or a pair of long-nosed pliers.

To replace the power supply fan:
1.

Place the fan in place with the ac socket located on the top and the airflow direction arrow
pointing to the rear of the assembly.

Reinstall the four screws securing the fan and finger guard.

Reinstall the power supply (Paragraph 2.8.1).

2-43

2.8.4 Circuit Breaker
To remove the circuit breaker:
1.

Remove the power supply (Paragraph 2.8.1).

Locate the circuit breaker (Figure 2-27) and mark the wires going to the four breaker terminals.

Remove the four wires on the breaker assembly.

Squeeze on the four plastic holding tabs (two on the top of the breaker and two on the bottom) to release the breaker from the panel (Figure 2-27).

Slide the breaker out the panel, toward the rear.

CZ'()()17

Figure 2-27 Circuit Breaker

2-44

To replace the circuit breaker:
1.

Slide the breaker into the power supply panel, ensuring that the "OFF" position is down.

Reconnect the wires going to the breaker, as marked when removed.

Reinstall the power supply panel (Paragraph 2.8.1).

2.8.5 Spindle Drhre Motor
To remove the spindle drive motor:
1.

Remove the power supply (Paragraph 2.8.1).

Remove the drive motor tension spring from the motor housing (Figure 2-25).

Remove the two drive motor mounting screws from the standoffs (Figure 2-28).

Figure 2-28 Drive Motor Assembly Technique
2-45

Slide the drive motor housing forward slightly and lift the assembly up approximately onehalf inch.

Drive belt should have fallen off; if not, remove it.

Slide drive motor out of the drive. .

To replace the spindle drive motor:
1.

Check to see if the drive belt is still on the spindle pulley. If not, replace it.

From the back of the drive, pull on the belt to take away the slack.

Slip the belt onto the drive motor pulley.

Using Figure 2-28, reinstall drive motor into the rear of the drive. Note the items listed below.

5.
6.

•

Tab (B) fits under bracket (C)

