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EK-LEP04-OM-001

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Document:	RD52-D, -R Fixed Disk Drive Subsystem Owner's Manual
Order Number:	EK-LEP04-OM
Revision:	001
Pages:	84
Original Filename:

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Fixed Disk Drive
Subsystem

Owner’'s Manual

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EK-LEPO4-OM-001

RD52-D, -R

Fixed Disk Drive
Subsystem
Owner’'s Manual

Prepared by Educational Services
of Digital Equipment Corporation

1st Edition, March 1985

All rights reserved.
Printed in U.S.A.
The material in this document is for informational purposes and is subject to
change without notice; it should not be construed as a commitment by Digital

Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that may
appear in this document.

NOTICE: This equipment generates, uses, 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 case the user at his own expense
may be required to take measures to correct the interference.

The following are trademarks of Digital Equipment Corporation.

diglit]a]l

MASSBUS

RSTS

DEC
DECmailer

MicroPDP-11
MicroVAX

RSX
RT

DECmate
DECservice
DECUS
DECwriter
DIBOL

MicroVMS
PDP
P/OS
Professional
Q-Bus
|

UNIBUS
VAX

Rainbow

VMS

VT
Work Processor

Contents

Preface

INStAllAtION Leniiiiiiei ettt
e e e enaas 1-1
| 55T o 16 13 (o1 5 10 s NP 1-1
Unpack the RD52-R (Rack Mount) Subsystem ........ccccooeiviiiiiiiiiiiiiieeinnnn. 1-2

Install the RD52-R Subsystem and Front Cover .......oovvvvueiviiiieeeiiiieeeeeennnnn. 1-3
Unpack the RD52-D (Desktop) Subsystem ...........uvvvveviiiiiiiiiiiiiiceeeeeeeeeenee. 1-4

Connecting an RD52-D, -R Subsystem to a MicroPDP-11 or MicroVAX ...... 1-5
Connecting One or Two RD52-D, -R Subsystems to a PDP-11/23 PLUS ..... 1-6
Identify the Power Cord and Check the Voltage Switch ......ccoovvvuieeeeeeenenenn.. 1-7
Connect the Power Cord to the Subsystem and the Wall Outlet ................... 1-8

Set the Power Switch of the Computer and the Subsystem to 1 (on) ........... 1-8
Formatting a MicroPDP-11 System ........cooviiiiiiiiiiiiiieiiiiieccceee
e 1-9

RUN the USEr TS ovuuiieiiieeeeeeeee

et ee e e et e e e aenaas 1-11

Formatting Help and Information .........ccooooueiiiiiiiiiiiiiiiee
e, 1-12

Formatting MOAES ....uuueiiiiiiiiiieieeeeiceece
et
e ettt eeeeeeans 1-13
Formatting a MICTOVAX SYSEEIM oovvuuuiiiiiiiiiiieeieieeieeee ettt

e e e aeveaens 1-14

OPEIALION ceiiiieeiiieeeeeeeiee ettt
ettt ettt et eeeeeeeeeeeaeeeseaessaasaaeeeseennnnnsnens 2-1
INEOAUCTION ...
e e e, 2-1
Front Panel ........cooiiiii
e e e e e e e e eeee e eeeeee
iii 2-2

Rear Panel ASSEMDIY ......coooovii
e
iiiiiiiieieeee
e eee
ee 2-4

Care and Handling of the RD52 SubSyStem .........coeeeeoeeeeeeeeoeeeeeeeeeeeeeee, 2-5
Technical DesCriPtion .......cooieeieeieieeee
e
e e e e e e e e e e e 3-1

INELOAUCTION .iiiiii

et e e e e e
eee s 3-1
PhySiCal FEATUIES ...t
ee eeee eeeeeeeeee
eneeeeeeees 3-2
OPErating FEALUIES ......uuuviiiiiiiiieeieeeeeeeeeeeeeee
e 3-3
Environmental ReqQUIrEmMEents ...........euueueeeeeeieeeeeeeeeeeeeeeeeeee e, 3-3
POWET SUPDIY «.oeeeeeieeeeeeeeeee
e
e e e,
eeee 3-3

DC CoolNG FaN ..couiiiiiiiiiii
e
e e e e e e e e e, 3-4
Front Panel ..ottt
e e e, 3-4

Rear Panel ... 3-5
lii

Contents

Logical Unit Number (LUN) ....cooiiiiieieieeeeeeee

e 3-7

(070)011240
F 1 10 o NSRRI 3-7
System Controller and Cable OPtiOnS ......ceeeevveeueeieeeeeeeeeeeeeee
e eeeeeeeeeeeeeens 3-8

MicroPDP-11 and MICTOVAX ...t
e e 3-9

MicroPDP-11 and MicroVAX Configuration .........eeeeeeeeeemeereeeeereeeireeeeeeennnnne 3-10
PDP-11/23 PLUS ..ottt
e e e e e e e e 3-11

PDP-11/23 PLUS Configuration .........ccccoieevvreeeerniieiieeieeerereeeeiieeeseeeeeeeeeesnnnnns 3-12
TTOUDIESROOLINE ..ot
e e e e e e e e e eenaeenens 4-1
| N qe Yo L1 (ot (o) 1

4-1

Troubleshooting Tables .......covueniiiiiiiiiiiieee

e 4-2

Removal and Replacement Procedures .........ceeviiieiiiiiieiiiiiiiieiieeieeeeeeev 4-3
RD52 Fixed Disk Drive Removal .........cooovvniiiiniiiiiiiiiiee

e 4-4

Main Printed Circuit Board Removal ........ccooueeiiviiniiiiieiiecceeeeeee 4-8
Fixed Disk Drive Installation ..........cc.ooiiiiiiiiiiiiieieeeeee

Power Supply Removal .........cooueiiiimiiiiiiie
Fan Assembly Removal ......cooouviieiiiiii

e 4-13

e 4-15
et 4-16

Appendix A
Logical Unit Number Designation ..........ccccceeeveiiieennieeinnineenenn. A-1
Disk Unit Number Designation .........ccccooeueeiiieeiiiiiiiereriieeeeieeeeeeeeeeieeeeeaeeeens A-1
Logical Unit Numbers (LUN) ....coovvirieeieeeeee
e A-2

Appendix B
System SpecIfiCationS ........ceeeeevveiieiiiiieeiie
e e e e e eenanns B-1
| EN A g0) 1118 1<) oL RPN B-1
Subsystem Dimensions ...........ccceeeevvneeevnnnennn. ett
et e et e et raeenaeerneernnaas B-1
RD52 Fixed DiSK DIIVE .....ooeeeiiieieeeeee
ettt eva e e e e B-2
oA
LS RN1310)
o) AU
UPUPPRR B-2

- Appendix C
Connector Pin Numbers and Signals .......ccoovvveiiiiiiiiiiiiiieneneens C-1
J1, J2, and J3 CONMECLOTS ....coeveneiiiieieieeeieeeeerieeeeeetee
e e st s e eeraneeeeeeaaaeeennaans C-1
Power Supply COMNECLOIS .......uuuiiieieieeeieieeeeeeeeeeereeee
e e eeeeie e e crean s esaanaes C-3
Appendix D

Related Documentation .........c...eeveeeereeeeiiiireiiereeieerreeeeeeeeenneees D-1

Appendix E
SErviCe OPLIOIS ..u.ceiiieeierieiriieeeeeeeeeeiieeineeeeeeeeereererennasenesseeeeees E-1
ONSIEE SEIVICE .eeeeeeieeeeeeeeeeeeeetueerereteeereseeesssaeesssesessnsessnnesesnnsesemnssssssnssensnnnens E-1
CaATTY-IN SEIVICE .eoieiiiiieieeeeee e
e e er e e ee e e
e e e e e eeeeenenn e e e s s e e eeerasnnnnns E-1
DIECINAIET ..ottt ettt e eetreeeeeeaeeeesanseeessesnasssssnaaesnsssasaranssssessnsennes E-2
PEr Call SEIVICE «.cceevieeeeeeeeeeeeeetttcceeeeeeeeeeeraasnneeeeeeseeasneessnsassasseseeeeeenmnnnsnnnes E-2
Per Call ..........e eeeeeeueeeeeetnueteerarattnn__—.teraaneterannaternraateraanetearnnnneenenseneerenn E-2
On-Site Per Call SEIVICE ....oovveeeeeeeeeeeeeee
e
te e e e e e e reeaeea e E-2