•

Blower housing mounting pads fit over the standoffs

•

Delrin spacers are still on the standoffs

Check that belt did not come off the motor pulley.
If the belt is still on, check to see if it came off the spindle pulley. If belt is off, replace on the
~~~

Attach the drive motor tension spring to the motor housing (Figure 2-25).

Install mounting hardware on drive motor housing, using Figure 2-25 as a guide.

Pull backward on the drive motor housing to apply tension to the belt. Tension spring should
hold motor in place.

10.

Rotate spindle several times to position belt on the crowned self-centering pulleys.

11.

The belt should have proper tension as applied by the tension spring. Figure 2-26 illustrates
proper belt tension.

12.

Reinstall the power supply panel (Paragraph 2.8.1).

2-46

CHAPTER 3

CHECKS, ADJUSTMENTS AND ALIGNMENTS

3.1 INTRODUCTION
Many of the checks, adjustments and alignments described in this chapter deal with the drive logic
module (DLM). Because there are three different versions of the DLM, it is necessary to first identify
the particular type of module on the drive being serviced. The three versions are shown in Figure 3-1.

T2 T3

• •

VERSION 1

TP1.

TPS

•

TP2
TP7
• ·TP11

TP5

•

TP12

•

•
·TP9

~~
·TP3
J2

J14

54-12175
RL010NLY

®Q

NOTE:
J11 ANDJ4
POINT DOWN

•

TP4

TP12

TP13

TP16
• TP11

•

VERSION 2
~1

T2· •

lP3~J12
tCJTP~ ~ ®~M~r
•• • • • •

TP15-7- 8-10-9

.TP5

54-13531
RL02 OR RL01
W1 IN FOR RL01
W1 OUT FOR RL02

Figure 3-1

TP1·

NOTE:
J4 AND J11 POINT UP
NO TP19 THRU 26

Drive Logic Module Layout Sheet 1 of 2
3-1

• TP21(!)0 TP22
TP12

.
TP4

•

TP2

-TP13
TP16

@ TP19
(!) TP20

• TP11
•

VERSION 3

TP23

T1
TP25 (!)

<!5 TP26

TD'l~'.'"

I'. "'"

.J I ~

•

T3
•

:TP6

@
TP24 ~
R

\fj.:p~ M @~ML I

....

1"+

•

TP5

•

••

TP15.-7- 8-10-9

•

t'I

TP1 t=

NOTE: R DENOTES RED STRIPE
54-14025
RL02 OR RL01
W1 IN FOR RL01
W1 OUT FOR RL02

JUMPER
TEST LUGS
EFFECT
19-20
DEFEAT COVER CLOSED
21-22
SELECT HEAD 1
23-24
DISABLE SKTO
25-26
DEFEAT POS SIG
(THESE TEST LUGS ARE CIRCLED)

NOTE:
J4 AND J11 POINT UP
HAS TP19 THRU 26

DODD

E30 E26

NOTE:
JUMPER W1 MAY BE FOUND
BETWEEN IC LOCATIONS 21 AND
25 AS SHOWN

E22 E18

o0'0·0 0

E29 E25 \E21 E17
Wl
CZ-0018

Figure

3- I Drive Logic Module Layout Sheet 2 of 2

•

Version 1 (Part No. 54-12175) ca-n be identified by the fact that the two Berg connectors in
the lower right hand portion of the module point down, while the other two along the bottom
row point up. This board will only operate in an RLOI.

•

Version 2 (Part No. 54-13531) has all four connectors in the bottom row pointing up, as in
Figure 3-1. This module will function in an RIO 1 or an RL02.

•

Version 3 (Part No. 54-14025) has the same arrangement of Berg connectors as Version 2,
but it also has test lugs (shown in Figure 3-1) that are not on either of the other two modules.

The service jumpers used in these checks and adjustments are listed in Table 3-1.
In the course of performing some of the alignments, it is necessary to select head 1 and then later select
head O. The methods for accomplishing this are shown in Table 3-2.
.
NOTE
If diagnostics are not avallable, toggle in the appropriate program shown in Appendix C.

3-2

Table 3-1 Service Jumpers for
Drive Logic Module
Defeat
Cover
Switch

Defeat
POSSIG

Defeat
SKTO

E33-3 to
E33-7

TP8to
TPI-6

E17-6 to
E17-7

E54-12 to
E54-7

TP6to
TPI-4

EI0-8 to
EI0-7

TPI9 to
TP20

TP6to
TP Logic
Ground
(TPI-TP4)

TP23 to
TP24

Version

Select
Head 1

TP21 to
TP22

Table 3-2 Methods for Selecting Heads
DLM Version 1 or 2

DLM Version 3

PDP-II

Load DZRLCXX or CZRLIXX and
run head alignment routine.
WRITE PROTect switch in =
head I, out = head 0

Jumper TP21 to 22 = head I
No jumper = head 0

PDP-8

Load AJRLBXX or AJRLHXX and
run head alignment routine.
WRITE PROTect switch in =
head I, out = head 0

Same as abOve

3-3

3.2 VOLTAGE CHECKS
The dc servo module template indicates voltage test points. Check the following vol~ages.
Voltage

Limits

+Vun

+14 V to +18 V

-Vun

-14 V to -18 V

+5V

+4.85 V to +5.35 V

+8V

+7.7 V to +8.3 V

-8V

-7.7 V to -8.3 V

The regulators on the dc servo module are not adjustable. If a voltage is out of tolerance, the faulty
FRU should be replaced.
The + 5 V can be killed by a blown pico fuse, a thermal switch on the dc servo heat sink, an overvoltage
crowbar, or a home switch on the positioner not being closed during power up.
3.3 SECTOR TRANSDUCER OUTPUT CHECK
This check verifies a correct output of the sector transducer.

Required Tools:
1.
2.

Oscilloscope with probe
DIP clip.

Check:
1.

Remove both top cover assemblies.

Install cartridge.

Defeat the cover interlock (Table 3-1).

Depress LOAD switch.

While waiting for the heads to load onto the pack, set up the oscilloscope (sync internal
negative-going).

6a.

DLM Version 1: Place oscilloscope probe on E8, pin 8.

6b.

DLM Version 2: Place oscilloscope probe on TPi4.

6c.

DLM Version 3: Place oscilloscope probe on TPI4.

The signal displayed on the oscilloscope should be similar to that shown in Figure 3-2.
The peak output of the negative portion of the waveform should be between O.35Vp and
1.5 Vp.
NOTE
The waveform must be negative-going first.

3-4

+V .

/\
-'_.._ IIII.... 1\
.. .

t
.35V.

lJV

1.5 V.

!", ,

..
~

~
.~

,
,
\

•

~
.~

:~
-~
-~
-~

:~
-~

:~
-I"

TIME = 100 ~SEC/DIV.
VOLTS = 200 MV/DIV.

Figure 3-2

.. 1
.. "J ..

!It..

--'-l
........

OV.

I
\~

-v.
MA-1602

Sector Transducer Output

3.4 SECfOR PUlSE TIMING CHECK
This is a check of the sector pulse width and repetition rate. The repetition rate is a function of spindle
speed.
A.

An oscilloscope with probe is required.

Check:
1.

Remove both top cover assemblies.

Defeat cover interlock (Table 3-1).

Install cartridge.

Depress LOAD switch.

Sa.

Version 1 of DLM: Place the probe on TP9.

5b.

Version 2 of DLM: Place the probe on TPl1.

5c.

Version 3 of DLM: Place the probe on TPl1.

Set the oscilloscope to sync internal, negative-going. The signal display,ed on the oscilloscope should be the same as in Figure 3-3. Sector pulse width should be 62.5 microseconds. Correct disk speed ranges from 594 microseconds to 639 microseconds, with
624 being the desired norm. The sector pulses should be stable at some time period
within that range.

3-5

··
·:
:·
·

... . . .

I
I

~62.5 p,S

...", ..
~

. . .- ... .
I

I-

~
~

625/ls

-I.~

'1-

TIME = 100 /ls/OIV.
VOLTS = 2V/OIV.

Figure 3-3

CZ-l07S

Sector Pulse Timing

3.5 READ SIGNAL AMPLITUDE ADJUSTMENT
This check compares the amplitudes of the read signal from each read/write head against the data in
the engineering specification.
A.

Required Tools:
1.

Oscilloscope with two probes

2a.

One DIP clip, onepin-to-pin jumper and one test lead (alligator clip), or

2b.

Two pin-to-pin jumpers and two DIP clips

Diagnostic listed in Table 3-2.

Check:
1.

Remove both top cover assemblies.

Defeat SKTO, POS SIG and cover interlock (Table 3-1).

Place the read/write module box assembly up and out of the way on the carriage assembly (Figure 3-4).

Install cartridge.

Depress the LOAD switch.

Wait for the heads to load.

Disable the servo drive to the carriage by disconnecting the in-line connector.

3-6

READ/WR.lTE

I ~ MODULE
¥'
ASSE~BLY
PLUG FOR
LOWER HEAD

1IIT'-T1t----L-.-

PLASTIC INSULATING
~-+-__- - STICKER

IN-LINE
SERVO
CONNECTOR
POSITIONER
ASSEMBLY

CABLES MUST NOT
TOUCH THIS BRACKET
WHEN HEADS ARE
FULLY EXTENDED

CZ..()136

Figure 3-4

Positioner and Read/Write Module Box Assembly

Sa.

Version 1 of DLM: Place Channel A probe on TP9 (Sector Time).

, Sb.

Version 2 of DLM: Place Channel A probe on TPll (Sector Time).

Sc.

Version 3 of DLM: Place Channel A probe on TPII (Sector Time).

Place the Channel B oscilloscope probe on TP2 of the read/write module (Servo Data).

10.

Set the oscilloscope to sync internal on Channel A, negative-going, and observe the
waveform shown in Figure 3-5.

11.

Move the positioner forward until the S 1 servo burst loses amplitude and finally disappears. This is the inner guard band area of the disk.

3-7

CHAN. '8

GN D. REF. ~-++++++I-+

CHAN. A

GND. REF.~""-+--+--+--+-""'-""-+-+--.J----1
TIME: 10M ICROSEC/OIV.
CHAN: "A" 500 MILLI VOLTS/OIV.
CHAN: "B" 2 VOLTS/OIV.

Figure 3-5

CZ-1077

Servo Bursts and Sector Pulse

12.

Pull the positioner back slowly until the S 1 servo burst retU!"!lS.

13.

Move the positioner slowly in small amounts to obtain a maximum amplitude from the
S 1 servo burst. At this point the positioner is at the last data track on the disk.

14.

Measure and record the peak-to-peak amplitude of the S 1 burst for both heads. See
Table 3-2 to select the heads.

15.

Adjust the lower of the two amplitudes to 650 millivolts, by rotating the appropriate
potentiometer on the read/write module.
NOTE

On the newer read/write modules, jumper WI is in
when mounted in an RLOI drive. This requires that
potentiometer R41 be adjusted. For RLOl drives,
jumper Wl is in and requires that potentiometer
R40 be adjusted see Figure 3-6.
16.

Select the opposite head. The maximum allowable amplitude should be no greater than
850 millivolts.

17.

If the selected head amplitude is greater than 850 millivolts, then replace the upper
head (0). If the two read/write heads are within specification, then continue with the
next step. If a head was replaced, go back to step 4.

18.

Reposition the carriage to track 0 by moving the positioner toward the rear of the drive
until the 82 servo bursts disappear. This is the outer guard band area of the disk.

19.

Pull the positioner back slowly until the 82 servo burst returns.

3-8

R41
(RL01)

E6 5

5
E9

E4 5
E3 ~

Figure 3-6

®®®

Amplitude Adjustment POT Locations

3-9

El0

20.

Move the positioner slo.wly in small amounts to. obtain a maximum amplitude from the
SI servo. burst. At this point the po.sitio.ner is at track O.

21.

Measure and record the peak-to-peak amplitude o.f S 1 fo.r both heads. See Table 3-2 to
select the heads. The maximum allo.wable amplitude of the S 1 servo. burst while o.n
track 0 is 2.25 V.

22.

If the specificatio.n canno.t be met, replace the cartridge and re-run the check from step
5. If the original cartridge was causing the amplitude specificatio.n to. fail, the new cartridge will allow the amplitude to. pass specification.

23.

If after replacing the o.riginal cartridge with a new cartridge, the amplitude specification still fails, replace the read/write heads one at a time. This procedure shouid be run
from step 4 each time to. check the amplitude specification.

NOTE
If both heads fail to meet the specification, it is p0ssible that the read/write module is bad. Replace the
module (see Chapter 2) and repeat the procedure. If
a head is replaced, it must be aligned (see Paragraph
3.7). The radial alignment must also be checked
(Paragraph 3.6).

3.6 POSITIONER RADIAL ALIGNMENT
This adjustment assures that the servo burst (as read by the read/write heads) occurs in the proper time
relation to. the sector pulses from the cartridge hub. It also. enables the technician to observe how
straight the carriage motion is over the length of travel, and also acts as a check for head skew.
A.

Tools Required:
1.

Oscilloscope with two probes

Two flat-blade screwdrivers

One Phillips head screwdriver

4a.

One DIP clip, one pin-to-pin jumper and one test lead, or

4b.

Two pin-to-pin jumpers and two DIP clips

Diagnostic listed in Table 3-2.

Positioner Alignment Check:
1.

Remo.ve both to.p co.ver assemblies.

Defeat POS SIG, SKTO and cover interlock (Table 3-1).

Place the read/write module box assembly up and out o.f the way of the carriage assembly.

Install cartridge.
3-10

Depress LOAD switch.

Wait for heads to load onto the pack.

Disable servo drive to the carriage by disconnecting the in-line connector (Figure 3-4).

Select head 1 (Table 3-2).

Place the Channel B oscilloscope probe on TP2 (data) of the read/write module and
Channel B ground on TP3.

lOa.

DLM Version 1: Place Channel A probe on TP9 (SEC TIME) and Channel A ground
on any signal ground (TP1-TP4).

lOb.

DLM Version 2: Place Channel A probe on TP11 (SEC TIME) and Channel A ground
on any signal ground (TP1-TP4).

10c.

DLM Version 3: Place Channel A probe on TP11 (SEC TIME) and Channel A ground
on any signal ground (TP1-TP4).

11.

Set the oscilloscoPe to sync internal, negative-going on Channel A and observe the
waveform shown in Figure 3-5.

NOTE
Sl and S2 seno bursts may not appear in the positive / negative proportions shown in Figure 3-5, depending upon which track the head is centered on.
12.

Measure the time between the negative-going edge of the sector pulse and the beginning
of the Sl servo burst when the positioner is at cylinder O. Record this value.

13.

Select head 0 (Table 3-2).

14.

Repeat Step 12 for head o. Record this value.

15.

If the difference between these two values is greater than six microseconds, replace
head 0 (see Chapter 2) and go back to Step 14. If either of the two values falls outside
of the 15 ± 3 microsecond specification, perform the alignment procedure (Part C below. Otherwise, continue.

16.

Manually move the carriage to the last data track (track 255 on an RLOI or track 511
on an RL02). As head 0 enters the inner guard band, S 1 disappears. Move the positioner back until S 1 appears.

17.

Measure the time between the negative-going edge of the sector pulse and the beginning
of the Sl servo burst when the positioner is at the last cylinder. It should be 15 ± 3
microseconds. If so, the check is complete. Otherwise perform the adjustment (Part C)
below.

3-11

Positioner Alignment
1.

Using Figure 3-7 as a guide, locate the six largest Phillips screws on the positioner baseplate.

Loosen (but do not remove) the six screws holding down the positioner.

Take the two flat-blade screwdrivers and insert them into the adjusting slots on the positioner.

Move the positioner assembly against the right hand side of the drive (toward the
read/write module).

Manually move the carriage to its approximate center of travel.

Using the two flat-blade screwdrivers in the adjusting slots, slide the positioner baseplate until the 15 ± 3 microsecond specification between the fall of the sector pulse and
the rise of the 81 servo burst can be met. (See Figure 3-5.)

NOTE
Equal pressure must be exerted on the screwdrivers
when sliding the positioner to ensure that the baseplate is kept straight.
If positioner resists movement, remove sector trans..
ducer cable from positioner. Don't forget to replace
it when adjustment is complete.

Tighten the six retaining screws in small increments.

Check the 15 ± 3 microseconds specification for head 0 at track 0 and the last track. If
the head is within the specification, the check is complete. Otherwise, repeat the adjustment (Part C) above.

3-12

THESE 2 SCREWS ARE
NEAREST THE MOTOR
SHAFT AND ARE THE
LONGEST OF TH~ SIX
MOUNTING SCREWS

POSITIONER ADJUSTING
SLOT

CZ-1079

Figure 3-7

Positioner Assembly

3-13

3.7 HEAD ALIGNMENT
This procedure will ensure that the two heads are in line with each other to cut down on the servo
tracking time when switching heads.
NOTE
The Read Signal Gain Adjustment (Paragraph 3.5)
and the Positioner Radial Alignment (Paragraph
3.6) should be performed before attempting Head
Alignment.

Required Tools:
1.

Oscilloscope with one probe

3/32" Allen wrench

Flat-blade screwdriver

4a.

One DIP clip, one pin-to-pin jumper and one test lead (alligator clip), or

4b.

Two pin-to-pin jumpers and two DIP clips

Diagnostic listed in Table 3-2.
NOTE
No alignment cartridge is required.

Alignment Check:
1.

Remove both top cover assemblies.

Defeat SKTO and POS SIG (Table 3-1).
NOTE
These jumpers enable the diagnostic routine to work
by disabling the Seek Timeout Error.

Defeat cover interlock (Table 3-1).

Place the read/write module box assembly up and out of the way of the carriage assembly.

Install cartridge.

Depress the LOAD switch.

Wait for the heads to load onto the pack.

Disable servo drive to the carriage by disconnecting the servo in-line connector (Figure
3-4).

Select head 1 (Table 3-2).

3-14

10.

Place the Channel A oscilloscope probe on one of the following test points.
•
•

DLM version 1: Ell pin 7
DLM versions 2 and 3: TP15

The probe ground lead should be on a test point ground of the DLM (TPI-TP4).
Set the vertical gain to 1 volt per division. Set oscilloscope horizontal circuit to free run
(unsynced). The horizontal sweep rate is not important.
11.

Manually move the positioner back to the head loading ramp and then forward toward
the center of the disk while watching the READY indicator and the oscilloscope presentation of the position signal. These two indicate the position of the head relative to the
tracks written on the surface.
When the head is over the head loading zone (outside the outer guard band) the position
signal floats slowly toward + 8 V and the READY indicator is on. When the head is
over the outer guard band the position signal is at a maximum negative voltage (about
-1.5 V) and the READY indicator is off. As the head approaches cylinder 0, the position signal starts to move up toward 0 V and the READY indicator turns on.
As the positioner continues to move forward, the READY Indicator remains on and the
position signal is 0 V when the head is directly over the center of cylinder o. The position signal continues to move in the positive direction· as the head passes cylinder 0 and
reaches its maximum normal value of about + 1.5 V as the head is halfway between
cylinder 0 and cylin(ler 1. The position signal then starts to move down as cylinder 1 is
approached and is at 0 V when the head is over cylinder 1. If cylinder 1 is overshot, the
position signal goes negative, then back to 0 V over cylinder 2, and so on.

By observing the oscilloscope and READY indicator, it is possible to locate cylinder 0
·by moving the positioner into the ollter guard band (position signal is negative and the
READY indicator is off), and then moving the positioner forward to cylinder 0 (position
signal rises to 0 V and the READY indicator turns on). The verification process is to
move the positioner in reverse and observe the the position signal go negative as the
READY indicator goes off and see the position signal stay negative as the head moves
over the outer guard band.
12.

Position head 1 directly over cylinder o.

13.

Hold the positioner still and select head o.

14.

If the position signal is within 0.5 V of 0 V, then verify that head 0 is over cylinder o. If
both of these criteria are met,the head alignment is satisfactory. Be sure to reconnect
the in-line servo connector before unloading the heads. The head alignment check is
complete. Go on to the next check.
If either of these criteria is not met, go to Step 15.

15.

If the position signal was not within 0.5 V of ground or head 0 was over a cylinder other
than 0, perform the head alignment procedure as outlined in paragraph C that follows.

3-15

Head Alignment Procedure

Move the positioner all the way back to the home position so that the heads are up o~
the ramp. Loosen the mounting screw for head 0 and move head 0 all the way back to its
extreme position against the stop.

Select head 1.

Move the positioner so that head 1 is directly over cylinder O.

Select head o.

Hold the positioner still while sliding head 0 forward by twisting a screwdriver between
the end of the head assembly and the stop. Observe the READY indicator and the position signal and move head 0 until it is over cylinder o.

Select head 1.

Verify that head 1 position signal is within 0.5 V of 0 V and that head 1 is still over
cylinder o. If these two criteria are not met, repeat the procedure.

Snug the mounting screw for head 0 while the heads are over the surface. Move the
positioner to its home position before tightening the mounting screw. Do not overtighten
the screw.
NOTE
If the retaining screw is overtightened, the threads
on the alumimum frame may be damaged.

Verify that tightening the mounting screw did not change the alignment enough to make
it unsatisfactory. To do this, select head 1, move it over cylinder 0, select head 0, and
verify that it too is over cylinder 0 and within 0.5 V. If these specifications cannot be
met, repeat the procedure. Otherwise, continue with Step 10.

10.

If the head cable clips are on the read/write module box, replace the head cables in the
clips, and go to Step 14.

11.

Manually move the heads toward the spindle, as far as they will go.

12.

Mount the head cables into the clips on the cable guide. The cable for the lower head
should go into the lower clip.
.

13.

Ensure that the cables do not touch the corner of the cable guide bracket (as shown in
Figure 3-4). If they do, readjust the cables in the clips so that they do not touch the
comer of the bracket.

NOTE
The positioner MUST be fully extended when performing this check.

3-16

NOTE
The read/write module box assembly will have to be
removed from the baseplate holding flanges and held
in one had to readjust the cables, as the cables are
not long enough to reach.

14.

Replace the servo in-line connector to unload the heads. At this point, the procedure is
finished.

3.8 SPINDLE RUNOUT CHECK
Excessive runout in the spindle assembly or cartridge can cause severe tracking problems for the positioning system. This check will determine whether:
1.
2.
3.

Runout exists or does not exist
Runout is in the cartridge
Runout is in the spindle.

Required Tools:
1.
2.
3.
4.

Oscilloscope with probe and ground leads
DIP clip
Jumper
Several test cartridges

Runout Check:
1.

Remove both top cover assemblies.

Place the read/write module box assembly up and out of the way of the carriage assembly.

Defeat cover interlock (Table 3-1).

Install cartridge.

Depress LOAD switch.

Wait for heads to load onto the pack.

Disable servo drive to the carriage by disconnecting the in-line connector (Figure 3-4).

8a.

DLM Version 1: Place Channel A oscilloscope probe on Ell pin 7 (Position Signal) and
place Channel A ground on TP7 (Integrator Ground).

8b.

DLM Version 2: Place Channel A oscilloscope probe on TP15 (Position Signal) and
place Channel A ground on TP5 (Integrator Ground).

8c.

DLM Version 3: Place Channel A oscilloscope probe on TP15 (Position Signal) and
place Channel A ground on TP5 (Integrator Ground).

Set the oscilloscope to sync internal, negative-going and observe the position signal
waveform shown in Figure 3-&.

3-17

POSITION SIGNAL

I IIIIIIIIII
TIME =' 5MS/CM
VOLTS = 200MV/DIV.

Figure 3-8

CZ-1068

Position Signal

10.

The amplitude of the runout should be no greater than 350 millivolts.

11.

If the specification cannot be met, runout exists and another cartridge is needed to determine if the runout exists in the cartridge or the spindle.

12.

To confirm a seating problem, re-seat the cartridge and repeat the runout check. If the
runout is within specificatioll, the problem has been solved. If the runout is still out of
specification, continue with Step 13.

13.

Spindle and cartridge are still suspect, so install a second cartridge and repeat check. If
runout is now within the specification, the first cartridge is bad. If the runout check fails
once more, assume that the spindle bearings are bad and replace the spindle assembly.

3.9 POSITION SIGNAL GAIN CHECK
Insufficient amplitude of the position signal could result in the carriage not being able to hold itself on
track, resulting in read errors and possible seek errors. Too high an amplitude could result in a jitter
which, in tum, emits a vibrating-type noise from the carriage that may generate seek timeout errors.
A.

Required Tools:
1.

Oscilloscope with probe and ground leads
One DIP clip, one pin-to-pin jumper.

Gain Check:
1.

Remove both top cover assemblies.

Place the read/write module box assembly up and out of the way of the carriage assembly.

3-18

Defeat cover interlock (Table 3-1).

Install cartridge.

Depress LOAD switch.

Wait for heads to load onto the pack.

Disable servo drive to the carriage by disconnecting the in-line connector (Figure 3-4).

Sa.

DLM Version 1: Place Channel A oscilloscope probe on E 11 pin 7 (Position Signal) and
place Channel A ground on TP7 (Integrator Ground).

Sb.

DLM Version 2: Place Channel A oscilloscope probe on TP15 (Position Signal) and
place Channel A ground on TP5 (Integrator Ground).

Sc.

DLM Version 3: Place Channel A oscilloscope probe on TP15 (Position Signal) and
place Channel A ground on TP5 (Integrator Ground).

Observe the position signal gain waveform as shown in Figure 3-.9 (a) while manually
moving the carriage back and forth.'

.
• ,,

(A)

,.,, ,-, , ,
• •
t
:.
~ • , :
•
•
,•
•
~
• • • • ••
.
•
,
. ~
,
,
t'
, .
•
~
t
•
.:
• ,
,
·
~
•, •
•l.•• ••
•'.-.••••
• •
",

GND. REF.

POSITION SIGNAL

:'~

· ....
.
II• ••

TIME = 5 MSlDIV.
VOLTS = 1 VOLT/DIV.

(B)

(SMOOTH SINUSOID)

(C)

(REPLACE HEAD)
CZ-1069

Figure 3-9

Position Signal Gain Check Waveforms

3-19

10.

Measure the peak-to-peak deviation of the position signal amplitude about the ground
reference. It should be 3.7 ± 0.7 volts.

NOTE

11.

If these amplitudes are not within tolerance, the
head load operation would most likely fault.

Look at the seno data waveforms at TP2 of the
read/write module for a smooth sinusoidal
waveform, as in Figure 3-9(b). If something like
Figure 3-9(c) is seen, the head azimuth angle is
wrong. In this case, replace the read/write
head.

If the head azimuth is good, then check to see if
the ± 8 Vdc voltages are out of tolerance
(Paragraph 3.2).

Repeat procedure for other read/write head.

3.10 TACHOMETER AC NOISE PICK-UP CHECK
This procedure checks the amount of noise being picked up by the tachometer. If the noise is excessive,
the positioner will have a hard time holding onto a track signal. In this case, the READY light "may
flicker.
A.

Required Tools:
1.
2.
3.

Oscilloscope with probe and ground leads
DIP clip
Jumper.

Check:
1.

Remove both top cover assemblies.

Place the read/write module up and out of the way of the carriage assembly.

Defeat cover interlock (Table 3-1).

Install cartridge.

Depress LOAD switch.

Wait for heads to load onto the pack.

Disable servo drive to the carriage by disconnecting the in-line connector (Figure 3-4).

Set the oscilloscope (sync internally) as follows:
a.

Channel A probe should be on TPI of the dc servo module (summing amp).

Channel A ground should be on TPll of the dc servo module (signal ground).

3-20

Each drive's summing amplifier output at this point will look slightly different, but it
should be similar to the waveform shown in Figure 3-10.

SUMMING AMPLIFIER OUTPUT

TIME =10MS/DIV.
VOLTS = 50MV/DIV.

CZ-1070

Figure 3-10 Summing Amplifier Output
10.

The signal seen should have a peak-to-peak value of no more than 350 millivolts.

11.

If the signal is out of tolerance, the dc servo module could be bad or the drive motor
may be too noisy. Replace the module, and if that does not solve the problem, replace
the drive motor (see Chapter 2).

3.11 VELOCITY PROFILE CHECK
By causing the positioner to perform an oscillating seek, the velocity profile can be checked for duration, amplitude and waveshape.
A.

Required Tools:
1.
2.
3.
4.

Oscilloscope with probe and ground leads
Toggle-in oscillating seek program (Appendix C)
DIP clip
Jumper.

Check:
1.

Remove both top cover assemblies.

Install cartridge.

Defeat top cover interlock (Table 3-1).

Depress LOAD switch.

3-2 )

Wait for heads to load onto the pack.

.Using the oscillating program shown in Appendix C, cause an oscillating seek from
track 0 to track 255 (RLOl) or track 511 (RL02).

7a.

Version 1 of DLM: Place the Channel A oscilloscope probe on TP12, place the Channel
A ground on any of the DLM ground points (TPI through TP6 are ground) and place
the external trigger on E38 pin 12 (SIGN FWD).

7b.

Version 2 of DLM: Place the Channel A oscilloscope probe on TP8, place Channel A
ground on any of the DLM ground test points (TP1 through TP4 are ground) and place
the external trigger on E25 pin 12 (SIGN FWD)=

7c.

Version 3 of DLM: Place the Channel A oscilloscope probe on TP8, place the Channel
A ground on any of the DLM ground points (TPI through TP4 are ground) and place
the external trigger on E25 pin 12 (SIGN FWD).

Set the oscilloscope to sync internal, positive-going and observe the tachometer output
wa veform as shown in Figure 3-11.

1- 4.6 TO
5.0 V

iJ_ -

TACHOMETER OUTPUT VELOCITY SIGf\JAL

·.

1.
a a.

··.

\ \. ....:~
. "..
•I . ~\
.~

• L .•• I_I

I
I

.,'

u ••

•

4.6 TO
5.0 V 4 - 80 TO 86 MS-

~ :~
.~

.~
.~
.~

a"
'1

•
•

• 1 ••

11.1

• I I.L

•

"'""

~
~
~

TIME = 20 MS/DIV.
VOLTS = 2V/DIV.

Figure 3-11

CZ-1071

Tachometer Output Velocity Signal

The peak amplitude of the waveform should be between 4.6 and 5.0 volts.

10.

The maximum seek time should be between 80 and 86 milliseconds.

11.

Observe the trailing edge of the waveform (as indicated by an asterisk In Figure 3-11).
There should be a slight "stepping" slope. If the observed slope has spikes in it, the
positioner needs replacing as it is not rolling smoothly.

12.

If the other specifications (in Steps 9 and 10) cannot be met, the dc servo mOdule is
probably at fault.

3-22

3.12 SERVO DRIVE MOTOR CURRENT CHECK
One possible cause of seek errors is excessive drive motor current. This check will determine if there is
too much current.
A.

Required Tools:
1.
2.
3.
4.

Oscilloscope with probes and ground leads
Toggle in oscillating seek program (Appendix C)
DIP clip
Jumper.

Check:
1.

Remove both top cover assemblies.

Defeat top cover interlock (Table 3-1).

Install cartridge.

Depress LOAD switch.

Wait for heads to load onto the pack.

Using the oscillating seek program listed in Appendix C, cause an oscillating seek from
track 0 to track 255 (RLOl) or track 511 (RL02).

Place Channel A oscilloscope probe on TP3 of the dc servo module.

8a.

DLM Version 1: Place the external trigger on E38 pin 12 (SIGN FWD).

8b.

DLM Version 2: Place the external trigger on E25 pin 12 (SIGN FWD).

8c.

DLM Version 3: Place the external trigger on E25 pin 12 (SIGN FWD).

Observe the motor current waveform as shown in Figure 3-12.

10.

Measure the points called out in the figure and compare them to the following:
#1 should be between 750 and 780 mv.
#2 and #3 are the midpoints of the waveform and should be less than or equal to 500
mv.

11.

Failure to meet specifications requires replacement of the positioner/drive motor assembly (described in Chapter 2).

3-23

GND.REF. H+H+~~Ha

TIME = 20MS/DIV.
VOLTS = 500MV/DIV.

Figure 3-12

CZ-1072

Positioner Motor Current Check

3.13 ACCESS TIME CHECK
The access time is checked by performing oscillating seeks and observing the position signal and "ready
to read/write".
A.

Required Tools:
1.
2.
3.
4.

Oscilloscope with probes and ground leads
Toggle-in oscillating seek program (Appendix C)
DIP clip
Jumper.

Check:
1.

Remove . both top cover assemblies.

Defeat the top cover interlock (Table 3-1).

Install cartridge.

Depress LOAD switch.

Wait for heads to load onto the pack.

Using the oscillating seek program shown in Appendix C, issue a one track seek.

7a.

Version 1 of DLM: Place Channel A oscilloscope probe on E25 pin 12 (ready to
read/write).

7b.

Version 2 of DLM: Place Channel A oscilloscope probe on TP16 (ready to rea~/write).

7c.

Version 3 of DLM: Place Channel A oscilloscope probe on TP16 (ready to read/write).

3-24

Observe the access time waveform as depicted in Figure 3-13.

:~
-~
~

-~
-~

( 17MS

~---

•

-I-

",/

/ J J

I.:~

III I

I II

-I01-

.::

--~

-I.~

TIME=2 MS/DIV
VOLTS=2-V/DIV

Figure 3-13

CZ-2083

Access Time Check (One Track Seek)

Measure the time the "ready to read/write" signal is low. It should be less than or equal
to 17 milliseconds.

10.

Issue a seek from track 0 to track 85 (RLOl) or track 170 (RL02) and check to see that
"ready to read/write" is low for slightly less than 55 milliseconds. See Figure 3-14.

:
:~

(55 MS
1'1

.,.

-...-~

. :.
-.".

. ... . ..

• ,

-:~

----

TIME= 1OMS/DIV
VOLTS=2V/DIV

Figure 3-14

CZ-2OM

Access Time Check (85 Track Seek)
3-25

11.

Issue a seek from track 0 to track 255 (RLOl) or track 511 (RL02) and check to see
that "ready to read/write" is low for slightly less than 100 milliseconds. See Figure 315.

12.

If the specifications are not met, the DLM could be at fault, or the positioner itself may
be binding due to excessive friction. (See Paragraph 3-12.)

I I I I III I I I I
I

(100 MS
0

---

---~

:1=
~
~

-l-

I-l-

I-

TIME=20 MS/DIV
VOLTS=2 V/DIV

Figure 3-15

CZ-2065

Access Time Check (255 Track Seek)

3-26

APPENDIX A
REGISTER SUMMARY

A.I

PROGRAM ACCESSIBLE REGISTERS FOR II-FAMILY CONTROLLERS

Table A-I Subsystem Registers Overview
Address
(octal)

Type
(read/write)

774400

R/W

Control Status (CS)

Indicates drive ready condition; decodes drive
commands and provides overall control functions and error indications.

774402

R/W

Bus Address (BA)

Indicates memory location involved in data
transfer during a normal read or write operation.

774404

R/W

Disk Address (DA)

(1) Holds disk address during a data transfer
such as read or write; or (2) holds the drive
command word for a seek command; or (3)
holds the drive command word for a get status
command

774406

R/W

Multipurpose (MP)

(1) Functions as word counter when transferring read/write data between UNIBUS and
drives; or (2) acts as storage buffer when reading drive status; or (3) stores header information from controller silo when executing a read
header command.

1777410

R/W

Bus Address
Extension (BAE)

Basic Function

Contains the upper six bits of the extended bus
address for 22-bit addressing (Bits 16:21).

A-I

A..I.I

Table A-2 Control Status Register Bit .Description
CONTROL STATUS REGISTER (CSR)
07

ERR

DS1

DSO CRDY

05-

BA17 BA16

DRDY

~~___________"
_----------~A~--------------__
""'"""__--------------=-~~
READIWRITE

READ ONLY

READ
ONLY

CZ-2009

Bit(s)

Description

Drive Ready (DRDY) - Whe~ set, this bit indicates that the selected drive is ready to receive a command. The bit is cleared when a seek or head select operation is initiated and set
when the operation is completed.

1-3

Function Code - These bits are set by software to indicate the command to be executed.

4-5

Command

F2-FO

No Op (RL11) or
Maintenance Mode
. (RLV11jRLV12)

000

Write Check

001

Get Status

010

Seek

011

Read Header

100

Write Data

101

Read Data

110

Read Data without
Header Check

111

Bus Address Extension Bits (BAt6, BAt7) - These are the two most significant bus address
bits when operating in IS-bit addressing modes. They are read and written as data bits 4
and 5 of the cs register but considered as address bits 16 and 17 of the bus address register
(see Paragraph 4.2.2).

A-2

Table A-l Control Status Register Bit Description (Cont)
Bit(s)

Description

Interrupt Enable (IE) - When this bit is set by software, the controller is allowed to interrupt the processor at the normal command or error termination.

Controller Ready (CRDY) - When cleared by software, this bit indicates that the command
code in bits 1-3 is to be executed (negative GO bit). The hardware sets this bit to indicate
the controller is ready to accept another command.

8-9

Drive Select (DSO, DSlj - fhese bits determine which drive will communicate with the'
controller via the drive bus.

10-13

Error Code

Error Name

E3-EO

Operation Incomplete
(OPI)

0001

Read Data CRC
(DCRC or Write Check
Error (WCE)

0010

Header CRC (HCRC)

0011

Data Late (DLT)

0100

Header Not Found
(HNF)

0101

Non-Existant Memory
(NXM)

1000

Memory Parity Error
(MPE) RLV12 only

1001

Drive Error (DE) - This bit is tied directly to the DE interface line. When set, it indicates
that the selected drive has flagged an error. (The source of the error can be determined by
executing a get status command and then executing an MPR read.)
DE can be cleared by executing a get status command with bit 3 of the DA register set.

Composite Error (ERR) - When set, this bit indicates that one or more of the error bits (bits
10-14) is set. If the IE bit (bit 6 of CS) is set and an error occurs (which sets bit 7), an
interrupt will be initiated.

A-3

Table A-3 Bus Address Register Bit Description
BUS ADDRESS REGISTER (BAR)

BA15 BA14 BA13 BA12 BA 11 BA10
~~

BAS

BA7

BA6

BAS

BA4

BA3

BA2

£:sA 1

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _- J

READIWRITE

CZ-2035

Bit(s)

Name

FUi.ction

0-15

BAO thru BA15

These bits point to the UNIBUS address that data is to be transferred to/from. Normally a memory address, BA16 and BA17
are in the CSR bits 4 and 5.

Table A-4 Disk Address Register Bit Description for Seek
Commands
DAR DURING SEEK COMMAND

07·

DFS

DF7

DF6

DF5

DF4

DF3

DF2

DF1

DFO

DIR

1
CZ-2010

Bit(s)

Description

Marker Bit - Must be a one.

Seek - Must be a zero, indicating to the drive that a seek is being requested. With this bit
cleared, the drive uses the remaining contents of the register as seek parameters.

Direction (DIR) - This bit indicates the direction in which a seek is to take place. When the
bit is set, the heads move toward the spindle (to a higher cylinder address). When the bit is
cleared, the heads move away from the spindle (to a lower cylinder address). The actual
distance moved depends on the cylinder address difference (bits 7-15).

Must be a zero.

Head Select (HS) - Indicates which head (disk surface) is to be selected. A one selects the
lower head; a zero, the upper head.

5-6

Reserved.

7-15

Cylinder Address Difference DF 08:00 - Indicates the number of cylinders the heqds are to
move on a seek.

A-4

Table A-5 Disk Address Register Bit Description for
Data Transfer Commands
DAR DURING READING OR WRITING DATA COMMANDS
15

CA8

CA7

CA6

CA5

CA4

CA3

CA2

CA1

CAO

SA5

SA4

SA3

SA2

SA1

SAO
CZ-2011

Bit(s)

Description

0-5

Sector Address SA 05:00 - Desired address of one of the 40 sectors on a track as supplied
QY the software (range is 0 through 47, octal).

Head Select (HS) - Desired head address of one of the two drive heads. A one indicates the
lower head; a zero, the uppei head.

7-15

Cylinder Address CA 08:00 - Desired address of one of the cylinders on the disk (range is 0
through 777, octal). The RL01 has 256 cylinders and the RL02 has 512 cylinders.

Table A-6 Disk Address Register Bit Description for
Get Status Commands
DAR DURING GET STATUS COMMAND
15

RST

0
CZ-2037

Bit(s)

Description

Marker Bit - Must be a one.
Get Status (GS) - Must be a one, indicating to the drive that the status word is being requested. At the completion of the get status command, the drive status word is read into the
controller mUltipurpose (MP) register. With this bit set, the drive ignores bits 8-15.