Contents

Carry-In Per Call SEIVICE ....ccccvoueiiiieeeeeieeiiricie e E-2
Digital International Field Service Information Numbers ............cccoccooiiii E-3

| E3 Vs o> TR TT TS U RO Index-1
Figures

1-1
1-2
1-3
1-4

1-5
1-6

Unpacking the RD52-R (Rack Mount) Subsystem ..........cccccoomnininiceee. 1-2
Installing an RD52-R Subsystem in a Rack Mount Assembly ................ 1-3
Unpacking the RD52-D (Desktop) Subsystem ..........cccooviiiiiiiiiniiiinneen 1-4

An RD52 Subsystem Connected to a MicroPDP-11 or
et eenceaa e 1-5
iiiieeeie
et evee
MicroVAX (BA23 ENCIOSUTE) ceuuviieiiii

One RD52 Subsystem Connected to a PDP-11/23 PLUS (H349) .......... 1-6
Two RD52 Subsystems Connected to a PDP-11/23 PLUS (H349) ........ 1-6

1-7

Identify the Power Cord and Check the Voltage Switch ........................ 1-7

2-1
2-2

| O o) 1 A oz 1 11 TR OO 2-2
Rear Panel ASSEMDIY ....uviiviiiiiiiiiiiee et 2-4

3-1
3-2
3-3
3-4
3-5
3-6
37
3-8

Desktop and Rack Mount Subsystems ..........cccooiiiiiiiiimiiiiimmiiiiannns 3-2
Front Panel Switches and Indicators .......coeevviiiiiiiiiiiiiireeeeeceeene, 3-4
e ee et e e e ae et e an e e e s eaeenaeaans 3-5
REAT PANEL ..ottt
i 3-9
BA23 Patch and Filter Panel ......coouveniieiii
One RD52 Subsystem With a BA23 Enclosure ...........ccooeviiieiiiiiiiinn.n. 3-10
PDP-11/23 PLUS H349 Distribution Panel ..........ccccccceviin, 3-11
One Subsystem Add-On for a PDP-11/23 PLUS .....ccccccciiiiiiiiiins, 3-12

4-1
4-2
4-3
4-4
4-5
4-6
4-7

Removal from Rack Mount HousSing .......c.covvvveiriiiiieriiiiiicieniiiinecinnn, 4-5
Removal from Desktop HouSIng ........ooeveniiiiiiiiiiei
i 4-5
Sliding the Fixed Disk Drive Forward ...........ciieeiiiiiiiiiiiiiiiiiii, 4-6
Remove the Power Cord and Drive Cables .......cccooeviiiiiiiiriiiiienieiineeee. 4-7
RD52 Disk Drive Serial NUMDET ...coouvivveiiiiiieeeie
et 4-8
Remove the Slide Mounting Plate ..........oooiiiiiiiiiiiiiiii, 4-9
Remove the 2-Pin Connector and SCIeWS ......cccovvviieeirieiemininrereneneeeennnen 4-10

4-8
4-9
4-10
4-11
4-12
4-13

Remove the Front Bezel ......oovneiiieiiiiiee
e 4-10
Remove Phillips Screws from Heatsink ...........ccoooieviiiiiiiiiiiiiiiniiinn 4-11
Remove the MPCB ...ttt
e e e e v e e e een 4-12
Set JUMPET CHP oueeiiiiiieiieeeeee
et eeee e e e e s e erene e e renn e 4-13
RD52-D, -R Subsystem Groove and Channel Guide ...............ceeeereennnnnes 4-14
Power Supply, Component Side VIEW ........ccoooviiiiiiiiiiiiiiiiiiniceecceeeeeeeeeee 4-15

Two Subsystem Add-Ons to a PDP-11/23 PLUS ......ccccccccin, 3-13

Contents

Tables
2-1
2-2

Control Panel Switch, Buttons, and Indicator .........oovvooeoeooooooeo 2-3
Rear Panel CompOnents ..........oooueeeeeeeoeeeeeeeeeeeeeeeeeeeeeeeeeeee 2-4

3-1

System Controller Options and Kit .......ccoveeoeeeeeeeoeeeee oo, 3-8

3-2
4-1

4-2

A-1

A-2
A-3

Cable OPLIONS ..o

e e 3-9

Basic Troubleshooting Procedure ...........ooooeoeeeeeeoeeeeeeeeeeeoeeoeee 4-2

RD52 Subsystem FRUS .....ooovviieeeeoeeeeeeeee et t————————— 4-3

Disk Unit DeSignations ........coeeceoeeeeeoeeeeeeeeoeeeeeeeeeeeeeeeeeeeeee A-1
RQDX1 Standard Logical Unit Number Configuration ..............o.o.o...... A-3
RQDX1 Logical Unit Number Jumper Configuration Choices ............... A-3

A-4

RQDX1 Logical Unit Number Jumper 4 Format .........ocovoomeoooeooeonn. A-4

B-1

General Environmental ReqUirements ........o.veeeeeeeeeeoeeeeoeeeooeeooeeo B-1

C-1

Connector SINAIS ........oouiiiuiieeeeeeeee e C-1
AC Power Input CONNECLOLS ...ooueeeeeeeeeeeeee oo, C-3

C-2
C-3
D-1

DC Power Output CONNECLOTS ....eeoveeeeeeeeeeeeeeeeeeeeeeeeeeeee oo, C-3
The RD52 SubSystem LiDIary .....coceeeeeeeeeeeeeee e, D-1

Preface
You can use your free-standing RD52-D (desktop) or RD52-R (rack mount) subsystems as an add-on to MicroPDP-11, MicroVAX, PDP-11/23 PLUS, and other Q-Bus

systems. You can easily attach the subsystems to an existing system or incorporate
them in new designs.

Chapter 2, Operation, describes the function of the subsystem control panel
switches, buttons, and indicator lights. Refer to your software documentation for

information on how to use the subsystem with your system.
These subsystems operate with the RQDX1 RD/RX module installed in the host

computer. Chapter 3, Technical Description, discusses the module(s) and cables
necessary to prepare the MicroPDP-11, MicroVAX, and PDP-11/23 PLUS systems.

NOTE

Only qualified service representatives should install the necessary boards and cables in the host computer. Refer to the

RQDXT1 Controller User’s Guide and 11C23-UE/11C23-UC RD52
Installation Guide for further information.

Your RD52 fixed disk drive subsystem is a delicate precision instrument and subject to damage if handled improperly. It will give you good, reliable service if you

observe the following precautions:
e

Follow instructions carefully when installing your RD52 fixed disk drive
subsystem.

Do not drop or bump the fixed disk drive. The maximum impact a fixed disk can
withstand is a drop of 15 cm (6 in) to a hard surface.

e
®

Use care when you move your RD52 subsystem.
Pack your fixed disk drive in its original packing material to prevent damage

from shocks and vibrations when transporting or shipping your subsystem.

Preface

If you need help:

Refer to Chapter 4, Troubleshooting.

For hardware questions, call your service representative.

For software questions, call your sales representative and ask for an access code
number for the Digital Phone Support Center (PSC).

VIl

Installation
INTRODUCTION

Place the RD52-D, -R subsystem where it is to be used.
Allow space around the unit for air circulation and servicing.
Place the unit away from heaters, photocopiers, and direct sunlight.

Minimize static by placing the unit away from busy office corridors.
Keep the area free from dust and other abrasive materials.
Keep the unit away from magnets and equipment that generate magnetic fields,
such as motors, transformers, and terminals.
To install an RD52-R, start at page 1-2.
To install an RD52-D, start at page 1-4.

1-1

Installation

UNPACK THE RD52-R (RACK MOUNT) SUBSYSTEM
If any item is missing or damaged:

(Contact your sales representative.

(Contact your delivery agent.

Prepare the H9302 rack mount kit, which is shipped separately. Refer to documentation provided with the kit for instructions.

DOCUMENTS /
SHIPPING BOX

CABLING(2)

I/O CABLE
17-00484-01

POWER CORD

RD/RX-R

Figure 1-1

Unpacking the RD52-R (Rack Mount) Subsystem

The RD52-R subsystem is shipped completely assembled and ready to install in an
H9302 rack mount assembly.

1-2

Installation

INSTALL THE RD52-R SUBSYSTEM AND FRONT COVER

fooo

;*eiooooea

)oooooeoeefi

)

The front cover is provided with the H9302 rack mount kit.

Figure 1-2

Installing an RD52-R Subsystem in a Rack Mount Assembly

Go to page 1-5 to continue.

1-3

Installation

UNPACK THE RD52-D (DESKTOP) SUBSYSTEM
If any item is missing or damaged:

(Contact your sales representative.

(Contact your delivery agent.