Must be a zero.

Reset (RST) - When this bit is set, the drive clears its error register (resets all drive faults)
before sending the status word to the controller.

4-7

Must be a zero.

8-15

Not used during a get status.

A-5

Table A-7 MP Register Bit Description for Get Status Commands
MPR AFTER GET STATUS COMMAND
14

WOE CHE

SKTO SPE

WGE

OSE

STC

STB

STA

CZ·2012

Bit(s)

Description

0-2

Major State Code (ST C:A) - These bits define the state of the drive.
STC

STB

STA

0
0
0
0

0
0

1
1

0
0

0
i
0

1
1
1

1
1

Load cartridge
Spin-up
Brush cycle
Load heads
Seek
Lock on
Unload heads
Spin-down

1
1

Brush Home (BH) - Set when the brushes are home.

Heads Out (HO) - Set when the heads are over the disk.

Cover Open (CO) - Set when the drive access cover is open or the dust cover is not in place.

Head Select (HS) - Indicates the currently selected head. A zero indicates the upper head;
a one, the lower head.

Drive Type (DT) - A zero indicates an RLO 1; a one, an RL02.

Drive-Select Error (DSE) - Set when a multiple drive selection is detected.

Volume Check (VC) - Set during transition from a head load state to a head-on-track state.
Cleared by execution of a get status command with bit 3 asserted.

Write Gate Error (WGE) - Sets when write gate is asserted and one or more of the following conditions exist.
•
•
•
•

Drive is not "ready to read/write"
Drive is write-protected
Sector pulse is occurring
Drive has another error

A-6

Table A-7 MP Register Bit Description for Get Status
Commands (Cont)
Bit(s)

Description

Spin Error (SPE) - Set when spindle has not reached speed in the required time during
spin-up or when spindle speed is too high.

Seek Time Ol~t (SKTO) - Set when the heads do not come on-track in the required time
during a seek command or when "ready to read/write" is lost while the drive is in position
(lock-on) mode.

Write Lock (WL) - Set when the drive is write protected.

Current Head Error (CHE) - Set if write current is detected in the heads when write gate is
not asserted (reading).

Write Data Error (WDE) - Set if write gate is asserted but no transitions are being detected on the write data line.

Table A-8 MP Register Bit Description for Read Header Commands
MPR AFTER READ HEADER COMMAND
10
12
11
15
14
13

CAS

CA7

CA6

CA5

CA4

CA3

CA2

CA1

CAO

SA5

SA4

SA3

SA2

SA1

SAO

ZEROES

CRC

CZ-2013

Bit(s)

Description

0-5

SA 0:5 - Sector Address

HS - Head Select

7-15

CA 0:8 - Cylinder Address

A-7

Table A-9 MP Register Bit Description for Data Transfer
Commands
MPR DURING READIWRITE COMMANDS FOR WORD COUNT
12
11
14
13
15
10
09
08
07
06
05
1

WC12 WCll WC10 WC9

WC8

WC7

WC6

WC5

WC4

WC3

WC2

WCl

WCO

CZ-2036

Bit(s)

Description

0-12

Word Count WC 12:00 - Contains the two's complement of total number of words to oe
transferred.

13-15

Must be ones.

Multipurpose Register Programming Note - The
RLOIjRL02 Disk Drive will not do spiral
read / writes~ If data is to be transferred past the end
of the last sector of a track, it is necessary to break
up the operation into the following steps.

A.t.2

Program the data transfer to terminate at the
end of the last sector of the track.

Program a seek to the next track. This can be
either a head sWitch to the other surface but
same cylinder or a head switch and move to the
next cylinder.

Program the data transfer to continue at the
start of the first sector at the next track.

CSR Error Code Defmitions

A.t.2.1 Operation Incomplete (OPI)
This error is flagged by the setting of bit 10 of the CSR. When bit lOis set and 11 through 13 are clear,
the indication is that the current command being executed did not complete within the OPI timer period. For an RLll, this timer period is 200 ms. For the RLVII controller, the period is 490 ms. The
RL V 12 controller timer is set for 550 ms.
A.I.2.2 Data CRC (DCRC) or Write Check (WCE)
This error is flagged by the setting of bit 11 of the CSR. When bit 11 is set and bit lOis clear, the
indication is either that a CRC error has occurred when reading data or that a write check error has
occurred. If the function currently being executed is a write check command, then the probabilities are
that the error is a WCE. If the function being executed is a read data command, then the error is a
DCRC. A write data command cannot flag either of these errors.

A-8

A.I.2.3 Header CRC (HeRC)
This error is flagged by the setting of bit 11 of the CSR. When bit 11 is set and bit lOis also set, the
indication is that a CRC error has occurred when reading a header. This error can set during write data
or read data commands.
A.I.2.4 Data Late (DLT)
This error is flagged by the setting of bit 12 of the CSR. When bit 12 is set and bit 10 is clear, the
indication depends upon the command being executed.
•

Write Data Command - The silo, or FIFO buffer, in the controller emptied before the word
counter overflowed. This means that the command is not finished but the buffer contains no
more words to write. When this happens the DMA cycles are too slow.

•

Read Data Command - The silo, or FIFO buffer, in the controller is full and there are m(\re
words to read from the disk. When this happens, the DMA cycles are too slow causing data
being read to be lost.

A.I.2.S Header Not Found (HNF)
This error is flagged by the setting of bit 12 of the CSR. When bit 12 is set and bit 10 is also set, the
indication is that the desired header address could not be found before the OPI timer expired.
A.I.2.6 Non-Existant Memory (NXM)
This error is flagged by the setting of bit 13 of the CSR. When bit 13 is set and bit lOis clear, the
indication is that the addressed memory did not respond to the DMA cycle request within 10 to 20
microseconds.
A.I.2.7 Memory Parity Error (MPE)
This error is flagged by the setting of bit 13 of the CSR. When bit 13 is set and bit lOis also set, the
indication is that a data parity error was detected on a DMA cycle to the controller. This error applies
to RL V12 controllers only.
A.t.3 Command Function Code Descriptions
A.I.3.t Write Check - Function Code I
The write check command is used to verify that data was written on the disk correctly. It is used after
writing a block of data onto the disk by the write command function. The write check command reads
this same block of data from the disk and compares it with the contents of its source data buffer area in
main memory. Because this comparison is performed in the controller, this source data must be transferred out of memory and into the controller buffer.
Prior to issuing this command, the BA register must be loaded with the address of the first location of
the data block in the main memory. The word counter register must be loaded with the data block
length. The DA register is then loaded with the starting disk address location. At this point, the write
check command can be loaded into the CS register.
Once the header is found, and the header CRC validates the match, 128 words of data are read from
the disk. The disk data is then compared serially with the serial data coming out of the silo (SER
DATA OUT). Either a compare error or a data CRC error will set bit 11 in the CS register.

A-9

A.l.3.2 Get Status - Function Code 2
The get status command causes the status word from a drive to be transferred to the controller where
the software can access it through the MPR. The software should first verify that the controller is ready
to perform an operation (the drive does not have to be ready). Then, the software should load the DAR
with ones in bits 01 and 00, and zeros in the other locations. Next, the software should load the CSR
with drive-select bits, a negative GO bit, IE bit (if desired) and a code of 2 in the function bits. The
controller will then command the selected drive to transfer its status word to the MPR in the controller.
If the "reset" bit (03) in the DAR is also set, the drive resets its status register before transferring it to
the controller. This is the manner in which volume check is cleared or to check for hard errors.
A.t.3.3 Seek - Function Code 3
The seek operation causes the positioner to move (either forward or reverse) some number of cylinders.
The software should first verify that the drive is ready to accept a command, then load the DAR with
the difference word (difference between the present position and desired position). This word contains
the number of cylinders to move (bits 15 through 07), the head-select bit (04) and the direction bit (bit
02, 1 = forward, O=reverse). Bits 06, 05 and 01 must be reset and bit 00 must be set. After the DAR is
loaded, the software should load the CSR with the command word. This word should contain the driveselect bits, the negative GO bit, the IE bit (if desired), and a code of 3 in the function bits. The controller sends the seek command to the selected drive, causing the drive to start its seek operation. At
this time, the controller becomes ready and interrupts if IE is set. The controller is now ready to accept
another command to perform another operation on another drive while the seek is occurring.
If the difference word is large enough that the heads attempt to move past the innermost or outermost
limits, the head will stop at the guard band and retreat to the first even-numbered data track.

A.t.3.4 Read Header - Function Code 4
When a read header function is decoded, the controller will read the first header encountered on the
selected drive and place the three header words in the buffer. They pass through the buffer and stop
with the first word in the MP register. The software can then access the first word to determine the
current sector, head, and cylinder address. When the software extracts the first word from the MP
register, the second word automatically moves into the MP register. If the software extracts the second
word, the third word automatically moves into the MP. This is the CRC word. The software can now
access it for checking purposes.
A.t.3.5 Write Data - Function Code 5
When this function is decoded with CRDY cleared, the controller reads successive header words and
compares them to the DA register. When a match is found, the header CRC is checked and, if correct,
that sector is written with the words from memory designated by the BA and/or BAE register(s). The
BA and MP registers are incremented for each word that is transferred. For partial sector writes, the
remaining sector area is filled with zeros. At the end of the sector, the sector portion of the DA register
is incremented. The next sector is written if all the words have not been written. At the end of the
transfer, CRDY is set and an interrupt made if IE is set.
A.l.3.6 Read Data - Function Code 6
When this function is decoded, the controller reads successive header words and compares them to the
contents of the DA register. When a match is found, the header CRC is checked and, if correct, that
sector is read and the words are placed in the memory location designated by the BA and/or BAE
register(s). Both the BA and MP registers are incremented for each word that is transferred. This operation continues until the contents of the MP register are all zeros. Data CRC is checked and the DA
register is incremented at the end of each sector. If the word count has not overflowed, the next sector
is read. Otherwise, CRDY is set and an interrupt is made if IE is set.

A-I0

A.l.3.7 Read Data Without Header Check - Function Code 7
When this function is decoded, the data portion of the sector following the next sector pulse is read and
the words requested are placed in the memory locations designated by the BA register. The BA and MP
registers (word count in two's complement form) are incremented for each word transferred. The header is neither compared nor checked for CRC errors. Data CRC is checked at the end of a sector. If the
word count has not overflowed, the next sector is read. Otherwise, CRDY is set and an interrupt is
made if IE is set.
NOTE
The DA register is not incremented during multisector transfer.

"A.2

RLSA ADDRESSABLE REGISTERS

Table A-tO

RL8A Instruction Set

OCTALCQDE

MNEMONIC

FUNCfION

6600

RLDC

Clear controller, all registers, AC and flags. (Do not u~e to terminate a disk function.)

6601

RLSD

Skip on function done, then clear if set to a 1

6602

RLMA

Load break MA register from AC 0: 11

6603

RLCA

Load command register A from AC 0:11

6604

RLCB

Load command register B from AC 0:11, execute command

6605

RLSA

Load sector address register from AC 0:5

"6607

RLWC

Load word count register from AC 0: 11

6610

RRER

Read error register into AC 0, 1, 2, 10, 11

6611

RRWC

Read word count register into AC 0:11

6612

RRCA

Read command register A into AC 0:11

6613

RRCB

Read command register B into AC 0:11

6614

RRSA

Read sector address register into AC 0:5

6615

RRSI

Read silo word into AC 0:11

6617

RLSE

Skip on composite error, then clear if set to a one

,A-II

A.2.t

RL8A Register Description
COMMAND REGISTER A DURING A SEEK COMMAND

DIR

I I

MSB

)

V
CYLINDER DIFFERENCE
CZ-2016

Table A-It Command Register A During a Seek Command

Bit(s)

Name

Function

ACO

Direction

This bit indicates the direction in which a seek is to take place.
When the bit is set, the heads move toward the spindle (to a
higher cylinder address). When the bit is cleared, the heads move
away from the spindle (to a lower cylinder address). The actual
distance moved depends on the cylinder address difference (bits
3-11).

ACI

Head Select
(HS)

Indicates which head (disk surface) is to be selected. A 1
indicates the iower head; a 0, the upper head.
Spare

AC2
AC3:11

Cylinder
. Address
Difference

Indicates the number of cylinders the heads are to move on a
seek.

A-12

Table A-12 Command Register A During Read or Write Data Command
COMMAND REGISTER A DURING A READIWRITE DATA COMMAND

--------------------~)

CYLINDER ADDRESS

CZ-2017

Bit(s)

Name

ACO
ACl

Must be 0
Head Select
(HS)

Indicates which head (disk surface) is to be selected. A 1
indicates the lower head; a 0, the upper head. The correct track
(head and sector) must be previously selected by a seek.
~fust be 0

AC2

AC3:1l

Function

Cylinder
Address

Cylinder address

A-13

Table A-13 Command Register B
COMMAND REGISTER B

00
RES

MAIN MODE

'MSB

LSB

EMAO

EMA1 EMA2

'----v----J
DRIVE SELECT

Bit(s)

Name

CZ-2018

Function
Reserved

ACO
ACl

Maintenance

The contents of the disk address (DA) register are looped back to
the silo for maintenance purposes. Bit 2 of command register B
must also be'set for this function to work correctly.

AC2

Mode

When set, this bit indicates that the data field will be 256 8-bit
words per sector. When zero, the data field will be truncated to
170 12-bit words per sector. This bit must be set when a
maintenance, a get status or a read header command is to be
executed.

AC3

Interrupt
Enable (IE)

When this bit is set, the controller is allowed to interrupt the
processor at the conclusion of a normal command or error
termination.

Bit(s)

Name

Function

AC4:5

Drive Select
(DSO, DS1)

These bits determine which drive will communicate with the
controller via the drive bus.

AC6:8

Extended
Memory
Addressed
(EMA)

These three bits define the memory field location. This allows up
to 32K memory locations to be addressed on processors having
more than 4K of memory.

AC9:11

Function Code

These bits indicate the command to be executed by the
controller / disk subsystem.

A-14

Bit
9

Bit
10

Bit
11

Command

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

Maintenance
Reset
Get Status
Seek
Read Header
Write Data
Read Data
Read Data
Without
Header Check

Table A-14 Break Memory Address Register

------------------------------------------

BREAK MEMORY ADDRESS REGISTER
00

BMOO BM01

BM02 BM03 BM04 BM05 BM06 BM07 BM08 BM09 BM10 BM11

CZ-2019

Bit(s)

Name

Function

ACO:ll

BMO:II

Memory Address

Table A-IS Word Count Register
WORD COUNT REGISTER
00

WCOO We01 WC02 WC03 WC04 WC05 WC06 we 07 WC08 we 09 WC10 we11

CZ-2020

Bit(s)

Name

Function

ACO:II

WCO:!I

Word Count

Table A-16 Sector Address Register
SECTOR ADDRESS REGISTER
00
SA 00

SA.O 1 SA02 SA03 SA04 SA05

CZ-2021

Bit(s)

Name

Function

ACO:5

SAO:5

Sector Address

A-I5

Table A-17 Error Register
1

,""

(

•

ERROR REGISTER

OCRe

OPI

OLT

HeRC

NOT DEFINED

DRDY

HNF
CZ-2022

Hit(s)

Name

Function

ACO

Data CRC
(DRCR) or
HeaderCRC
(HCRC)

If OPI is cleared and this bit is set, the CRC error occurred in the
data (DCRC). If OPI is set and this bit is also set, the CRC error
occured on the header (HCRe).

ACt

Operation
Incomplete
(OPI)

When set, this bit indicates that the current command was not
completed within 200 milliseconds. It is also used in'conjunction
with bits 0 and 2 of this register.

AC2

Data Late
(OLT) or
Header Not
Found (HNF)

This bit is set during a write if the silo is empty and the word
count is not yet 0 (meaning that no word was available for
writing). OPI will not be set.
This bit is set during a read if the silo is full and the word count is
not yet 0 (meaning that the word being read could not enter the
silo). OPI will not be set.
When this bit and OPI are both set, then a 200 millisecond
timeout occurred while the controller was searching for the
correct sector to read or write (no header compare - HNF).

AC10

Drive Error
(DE)

This bit is tied directly to the drive error interface line. When set,
it indicates that the selected drive has flagged an error. The
source of the error can be determined by a get status.
The DE bit is cleared with a reset command to the drive.

AC11

Drive Ready
(DRDY)

When set, this bit indicates that the selected drive is ready to
receive a command. The bit is cleared when a seek operation is
initiated and set again when the seek operation is completed.

A-16

Table A-I8 Silo Buffer Word I of a Get Status Command
...
TTiFiF7T72 - r- _. _. T
·T I, -- "
~-

•

SILO BUFFER -

STATUS WORD 1

NOT DEFINED
WORD 1
CZ-2023

Name
ACO:3

Function
Undefined

AC4

Drive Type

A 0 indicates an RLOI; a 1, an RL02.

AC5

Head Select
(HS)

Indicates currently selected head. A 0 indicates the upper head; a
1, the lower head.

AC6

Cover Open
(CO)

Set when the cartridge access cover is open or the dust cover is
not in place.

AC7

Heads Out
(HO)

A 1 indicates that the heads are over the disk; a 0 indicates that
the heads are home.

AC8

Brush Home
(BH)
State Bits

Set when the brushes are home.

AC9:11

These bits define the state of the disk drive,
State Bit Definitions

Bit
A

Bit
B

Bit
C

Definition

0
0
0
0
1

0
0
1

1
1

Load Cartridge
Spin-up
Brush Cycle
Load Heads
Seek (track
counting)
Lock-on (keeping
on track)
Unload Heads
Spin-down

A-I7

o
1
o
o
1

Table A-19 Silo Buffer Word 2 of a Get Status Command
SILO BUFFER -

NOT DEFINED

STATUS WORD 2

WDE

CHE

STO

SPE

WGE

I I I I I I I

WORD 2
CZ-2024

Bit(s)

Name

ACO:3

Function
Undefined

AC4

Write Data
Error (WDE)

This bit is set when write gate is on but no transitions were
detected on the write data line.

AC5

Current Head
Error (CHE)

This bit is set when write current is detected in the heads but
write gate was not asserted.

AC6

Write Lock
(WL)

Set when the drive is write protected.

AC7

Seek Time Out
Error (SKTO)

Set when the heads do not come on track in the required time
during a seek command or when "ready to read/write" is lost
while the drive is in position (lock-on) mode.

AC8

Spin Error
(SPE)

Set when the spindle does not come up to speed within 40 seconds
or when the spindle speed is too high.

AC9

Write Gate
Error (WGE)

Set if write gate is asserted and one or more of the following
conditions is true.
1.
2.
3.
4.

Drive is not "ready to read/write"
Drive is write protected
Drive is in the midst of sector time
Drive has another error asserted

ACIO

Volume Check
(VC)

Set when a cartridge has been spun-up. This bit is reset by a get
status command.

ACll

Drive Select
Error (DSE)

Set when one or more drives have the same number (unit select
plug) or have responded to the same number.
I

A-I8

Table A-20 Silo Data Buffer Contents Following a Read Header
Command
SILO BUFFER 00

HEADER WORDS

I LSB I HS I MSBI
\.
'--v-J

NOT DEFINED
WORD 1

)

V
SECTOR ADDRESS

CYLINDER
ADDRESS
00

NOT DEFINED
WORD 2

'V
CYLINDER ADDRESS

NOT DEFINED

WORD 3

NOT DEFINED
WORD 4

NOT DEFINED
WORD 5

)

\..

V
HEADER CRC

I I

NOT DEFINED
WORD 6

)

------------------------------~~----------------------------HEADER CRC

CZ-2025

.A-19

WORD 1 - HEADER
Bit(s)

Name

Function
Undefined

ACO:3
AC5

Cyl Add

LSB of Cylinder Address

AC5

Head Select -lower head = 1, upper head = 0

AC6:11

Sec Add

Sector Address
WORD 2 - HEADER

Bit(s)

Name

ACO:3
AC4:11

Function
Undefined

Cyl Add

Cylinder Address - eight high order bits
WORD 3 - HEADER

Bit(s)

Name

Function

ACO:3

Undefined

AC4:11

Zeros
WORD 4 - HEADER

Bit(s)

Name

Function

ACO:3

Undefined

AC4:11

Zeros
WORD S - HEADER

Bit(s)

Name

Undefined

ACO:3
AC4:11

Function

CRC

Eight LSB of CRC word
WORD 6 - HEADER

Bit(s)

Name

ACO:3
AC4:11

Function
Undefined

CRC

Eight MSB of CRC word

A-20

RL8A Controller Commands
A.2.2
The RL8A controller is capable of performing eight operations by responding to the function code in
the low order three bits of command register B. In many cases it is necessary to load other registers
prior to loading the function code into command register B. No registers should be loaded unless the
controller is ready. This condition can be checked by using the appropriate lOT instruction that checks
the function done status or by using the interrupt mode.
A.2.2.1 Maintenance Command
This command tests the controller by causing it to perform the following tasks.
•

The controller requests a data word from memory via the OMNIBUS using the break memory address (BRK MA) register as an address. When the controller receives this word, the
BRK MA and the word count (We) register are both incremented.

•

The data word is bubbled through the silo, serialized and transferred (in 8-bit mode) through
the eRe-generating logic where two more 8-bit bytes are appended. This 24-bit data stream
goes through the write data precompensation logic and then is looped back and brought in as
if it were read data from the drive. The data passes through the phase-locked loop and data
separator logic and into the silo where it is converted back to parallel (eight bits per word),
and bubbles through the silo to be available to the OMNIBUS.

•

The controller requests three memory accesses and transfers the three words back to memory
using the BRK MA register as a pointer. The BRK MA register and we register are incremented for each transfer. The words are now available for the program to check for diagnostic purposes.

•

The above processes repeat and the cycle continues until the we register equals zero.

Prior to starting this command it is necessary to load the following registers.
•

The BRK MA register should be loaded with the address of the first word of data to be transferred to the controller. The next three words of memory will receive three words of data
from the controller.

•

The we register should be loaded with the desired count (in two's complement form). A
complete cycle takes four counts.

•

The command register B should be loaded with 10XO or 14XO. This sets the mode bit to
indicate 8-bit mode. The maintenance bit is a zero. The function code is 000. The remaining
bits are irrelevant.

A.2.2.2t Reset Command
This command is used to reset all of the error bits in the selected drive unit. It does not reset any conditions in the controller nor does it cause any head movement in the drive. Prior to executing this command, the sector address register and command register A must be cleared by using appropriate lOT
. instructions.

A-21

A.2.2.3 Get Status Command
The get status command reads the 16-bit status word from the selected drive and transfers it into two 8bit bytes in two consecutive words in the silo. The computer can then extract them with two lOT RRSI
instructions. The format of the bits are shown in Paragraph 5.2.7.1. Prior to performing a get status
command it is necessary to clear both the sector address register and command register A. When command register B is loaded with the function code, the appropriate drive-select bits should be set, the
interrupt enable bit should be set if desired, and the mode bit must be set for 8-bit mode. The controller
should be ready before performing any of these load register operations but the drive does not have to
be ready.
A.2.2.4 Seek Command
The seek command is used to move the heads or to select the other head on the selected drive. Prior to
executing the seek command, the sector address register should be cleared and command register A
should be loaded with a direction bit, a head-select bit, and cylinder difference word. Command register B is then loaded with the drive-select bits and the seek function code. The controller will send a
command to the selected drive to cause it to start a seek operation. The controller will become ready
and can then perform another command even though the drive is still seeking.
If the drive attempts to move the head past the innermost or outermost tracks, the head ,will retreat
from the guard band and stop at the first even-numbered track it encounters.
A.2.2.S Read Header Command
The read header command will read the first header encountered on the selected drive and load the
header into six consecutive word locations in the silo, one 8-bit byte per word. The computer can then
extract this information with lOT RRSI instructions. The format of the information is shown in Paragraph 5.2.7.2. A check is performed on the header that is read.
A.2.2.6 Write Data Command
The write data command requests data from memory, one word at a time, via the OMNIBUS using the
DMA mode. It then transfers the data through the controller silo buffer to the selected drive. The data
is written at the specified sector data area. This operation continues, incrementing both the break memory address register and the word count register once for each OMNIBUS transfer until the word count
register reaches zero.
Prior to starting this command it is necessary to position the head over the desired track using a seek
command. Then the registers should be loaded as follows:
•

The break memory address register with the address of the first memory word to be transferred,

•

The sector address register with the address of the first sector to be written,

•

The word counter register with the two's complement of the number of words to be transferred,

•

The command register A with the head-select bit and the cylinder address word,

•

The command register B with a mode bit (8-bit or 12-bit mode), interrupt-enable bit (optional), drive-select bits, extended memory address bits, and the write data function code.

A-22

The write data command will then read headers and perform header checks until the desired header is
located. After the header is checked, the data is transferred. The header check includes a header eRe
check. There is no implicit seek performed, so if the selected head is not positioned over the desired
track, the desired header will not be found and an OPI error will occur. If only a partial sector is written, the remainder of the sector is written with all zeros. A eRe word (16 bits) is generated and written
for each sector automatically. Since the word count is limited to 4096, this means that the maximum
amount of data that can be written with one write data command is 16 sectors in 8-bit mode. If 12 bit
mode is used, a maximum of 170 words (one sector) can be transferred. The hardware will not perform
a spiral (mid-transfer) seek. Therefore, if data must be written that would overflow to the next track, it
is necessary to write the data to the end of the track, seek to the next track, and then continue to write
the remainder of the data.
A.2.2.7 Read Data Command
The read data command will cause the controller to read data from the selected drive. It will read from
the track that is currently under the selected head, starting at the specified sector. The data is transferred through the controller silo buffer. The controller requests DMA transfers to memory via the
OMNIBUS. The break memory address and the word count registers are incremented once for each
12-bit word transferred over the OMNIBUS. When the word count register reaches zero, the read data
command is terminated. Prior to starting the read data command, the head should be positioned over
the desired track with a seek command. Load the registers as follows:
•

The break memory address register with the address of the first location in memory to which
the data is to be transferred,

•

The sector address register with the address of the first sector from which the data is to be
read,

•

The word counter register with the two's complement of the number of words of data to be
read,

•

The command register A with a head-select bit and a cylinder address word,

•

The command register B with a mode bit and interrupt-enable bit (optional) drive-select bits,
extended memory address bits, and the function code for read data.

The read data command then reads headers, comparing them to the desired disk address. The data
transfer begins when the desired header is found. The header checks include header eRe checks.
There is no implicit seek, so if the selected head is not over the desired track, the desired header will not
be found and an OPI error will occur.
The RL8A cannot perform a spiral (mid-transfer) seek. If a block of data to be read passes the end of a
track and continues on the other surface or on the next cylinder, it is necessary to program a read data
just to the end of the track. The drive must then seek to the next track and then continue reading data.
A eRe check is performed on each sector during a read data operation.
A.2.2.8 Read Data without Header Check Command
This command is the same as a read data command except that no header check is performed. The next
header read is considered a match so that sector is the first sector read. Since no header check takes
place, no header eRe is performed.

A-23

A.2.2.9 Maintenance Bit
The maintenance bit in command register B enables a path for the serial information leaving the DA
register. When this bit is set, the data that is going out to the drive is looped back and shifted into the
silo. The data bubbles through the silo and becomes accessible (as two 8-bit bytes) to lOT RRSI instructions. The program can then monitor the operation of the DA register which is not a directly addressable register. This feature must be used only with reset, get status, and seek commands. Because
the DA register is a 16-bit register, the 8-bit mode bit should be set. This insures that the contents of the
DA register fit into two 8-bit bytes. The contents of the DA register and the two silo words are illustrated in Figure 5-12. During the loading of the DA register (which occurs on every command), there is
more than one input to some of the bit positions. These inputs are ORed together. Normally, Status
Register A is cleared before any reset, get status, or seek command and control register A is cleared
before any reset or get status command. It is possible to test all the bits in the DA register by using:
selected patterns in control register A and status register A.

A-24

APPENDIX B
. INSTALLATION

B.I SITE PREPARATION AND PLANNING
This appendix describes power, space, environmental, cabling and safety requirements that must be
considered before installing the RLOl/RL02 Disk Subsystem.
B.I.I Environmental Considerations
The RLOl/RL02 Disk Subsystem is designed to operate in a business or light industry environment.
Although cleanliness is an important consideration in the installation of any computer system, it is particularly crucial for proper operation of a disk drive. The RLOIK/RL02K Disk Cartridge is not sealed
while being loaded and is therefore vulnerable to dust or smoke particles suspended in the air, as ",ell as
fingerprints, hair, lint, etc. These minute obstructions can cause head crashes, resulting in severe damage to the read/write heads and disk surfaces.
B.I.I.I Cleanliness - The RLOl/RL02 Disk Drives can operate in an ambient with less than one million particles per cubic foot of air which are 0.5 micron or larger in diameter. The drive contains a filter
system which, under these conditions, maintains the particle count within the cartridge below 100 particles per cubic foot.
B.I.I.2 Space Requirements - Provision should be made for service clearances of 1 m (36 in) at the
front and rear of the rack or cabinet in which the drive is mounted and 1 m (36 in) at either side.
Storage space for the RLOIK/RL02K cartridges should also be made available. Each cartridge has a
diameter of approximately 38 cm (15 in) and a height of approximately 6 cm (2.5 in).
CAUTION
RLOIKjRL02K disk cartridges must never be
stacked on top of each other. A designated shelf area
or specially designed disk cartridge storage unit is
recommended (see the DIGITAL Supplies and Accessories Catalog).
B.I.I.3 Floor Loading - The weight of the RLOI/RL02 Disk Drive alone is 34 kg (75 lb), which will
not place undue stress on most floors. However, the added weight of the rack or cabinet as well as the
number of drives to be installed should be considered in relation to the weight of existing computer
systems. Possible future expansion should also be a consideration.
B.I.I.4 Heat Dissipation - The heat dissipation of each RLOl/RL02 Disk Drive is 546 Btu/hour max- .
imum. The approximate cooling requirements for the entire system can be calculated by multiplying
this figure by the number of drives·, adding the result to the total heat dissipation of the other system
components, and then adjusting the total figure to compensate for personnel, cooling system efficiency,
etc. It is advisable to allow a safety margin of at least 25 percent above the maximum estimated requirements.

B-1

B.l.l.S Acoustics - Most computer sites require at least some degree of acoustical treatment. However, the RL01/RL02 Disk Subsystem should not contribute unduly to the overall system noise level.
Ensure that acoustical materials used do not produce or harbor dust.
B.l.1.6 Temperature - The RLOl/RL02 Disk Subsystem will operate over a temperature range of
10 0 C (50 0 F) to 40 0 C (104 0 F). The maximum temperature gradient is 16.6 0 C (30 0 F) per hour. The
nonoperating temperature range is from -40 0 C (-40 0 F) to 66 0 C (151 0 F).
B.l.l.7 Relative Humidity - Humidity control is important for proper operation of any computer system since static electricity may cause memory errors or even permanent damage to logic components.
The RLO 1/RL02 Disk Subsystem is designed to operate within a relative humidity range of 10 to 90
percent, with a maximum wet bulb temperature of 28 0 C (82 0 F) and a minimum dew point of 2 0 C
(36 0 F). The nonoperating relative humidity range is from 10 to 95 percent, with a maximum wet bulb
temperature of 46 0 C (115 0 F).
B.l.l.8 Altitude - Computer systems operating at high altitudes may have heat dissipation problems.
Altitude also affects the flying height of read/write heads in disk drives. The maximum altitude specified for operating the RLOl/RL02 Disk Subsystem is 2440 m (8000 ft). Also, the maximum allowable
operating temperature is reduced by a factor of 1.8 0 C per 1000m (10 F per 1000 ft) above sea level.
Thus, the maximum allowable operating temperature at 2440 m (8000 ft) would be reduced to 36 0 C
(96 0 F).
'
\

fire
(

B.l.l.9 Power and Safety Precautions - The RL01/RL02 Disk Subsystem presents no unusual
or
safety hazards to an existing computer system. AC power wiring should be checked carefully, however,
to ensure that its capacity is adequate for the added load as wen as for any possible expansion. The
RL01/RL02 Disk Drive is UL listed and CSA certified.
B.l.l.10 Radiated Emissions - Any source of electromagnetic interference (EMI) that is near the
computer system may affect the operation of the processor and its related peripheral equipment. Common EMI sources that are known causes of failures include:

•
•
•
•
•
•
•
•
•

Thunderstorms
Broadcast stations
Radar
Mobile communications
High-voltage power lines
Power tools
Arc welders
Vehicle ignition systems
Static electricity

The effect of radiated EMI emissions on a computer system is unpredictable. Thus, grounding plays an
important role in protecting the circuits used in disk drive subsystems.
To help reduce the effects of known high-intensity EMI emissions perform the following actions:
•

Ground window screens and other large metal surfaces.

•

Ensure that the overall computer system is grounded properly (refer to Paragraph B.14,
Grounding Requirements).

•

Provide proper storage (metal cabinets with doors) for disk cartridges.

B-2

B.l.l.ll Attitude/Mechanical Shock - Performance· of the RLOI/RL02 Disk Subsystem will not be
affected by an attitude where maximum pitch and roll do not exceed 15 degrees.
The subsystem is designed to operate while a half-sine shock pulse of 10 gravity peak and 10 T 3 ms
duration is applied once in either direction of three orthogonal axes (three pulses total).

B.l.2 Options
The RLOI /RL02 Disk Drive can be shipped with various controllers (for Unibus, Ommibus and LSI-II
Bus computer systems), and can be configured for 115 Vac 230 Vac operation.
Table B-1 shows saleable RLOl/RL02 subsystem options. Table B-2 ·shows RLOI/RL02 option components.
Table B-1 Saleable RLOI/RL02 Subsystem Options

Option
Number

Description

RLOIA

RLOI unit, BC20J I/O cable, chassis slide and mounting hardware

·RL02A

RL02 unit, BC20J I/O cable, chassis slide and mounting hardware

RL01-AK

RL01-A (drive), RLOIK-DC (cartridge)

RL02-AK

RL02-A (drive), RL02K-DC (cartridge)

RLOIK-DC

RL01 data cartridge

RL02-DC

RL02 data cartridge

RLII-AK

RL01-AK, RL11 controller, BC06R, terminator

RL211-AK

RL02-AK, RLll controller, BC06R, terminator

RLVl1-AK

RL01-AK, RLV11 controller, BC06R, terminator

RLV12-AK

RL02-AK, RLV11 controller, BC06R, terminator

RL8A.,AK

RLOI-AK, RL8A controller, BC80J, terminator

RL28A-AK

RL02-AK, RL8A controller, BC80J, terminator

RLV21-AK

RLOI-AK, RLV12 controller, BC80M, terminator

RLV22-AK

RL02-AK, RLV12 controller, BC80M, terminator

B-3

NOTE
BC20J cables come in lengths of 20, 40 or 60 feet. If
10 foot cables are desired, then the cable designation
becomes 70-12122-10. Total length of cables from
this controller to the last drive must not exceed 30
M (100 ft.).
Table B-2 Saleable Cabinet Options:
(Includes Skins, Doors,
Covers, Trim, and Power
Controllers)
Type

Volts

Dwg.

Remarks

H950

110
220

H960-BC
H960-BD

Includes five 26.67 cm (10.5 in)
high panels

H967