CABLING(2)

DOCUMENTS

I/O CABLE
17-00484-01

AC POWER CORD

Figure 1-3

Unpacking the RD52-D (Desktop) Subsystem

The RD52-D subsystem is shipped completely assembled and ready to connect to
the computer system.

1-4

Installation

CONNECTING AN RD52-D, -R SUBSYSTEM TO A
MicroPDP-11 OR MicroVAX

Connect the I/O signal cable to the J2 connector of the RD52 disk drive and to the
50-pin connector in the computer patch and filter panel assembly.

®
C

]

[
{

{

Figure 1-4

]

FROM

SYSTEM

HOST

—

—J

‘

An RD52 Subsystem Connected to a MicroPDP-11 or
MicroVAX (BA23 Enclosure)

1-5

Installation

CONNECTING ONE OR TWO RD52-D, -R SUBSYSTEMS TO A
PDP-11/23 PLUS

Connect the I/O signal cable to the J1 connector of the RD52 subsystem and to the
50-pin connector in the computer patch and filter panel assembly.

TM~

I-

—

)
| —
L

I
L

]

HOST

SYSTEM

—

Figure 1-5

TO J1

—1

]

—]

—

One RD52 Subsystem Connected to a PDP-11/23 PLUS (H349)

RD51/52-D,-R

RX50-D,-R

(

FROM
HOST

SYSTEM

@ 22

[JS{ o ==
®

FROM

HOST
SYSTEM
®

)

Figure 1-6

—

Two RD52 Subsystems Connected to a PDP-11/23 PLUS (H349)

Refer to Chapter 3, Configuration for a more technical discussion of considerations
involved when installing multiple RD52-D, -R systems.

1-6

Installation

IDENTIFY THE POWER CORD AND CHECK THE VOLTAGE SWITCH
Make sure that the plug on the power cord matches the wall outlet.
CAUTION

An incorrect voltage setting can damage your subsystem and
your computer.

115V

POWER CORD

220 V/ 230 V/ 240 V
..

220 V/ 230 V
240 V

[

BT &
/]

Figure 1-7

Identify the Power Cord and Check the Voltage Switch

1-7

Installation

CONNECT THE POWER CORD TO THE SUBSYSTEM AND THE
WALL OUTLET

If you are adding an RD52-D, -R subsystem to a PDP-11/23 PLUS, connect the
power cord to the power controllerin the rack.

SET THE POWER SWITCH OF THE COMPUTER AND THE SUBSYSTEM
TO 1 (ON)
Make sure the Ready button on the subsystem’s control panel is in the out position
(lit - green). After 15 seconds, the system displays its start-up message.
Before you can test the system and use the RD52 subsystem, you must first
format it.

NOTE
Formatting the RD52 subsystem destroys any files that are pre-

sent on the disk drive. If you think that files exist, make a

backup copy before you proceed. Write-protect any other
RD51/RD52 fixed disk drives that are present. Refer to your
software documentation for instructions.

Your new subsystem becomes DU1 (disk unit 1) if the cable is connected to the J2
connector and you have a MicroPDP-11 or MicroVAX with an internal RX50 and
an RD51 or RD52 fixed disk drive.

Refer to Appendix A, Table A-1, for the disk unit designation for any other
arrangement or for a RD52-D, -R subsystem installed on a PDP-11/23 PLUS.

Make sure you label the subsystem. Drive unit labels come with the base computer
system.

To format an RD52 subsystem installed on a MicroPDP-11 system, go to page 1-9.
To format one installed on a MicroVAX system, go to page 1-14.

1-8

Installation

FORMATTING A MicroPDP-11 SYSTEM

(User responses are in COLOR.))
Find the Field Service Test Diskette 4 (CZXD4DO0) and insert it in drive 1. Press
the Return Kkey.
Type R ZRQB?? after the “.” (period) prompt. Press the Return key.
This runs the diagnostic program. The question marks allow any revision of the
program to be used. When formatting an RD52 subsystem, make sure you have

Version 5 or later. Earlier versions format the RD52 subsystem as though it is an
RD51 subsystem (11 Mbytes).
A response similar to the following appears on the terminal.
DR>

You must respond to this prompt with a command to run the program.

Type START. Press the Return key.
Then answer the following questions.

CHANGE HW (L)?

This is a program that answers hardware questions and is prebuilt to format unit 0
with default answers.

Type N (no). Press the Return key.
CHANGE SW (L)
This program answers software questions.

Type N. Press the Return key.
ENTER DATE (in mm-dd-yy format) (A)?

Type the current date. For example, 09-15-84. Press the Return key.
ENTER UNIT NUMBER TO FORMAT <0>
This is either drive unit 0 or 1. Type 1 if you are formatting an installed RD52
subsystem. Type O if you are formatting an internal RD52 subsystem or a single

add-on to a PDP-11/23 PLUS.
Type 1 or 0. Press the Return key.

1-9

Installation

USE EXISTING BAD BLOCK INFORMATION?

This activates the reformat mode — reads the manufacturer’s information on the
disk and cylinder.
Type Y (yes). Press the Return key.

NOTE

The program takes approximately 12 minutes to complete. The N
(no) response takes approximately 30 minutes to complete.

CONTINUE IF BAD BLOCK INFORMATION IS INACCESSIBLE
Type Y. Press the Return key.
ENTER A NONZERO SERIAL NUMBER:

Type your serial number (located on the back panel of your unit). Press the
Return key.

The system displays a message similar to the one below.
FORMAT BEGUN

After about 12 minutes, the system displays a completion message similar to the
one below.
FORMAT COMPLETED

Remove the diskette.

If formatting is not successful, the system displays an error message when the
error occurs. Refer to page 1-12 for help.

1-10

Installation

RUN THE USER TEST

Refer to your specific computer system owner’s manual for instructions.

NOTE

Version 5 and later of the MicroPDP-11 User Test supports the
addition of an RD52 disk drive.
Upon successful completion of the User Test, the system displays a message similar to the following one.

TESTING OF THIS SYSTEM IS NOW COMPLETE.
You have successfully installed, formatted, and tested your RD52-D, -R disk drive
subsystem.
If you encounter any errors, refer to the Troubleshooting section of your specific
computer’s owner’s manual.

Installation

FORMATTING HELP AND INFORMATION

The following is a list of error messages generated by the formatter, their probable

cause, and what to do. Errors 1, 2, and 3 occur almost immediately; error 4 can
appear up to about 1 minute after starting; error 5, from 1 to 10 minutes; and
errors 6 and 7, after 10 minutes.
(1) UNIT IS NOT WINCHESTER OR CANNOT BE SELECTED

Unit selected is either unavailable or is an RX50 disk drive. Check to make sure
the Winchester is not write-protected.

Make sure the switch on the bottom of the disk drive is set correctly.
(2) INITIAL FAILURE ACCESSING FCT

The format control table cannot be read.

Try reconstruct mode; see page 1-13 for instructions. If that fails, replace the disk.
(3) FACTORY BAD BLOCK INFORMATION 1S INACCESSIBLE

Occurs only in reformat mode when bad block data is not accessible.
Run in reconstruct mode; see page 1-13 for instructions.

(4) SEEK FAILURE DURING ACTUAL FORMATTING
There is a hardware error.

Check for hardware problems.
(5) REVECTOR LIMIT EXCEEDED
The disk is bad.
Replace the disk.

(6) RCT WRITE FAILURE

Write to disk failed after successful formatting and surface analysis.
Check write-protect status.

(7) FAILURE CLOSING FCTS

Disk is marked as unformatted.

1-12

Installation

FORMATTING MODES

Three questions select the type of format mode which is run: reformat, restore, or
reconstruct. In order, the three questions are:
1.

Use existing bad block information?

Down-Line Load?

Continue if bad block information is inaccessible?

The first two questions determine which mode is run. The second question does
not appear unless the first question is answered N. An answer of N (no) to question

3 causes the diagnostic to stop and print an error if a bad spot is found.
Reformat Mode — If your answer to question 1 is Y, no further questions are
asked. The format program reads the manufacturer’s bad blocks from a block on
the disk. It then formats all of the disk except for these bad blocks. This takes

about 12 minutes. If it fails, try restore mode.
Restore Mode — If your answer to question 1 is N, the program asks you to type

in a list of the bad blocks. It then formats all of the disk except for the bad blocks
you specify. You can input the bad blocks using the list that comes with the drive.
It asks you for the serial number. This number is found on the top of the RD52
disk drive. The program only allows you to type in the last 8 dlglts of the serial
number. Restore mode takes about 15 minutes.