110
220

H967-BA
H967-BB

26.67 cm (10.5 in) cover panels
(H950-QA) must be ordered if
required

H9500

110

H9603-ED

SWLB with H9514-B top covers

220
110

H9603-EE
H960l-ED

DWLB with H9514-A top covers

220
110

H9601-EE
H9602-EA

SWHB complete hiboy cabinet

220
110

H9602-EB
H9600-EA

DWHB complete hiboy cabinet

220

H9600-EB
H9602-B-O

SWHB option arrangement dwg.
Order as required

H9600-A-O

DWHB option arrangement dwg.
Order as required

H9603-B-O

SWLB option arrangement dwg.
Order as required

H9601-A-O

DWHB option arrangement dwg.
Order as required

H9500

B-4

B.t.3 AC Power Requirements
The RLO 1 or RL02 drive can operate within one of two voltage ranges that are manually selected by
means of two terminal blocks located at the rear of the device (Figure B-1). These voltage ranges are:
NOM
LO

110 Vac
105-128
90-111

220Vac
210-256
180-220

The drive will operate when the line frequency is between 47.5 and 63 Hz.

11 0/220 VOLTS
TERMINAL
BLOCK COVER

CZ-1056

Figure B-1 RLO 1/RL02 Disk Drive - Rear View
B.I.3.t Standard Applications - The drive can be shipped from the factory as a free-standing unit or
mounted in various racks and cabinets (refer to Paragraph B.1.2, Options).
If the drive is shipped as a free-standing unit, the 2.74 m (9 ft) ac power cord is terminated with a
NEMA type S-lSP plug (DIGITAL Part No. 90-08938). This plug requires a NEMA type 5-1SR receptacle (Figure B-2).
B.t.3.2 Optional Applications - Operation in the high voltage range (180-256 Vac) will require reconfiguring the terminal block at the rear of the drive and changing the line cord plug (Figure B-1).
In SO Hz applications, the line cord plug must be changed (Figure B-2).

B-S

PLUG

SOURCE
1lOV
15A
1-PHASE

RECEPTACLE

~=~; (iJ)
NEMA # 6-16P
DEC 1 90-08938

#6262

I 6-16R

12-06361

USED ON
ALL 120VTABlE-TOP
COMPUTERS. STANDARD
120V lOW-CURRENT
DISTRIBUTION. 120V
TU10 UNITS. MOST
120V TERMINAL DEVtCES.

POWER
CONTROLLER·
861-F

All 120V STANDARD
CABINET MOUNTED EOPT

POWER
CONTROLLER
861-C

120V PDP·11/46 PROCESSOR CABINET ONLY.

POWER
CONTROLLER
861-A

120/208V
30A
3-PHASEY

HUBBEl

12611

~
....

NEMA l6-30P
DEC 12-11193
120/208-240V
20A
2-PHASE
or
120/208V
20A
3-PHASEY

1lO/lOBV
lOA
3-PHASE Y

©)

HUBBEl

12411

W
NEMA # l14-20P
DEC 12-11046

HUBBEl
#2611·

12410
l14-20R
12-11046

60 Hz RM 10 DRUM
60 Hz RP02/RP03/
RP04.RP06.RP06

12610
L21·20R
12·11210

DECI12-11209

~
~

NEMA# 6-16P
DEC 190-08863

240V
20A
1-PHASE

L6-30R

12-11194

~eM~ (I L21-20P

240V
16A
1·PHASE

12610

z
All 240V TABLE-TOP
COMPUTERS.
STANDARD lOW-CURRENT
240V DISTRIBUTION.
MOST 240V TERMINAL
DEVICES.
24OVTU10.

6-16R
12-11204

~
@.z' NOTNEMAY~
~
G

HUBBEL
"
*2321
Y
NEMA * l6-20P
DEC * 12-11192

#2320
l6-20R
12-11191

..,.\1
\
Y
\

NEMA, - NOT NEMA
DEC, 12-09010

120V
30A
1-PHASE

60 Hz RM10 DRUM
60 Hz RP02/RP03/
RP04

12-11269

(£--_~w

HUBBEL Y
#2811
NEMA
L21.30P
DEC 12·12314

POWER
CONTROLLER
861-B

W
240/416V
20A
3-PHASEY

All 240V STANDARD
CABINET MOUNTED
EQUIPMENT.

,2810
L21-30R
12·12316

PDP11/70
PROCESSOR
PDP 11/70MEM.
VAX-11/780
PROCESSOR

POWER
CONTROLLER
861-0

CP-1968

Figure B-2 Approved Electrical Plugs and Receptacles

B-6

B.l.4 Grounding Requirements
Each cabinet of a DIGITAL computer system is equipped with ground lug terminals that should be
connected to a low-impedance earth ground by No.4 A WG (5 mm/0.20 in) copper wire or stranded
No.4 A WG welding cable. A Burndy QA4C-B solderless lug (or equivalent) is recommended for terminating the cable. DIGITAL supplies a standard grounding conductor with each I/O and memory cabinet.
A steel building beam is an adequate ground in many instances. However, some disk-oriented systems
may require additional connections to earth ground, in addition to the ground leads carried through
various signal buses and ground connectors contained within the power cables. The green grounding
wire in the power cable must also be returned to ground, usually through the conduit of the electrical
distribution system. Note that the green wire is a not a current-carrying conductor, nor a neutral conductor.
Whenever possible, the system power panel must be either mounted in contact with bare building steel
by bonded joints (Figure B-3) or connected to the steel by a short length of cable.

POWER PANEL

08-0717

Figure B-3 Power Panel Grounded to Building Frame
Where neither scheme is possible, a metal area (comprising the power panel, the conduit, and a metal
plate) of at least 1 m2 (10 ft 2) that is in contact with masonry must be connected to the green ground
wire (Figure B-4). The connecting wire must not exceed 1.5 m (5 ft) in length and should be at least a
No. 12 AWG (2 mm).
When two cabinets are bolted together, DIGITAL bonds them electrically with a No.4 A WG conductor (5 mm/O.20 in) or by several copper mesh straps connected between the cabinet frames.
After the grounding system is installed, it is advisable to take a voltage reading between the cabinet
frame and the nearest grounded object. NBFU No. 70 (published by the National Bureau of Underwriters) provides further details regarding preferred grounding procedures.

B-7

POWER PANEL

PLATE

08 - 0718

Figure B-4 Power Panel Grounded to Metal Plate
B.l.S Installation Constraints
The route from the receiving area to the installation site that the equipment will travel should be studied in advance to ensure problem-free delivery. Among the considerations are:
•
•
•
•

Height and location of loading doors
Size, capacity, and availability of elevators
Number and size of aisles and doors en route
Bends or obstructions in hallways.

B.2 AC CABLING
DIGITAL power wiring conforms to Underwriters Laboratories, Inc., Handbook UL No. 478, National
Electrical Code standards, and the type II requirements of the National Fire Protection Association
(NFPA 70). This means that in the United States the wire used as equipment ground is green, or green
with a yellow stripe; it carries no load current (except in emergency), but does carry leakage current.
No equipment is permitted to leave DIGITAL that does not have a grounding connection to its frame.
The grounded conductor is light grey or white. It must not be used to ground equipment. Its purpose is
to conduct current.
Lines 1, 2, and 3 in a typical 60 Hz power system (Figure B-5) are represented by black, red, and blue
wires, respectively, and phase rotation is in that order.

NOTE
Where no grounded wire can be guaranteed, it must
not be assumed. There are some 115 V/60 Hz systems within the United States where neither side of
the line is grounded (115 V 3-phase delta).

B-8

MAIN CIRCU IT
/ ' BREAKER OR
PHASE A,-..../I'
CUT-OFF CONTACTOR
I '

1
20(V

I
I
I

120V

I
I

MAIN SUPPLY
TRANSFORMER
(ONLY SECONDARY SHOW

PHASE B /"j'"

r "- 1 1
20BV

20BV

I
I

I
I
I

120V

PHASE C

J
1fV

-==-

THE FRAME GROUND CONDUCTOR MAY CONSIST OF ELECTRICAL
METALLIC CONDUIT OR
RACEWAY IF APPROVED BY LOCAL AUTHORITIES.

Figure B-5 Typical 60 Hz Power System

NEUTRAL

FRAME GROUND

J
NOTES:
A. THE NEUTRAL CONDUCTOR SHOULD BE GROUNDED AT THE MAINS
SUPPLY TRANSFORMER
AND IF REQUIRED BY LOCAL AUTHORITIES AT THE DISTRIBUTION
PANEL AND ELSEWHERE.

",.-...

1 I)
L----'

L-.....--'

TO SINGLE PHASE
(TYPICAL)

LOADS

,) ?I)

~
TO THREE
PHASE LOADS
(TYPICAL)

MA·".II

Figure B-6 shows a typical 50 Hz power system.
Two types of power systems can be used to provide power to the NEMA type L 14-20R receptacle. The
type shown in Figure B-7 is referred to as split-phase (or 2-phase 180 0 displaced) 120/240 Vac. It comprises a center-tapped transformer with 120 Vac between the center tap and either of the two legs. 240
Vac exists between the two outside legs.
The second type (Figure B-8) is referred to as 3-phase Y (120 0 displaced) 120/280 Vac. The 120 Vac
exists between neutral and any of the three other legs (X, Y, or Z), and 208 Vac exists between any two
of the outer legs (Le., between X and Y, X and Z, or Y and Z). Although Figure B-8 shows the X and Y
connections as the two phases used for the receptacle, any two of the three phases shown can be used.
The ground terminal on the L14-Z0R receptacle will normally have a green screw, the neutral terminal
will be white or silver, and the "hot" terminal will be brass covered.

~ --l
I
I
POWER LINE
TRANSFORMER

n
+-1
I

~G~______~__________G~R~E~E=N~~

L---~

SAFETY GROUND

(A) 120/240V SPLIT-PHASE (lWO PHASE)

Figure B-7 Split Phase (2-Phase) Power System

I poWER LiNE - - .
I
I
Iz
~x---,I_~__
I
I
~_I--4----+---~
I
I
GREEN
TRANSFORMER

1120V

WHITE
X

OR
GREY

IL- _ _ _ ---1 SAFETY GROUND
(B) 120/208V THREE PHASE

11-2294

Figure B-8 Three Phase Y Power System
B-I0

MAIN CIRCUIT
rBREAKER OR
'"
CUT-OFF CONTACTOR

PHASE A

__--------~------~~--,_--------------~~i'~~~--------------------~~-------

F
MAIN SUPPLY
TRANSFORMER - - - - - - - - (ONLY SECONDAR

38o/ 416v

i
i

220/240V

~L-______+-__~__~____P_H_A_S_E__B_/"~__~____~~____________~r-~

~~ 31

3801

416V

_____

220/240V

PHASE C

L-----~---------,_+~.------~~---r--r------------/~~~-------+-------.-------r~~~-22C . '240V

NEUTRAL

SAFETY EARTH GROUND

I
NOTES:
A. THE NEUTRAL CONDUCTOR SHOULD BE CONNECTED TO EARTH
GROUND AT THE MAINS SUPPLY
TRANSFORMER. IF REQUIRED BY LOCAL AUTHORITIES IT MAY ALSO BE
EARTHED AT THE
DISTRIBUTION PANEL(S) AND ELSEWHERE.
B.

,)
~

,)
"---..,-I

TO SINGLE PHASE LOADS
(TYPICAL)

,) ,) ,)
'-----.,..----J
TO THREE
PHASE LOADS
(TYPICAL)

THE SAFETY EARTH GROUND CONDUCTOR MAY CONSIST OF
ELECTRICAL METALLIC CONDUIT OR
RACEWAY IF APPROVED BY LOCAL AUTHORITIES.
MA·1460

Figure B-6 Typical 50 Hz Power System

B.3 INSTALLATION - GENERAL
The controller should be installed first, followed by the drive(s). Next, the diagnostics should be run to
demonstrate that the subsystem is functioning properly or to diagnose any problems. Paragraph B.4
explains the installation of the RLll Controller, Paragraph B.5 deals with the RLVll, Paragraph 'B.6
describes RL V12 installation, and Paragraph B.7 describes RLS-A installation.
Paragraph B.S contains instructions to install the unit and Paragraph B.9 explains acceptance testing
and contains separate paragraphs for each of the three controllers. Paragraph B.I0 describes the use of
the M9312 bootstrap module that may be used on RLll-based systems.
B.4 RLll CONTROLLER INSTALLATION
The RLll Controller (M7762) is a single hex-height module that is installed in any hex-height SPC
slot. Connector Jl connects the controller to the drive bus (Figure B-9).

OLDER VERSION

Jl
MA-0561

Figure B-9 RLII Component Layout (Sheet 1 of 2)
Of the 21 jumpers on the RL11 Controller, five are used for factory test purposes. The remaining 16
are for address selection:
WI-W6
W7-W16

VECTOR ADDRESS (160)
BASE ADDRESS (774400)
NOTE
A logical 1 is represented by the presence of a jumper wire.

B-12

1,-------,f1 I
I

W7-W16
MA·l465

Figure B-9 RLII Component Layout (Sheet 2 of 2)
The Unibus priority plug sets the priority for bus requests. For the RLII subsystem, bus requests are at
priority level 5 (BR5/BG5). (See Figures B-IO and B-1 I.)
NOTE
Adjustments on the RLII are .preset at the factory
and are not to be changed in the field.
To install the controller:
I.

Remove the M7762 module from its shipping container and examine it for any physical damage.

B-13

VECTOR ADDRESS SCHEME

I
I
I
i
21
217 216 2 15 214 213 2121 211 2 10 2 I 2
24
2 3 I 22
27
26 1 25
1
o
0
0
o 0 0 I 0 o 0 I 0 o 01 0 0 1 1 1
1
X
XIX. W, W3 W 4 W5 W6 W 2 X
X
X
X X X X X
I
.I
I
•
I

160 - W3, W4, W5 JUMPERS IN

FOR VECTOR ADDRESS

W1, W~ Ws JUMPERS OUT
BASE ADDRESS SCHEME

2 1S 1 217

2 16

111
X 1 X

I
I
I

I 28

215 1 214

2 13

2121 211

2 10

111

X 1 X

W121 W 16 W 15 W141 W 7

I 25

23 1

001 0

W l0 W131

o
X

FOR BASE ADDRESS 774400 - W 12 , W 16, W 7 JUMPERS IN
We, W g , W 10, W ll , W 13 , W 14, W 15 , JUMPERS OUT
NOTE:
X'S DENOTE DON'T CARE (NOT SELECTABLE)
1'S DENOTE JUMPER IN
O'S DENOTE JUMPER OUT

CZ-2004

Figure B-I0 RLll Base and Vector Address Jumper Configurations

B-14

16151413121110 9

ee~e--eI

e~~e-e~l.
12345678
PRIORITY JUMPER PLUG FOR
BUS REQUEST LEVEL FIVE (5)
PLUG PIN NUMBER

SIGNAL NAME

UNIBUS PIN

1
2

BGIN

BGOUT

UB BG4

DT2

UB BG 41N

DS2

UBBG 5

DR2

US SG 5 iN

DP2

UBBG6

ON2

UB BG 61N

DM2

UB BG7

DL2

UB BG 71N

DK2

UB BR4

D02

UB BR 5

DE2

UB BR 6

DF2

UB BR 7

DH2
MA-0560

Figure B-11 RL11 Priority Jumper Assembly Connections
2.

If a priority level other than 5 is required, obtain an appropriate priority jumper assembly or
set up the priority jumper assembly (item 1, Figure B-9) using Figure B-1 I as a guide. The
vector and base address jumpers W1-W16 are for 160 and 774400, respectively. If the subsystem configuration requires other than standard addresses, set the jumpers up as shown in
FigureB-10. Physical location of these jumpers is shown on Figure B-9.

Install the ribbon cable (BC06R-XX) with the red indicator stripe to the right and the
smooth side facing the viewer when viewing the component side of the controller as shown in
Figure ·B-12. Dress the cable as necessary.

Insert the controller into its appropriate slot in the SPC backplane as shown in Figure B-12
after ensuring that the slot does not contain a grant continuity module in row D. Do not chafe
the ribbon cable. Route the cable up and out to the rear of the cabinet, allowing for cable
strain relief.

B-15

NOTES:

CABLE FROM
DRIVE (REFI

WHEN INSTALLED IN BAll K OR BAll L
EXPANSION BOX. BC06R CABLE (ITEM #3)
SHOULD BE FOLDED 90° AND ROUTED UP
OUT OF THE BOX AS SHOWN.

WHEN ALTERNATE MOUNTING POSITION
IS USED CONNECTOR IN TRANSITION
BRACKET MUST BE INVERTED SO THAT
1/0 CABLE FROM DRIVE WILL HANG
IN A DOWNWARD POSITION AS SHOWN.

ITEM #3 THRU ITEM #8 ARE NOT
ASSEMBLED AT THIS POINT BUT ARE
SHIPPED WITH UNIT FOR ASSEMBLY
AT INSTALLATION TIME.

PRIORITY JUMPER ASSY (ITEM (1) TO
BE PLUGGED INT~ M7762 AT FINAL ASSY.

THE RL 11 MODULE (M7762) WILL
OCCUPY ONE HEX SPC SLOT.

JUMPER WIRE FROM CAl TO CBl ON
THE SPC BACKPLANE MUST BE
REMOVED AT INSTALLATION.

DESCRIPTION

DWG PART NO.

ITEM NO.

2 SCREW. PHL TRS HD. #10-32 X .50 LG

9006073-03

2 NUT, SPRING #10-32

9007786-00

1 SCREW, TAP-TLTE, #B X .38 LG

9006418-01

1 CLAMP, CABLE

9007083-00

1 TRANSITION BRACKET ASSY

C-AD-7012415-0-0

1 CABLE ASSY

D-UA-BC06R-06

1 RL 11 CONTROLLER

D-UA-M7762-0-0

1 PRIORITY JUMPER ASSY

5408778

CZ-2005

Figure B-12 RL i 1 Controller Installation
NOTE
See Appendix D for configuration rules and SPC
slot selection considerations.

Remove the jumper between CAl and CBl, (NPR Grant) on the backplane, if the jumper
exists.

Install the transition bracket at the rear of the cabinet shown in Figure B-12. Assemble and
install transition connector.

Connect the other end of the ribbon cable (BC06R-XX) with the red indicator stripe on the
top. Use Figure B-12 as a guide.

Apply system power and, using a suitable measuring device (Le., digital voltmeter or equivalent), verify that the voltages are within the ranges specified below.

B-16

Voltage

Range

Test
Point

Ground
+5Vdc
+15 Vdc
-15 Vdc

+4.75 to +5.25 Vdc
+ 14.25 to + 15.75 Vdc
-15.75 to -14.25 Vdc

AC2
AA2
CUI
CBl

Measure all voltages between the ground test point and the appropriate voltage test point. If
any adjustments to the power supply are necessary, refer to the appropriate power supply
manual.
B.S RLVtt CONTROLLER INSTALLATION
An RLVl1 Controller is comprised of a bus interface module (M8014) and the drive bus module
(M8013). Each module has switches, jumpers, trimpots, and connectors that are explained in the following paragraphs.
B.S.t Bus Interface Module
The bus interface module (M8014) contains the logic circuits that perform the major functions listed
below.
.
•
•
•

LSI-II bus interface functions
Programmable registers
Silo data storage and control circuits

An illustration of the component side of M8014 is shown in Figure B-13. The location of the bus address
switches, the vector address switches, and the connector finger assignments are shown in this figure.

B-17

RLV11 BUS INTERFACE MODULE (M8014)
COMPONENT SIDE 1

lAce ,......,

,..

~u ~

BUS ADDRESS SWITCH

LSB~

MSB~ VECTOR SWITCH
LSB

1
V

,.,

IA
A
CZ-2006

Figure B-13 RLV11 Bus Interface Module
(M8014) (Component Side)
The bus address switch is used to set up the device base address. It is normally factory preset to 7440.
This means the device CS register has an address of 174400 and the MP register has an address of
174406. The switches have the ON and OFF positions labeled. The ON position is the logical 1 or true
state (Figure B-14).

B-18

E23044--------LOGIC ELEMENT

r---;------ II 1 ;I
7
I 2 15 I 214 21 3 212

HARDWIRED,---....

:
I

0
5
2 24 2 3

21121029

1 0 0

100

987

654

3 2 1

27 2 6

I
I

IL__ L-__
I

MSB

BASE ADDRESS

BINARY VALUE

S WITCH NUMBER

LSB

FOR EACH "0" SET THE CORRESPONDING SWITCH "OFF"
FOR EACH "1" SET THE CORRESPONDING SWITCH "ON"
USE THIS SCHEME TO SELECT THE APPROPRIATE BASE
ADDRESS IF A DIFFERENT BASE ADDRESS IS REQUIRED
CZ-2034

Figure B-14 RL VII Base Address Switch Setting~

The vector address switch is used to select the address of the vector for this device when it interrupts. It
is factory preset for an address of 160 (Figure B-15).
E22".- - - - - - L O G I C ELEMENT

----,
BINARY VALUE
SWITCH NUMB ER

2 8 27 2 6

2 5 24 2 3

VECTOR ADORE SS

1 0

3 2

MSB

I
I

21 2 0

""--HARDWIRED
0
I
______ JI

LSB

FOR EACH "0" SET THE CORRESPONDING SWITCH "OFF"
FOR EACH "1" SET THE CORRESPONDING SWITCH "ON"
USE THIS SCHEME TO SELECT THE APPROPRIATE
VECTOR ADDRESS IF A DIFFERENT VECTOR
ADDRESS IS REQUIRED

Figure B-IS RLVll Vector Address Switch Settings

B-19

CZ-2007

B.5.2 Drive Module
The drive module (M8013) contains the circuitry that performs the major functions listed below.
•
•
•

Data formatting and error detecting circuits
Control microsequencer and timing circuits
Drive bus interface

An illustration of the component side of M8013 is shown in Figure B-16.
NOTE
Adjustments to the RLVll are preset at the factory
and are not to be adjusted in the field.

[\--J1-I]

CABLE CONNECTO~ TO DRIVE

~ I~ I

veo POT

RLV11 DRIVE MODULE (M8013)
COMPONENT S!DE 1
JUMPERS W2 AND W4 IN PLACE FOR EPROM USE
JUMPERS W1 AND W3 IN PLACE FOR MASKED ROM USE

R~~D 0 ¢
W4W3

EPROM

-A

.J'
B

NOTE:
JUMPERS ARE ZERO OHM COMPOSITION RESISTORS

A
CZ-2008

Figure B-16 RLVll Drive Module (M8013)

B.5.3 Module Slot Location
Modules M8013 and M8014 must be inserted into the H9273 backplane (Figure B-17) such that the
M8013 module is in the slot closest to the processor. Outside of this one restriction, the two modules
can be inserted in any two unused slots. The controller priority level is based solely on its -electrical
distance from the microprocessor module in slot 1.

B-20

PROCESSOR MODULE
I

HIGHEST 'PRIORITY

I
.I

I
I

LOWEST PRIORITY

I
I
I

•

(MODULE SIDE VIEW OF 9 SLOT BACKPLANE)
MA-0566

Figure B-17 H9273 Backplane Grant Priority Structure
B.5.4 Module Installation
I.

Using the normal configuration rules, select two adjacent slots in the backplane for the two
controller modules.

Insert the ribbon cable (BC06R-XX) into JI on the MSOl3 with the red stripe edge toward
the top (Row A) of the module.

Insert the MSOl3 module into the selected slot that is closest to the processor.

Examine the MSO 14 to insure that the base address switches and the vector address switches
are set correctly. See Figures B-14, B-15, and B-16.

Insert the MS014 module next to the MSOI3.

Install the transition bracket at the rear of the cabinet as shown in Figure B-12. Assemble
and install the transition connector.

Connect the other end of the ribbon cable with the red stripe up.

Apply system power and, using a suitable measuring device (Le., digital voltmeter or equivalent), verify that the voltages are within the ranges specified below.

Voltage

Range

Test
Point

Ground
+5Vdc
+12 Vdc
-5Vdc

+4.75 Vdc to +5.25 Vdc
+ 11.5 Vdc to + 12.5 Vdc
-5.25 Vdc to -4.75 Vdc

AC2
AA2
AD2
ALl (MSOl3 only)

B-21

NOTE
The -5 Vdc is generated on the M8013 module. It
is not adjustable but must be within specifications
for proper operation. Module replacement is the
only corrective procedure.
Measure all voltages between the ground test point and the appropriate voltage test point. If
any adjustments to the power supply are necessary, refer to the appropriate processor's service manual.
B.6 RLV12 CONTROLLER INSTALLATION
B.6.1 Introduction
The following paragraphs provide the user or installer with information to correctly configure and install the RLV12 in a 16-, 18-, or 22-bit LSI-II bus. The user can change the device address, interrupt
vector, and memory parity error abort feature.
B.6.2 Device Address Selection
Software control of the RLV12 is by means of four or five device registers - CSR, BAR, DAR, MPR,
and BAE. Four registers are used for 16- or IS-bit addressing; five registers are used for 22-bit addressing. The bus address extension (BAE) register is added for l.Wper address bit selection for 22-bit addressing. The usual device starting address is as follows.
Addressing
Mode

Starting
Address

16-bit
18-bit
22-bit

174400
774400
17774400

The first register, the CSR, is assigned the starting address and the other registers are assigned the next
sequential addresses as shown in Table B-3.

B-22

Table B-3 Address Selection

16-bit
Addressing

18-bit
Addressing

22-bit
Addressing

Starting
Address
Range:

160000177770

760000777770

1776000017777760

Starting
Address:

174400

774400

17774400

No. of
Registers:

8 (5 are used;
3 are not)

Registers
Used:

CSR (174400)
BAR (174402)
DAR (174404)
MPR (174406)

CSR (774400)
BAR (774402)
DAR (774404)
MPR (774406)

CSR (17774400) "
BAR (17774402)
DAR (17774404)
MPR (17774406)
BAE (17774410)

Jumpers
Used:

Tie M22 ("I")
to: M17, M20,
and M21

Tie M22 ("1")
to: M17, M20,
and M21

Tie M22 ("I")
to: M17, M20,
and M21;

Device
Address

Tie Mil ("X")
to: MI2
Interrupt
Vector
Vector
Range:

0-774

Standard
Vector:

160

Jumpers
Used:

Tie M3 ("1")
to: M6, M7,
andM8

Tie M3 ("I")
to: M6, M7,
andM8

Tie M3 ("1")
to: M6, M7,
andM8

The device starting address is selected by jumpers for bits 3 through 12. These jumpers are shown in
Figure B-18. A jumper from the selected bit to ground (M22) decodes a 1; no jumper decodes a 0; and a
jumper to + 5 V (M 11) decodes an X (don't care) condition. Figure B-19 shows the RL V 12 device
starting address format.
B-23

ENABLE CRYSTAL
_~M29
Il.-M28
ENABLE
VCOCLK
M27 M26

NOTE;
THE MEMORY PARITY ERROR ABORT
FEATURE IS AVAILABLE FOR USE
WITH MEMORIES THAT HAVE PARITY
ERROR CHECKING.
THIS FEATURE DOES NOT HAVE TO
BE DISABLED FOR MEMORIES THAT
DO NOT HAVE PARITY ERROR
CHECKING. THE PINS ARE CONNECTED AS FOLLOWS:
CONNECTION

FUNCTION

M23 - M24
M24 - M25

NO PARITY
PARITY ERROR ABORT

TEST POINT
M30

M"-+5V
M12 - A3
M13 - A4
W3
M14 - A5
-c::::JM15 - A6
DEVICE
M16 - A7
ADDRESS
M17 - A8
PINS
M18 - A9
M19-A10
M20 - All
M2l-A12
M22-- GND
W2 Wl

PASS CD PRIORITIES
(CDMG. CIAK)

MEMORY PAIRITY ERROR
ABORT SELECTION
M23 .
"M24 SEE NOTE
M25
Ml0 M9 M8 M7 M6 M5 M4 M3
V8 V7 V6 V5 V4 V3 V2 VEe TO BUS H

JUMPER
ASSEMBLY

M2
Ml
ENABLE
22-IBIT ADDRESSING
MR·5748

Figure B-18 . RLV12 Jumper Locations

07
A7

BANK SELECT 7
FOR 18-BIT
ADDRESSING

CSR
BAR
DAR
MPR
BAE

22-BIT ADDRESSING
(CONNECT M1 TO M2)

M21

M20

M19

M18

M17

I I I I
A6

1 I 1 I I
0

M16

M15

M14

M13

M12
,

1111111111

'----------BA-N-K-SE-L'VVE-C-T-7-F-O-R-------J1
FACTORY
CONFIGURATION

BUS ADDRESS PINS
CONNECT TO GROUND (PIN M22)
TO DECODE A 1. CONNECT TO +5 V (PIN M11)
FOR A DON'T CARE (X) CONDITION.
NO CONNECTION DECODES A O.

774400
774402
774404
774406
774410

MA·174t

Figure B-19

R LV 12 Device Address Format

NOTE
For 22-bit addressing, bit A3 is not decoded in the
starting address.
B.6.3 Bus Selection
The RLV12 module can be used on 16-, 18-, or 22-bit LSI-II buses. When sent from the factory, the
module operates on 16- or I8-bit buses. To enable the module to operate on a 22-bit extended LSI-II
bus, install jumper Ml to M2, shown in Figure B-18. When installed, the jumper enables bank select 7
(BBS7) to be determined by the upper address bits (13-21). When the jumper is removed, the RLV12
has an 18-bit mode bank select 7 and can replace an existing RLVII or RLV21 as the disk controller
for RLOI and RL02 disk drives.
D.6.4 interrupt Vector
The interrupt vector has a range of 0 to 774. The interrupt vector is preset at the factory to 160. The
user may select another vector by changing the jumpers for bits V2-V8, as shown in Figure B-20. A
connection to VEC TO BUS H (M3, shown in Figure B-18) generates a 1 for that bit; no connection
generates a O.

:' , 2: ,'9 1'8 1:
FACTORY
CONFIGURATION
160

I
{
I

I I 111I I

Ml0

INTERRUPT VECTOR PINS
CONNECT TO PIN M3
TO DECODE A 1.
NO CONNECTION DECODES A O.
MR·5750

Figure B..20

RI,VI2 Format Interrupt Vector

B.6.5 Interrupt Request Level
The RLV12 interrupts at priority level 4 determined by the interrupt chip E23, a DC003.
B.6.6 Memory Parity Error Abort Feature
When reading the system's optional memory with parity error detection, a parity error will set OPI and
NXM of the CSR. This is a unique error condition that aborts the current command to the RLVI2.
This error abort feature is possible only with memories that have parity data bits.
The RLV12 is sent from the factory with the memory parity error abort feature enabled. To disable
parity error abort, remove the jumper between pins M24 and M25 and install a jumper between pins
M23 and M24 (see Figure B-18). This feature does not have to be disabled for non-parity memories, as
parity errors are not generated. Parity error abort uses data bits 16 and 17.

B-26

B.6.7 Other Jumpers
The module has two jumpers, WI and W2, that enable priority signals to pass on the CD side of the
module. The module has these jumpers installed and they should be left in when this controller is installed on the normal LSI-II bus. If the RLVI2 is installed in a C-D interconnect backplane with another module already in place, then these jumpers are removed. If the other module does not use the CD interconnect scheme, then the status of jumpers WI and W2 is not important.
Jumper

Signal

WI
W2

CIAKI to CIAKO
CDMGl to CDMGO

One jumper,W3, enables the word count register to automatically increment during a DMA operation.
This jumper is used for factory testing and should be left in.
Two jumpers on the module disable the crystal oscillator and the voltage-controlled oscillator during
factory testing. These jumpers should be left in.
.Jumper

Oscillator

M26-~f27

'Tr"A

M2S-M29

Crystal

y,",v

B.6.8 Installation
The RLVI2 can be installed in any quad LSI-II bus slot. The controller's priority level is based on its
electrical distance from the processor module. Use the following procedure to· install the module.
1.

Examine the module to make sure that the base address jumpers and vector address jumpers
a~e set correctly. (See Paragraphs B.6.2 and B.6.4.)

Check jumpers M 1 and M2 for enaoling the correct bank select 7 (BBS7) for the IS- or 22bit LSI-II bus.

If desired, disable the memory parity error abort feature. This feature can only be used with
system memories that have parity options, but this feature does not have to be disabled for
non-parity memories. (See Paragraph B.6.6.)

Insert the BCSOM controller cable into J 1 on the MS06I.

Insert the MS06I in the selected slot in the LSI-II bus.

Connect the other end of the BCSOM cable to the drive.

Continue with the disk installation. (Refer to Paragraph B.S.)

B-27

B.6.9 Acceptance Testing
The RL V 12 controller is tested by running the RL V 12 diskless diagnostic test and, if a drive is attached, by running the diagnostics that exercise the RLO 1 and RL02 disk drive. The diskless diagnostic
should be run first. The RL V12 diagnostics are available on different media. Contact your local
DIGITAL sales office for the types of media available and their part numbers.
Run the XXDP+ diagnostics in the following order.
1.
2.
3.
4.

CVRLB RLV12 Diskless Diagnostic (16-, 18-, or 22-bit mode)
CZRLG Controller Test Part 1
CZRLH Controller Test Part 2
CXRLI Drive Test Part 1

CZRLJ Drive Test Part 2

6.
7.
8.
9.

CZRLN Drive Test Part 3
CZRLK Performance Exerciser
CZRLL Compatibility Test
CZRLM Bad Sector File Utility

NOTE
The Bad Sector File Utility is not a diagnostic test.
It is used by Field Service personnel to examine the
bad sector fIle on the disk and to write entries into
that fde.
B.7 RL8A CO:N....ROLLER iNSTALLATION
B. 7.1 Introduction
The RL8A Omnibus controller module (M8433) contains the logic functions listed below.

•
•
•
•
•
•

Interface logic
Programmable registers
Silo data storage and control
Data formatting and error detection
Control microsequencer and timing logic
Drive bus interface logic

NOTE
Adjustments on the RLSA are preset at the factory
and are not to be changed in the field.
B.7.2 Module Slot Location
The module can be inserted into any unused OMNIBUS hex-height slot between the CPU and the first
memory element. The controller is connected to the first drive via a BC80J-20 interface cable. Connections between drives are made using a BC20J-XX (70-12122-10) cable.
B.7.3 Module Installation
1.

Remove the M8433 module (see Figure B-18) and interface cable (BC80J-20) from the shipping container and inspect them for physical damage.

Verify the proper jumper configuration for device codes and priority (Figure B~21).

B-28

W,O

,2;;-;4
-3:'--1 ROM

"':":'E'==-33--.

M8433
RL8A
DISK CONTROLLER

W7
W8

W4
~

C....---_J

------

--W,

W2
~

cz·amo

Figure B-21

RL8A Jumpers

Device
Code

60,61
62,63

IN
IN

OUT

Break
Priority

0
1

IN
OUT

OUT

NOTE
RLSA is shipped from the factory with a priority of

O.
Device
Type

RLOI
RL02

OUT

(EI33)

WI0

Wll

012E2
8708 or
2708

OUT

IN
OUT
OUT IN

OUT

ROM Type

OUT

B-29

Position the BC80J-20 interface-to-drive cable in the PDP-8 chassis and connect the Berg
connector to the M8344 module.

Install the M8344 module into selected slot in the OMNIBUS backplane.

Route the cable out to where the first drive will be installed.

B.S RLOt/RL02 DISK DRIVE INSTALLATION
B.S.t

Unpacking and Inspection
1.

When delivered, each drive and its associated cabinetry is enclosed by a heavy cardboard
carton. If the drive is shipped with a system and mounted in a cabinet, then the carton is
attached to a shipping skid (Figure B-22). Remove the plastic straps that secure the shipping
carton to the skid.

FULL TELESCOPE CAP

(9905446)

5-PANEL FOLDER

(9905975)

CRATING SLAT

(7606858)

11~979

Figure B-22

H950 Shipping Package

B-30

Remove the lid from the top of the carton.

Remove the staples that fasten the wooden crating slats and carton flanges to the skid.

Remove the shipping carton.

Inspect the cabinet and drive for signs of damage. Retain all packing material and receipts in
the event that any claims for shipping damage must be filed. All claims should be filed
promptly with the transportation company.

B.8.2 RLOI/RL02 Disk Drive Unit Mounting

NOTE
If the RLOI/RL02 is to be mounted in an H9S0 cabinet, the shipping brackets must be retained and refitted after installation. This is the only way to prevent the drive from sliding while repositioning or
moving the H9S0 cabinet.
The drive may be shipped in a rack or cabinet as an integral part of a system or may be shipped in a
separate container for addition to an existing system.
If the drive is to be installed in an existing rack or cabinet, install the chassis slides first as described in
Steps 1 through 6 below (Figure B-23). The procedure for installing the drive itself begins with Step 7.
1.

Install cabinet stabilizers before mounting the drive.

Remove the slides from the carton. (Retain the hardware for reassembly.)

Install slides into the rack or cabinet using enclosed hardware. Be sure the slides are at the
correct height to permit installation of pop panels (dress panels) upon completion of installation. Also verify that the slides do not bind on any hardware used to mount the slide.

Extend slides to lock position.

Slide drive onto chassis slides and reinstall mounting hardware.
a.

Figure B-23 shows the relationship between the drive, slide mounting rails, and slides.
Note first the postition of the slide mounting rails. These rails are currently 'riveted to
the sides of the drive.

The cabinet slides fit under the edge of the mounting rails. The forward edge of the
mounting rails are curved to grip the curled edge of the slides (see Figure B-23a, B-23b
and detailed view A. )

At the rear of each slide is a locking tab that grips the top rear edge of the rail (Figure
B-23b).

The drive should be carefully placed on top of the slides hooking the front and rear of
each slide as previously described.

When properly placed, the locking latch (Figure B-23b) on each mounting rail drops
into a groove on each slide. This holds the drive securely so that the screws may be
inserted to bolt the front of each slide to the drive (Figure B-23b).
B-31

CARTRIDGE or CUSTOMER ACCESS
COVER

OPERATOR'S CONTROL PANEL

Figure B-23a
f.
6.

CZ-0502

RLO 1/ RL02 Cabinet Installation
After bolting the front of each slide, adjust the length of the slide (using the slide extension release catch) so that the rear slide screw may be inserted (Figure B-23b).

Ensure that the disk drive moves easily on the slides, that there is no binding in the cabinet,
and that the proper height has been maintained for dress panels.

8-32

RIVETS

LOCKING TAB

LOCKING LATCH

LOCKING
LATCH GROOVE
SLIDE EXTENSION RELEASE
CATCH

BUMPER

Figure B-23b
7.

RLO 1/ RL02 Cabinet Installation

Open the drive access cover by loosening the four captive fasteners holding the module access cover. When the screws are sufficiently loosened to raise the cover, the drive access cover may then be lifted off the drive. The module access cover may be rested on the rear lip of
the drive (Figure B-24).

B-33

DR IVE LOGIC _ _--ii-n-----r_ _ ______
MODULE

D.C.SERVO MO
LE
AND TEMPLATE
MA-0564

Figure B-24

RLOll RL02 Disk Drive Exposed Drive Logic Module

Loosen the head restraining bracket screw located on the positioner. Tum the bracket 90
degrees and retighten the screw (Figure B-25).

On newer drives, there are two shipping screws on the bottom of the unit that secure the
spindle/blower motor. Remove the screws.

10.

If the drive is being installed in a dual-drive cabinet that has an interlock system to prevent
more than one drive being extended at a time, ensure that it is connected.

11.

Inspect the terminal block covers at the rear of the drive. Ensure that they are configured
properly for the input power available (Figure B-22).

B-34

POSITIONER
FRONT VIEW:

POSITIONER
RESTRAINING
BRACKET

LATCH
SOLENOID
ACCESS COVER

CZ-2003

Figure B-25

RLO 1/ RL02 - Covers Removed
CAUTION
Connection to the wrong power source will result in
serious damage to the disk drive.

12.

If there is only one disk drive in the system, or if this is the last drive of the daisy-chain,
install a terminator assembly (DIGITAL part no. 70-12293) in the "cable out" location at
the rear of the drive (Figure B~26).

B-35

TERMiNAL BLOCK ------;:;;........
COVER

11 0/220 VOLTS
TERMINAL
BLOCK COVER

CZ-1056

Figure B-26

RLOljRL02 Disk Drive - Rear View
NOTE
On newer-drives, a shielded cable is used. Its part
number is BC2tZ-XX.

13.

If this is an RLll- or an RLVll-based system, route the I/O cable BC20J-XX (DIGITAL
part no. 70-12122-10) between the first drive and the transition connector. If this is an
RL8A-based system, route the BC80J-20 cable from the RL8A to the first drive. If this is an
RLV12 based system, route the BC80M-6 between the RLV12 and the first drive.

14.

If this is a multi drive installation, connect an I/O cable from "cable 'in" of this drive to the
"cable out" connector of the previous drive. Repeat for each drive.
NOTE
The total length of cable from controller to the last
drive must not exceed 30 m (tOO ft).

15.

Install the proper unit select plug at the front of the drive (Figure B-27).

B-36

LOAD SWITCH
AND INDICATOR
UNIT SELECT PLUG
AND READY INDICATOR

WRITE PROTECT SWITCH
AND INDICATOR
CZ-1005

FigureB-27

RLOI/RL02 Disk Drive - Front Vjew

B.8.3 Drive Prestart-up Inspection
To begin the inspection procedure, remove the top cover by loosening the captive screws and lifting the
cover straight up. Rest the cover on the rear of the drive. With the drive power off, follow these steps.
1.,

Ensure that the positioner restraining bracket is secured out of position to prevent interference with the positioner (Figure B-25).

Ensure that the positioner is home.

Ensure that the read/write head gimbels are not bent or dirty. (If they are dirty, clean with a
solution of 91 percent alcohol and 9 percent water and a lint-free wiper.)

Ensure that the spindle rotates freely and its top surfaces are not dirty. (Clean as described
above.)

Ensure that the brush assembly is home (not exposed).

B-37

NOTE
An engineering change has eliminated the need for
brushes on the drive. On newer RLOt and RL02
drives, the brush assembly has been replaced with a
unit containing only the cartridge-in-place and top
cover interlock. The drive logic module also contains
some logic changes to accommodate the brush cycle
removal.

Ensure that the logic modules and connectors are seated firmly.

Turn CBl ON.

Ensure that the spindle rotates slowly counterclockwise for approximately 15 seconds and
stops. At this time, the LOAD light will come on.
.

NOTE
On the newer drives (without brushes), the spindle
will NOT rotate until both the top cover and the cartridge-in-place interlocks are depressed.

Ensure that the FAULT light is not on.

10.

Ensure that the cooling fan at the rear of the drive is operating.

11.

On the newer drives, release the top cover and cartridge-in-place interlocks, noting that the
spindle stops rotating.

12.

Using a suitable measuring device (i.e., digital voltmeter or equivalent), ensure the following
drive voltages are within the specified tolerances.

Voltage

Range

Test
Point

+15 UNREG
-15 UNREG
+5 REG
+8 REG
-8 REG

(+ 15.0 to + 18.0 Vdc)
(-15.0 to -18.0 Vdc)
(+4.48 to +5.1 Vdc)
(+ 7.7 to +8.3 Vdc)
(-7.7 to -8.3 Vdc)

+VUNREG
-VUNREG
TP8
TP4
TP5

See Figure B-24 for dc servo module location. Test points are located on the mask covering
the dc servo module.
12.

Verify that the WRITE PROTect switch cycles in and out and the indicator lights up when
the switch is pressed.

13.

Verify that the LOAD switch cycles in and out and the indicator light goes out when the
switch is pressed. Return switch to the "out" position.

14.

Turn off CBl.

15.

Reinstall the top cover and secure with the captive screws.

B-38

16.

Ensure that the drive access cover cannot be opened.

17.

Turn CB 1 on and ensure the drive access cover will open.

B.S.4 Drive Start-up Operation Check
1.

With the drive power ON, install a scratch cartridge.