Reconstruct Mode — If you answer N to both questions 1 and 2, the program
searches the disk and identifies all the bad blocks. It does not use the manufacturer’s bad block information. It then formats all of the disk except for the bad
blocks it identified. This takes about 30 minutes.

1-13

Installation

FORMATTING A MicroVAX SYSTEM

Refer to your system technical manual for instructions when formatting an
RD52-D, -R subsystem installed in a MicroVAX II.

(User responses are in COLOR )
Find the diagnostic diskette labeled MicroVAX Diagnostics 2 of 2, and insert it in
drive 1. Press the Return key.
Type B/10 DUAZ after the system prompt. Press the Return key.

This boots the diagnostic test. DUA2 is the disk drive unit designation of drive 1 of
the RX50 diskette drive. After the diagnostic supervisor boots, the console termi-

nal displays a header message identifying the version of the diagnostic supervisor.
This prompt is displayed.
DS>

Type ATTACH RQDX1 HUB DUA 772150. Press the Return key.
772150 1s the RQDX1 module address.
Type ATTACH RD52 DUA DUAL1. Press the Return key.
If you are formatting an RD51, type RD51. DUALI is the disk unit designation
number of the installed subsystem.

Type SELECT DUA1. Press the Return key.

Type RUN EHXRQ/SECT=FORMAT.

Press the Return key.

The console terminal displays a message similar to the following.
.PROGRAM:RQDX1 Functional Test, ZZ-EHXRQ, revision 1.0, 24 tests at

08:55:03:12 testing DUAT
This identifies the disk unit to be formatted.
Then answer the following questions.
ENTER TODAY'S DATE (DD-MM-YY)

Type the current date. For example, 09-NOV-84. Press the Return key.

Installation

ENTER VOLUME SERIAL NUMBER (NNNNNNNN)

Type your serial number. Enter a number from 1 to 8 digits long. This number
may be one you invent, or it may be the actual serial number of the disk. The
serial number is located on the white bar code label on the fixed disk. Omit all
letters from the serial number as the formatter does not accept any letters.
The format program displays a warning prompt.

PREVIOUS DISK CONTENTS WILL BE DESTROYED, IS THIS CORRECT?
Type YES. Press the Return key.

A NO response cancels the formatting program and returns you to the DS>
prompt.

The system displays a message similar to the following.
FORMAT BEGUN

Formatting an RD51 subsystem takes about 12 minutes; formatting an RD52 subsystem takes about 30 minutes. When the disk has been formatted, the system
displays a message similar to the following.
FORMAT COMPLETE

Information is also provided about the number of blocks on the disk that were
revectored and the number of bad blocks that were found.

After these messages the system displays an end-of-run message followed by the
DS> prompt.

Refer to your system’s owner’s manual for instructions to test the RD52-D, -R
subsystem.

Operation
INTRODUCTION
This chapter contains an overview of the operation of the RD52 subsystem. It is
intended as a quick reference for the user. An in-depth explanation of the subsys-

tem can be found in Chapter 3, Technical Description.

2-1

Operation

FRONT PANEL

The RD52 subsystem is controlled by using the on/off switch and the Ready and
Write-Protect buttons. Several indicator lights show the ready, write-protect, and
voltage status of the subsystem. Figure 2-1 shows the front panel and Table 2-1
summarizes the operation of the on/off switch and the control buttons, and explains
the function of the indicator light.

LED RD52 DRIVE

WRITE-PROTECT
RD52 DRIVE

DC LED

READY

ON/OFF

HgSgupEpEpbplipipiiy

_V;U"_f\_—

([afil}al]

Figure 2-1

Front Panel

Operation

Table 2-1
Switch

On/Off

Control Panel Switch, Buttons, and Indicator
Position

Function

Switches the subsystem on.

(lit - red)
0

Switches the subsystem off.

Button

Position

Function

Ready

Out

The subsystem is ready to be used for

(lit - green)

information storage by the system software.

Disables the subsystem. In effect, the
subsystem is turned off.

Write-

Out

Protect

Out is the normal operating position. System
software is able to read and write

information on the disk.
In

Prevents the system software from writing

(lit - yellow)

on the fixed disk. Write-protect the disk

when making backup copies of the disk’s
contents. Write-protect the disk when
running tests to prevent accidental erasure
if the wrong diagnostic program is chosen.

Indicator
DC

Function
This indicator is lit (green) when the power supply is generating
the correct dc voltage.

Operation

REAR PANEL ASSEMBLY

The rear panel contains three multi-pin connectors, an ac power outlet, voltage
switch, ac circuit breaker, and fan exhaust (Figure 2-2). Table 2-2 describes the
use of the three connectors.

AC LINE

PRIMARY VOLTAGE
SELECT SWITCH

Riiniainininisiainl

L—"“_L_P‘_P‘LP‘%—"LLL—L_—L—_

—_—

CIRCUIT BREAKER

PRIMARY VOLTAGE
INPUT

Figure 2-2

Table 2-2

Rear Panel Assembly

Rear Panel Components

Component

Function

Description

Connectors

Input

Receives signals from the computer or another

J1 and J2

Connector
J3

subsystem. Only one of these connectors can

be used at one time on a subsystem.

Output

Connects two subsystems together. A cable
connected to J3 is attached to J1 or J2 of an

adjacent subsystem. Only a PDP-11/23 PLUS
accommodates more than one subsystem.

2-4

Operation

The RD52 subsystem is a 133.4 mm (5.25 in) fixed disk drive enclosed in either a
free-standing or rack mounted housing. Each RD52 subsystem contains its own
power supply and fan and stores 31 Mbytes of information. Information is stored
magnetically in much the same way that sound is recorded on audio tape. Information stored on a fixed disk can be erased and replaced with new information.
CARE AND HANDLING OF THE RD52 SUBSYSTEM
e Never bump or drop the subsystem.

e Back up all files on a regular basis. Refer to your system software documentation for backup instructions.

e Write-protect the disk when making backup copies onto diskettes or tape to
prevent accidental loss of information.

e Write-protect the disk when you test the system. This prevents accidental loss
of information if you choose a wrong test.

e Keep the fixed disk drive away from direct sunlight, heaters, photocopiers, and
X-ray equipment.

e Keep the unit away from magnets and equipment that generates magnetic fields,
such as motors, transformers, and terminals.

2-5

i
28

INTRODUCTION

This chapter contains two sections. The first section describes the following
attributes of the RD52-D, -R fixed disk drive.
Physical features
Operating features

Environmental requirements
Power supply
Fan

Front panel controls
Rear panel

Logical unit numbers

The second section discusses configuration requirements for MicroPDP-11,
MicroVAX, and PDP-11/23 PLUS systems using the RD52 subsystems, and
includes several typical configurations.

3-1

Technical Description

PHYSICAL FEATURES
The RD52 subsystem is a free-standing 133.4 mm (5.25 in) mass storage device.

You can use it as an add-on to MicroPDP-11, MicroVAX, PDP-11/23 PLUS, and
some other Q-Bus hosts. The subsystem can also be expanded into multiple drive
configurations. For both desktop and rack mount units, a simple cable connection
between contiguous subsystems enables the multi-drive arrangement (see Figure

3-1).
It is also a random-access storage device with four nonremovable disks as the
storage media. The 18-sector format has a total capacity of 31 Mbytes. Refer to

Chapter 1, Installation, for the formatting procedure.
Each RD52 subsystem consists of a mounting chassis that holds the fixed disk
drive, power supply, dc cooling fan, printed circuit board for external cable signal
distribution, and front and rear panels.

A. RD52 SUBSYSTEM,

DESKTOP MODEL
1. FRONT BEZEL

2. COVER
3. CHASSIS
4. REAR BEZEL

B. RD52 SUBSYSTEM,
RACK MOUNT MODULE

Figure 3-1

3-2

Desktop and Rack Mount Subsystems

Technical Description

Rack mount units must be mounted within an H9302 rack mount kit. The rack
mount kit, which ships separately, holds two subsystems side by side and fits a
standard 19-inch rack. Desktop units have a cover and front and rear bezels

already installed.
The subsystem operates with either 120 V (RD52-DA, -RA) or 240 V (RD52-DB, RB) primary power. Primary power is controlled by using the on/off switch on the

front panel. Refer to Appendix B for specifications.
The RD52 disk drive is a field replacable unit (FRU). Refer to Chapter 4,
Troubleshooting, for FRU procedures.

OPERATING FEATURES
The RD52 subsystem operates with the RQDX1 (M8639) RD/RX controller module

and RQDX1-E (M7512) extender module installedin MicroPDP-11, MicroVAX, or
PDP-11/23 PLUS systems.

The RD52 disk driveis fully supported by PDP-11 and MicroVMS software and is
compatible with the Digital Storage Architecture (DSA) Mass Storage Control Pro-

tocol (MSCP).
ENVIRONMENTAL REQUIREMENTS

Disk drives are susceptible to high humidity, shock, and radiated emissions. The
fixed disk drive can withstand a maximum impact of a drop of 15 cm (6 in) to a

hard surface. Refer to Appendix B for environmental and operating specifications.
POWER SUPPLY
The RD52 power supply uses either 120 Vac or 240 Vac primary power that is

selected by a switch (VOLT SEL) on the rear panel. The switch is factory set to

120 Vac (RD52-DA, -RA) or 240 Vac (RD52-DB, -RB). The power supply provides:

+12 A Vdc for the fixed disk drive

+12 B Vdc for the dc cooling fan

15 Vdc for the control logic

The +5 Vdc and +12 Vdc regulators are not adjustable.

The circuit breaker (CB) protection on the primary line includes protection to
prevent overheating of the disk media. Refer to Appendix B for power supply

specifications.

3-3

Technical Description

DC COOLING FAN

The dc cooling fan receives +12 B Vdc from the power supply. The fan attaches to
the internal side of the rear panel and pulls air from the front of the subsystem and
exhausts it out the rear.
FRONT PANEL

The front panel contains control switches, buttons, and indicators. Figure 3-2
shows the layout of the control panel.

LED RD52 DRIVE

LED SWITCH

WRITE-PROTECT

LED 45 vV

READY

AC POWER
SWITCH

RD52 DRIVE

Figure 3-2

Front Panel Switches and Indicators

The function of the switches and indicators is as follows:

e A rocker type switch labeled ON/OFF connects/disconnects ac power to the
internal power supply.

e The top (green) LED lights when the disk drive is ready to be used for information storage by the system software.

The Ready indicator is an LED pushbutton switch and is operator controlled.
The light goes out when the button is pushed in and indicates that the disk is

unavailable for read/write operations.

3-4

Technical Description

The middle (green) LED lights when dc power is present.

The bottom (yellow) LED lights when the disk drive is write-protected. The disk

can be read by the system software.
The Write-Protect indicator is an LED pushbutton switch and is operator controlled. The light goes out when the button is out. Information can be read and

written to the disk by the system software.
WARNING

AC power can be present within the chassis, even though the dc
(green) LED is not lit and/or the dc fan is not turning. Never

access the internal chassis without unplugging the unit from the
ac power source.

REAR PANEL
The rear panel contains the circuit breaker (CB) that fuses the ac power coming
into the subsystem and the primary voltage selection switch (VOLT SEL) set for
either 120 Vac or 240 Vac. It also contains the ac line connector that accommodates the ac power cord, the dc fan housing exhaust opening, and connectors J1

through J3. Figure 3-3 shows the rear panel layout.

AC LINE

PRIMARY VOLTAGE

CIRCUIT BREAKER

SELECT SWITCH

{

[

]

—J

]

PRIMARY VOLTAGE

INPUT

Figure 3-3

Rear Panel

3-5

Technical Description

The J1 connector of the RD52 subsystem responds to a DRV SEL 3 (L) signal on
the drive interface cable coming from the host. The system software labels the
RD52 DUO (disk unit 0) when this connector is used. Use this connector only when
you are installing an RD52 subsystem with a PDP-11/23 PLUS system. Refer to
Appendix A for a listing of DU (disk unit) designations and possible logical unit
number arrangements on the RQDX1 module.

The J2 connector of the RD52 subsystem responds to a DRV SEL 4 (L) signal on
the drive interface cable coming from the host. The system software labels the
RD52 DU1 when this connector is used. Refer to Appendix A for a listing of DU
(disk unit) designations and possible logical unit number arrangements on the
RQDX1 module. Also refer to your system’s technical manual for more information.
NOTE

Only one of these connectors (J1 or J2) on a single drive can be
used at one time.

The J3 connector connects two adjacent disk drive subsystems and carries the
signal out from the first subsystem attached to the host.
NOTE

The design of the RD52 subsystems allows a maximum total
cable length of 3.6 m (12 ft). If you have a total cable length in
excess of this, you may have problems.

Refer to Appendix C for a listing of J1, J2, and J3 pin number and signal names and

for a listing of pins and voltages on the 12-pin dc power ouput connector.

3-6

Technical Description

LOGICAL UNIT NUMBER (LUN)
The RQDX1 module supports a variety of peripheral devices, including multiple
arrangements of RD51, RD52, and RX50 disk drives.

The LUNs and the LUN jumpers may prove useful for future expansions. Jumpers
on the RQDX1 controller module select the LUN. These jumpers determine the
lowest LUN assigned to any RD51, RD52, and RX50 disk drives present in the
system.

when units (RD51/RD52 or RX50 drives) are added to or removed from the controller module. The system software automatically assigns disk unit numbers
(DUN) to any drives that are present.
The system software always assigns the lowest DUNs to any RD51 or RD52 fixed
disks that are present. For example, the system software assigns DUOQ to an inter-

nal fixed disk and DU1 to a fixed disk connected to the host computer through the
J2 connector on the subsystem. The system software then assigns DU2 and DU3

to the RX50 diskette drive.
Appendix A lists the standard LUN jumper configuration for the RQDX1 module
and the DUN assignment for various combinations of RD51/RD52 and RX50

drives. An RX50 diskette drive is two units.

CONFIGURATION
Configuring an RD52 disk drive into a particular system requires auxiliary equipment. The following describes the requirements and cables to use for each system

configuration.

3-7

Technical Description

SYSTEM CONTROLLER AND CABLE OPTIONS
Tables 3-1 and 3-2 describe the function of the components needed to configure

various systems. Refer to your system technical manual, the RQDX1 Controller
User’s Manual, and the 11C23-UE/11C23-UC RD52 Installation Guide for further
details.
Table 3-1

System Controller Options and Kits

Model

Description

RQDX1

The RQDX1 is the controller/interface for the RX50 and

(M8639)

RD51 or RD52 disk drive. It accommodates the MSCP
Q-Bus.

One controller handles up to four logical units with no
more than two RD52 subsystems per controller. The
controller is programmed
to assume an RX50 disk drive is

present. One RX50 disk drive is equal to two LUNs.*
RQDX1-E

(M7512)

This bus extender module and cable enable external disk

drives (RX50, RD51, or RD52) to connect to the
MicroPDP-11 internal controller-to-drive bus.
It allows either one external RX50, RD51, or RD52 disk

drive to be connected to the MicroPDP-11 controller,
depending on the RQDX1 configuration guidelines.

CX-RQDXE-KA

This is the cabinet cable kit for installing the RQDX1-E
extender in a BA23 enclosure (MicroPDP-11 or

MicroVAX).

CX-RQDX1-KC

This is the cabinet cable kit for installing the RQDX1
controller in a H349 enclosure (PDP-11/23 PLUYS).

The RQDX1 controller has a capacity of four logical unit numbers (LUNSs),
three of which are used internally by standard MicroPDP-11 and MicroVAX
systems. An internal RX50 disk drive uses two of these logical unit numbers.
An RD51-D, -R or RD52-D, -R subsystem can use the remaining logical unit
number. The system software labels these LUNs as disk unit numbers 0 to 3
(DUO to DU3).

The RQDX1 module accommodates only two fixed disk drives (see Appendix A).
The RQDX2 controller module accommodates up to four fixed disk drives.

3-8

Technical Description

Table 3-2

Cable Options*

Model

Description

17-00484-01

This 2.75 m (9 ft) host-to-external-drive interconnection
cable is a 50-pin “D”’ subminiature male to a 50-pin “D”
subminiature male, shielded, molded cable.

BC17Y 1]

This .3 m (1 ft) external drive-to-drive interconnection

cable is a 50-pin “D”’ subminiature male to a 50-pin “D”

subminiature male, shielded, molded cable.
The design of the RD52-D, -R subsystem allows a maximum total cable length
of 3.6 m (12 ft). If you have a total cable length in excess of this, you may

have problems.