Close the cover, press the LOAD switch and note that:
•

The LOAD light goes out

•

When the cartridge reaches nominal speed (after approximately 30 seconds), a brush
cycle commences on those drives that have brushes. When the brushes have returned
home, the read/write heads load and approach cylinder o. When the heads have locked
onto cylinder 0, the READY light illuminates. The total time for this process is approximately 45 seconds.

Press the LOAD switch again. The READY light should go off and the read/write heads
should retract to their home position. The spindle should slow down and then come to a complete stop after about 30 seconds. The LOAD light illuminates when the spindle stops.

If the drive start-up operation check detailed above is successfully completed (i.e., the
READY indicator illuminates), run the subsystem confidence tests described in Paragraph

B.S.
B.9 CONFIDENCE TFSTING
Confidence testing consists of running the diagnostic programs. Each diagnostic has a listing that contains operating instructions. Each listing explains system hardware requirements, software environment, which features are tested and how they are tested, program options and how to select them, how
to interpret printouts, error handling, device information tables, dialogue with the Diagnostic Supervisor, and complete operating instructions. The listings are available as hard copy printouts or on microfiche.
The binary form of the diagnostic programs is available on various media. It is always advisable to keep
a copy of the RLOl/RL02 diagnostics on a media other than the RLOIK or R~02K cartridge so that
the diagnostics can be loaded through another device if the RL subsystem is down.
The old MAINDEC naming system is replaced with a new naming system. Manual and microfiche
designations are also converted. In addition, part numbers are assigned that conform to DIGITAL's
standard twelve character part number system.
When ordering diagnostic media, listings, manuals, or microfiche, check the current catalog or index
for the latest designation and revision level. The applicable catalogs and indexes are listed in Table B-4.
Unless otherwise specified when ordering, the latest revision will be shipped.

B-39

Table B-4 Diagnostic Catalogs and Indexes
Name

Part Number

PDP-II Diagnostic Software Components Catalogue*
PDP-8 Software Components Catalogue*
PDP-II Maindec Index (microfiche)
PDP-8 Maindec Index (microfiche)

AV-B02IE-TC
AV-0872B-TA
AH-9026P-MC
AH-6572G-MA

Both of these catalogs are available on microfiche (EP-08/ II)

B.9.1 RLll-Based Diagnostics
The diagnostic package used for an RLII/RLOI subsystem before the release of the RL02 consisted of
the six free-standing programs listed in Table B-5. There were two revisions, Revision A and Revision
B. These programs handled only RLOI drives (not RL02 units).
Table B-S RL11 Based Diagnostics
Part Number

Description

CZRLAAO
CZRLBAO
CZRLCAO
CZRLDAO
CZRLEAO
CZRLFAO

Controller Test Part I
Controller Test Part 2
Drive Test Part I
Drive Test Part 2
Performance Exerciser
Drive Compatibility Test

These diagnostics can be run free-standing under the Diagnostic Supervisor, manually under XXDP,
chainable under XXDP (except CZRLFAO which requires manual intervention), or under manufacturing checkout environments such as SLIDE or ACT-Il.
A new diagnostic package is available to test either an RLOI or an RL02 unit. The kit numbers are
listed in Table B-6 and the contents of the tests are shown in Table B-7.
Table B-6 RLll Diagnostic Kit Numbers

Part Number

Description

ZJ283-RB
ZJ283-RZ
ZJ283-PB
ZJ283-FR

Documentation and paper tape
Documentation only
Paper tape only
Microfiche only

B-40.

Table B-7 RLII Diagnostic Components
Part Number

Name

Item

AC-FI11A-MC
AH-FI10A-MC
AK-FI0SA-MC
AK-FI09A-MC
AF-FI11A-MO

CZRLGAO Controller Test #1

Documentation
Fiche
Paper tape # 1
Paper tape #2
DECO

AC-FI15A-MC
AH-FI14A-MC
AK-FI12A-MC
AK-FI13A-MC
AF-FI15A-MO

CZRLHAO Controller Test #2

Documentation
Fiche
Paper tape # 1
Paper tape #2
DECO

AC-FI19A-MC
AH-FllSA-MC

CZRLIAO Drive Test #1

Documentation
Fiche
Paper tape #1
Paper tape #2
DECO

AC-FI23A-MC
AH-FI22A-MC
AK-FI20A-MC
AK-FI21A-MC
AF-FI23A-MO

CZRLJAO Drive Test #2

Documentation
Fiche
Paper tape #1
Paper tape #2
DECO

AC-FI27A:;,MC
AH-FI26A-MC
AK-FI24A-MC
AK-FI25A-MC
AF-FI27 A-MO

CZRLKAO Performance Exerciser

Documentation
Fiche
Paper tape #1
Paper tape #2
DECO

AC-FI31A-MC
AH-FI30A-MC
AK-FI2SA-MC
AK-FI29A-MC
AF-FI31A-MO

CZRLLAO Drive Compatibility Test

Documentation
Fiche
Paper tape #1
Paper tape #2
DECO

CZRLMAO Bad Sector File Utility

Documentation
Fiche
Paper tape #1
Paper tape #2
DECO

AK-Fl16A~MC

AK-FI17 A-MC
AF-FI19A-MO

AC-FI35A-MC
AH-FI34A-MC
AK-FI32A-MC
AK-FI33A-MC
AF-FI35A-MO

B-41

There is an additional program added to the package named CZRLMAO. It is used to read the Bad
Sector File and can be used to write entries into the field writable portion of the Bad Sector File. This
program is not a diagnostic and should not be used as one. It assumes that the system is functioning
properly.
In addition to the free-standing diagnostics, there is a DECXll module for use with the DECXll System Exerciser. The current revision is designated RLAA and is in DECXll Option Library #5
DXQLQ. Revision A (RLAA) will operate an RLOI drive only. Revision B (RLAB) will operate either
an RLO 1 or an RL02.
There is also an RL subsystem driver for the Maintenance Program Generator (MPG).
The binary form of the diagnostics is included as part of XXDP. This makes it available on media for
the RK05, RK06, RK07, RLOl, RXOl, DECtape, magnetic tape, and DECassette.
The use of XXDP, DECXll, and MPG is explained in the manuals listed in Table B-8.
Table 8-8 User Documents

Part Number
HardCopy

Part Number
Microfiche

Name

AC-9093I-MC
AC-8240Z-MC
AC-816JC-MC

EP-DZQXA-J-D
AH-8242Z-MC
EP-DTUMA-C-D

CZQXAIO XXDP User Guide
CXQBAZO DECXll User Document
CTUMACO M.P.G. User Manual

B.9.2 RLVll-/RLVl2-Based Diagnostics
The RL VII /RL V12 controller-based subsystems are tested with the same set of diagnostics as RL 11
controller subsystems with the following exception. THe RLVll/RLVI2 subsystems have an internal
maintenance feature that is not tested by the RL 11 diagnostics. Therefore, there is one additional diagnostic program. This program is called the CVRLA Diskless Test for use on the RLVII subsystems.
RLV12 subsystems use CVRLB Diskless Test. At some point in time CVRLB will replace CVRLA.
The diagnostic kit includes the same items as the RLll diagnostic kit plus the CVRLAAO test. The
RLVll kit designations are shown in Table B-9.
The DECXll module is the same one used for the RLll.
Table 8-9 RLVll/RLV12 Diagnostic Kit
Designations

Designation

Contents

ZJ285-RB
ZJ285-RZ
ZJ285-PB
ZJ285-FR

Documentation and paper tape
Documentation only
Paper tape only
Microfiche only

B-42

B.9.3 RLSA-Based Diagnostics
There are six free-standing diagnostic programs for the RLSA/RL01 Controller-based system. There is
also a DECXS module for use with the DECXS system exerciser. These diagnostics are available as
individual components (see Table B-10) or in a kit (see Table B-11).
Table B-IO RLS/RLOI Diagnostic Components

Part Number

Designation

AC-C656A-MA
AH-C657A-MA
AK-C65SA-MA
AL-C659A-NA
AC-C660A-MA

AJRLAAO, RLSA Diskless Control Test (Document)
AJRLAAO, RLSA Diskless Control Test (Fiche)
AJRLAAO, RLSA Diskless Control Test (Paper tape)
AJRLAAO, RLSA Diskless Control Test (DEC tape)
AJRLBAO, RLSA/RL01 Drive Test 1 (Document)

AH-C661A-MA
AK-C662A-MA
AL-C663A-NA
AC-C664A-MA
AH-C66SA-MA

AJRLBAO, RLSA/RL01 Drive Test 1 (Fiche)
AJRLBAO, RLSA/RL01 Drive Test 1 (Paper tape)
AJRLBAO, RLSA/RL01 Drive Test 1 (DECtape)
AJRLCAO, RLSA/RLOl Drive Test 2 (Document)
AJRLCAO, RLSA/RL01 Drive Test 2 (Fiche)

AK-C666A-MA
AL-C667A-NA
AC-C66SA-MA
AH-C669A-MA
AK-C670A-MA

AJRLCAO, RLSA/RL01 Drive Test 2 (Paper tape)
AJRLCAO, RLSA/RL01 Drive Test 2 (DECtape)
AJRLDAO, RLSA/RL01 Compat. Verify (Document)
AJRLDAO, RLSA/RL01 Compat.· Verify (Fiche)
AJRLDAO, RLSA/RL01 Compat. Verify (Paper tape)

AL-C671A-NA
AC-C672A-M:A
AH-C673A-MA
AK-C674A-MA
AL-C675A-NA

AJRLDAO, RLSA/RL01 Compat. Verify (DECtape)
AJRLEAO, RLSA/RL01 Perf. Exer. (Document)
AJRLEAO, RLSA/RL01 Perf. Exer. (Fiche)
AJRLEAO, RLSA/RL01 Perf. Exer. (Paper tape)
AJRLEAO, RLSA/RL01 Perf. Exer. (DECtape)

AC-C676A-MA
AH-C677A-MA
AK-C67SA-MA
AC-C6S2A-MA
AH-C6S3A-MA

AXRLAAO, RLSA DECXS Module (Document)
AXRLAAO, RLSA DECXS Module (Fiche)
AXRLAAO, RLSA DECXS Module (Paper tape)
AJRLGAO, RLSA/RL01 Pack Verify (Document)
AJRLGAO, RLSA/RL01 Pack Verify (Fiche)

AK-C6S4A-MA
AL-C6S5A-NA

AJRLGAO, RLSA/RL01 Pack Verify (Paper tape)
AJRLGAO, RLSA/RL01 Pack Verify (DECtape)

B-43

Table B-ll RIB/RLOt Diagnostic Kits
Part Number

Contents

ZB233-RB
ZB233-RZ
ZB233-PB
ZB233-FR

Documentation and paper tape
Documentation only
Paper tape only
Microfiche only

There are six free-standing diagnostic programs for the RL8/RL02 subsystem, plus a module for use
with the DECX8 System Exerciser. They are availabble in kit form (Table B-12) or as individual components (Table B-13). The Diskless Controller Test (AJRLACO) is simply Revision C of the RLOI test
and can test a subsystem with either RLOI or RL02.units. The other diagnostics test RL02-based systems only.

Table B-12 RLSA Diagnostic Kits
Part Number

Contents

ZF241-RB
ZF241-RZ
ZF241-PB
ZF241-FR
ZF241-PH
ZF241-RH

Documentation and paper tape
Documentation only
Paper tape only
Microfiche
RL02
RL02 and documentation

B.tO USE OF THE M9312 BOOTSTRAP WITH AN RLtl SUBSYSTEM
The M9312 module is used on many PDP-II UNIBUS systems to provide bootstrap capability as well
as other functions. The module has five IC sockets for ROM chips, four of which are reserved for peripheral bootstrap programs. There are several ROM chips available for the different peripheral devices, and an M9312 is configured by selecting the appropriate chips for the particular system on which
it is used.
The RL subsystem bootstrap program is contained in ROM chip number 23-751A9. This chip can be
ordered individually and is also available in kit MRl1-EA, which consists of an M9312 module plus all
the available ROM chips.
An RL system disk can be booted by a command to the console emulator (a program that is a feature of
the M9312). The device mnemonic for the RLII is DL or DLn, where n is the unit number (0 through
3).

B-44

Table B-13 RLB /RL02 Diagnostic Components

Part Number

Name

Item

AC-C656C-MA
AH-C657C-MA
AK-C658C-MA
AL-C659C-NA

AJRLACO RL8A Diskless Control Test

Documentation
Fiche
Paper tape
DECtape

AK-F362A-MA
AH-F363A-MA
AH-F364A-MA
AL-F365A-MA
AF-F362A-MO

AJRLHAO RL8/RL02 Seek/Function

Documentation
Paper tape
Fiche
DECtape
DECO/DEPO

AC-F366A-MA
AK-F367A-MA
AH-F368A-MA
AL-F369A-MA
AF-F366A-MO

AJRIAO RL8/RL02 Read/Write

Documentation
Paper tape
Fiche
DECtape
DECO/DEPO

AC-F370A-MA
AK-F371A-MA
AH-F372A-MA
AL-F373A-MA
AF-F370A-MO

AJRLJAO RL8/RL02 Drive Compat.

Documentation
Paper tape
Fiche
DECtape
DECO/DEPO

AC-F374A~MA

AJRLKAO RL8/RL02 Perf. Exer.

Documentation
Paper tape
Fiche
DECtape
DEPO/DECO

AC-F378A-MA
AK-F379A-MA
AH-F380A-MA
AL-F381A-MA
AF-F378A-MO

AJRLLAO RL8/RL02 Pack Verify

Documentation
Paper tape
- Fiche
DECtape
DECO/DEPO

AC-F382A-MA
AK-F383A-MA
AH-F384A-MA
AF-F38SA-MO

AXRLBAO DEC/X8 MOD RL8/RL02

Documentation
Paper tape
Fiche
DECO/DEPO

AK-F375A-MA
AH-F376A-MA
AL-F377A-MA
AF-F374A-MO

.B-45

APPENDIXC
TOGGLE-IN PROGRAMS

C.I HEAD SELECI10N PROGRAM FOR RLlljRLVlljRLVl2
The following program causes head 1 (lower head) to be selected (on unit 0) if the WRITE PROTect
switch is in and head 0 (upper head) to be selected if the switch is out.

1000
1002
1004
1006

012700
174400
012701
174404

Housekeeping

11'\.11'\.

lUlU

105710

Wait

1012
1014
1016
1020
1022
1024
1026
1030
1032
1034
1036
1040
1042
1044
1046
1050
1052
1054
1056
1060
1062
1064
1066
1070
1072
1074

100376
012711
000013
012710
000004
105710
100376
013702
174406
006302
010203
006303
105702
100405
005703
100357
012711
000021
000404
005703
100752
012711
000001
012710
000006
000745

Get Status Command.

Wait
Status Word

Check HS Bit
Check WL Bit
Equal, Loop
Set HS B~y
Go to Seek Command
Check WL Bit
Equal, Loop
Reset HS Bit
Seek Command
Loop

C-1

e.2 HEAD SELECfION PROGRAM FOR RLSA
The following program caqses head 1 (lower head) to be selected (on unit 0) if the WRITE PROTect
switch is in and head 0 (upper head) to be selected if the switch is out.
200
201
202
203
204
205
206

207
210
211
212
213
214
215
216
217
220
221
222
223
224
225
226
227
230
231
232
233
234

6600
1234
6604
6601
5203
6615
0232
7640
5217
6615
0233
7650
5201
7332
5224
6615
0233
7640
5201
7300
6603
7325
6604
6601
5227
5201
0100
0040
1002

Clear Controller
Get Status Command
Wait
First Word of Status
Check HS Bit
HS= 1, Go to 217
Second Word of Status
Check WL Bit
HS=WL, Go to 201
Second Word of Status
CheckWL
HS=WL, Go to 201
HS to Command REG A
Seek Command to Command REG B
Wait
Loop to 201
Constant
Constant

C-2

C.3 GET STATUS (WITH OR WITHOUT RESET) ON AN RLll/RLVll/RLV12 SUBSYSTEM
To accomplish this, it is necessary to:
1.

Deposit a 3 into DAR at 774404 (or 13 to Reset)

Deposit a 4 into CSR at 774400 (or 404, 1004, 1404 for units 1, 2, 3)

Wait for operation to be complete

Examine contents of MPR at 774406.

On some PDP-II systems this can be accomplished manually using the console. On other PDP-II systems it is necessary to run a program such as given below. Start at 1000 and when it halts, examine
memory location 1032.
To get status on unit 1, 2, or 3 modify location 1010 to 404, 1004, or 1404.
To reset drive modify location 1002 to 13.
1000

012737

1002
1004
1006
1010
1012
1014
1016
1020
1022
1024
1026
1030
1032

000003
174404
012737
000004
174400
105737
174400
100375
013737
174406
001032
000000
000000

Get Status Conunand
Use 13 to Reset
Use 404, 1004, 1404 for Units 1, 2, 3
Wait
Move Result to Memory
Halt
Result

C-3

C.4 GET STATUS ON AN RL8A SUBSYSTEM
The following program will get status from unit O. To access unit 1, 2, 3 change location 212 to 1102,
1202, 1302.
Start the program at 200. At the first halt, the first byte of the status word is displayed in the accumulator. At the second halt, the second byte is displayed.
200
201
202
203
204
205
206
207
210
211
212

7300
1212
6604
6601
5203
6615
7402
6615
7402
5200
1002

Get Status
Wait
Get First Byte
Halt and Display First Byte
Get Second Byte
Halt and Display Second Byte
Jump to Start
Constant

C-4

C.S OSCILLATING SEEK FOR RLll/RLVll/RLV12
The following program will cause unit zero to perform an oscillating seek. To drive units other than unit
0, swap the unit number plugs or modify locations 1044 and 1054 to refle,ct the unit number in bits 8
and 9.
The number of cylinders involved is inserted into bits 15 through 7 and bit 0 is set in the switch register
before starting the programs at 1000. If no switch register is available, modify location 1012 from
177570 to 001060 and put the number of cylinders in bits 17 through 7 and set bit 0 in location 1060.
The common values for the switch register are:
Number of cylinders
(in decimal)

Value of Switch Register
(in octal)

1
85
170
255
511

000205
025205
052405
077605
177605

1000
1002
1004
1006
1010
1012
1014
1016
1020
1022
1024
1026
1030
1032
1034
1036
1040
1042
1044
1046
1050
1052
1054
1056

012706
001000
012700
174400
013701
177570
004537
001032
042701
000004
004537
001032
000767,
105710
100376
010137
174404
012710
000006
105710
100376
012710
000010
000205

Set Stack Pointer
Set Device Address into RO
Set Difference into Rl
Go Seek
Change direction bit in Rl
Go Seek
Loop Back
Wait
Seek

Wait
Read Header to kill time for SKTO
Return

C-5

C.6 OSCILLATING SEEK FOR RLSA
The following program will cause unit 0 to perform an oscillating seek. To drive units other than 0,
swap unit number plugs. Insert the number of cylinders into the switches before starting at location
200. The usual values for the switch register are: 1 cylinder=l, 85 cyl=125, 170 cyl=252, '255
cyl=377 and 511 cyl=777.
200
201
202
203
204
205
206
207
210
211
212
213
214
215
216
217
220
221

7201
6604
7604
4221
3225
1225
6603
7325
6604
4221
7307
6604
1225
1226
7500
5202
5203
0000

"'''''''
J:.J:.J:.

000.1

223
224
225
226

5222
5621
0000
4000

Reset
Get Number
Go Wait for Ready
Store number
Seek
Go Wait for Ready
Read Header to Delay for SKTO
Change Direction Bit
Check for Time to Restore
Loop to Start

Loop
Wait for Ready

££n1

Temp
Constant

C-6

APPENDIXD
RLll CONFIGURATION AND INSTALLATION CONSIDERATIONS

D.I SPC CONSIDERATIONS
The RLII is a small peripheral controller (SPC) but does not unconditionally fit into any SPC slot.
Early SPCs were always quad-height modules or combinations of smaller (single or dual) modules that
involved only four rows. Thus, the standard pin assignments applied only to rows C, D, E and F on a
hex-height backplane. Many new options, such as the RLII, are hex-height modules and therefore require that rows A and B be vacant since some SPC slots use rows A and B for UNIBUS cables or power
connectors. Some hex-height options require standard UNIBUS pinning on rows A and B and some
require Modified UNIBUS Device (MUD) pinning. In the case of the RLII, the only connections used
on rows A and B are the + 5v and ground. Thus, these rows can be either standard UNIBUS or MUD
pinning.
The early SPCs did not utilize direct memory access (DMA) data transfers to/from memory and therefore those signals were not part of the original SPC pin assignments. Some of the newer options, such as
the RLII, do utilize DMA transfers. There is a new pin assignment called SPC PRIME that includes
these signals. If the RLII is to be used in an older (non-SPC PRIME) slot then it is necessary to ensure
that the following signals are wired on the backplane.
•
•
•
•
•

Pin CAl - NPG In
Pin"CBI - NPG Out
Pin FJI - NPR
Pin CVI - AC LO
Pin CUI - +15v

If the slot has SPC PRIME pinning then another precaution must be taken. NPG continuity is maintained across an empty SPC PRIME slot by a backplane jumper from pin CAl to pin CBI. This jumper must be removed whenever a DMA-type option (such as an RLI1) is installed, and the jumper must
be added if the module is removed. This consideration is in addition to the normal bus grant continuity
card used in row D of all empty SPC slots.

D-l

D.l CONFIGURATION CONSIDERATIONS
When configuring a· UNIBUS system for the best priority assignments, two characteristics of a peripheral option must be taken into consideration. These are the peak word transfer rate and the TI time (TI
time is a function of the peak transfer rate and the silo size). The RLI1 has a peak transfer rate of 256
kHz (3.9 microseconds/word) and a TI time of 62.4 microseconds. These values dictate its position in
the priority scheme. The recommended priority scheme is listed below.
CPU
Memory
RKII/RK05
TMI1/TUI0
TCll/TU56
RLlljRLOl-RL02
RJS04
RM02
RJP04
RK6II/RK06-RK07
RPIIC/RP03
RJS03
TJU16
RFll/RSII
OBII
Other general configuration rules are listed below.
•

On a PDP-II UNIBUS, a combination of two disk subsystems and a tape or floppy disk subsystem is considered maximum.

•

On a POP-ll/70 system, one UNIBUS disk subsystem is considered maximum if there are
MASS BUS disks.

•

A disk subsystem should not be installed beyond a bus expander.

0-2

Reader's Comments

RLOI/RL02
TECHNICAL MANUAL
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