MicroPDP-11 AND MicroVAX
Most MicroPDP-11 and MicroVAX systems contain inboard RD51-A or RD52-A
and RX50-AA drives and each system resides in a BA23 enclosure. Each system
also contains an RQDX1 controller. Before installing a subsystem, add an RQDX1-E

extender module and cable to the BA23 enclosure and connect the cable to the
patch and filter panel (Figure 3-4).
REMOVABLE
INSERT

1200

9600
19200

50-PIN CONNECTOR
EXPANSION SLOTS

Figure 3-4

BA23 Patch and Filter Panel

The BAZ23 patch and filter panel contains areas for use in system expansion. The

cabinet cable kits contain the necessary cabling for system expansion. This cabling
connects to a proper connector on the internal side of the patch panel. The subsys-

tem user can simply connect to the external connector on the patch panel. Table

3-1 discusses the cabinet kits and Table 3-2 lists the external cable options.
3-9

Technical Description

MicroPDP-11 AND MicroVAX CONFIGURATION

A BA23 enclosure (MicroPDP-11 and MicroVAX), prior to any add-on RD52 subsystem, contains the following:

1 RQDX1 controller
1 CK-RQDX1-KA cabinet kit
1 RD51-A (drive only) or RD52-A (drive only)
1 RX50-AA (drive only)
Figure 3-5 illustrates how to add a single RD52 subsystem to a MicroPDP-11 or
MicroVAX (BA23 enclosure). In this configuration, the BA23 enclosure already
contains two inboard drives (an RD51-A or RD52-A and an RX50-AA), an RQDX1

controller, and the internal cable (CK-RQDX1-KA).
INBOARD
DRIVES

PATCH AND FILTER
PANEL ASSEMBLY

BACKPLANE

RX50

RQDX1

CK-RQDX1-KA

INTERNAL

RD5 1

R
BUS

EXTERNAL

CABLE

— CABLE

QDX1-E

EXTENDER

—

RD52

2.75 m (9 ft)

CK-RODXE-KA

CK-RQDX1-KA

Figure 3-5

One RD52 Subsystem With a BA23 Enclosure

The requirements for adding the external RD52 subsystem are:
e

1 RQDX1-E bus extenderTM

1 CK-RQDXE-KA cabinet kit RD/RX controller extender BA23*

1 RD52-D subsystem
or

1 RD52-R subsystem with 1 H9302 rack mount kit

3-10

Order as one item with a system for factory RQDX1-EP integration.

Technical Description

PDP-11/23 PLUS

The PDP-11/23 PLUS does not contain any internal RD/RX disk drives. Before
adding a subsystem to a PDP-11/23 PLUS, an RQDX1 controller and cabinet key

cable (CK-RQDX1-KC) must be connected to the H349 distribution panel (Figure

3-6).

DRV11-J

DZV11

PARALLEL

(SYNC LINE INTERFACE)

LINE INTERFACE

DRV11-J

i
J2

CONSOLE

_]43

T
J9
|
|

L ______] -

UL (VI S

. —— DzV11

——

__________________ J12

J11

na_______]us

__________________ A
e

. —— DZV11

\
DZV11

Figure 3-6

DZv11

DzZzv11-J

PDP-11/23 PLUS H349 Distribution Panel

The H349 distribution panel contains areas for use in system expansion. The cabinet kits contain the cabling for system expansion. This cabling connects to a proper
connector on the internal side of the patch panel. The subsystem user can simply
connect to the external connector on the patch panel. Table 3-1 discusses the

cabinet kits and Table 3-2 lists the external cable options.

3-11

Technical Description

PDP-11/23 PLUS CONFIGURATION
To accommodate external add-on drives, a PDP-11/23 PLUS system requires an
RQDX1 controller and a cabinet key cable (CK-RQDX1-KC) connected to the H349
distribution panel.

Figure 3-7 illustrates a single RD52 subsystem add-on to a PDP-11/23 PLUS via

the H349 panel. This arrangement is suitable for a range of applications involving a
single add-on RD52 subsystem.

PATCH AND FILTER
PANEL ASSEMBLY
-

BACKPLANE

RQDX1

EXTERNAL CABLE

RD52

u;__— 2.75 m (9 ft) —————

CABINET KIT CABLE
(.76 m [30 in] FOR
H349 ENCLOSURE)
CK-RQDX1-KC

Figure 3-7

17-00484-01

One Subsystem Add-On for a PDP-11/23 PLUS

The requirements for adding this single external drive to the PDP-11/23 PLUS are
as follows:

1 RQDX1 controller

1 CK-RQDX1-KC cabinet kit

1 RD52-D subsystem
or

1 RD52-R subsystem and 1 H9302 rack mount kit

3-12

Technical Description

Figure 3-8 illustrates how to add two subsystems via the H349 panel.

PATCH AND FILTER
PANEL ASSEMBLY

RX50

—

BACKPLANE

RD52

RQADX1

L
(.76 m [30 in] FOR
H349 ENCLOSURE)

BC17Y 1J

EXTERNAL CABLE

RD52
CABINET KIT CABLE

]

@——— 2,76 m (9 ft)

————

17-00484-01

CK-RQDX1-KC

Figure 3-8

Two Subsystem Add-Ons to a PDP-11/23 PLUS

The requirements for adding two subsystems are as follows;

2 RD52-D subsystems or 2 RD51-R subsystems with 1 H9302 rack mount kit
or

2 RX50-D subsystems or 2 RX50-R subsystems with 1 H9302 rack mount kit
or

1 RD52-D or -R subsystem with 1 H9302 rack mount kit and 1 RX50-D or -R
subsystem

1 BC17Y-1J subsystem interconnection cable for two drive configurations

3-13

reed

Troubleshooting

INTRODUCTION

Troubleshooting is the process of isolating and repairing minor problems. System
diagnostic tests check almost every part of the system every time you turn the
system on. In addition, the MicroPDP-11 and MicroVAX User Test and field service diskettes contain extended tests for the circuitry and various devices that may
be installed on the system.

Troubleshooting of the RD52 subsystem generally involves running the system
User Test or running the program from the system boot/diagnostic ROM. Refer to
your system owner’s manual for User Test instructions. Refer to your system
technical manual for system boot/diagnostic ROM testing procedures.

4-1

Troubleshooting

TROUBLESHOOTING TABLES
From time to time you may encounter an error that is not related to system

diagnostic tests. Table 4-1 provides a basic checklist of some of these problems,
their possible cause, and ways to correct them. The corrective procedures listed

here are for minor problems.

NOTE
Major repair or replacement of any parts of this subsystem
should be carried out only by qualified repair personnel.

The procedure for replacing an RD52 subsystem starts on page 4-4.
Table 4-1

Basic Troubleshooting Procedure

Problem

Possible Cause

Corrective Action

System does not

Power cable is not

Plug in the subsystem power cord.

start from the

plugged in or power

Make sure the power switch is set

subsystem.

switch is off.

to 1 (on).

Subsystem cable is

Make sure the subsystem cables are

incorrectly installed.

installed in the proper connectors.

The Ready button is

Press and release the Ready

pressed in.

button. The button should be out
and the light should be lit (green).

The Halt button on

Press and release the host Halt

the host is pressed

button. The button should be out

in (lit - red).

and the light should not be lit.

There is no software

Load your software onto the fixed

on the subsystem.

disk drive. Follow the instructions
provided with your software.

Fixed disk read

The Ready button is

error message.

pressed in.

Press and release the Ready

button. The button should be out
and the light should be lit.

The test detected a

Copy data from the RD52 disk

bad block.

drive to diskettes and retry the

test. If the problem persists,
replace the disk drive.

4-2

Troubleshooting

Table 4-1

Basic Troubleshooting Procedure (Cont)

Problem

Possible Cause

Corrective Action

Fixed disk write

The Ready button is

Press and release the Ready

error message.

pressed in.

button. The button should be out

and the light should be lit.
The disk is write-

Press and release the Write-

protected.

Protect button. The button should
be out and the light should not be

lit.
Subsystem did not

There is

Check that the correct software is

write but there were

incompatible

installed.

no read errors.

software.

REMOVAL AND REPLACEMENT PROCEDURES

The field replaceable units (FRU) associated with the RD52-D, -R subsystem are
shown in Table 4-2.

Table 4-2

RD52 Subsystem FRUs

FRU

Part Number

Cables
Host to subsystem, 2.75 m (9 ft)

17-00484-01

Drive to drive, .3 m (1 ft)

BC17Y-1J*

RD52-A disk drive

30-21721-02
or

30-23227-02
Main printed circuit board

29-24992-00%

Power supply assembly
Fan assembly

30-22561-01
.

70-21260-01

The RD52-D, -R is designed for a maximum total cable length of 3.6 m (12
ft). Combined cable length in excess of this can produce problems.

The MPCB is an FRU only on RD52-A disk drives with a part number of
30-21721-02.

4-3

Troubleshooting

WARNING

Only qualified field service personnel should attempt to repair or
replace any parts of this subsystem.
Make sure to back up all files on a fixed disk before you
attempt any repair or replacement procedures.

Make sure you format a newly installed RD52 disk drive. See
Chapter 1, Installation, for instructions.

Only format a disk drive when you replace a complete RD52
drive assembly.

RD52 FIXED DISK DRIVE REMOVAL

To remove the RD52 fixed disk drive from the rack mount or desktop subsystems:
1.

Set the subsystem power switch to 0 (off).

Remove the ac power cord and all other cables from the subsystem.
WARNING

Failure to remove the power cord exposes you to extreme danger. AC power can be present within the chassis, even though
the green dc LED is not lit and/or the fan is not turning.

Press the quick-release tab on the rear of the rack mount unit and pull the
basic chassis from the rack (see Figure 4-1).

4-4

Troubleshooting

BASIC CHASSIS

GROOVE FOR

n‘/ FRONT VIEW

/"E'

CHANNEL GUIDE

‘\omc&( RELEASE CATCH

A. SUBSYSTEM MOUNTING ARRANGEMENT,
UNDERSIDE OF BASIC CHASSIS.

RACK MOUNT HOUSING

REAR VIEW

QUICK

RELEASE
TAB

B. MATING MOUNTING ARRANGEMENTS (2),
ON FLOOR OF RACK MOUNTING HOUSING.

Figure 4-1

Removal from Rack Mount Housing

For the desktop model (RD52-D), remove the rear bezel (three screws) and slide
the basic chassis out from the rear of the unit. Use tab located at upper middle of
rear panel to pull unit out (see Figure 4-2).

A. RD52 SUBSYSTEM,
DESKTOP MODEL

1. FRONT BEZEL
2. COVER
7

Figure 4-2

2;\

3. CHASSIS

4. REAR BEZEL

Removal from Desktop Housing
45

Troubleshooting

Press the latch with a pencil and slide the fixed disk forward (see Figure 4-3).
CAUTION
Do not drop or bump the fixed disk drive. It is a precision instru-

\\\\\‘\\\\\\\\\ QA

ment and subject to damage if handled roughly.

‘
b

Figure 4-3

4-6

//;
/D/
-

Sliding the Fixed Disk Drive Forward

Troubleshooting

Unplug the 4-wire power cord from the back of the fixed disk drive (see

Figure 4-4).

4-WIRE CONNECTOR

Figure 4-4

FIXED DISK CONNECTOR

Remove the Power Cord and Drive Cables

Pull the fixed disk drive cable straight out of the back of the fixed disk drive
as shown in Figure 4-4. Do not remove this cable at an angle to the disk

drive.

Slide the fixed disk drive out of the chassis. Use the replacement fixed disk
drive’s shipping carton to package the drive if it is to be returned.

Troubleshooting

MAIN PRINTED CIRCUIT BOARD REMOVAL (RD52 DISK DRIVE WITH PART
NUMBER 30-21721-02 ONLY)

If you remove an RD52 disk drive with this part number, replace the main printed
circuit board (MPCB) before replacing the whole drive (see Figure 4-5).

RD52-A

30-21721-02

REV-A1

II!lllllfllfllfllflIfllfllfl!fligfll]fl‘.

Figure 4-5

RD52 Disk Drive Serial Number

NOTE

The screws that you will be removing from the slide plate and
MPCB are different sizes. Make sure you install the screws in
their proper locations.

4-8

Troubleshooting

To remove the main printed circuit board:

Place the drive upside down on a flat work surface and remove the four

Phillips screws retaining the slide plate and ground clip. Set the slide plate
aside (see Figure 4-6).

Figure 4-6

Remove the Slide Mounting Plate

Troubleshooting

Unplug the 2-pin connector (near the front bezel) from the MPCB with your
fingers (see Figure 4-7).

Remove the two Phillips screws that attach the front bezel to the drive, as
shown in Figure 4-7.

MLt

=
. pr AU

Figure 4-7

Remove the 2-Pin Connector and Screws

Remove the front bezel by pulling it away from the drive. The bezel is held in
place with pop fasteners (see Figure 4-8).

Figure 4-8
4-10

Remove the Front Bezel

Troubleshooting

Remove the three Phillips screws from the heatsink, the grounding strip, and
the corner opposite the heatsink (see Figure 4-9).

Figure 4-9

Remove Phillips Screws from Heatsink

4-11

Troubleshooting

Lift the MPCB straight up until it clears the chassis. This disconnects the
12-pin fixed plug (P4) at the front end of the drive (see Figure 4-10).

Disconnect the 10-pin connector (P5) on the heatsink side of the MPCB, as
shown in Figure 4-10.

Figure 4-10

Remove the MPCB

To install a replacement MPCB, reverse steps 1 through 7.

4-12

Troubleshooting

FIXED DISK DRIVE INSTALLATION
To install a replacement fixed disk drive:
1.

Make sure the jumper clip on the fixed disk drive is set at DS3 (see

4-11).

Figure

FRONT OF DRIVE
a

|
DS2

Figure 4-11

lld]

pbs3

Ill

DS4

Set Jumper Clip

4-13

Troubleshooting

Align the the groove on the bottom of the disk drive with the channel guide on
the floor of the chassis, shown in Figure 4-12.

GROOVE FOR

]

CHANNEL GUIDE

A. UNDERSIDE RD52

CATCH FOR

QUICK RELEASE

CHANNEL GUIDE

SPRING

B. MATING MOUNTING ARRANGEMENT,
ON FLOOR OF CHASSIS

Figure 4-12

RD52-D, -R Subsystem Groove and Channel Guide

Reverse steps 1 through 7 of the removal procedure to install the disk drive.

You must format a newly installed RD52 fixed disk drive before it can be used.
Take care to insert the proper disk unit number where directed in the format
procedure (see Appendix A for the proper DUN). Refer to Chapter 1, Installation,
for formatting and testing instructions.
WARNING

Write-protect any other fixed disk drives that may be present
before you format a newly installed RD52 fixed disk drive.

Only format a disk drive when you replace a complete RD52
drive assembly.

4-14

Troubleshooting

POWER SUPPLY REMOVAL

Use the following procedure to remove the power supply.
NOTE

The power supply is a complete FRU. It is not adjustable and

does not contain replaceable printed circuit boards.
1.
2.

Remove all cables from the RD52 subsystem.
Remove the rear bezel (three screws) and slide the chassis out the rear of
the unit.
Remove the front bezel from rack mounted units, press the quick release tab,
and remove the chassis from the rack.

Remove the two screws located on the top plate of the power supply and tip
the power supply assembly gently to the right (looking from the front).

Figure 4-13

Power Supply, Component Side View

4-15

Troubleshooting

Disconnect the dc power connector located at the rear of the power supply
(see Figure 4-13).
Lift the power supply assembly out of the chassis.
Disconnect the ac power connector located at the lower front of the power
supply (see Figure 4-13).
Reverse steps 1 through 6 to install a replacement power supply.
FAN ASSEMBLY REMOVAL
1.

Remove all cables from the RD52 subsystem.

Remove the rear bezel (three screws) and slide the chassis out the rear of
the unit.

Remove the front bezel from rack-mounted units, press the quick release tab,
and remove the chassis from the rack.

Disconnect the dc plug to the fan assembly and remove the four screws on the
rear panel holding the fan assembly in place.
4.

Remove the fan assembly.

Reverse steps 1 through 4 to install a replacement fan.

4-16

Appendix A

Logical Unit Number Designation
DISK UNIT NUMBER DESIGNATION
When an RD52-D, -R subsystem is connected to a MicroPDP-11, MicroVAX, or

PDP-11/23 PLUS system, the computer software labels the unit as DUO or DU1
(disk unit). Table A-1 shows the disk unit designations made by the system

software for the MicroPDP-11, MicroVAX, and PDP-11/23 PLUS systems. Make
sure you label the subsystem. Drive unit labels come with the base computer
system.

You can only have two RD51 or RD52 fixed drives installed with your system at
any one time.

Table A-1

Disk Unit Designations

Disk Drive(s)

MicroPDP-11

MicroVAX

PDP-11/23 PLUS

Internal RX50

DUO,DU1

Internal RX50

DUO0,DU1

Add-On RX50

DU2,DU3*

Internal RX50

DU1,DU2

Internal RD51/2

DUO

Internal RX50

DU2,DU3

DUO

DU1

and

Internal RD51/2
with Add-On

RD51/2
*®

Refer to the RQDX1 Owner’s Manual for correct jumper settings. Jumper
settings should be done by trained field service personnel.

A-1

LUN Designation

Table A-1

Disk Unit Designations (Cont)

Disk Drive(s)

MicroPDP-11

MicroVAX

PDP-11/23 PLUS

DUO0,DU1

DUO

NA
NA

DUO0O,DU1
DU2,DU3

NA
NA

DU1,DU2
DUO

NA
NA

DUO
DU1

Add-On RD51/2
and RD51/2

NA
NA

DUO
DU1

~and RX50

DU2,DU3

No internal
Add-On

RX50t

No internal
Add-On

RD51/2
No internal

Add-On RX50
and RX50
No internal

Add-On RX50
and RD51/2
No internal

Add-On RD51/2
and RD51/2
No internal

Refer to the 11C23-UE/11C23-UC Installation Guide for specific requirements

for PDP-11/23 PLUS systems.

LOGICAL UNIT NUMBERS (LUN)

The logical unit numbers and the LUN jumpers provide for future expansion capability of more than one RQDX1 module per system. Jumpers on the RQDX1 controller module select the LUN. These jumpers determine the lowest LUN assigned
to any RD51, RD52, and RX50 disk drives present in the system.

The RQDX1 module automatically sizes the logical unit configuration during initialization of the system to determine how many of the four possible units are actually
present. The system software automatically assigns disk unit numbers to any drives
that are present. An RX50 diskette drive is two units. Table A-2 shows the standard LUN jumper configuration.

A-2

LUN Designation

Table A-2

RQDX1 Standard Logical Unit Number Configuration

Jumper

State

LUN 1

Out (Logical unit number [0])*

LUN 2

Out

LUN 3

Out

LUN 4

Out

LUN 5

Out

LUN 6

Out

LUN 7

Out

LUN 8

Out

Indicates that logical unit numbers 0 — 3 are assigned to this controller module. The controller automatically determines if less than four logical units are
present. When this configuration, or any other configuration, of LUN jumper
setting 1s used, the system software always assigns disk unit numbers (DUN)

of DUO to DU3.

The LUN jumper format allows only one jumper to be installed at a time. To
configure the module for LUNs beginning with other than unit number 0, use the

format shown in Table A-3. The system software presently assigns any selection as
DUO to DUS.
Table A-3

RQDX1 Logical Unit Number Jumper Configuration Choices

LUN

LUNs

DUN

Jumper Installed

Specified

Assignment

No jumper 1nstalled

0-3

DUO0-DU3

4-7

DU0-DU3

8-11

DU0-DU3

12-15

DU0-DU3

16-19

DU0-DU3

20-23

DU0-DU3

24-27

DU0-DU3

28-31

DUO0-DU3

32-35

DU0-DU3

The controller automatically determines if fewer than four logical units are
present.

A-3

LUN Designation

As an example, Table A-4 shows the LUN and DU designations when LUN jumper
4 1s installed.

Table A-4

RQDX1 Logical Unit Number Jumper 4 Format

Jumper

Unit Number

Installed

Specified

16 = first unit

17 = second unit

18 = third unit
19 = fourth unit

A-4

Appendix B

System Specifications
ENVIRONMENT

To receive the best possible performance from the RD52-D, -R subsystem, you
must provide the right operating environment, as shown in Table B-1.

Table B-1

General Environmental Requirements

Environment

Operating

Maximum altitude

Temperature range*

Nonoperating

2.4 km

9.1 km

(8,000 feet)

(30,000 feet)

10°C—40°C

-40°C—66°C

(50°F—104°F)

(-40°F-150.8°F)

Temperature change rate

1°C/hour (1.8°F/hour)

Relative humidity

20% to 80%

10% to 95%

(non-condensing)

Heat dissipation

119 BTU/hr (typ.)
148 BTU/hr (max.)

Reduce the temperature specification by 1.8°C (35.2° F) for each 1000 m
(3,300 ft) increase in altitude.

SUBSYSTEM DIMENSIONS
Height

13.97 cm (5.50 in)

Width

22.86 cm (9 in)

Length

30.58 cm (12 in)

Weight

6.36 kg

(14 1b)

B-1

System Specifications

RD52 FIXED DISK DRIVE

Performance Specifications
Average access time

53 m/s

Average rotational latency

8.5 m/s

Transfer rate

5 Mbits/s

Media Characteristics
30.96 Mbytes

Formatted capacity

Recording surfaces (heads)

Disks

Bytes per track

10,416

Tracks per drive
Track density (tpi)

3,072

Recording method

Modified Frequency

591

Modulation (MFM)
Physical Specifications

Height
Width
Depth
Weight

8.25 cm (3.25 in)
14.6 cm (5.75 in)
20.32 cm (8.00 in)
3.15 kg (7 lbs)

POWER SUPPLY
Inputs
Line voltage

(switch selectable)

100-120 Vac nominal, single phase, 3 wire
200-240 Vac nominal, single phase, 3 wire

Line frequency

47 Hz-63 Hz either input range

Line current

120 V, 2 amp RMS (max.)
240 V, 1 amp RMS (max.)

Outputs
Power
dc voltages

B-2

65 W maximum

+12 A Vdc #5%, 0.1 A (min.) to 4.5 A (max.)
+12 B Vdc +10%, 0.12 A (max.) (dc fan only)
+5 Vdc +5%, 0.3 A (min.) to 2.0 A (max.)

Appendix C

Connector Pin Numbers and Signals
J1, J2, AND J3 CONNECTORS
Connectors J1, J2, and J3 have identical signal names and pin numbering.
Table C-1

Connector Signals

Pin No.

Signal Name

J1-01

MEMWRTDT1 (H) (RD51/RD52 only signal)

J1-34

MEMWRTDT1 (L) (RD51/RD52 only signal)

J1-18

GROUND

J1-02

HEAD SET 2 (L) (RDXX only signal)*

J1-35

GROUND

J1-19

SEEKOPLT

J1-03

RD1 RDY (H) (RD51/RD52 only signal)

J1-36

WPT FAULT (L)

J1-20

GROUND

J1-04

READ SEL 1 (L)

J1-37

RXOWPTLED (L) (RX50 only signal)

J1-21

RDO RDY (H) (RD51/RD52 only signal)

J1-05

RX1IWPTLED (L) (RX50 only signal)

J1-38

DRVSLOACK (L) (RD51/RD52 only signal)

J1-22

MEMRDDATO (H) (RD51/RD52 only signal)

J1-06

MFMRDDATO (L) (RD51/RD52 only signal)

J1-39

MFMWRTDTO (H) (RD51/RD52 only signal)

J1-23

MFMWRTDTO (L) (RD51/RD52 only signal)

J1-07

MFMRDDAT1 (H) (RD51/RD52 only signal)

J1-40

MFMRDDAT1 (L) (RD51/RD52 only signal)

J1-24

GROUND

J1-08

RFDUCWRTI (L)

J1-41

RDOWRTPRO (L) (RD51/RD52 only signal)

J1-25

DRV SEL 4 (L)

Reserved for future use.

C-1

Connector Pin Numbers and Signals

Table C-1

Connector Signals (Cont)

Pin No.

Signal Name

J1-09
J1-42

GROUND
INDEX (L)

J1-26

RD1WRTPRO (L) (RD51/RD52 only signal)

J1-10
J1-43
J1-27

DRV SEL 3 (L)

DRV SEL 1 (L)
DRV SEL 2 (L)

J1-11
J1-44

RX2WPTLED (L) (RX50 only signal)
RXMOTORON (L) (RX50 only signal)

J1-28
J1-12
J1-45

GROUND
DIRECTION (L)
GROUND

J1-29

STEP ()

J1-13

GROUND

J1-30
J1-14
J1-47
J1-31

GROUND
WRT GATE (L)
GROUND
TRACK 00 (L)

J1-32

GROUND

J1-46

J1-15
J1-48

RXWRTDATA (L) (RX50 only signal)

RX3WPTLED (L) (RX50 only signal)
DRVSL1ACK (L) (RD51/RD52 only signal)

J1-16

READ DATA (L)

J1-49

GROUND

J1-33
J1-17
J1-50

C-2

HEAD SEL 0 (L)
GROUND
READY (L)

Connector Pin Numbers and Signals

POWER SUPPLY CONNECTORS
Table C-2

AC Power Input Connectors

Pin No.

Signal

1
2

Ground
AC phase

3
Table C-3

AC neutral

DC Power Output Connectors

Pin No.

Signal

O 00O
Ul
Wi

+5V

+12B YV
No pin
No connection

11
12

+5V
+5V
Return
Return
Return
Return

+12 AV

C-3

Appendix D