Digital PDFs

EK-TF837-SM-001

February 1991

153 pages

Original

3.9MB

Document:	TF837 Magazine Tape Subsystem Service Manual
Order Number:	EK-TF837-SM
Revision:	001
Pages:	153
Original Filename:

OCR Text

TF837 Magazine Tape Subsystem
Service Manual
Order Number EK–TF837–SM–001

Digital Equipment Corporation

First Edition, February 1991
The information in this document is subject to change without notice and 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.
Restricted Rights: Use, duplication, or disclosure by the U. S. Government is subject to
restrictions as set forth in subparagraph ( c ) ( 1 ) ( ii ) of the Rights in Technical Data and
Computer Software clause at DFARS 252.227–7013.
Copyright © Digital Equipment Corporation 1991
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual 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: BASIC, CompacTape,
CompacTape II, DECdirect, DECmailer, DECservice, DSSI, SERVICenter, TF, TK, TMSCP,
VAX, VMS, and the DIGITAL logo.
This document was prepared and published by Educational Services Development and
Publishing, Digital Equipment Corporation.

Contents
About This Manual
1

Overview

1.1
1.2
1.3
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.5
1.6
1.6.1
1.7
1.8
1.9
1.10
1.11

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSSI Node ID Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loader Transfer Assembly . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TK71 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSSI Bus Controller Module . . . . . . . . . . . . . . . . . . . . . . .
Service Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual-Host Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessing the TF837 Subsystem through a Specific Host . .
TMSCP Communications Protocol . . . . . . . . . . . . . . . . . . . . .
Software Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–4
1–4
1–6
1–6
1–8
1–8
1–9
1–9
1–10
1–11
1–11
1–12
1–12
1–12
1–13
1–13
1–14

iii

iv Contents

Operation

2.1
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.1.1
Disabling the Operator Control Panel . . . . . . . . . . . . . . . . 2–1
2.2
Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2.2.1
Removing the Magazine from the Receiver . . . . . . . . . . . . 2–4
2.2.2
Loading Cartridges into the Magazine . . . . . . . . . . . . . . . . 2–7
2.2.3
Unloading Cartridges from the Magazine . . . . . . . . . . . . . 2–9
2.2.4
Restoring the Magazine to the Receiver . . . . . . . . . . . . . . . 2–9
2.3
Mode Select Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
2.3.1
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
2.3.2
Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11

Power-On Self-Test

3.1
3.2
3.2.1
3.3
3.4
3.4.1
3.5

TF837 Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loader Transfer Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Mechanical Status . . . . . . . . . . . . . . . . . . . . . . .
TK71 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TFK70 DSSI Controller Module . . . . . . . . . . . . . . . . . . . . . . .
Recording POST Errors in EEPROM . . . . . . . . . . . . . . . . .
Power-On Self-Test Failures . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–2
3–4
3–4
3–5
3–7

Local Programs and Utilities

4.1
Accessing Local Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.1.1
Error Message after Executing SET HOST/DUP . . . . . . . . 4–2
4.2
PARAMS Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3
4.2.1
Displaying, Setting, and Saving Parameters . . . . . . . . . . . 4–3
4.2.1.1
SHOW /ALL Command . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
4.2.1.2
SET Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
4.2.1.3
WRITE Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.2.1.4
EXIT Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.3
DIRECT Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.4
DRVTST Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7
4.5
DRVEXR Progam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8
4.6
LOADER Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.7
HISTRY Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10

Contents v

4.8
4.9

MAGTST Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12
MAGINI Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–13

Problem Resolutions, Error Conditions, and Jam
Recovery

5.1
Nondetectable FRU Failures . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.2
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.2.1
Detecting Common Failure Influences . . . . . . . . . . . . . . . . 5–3
5.2.2
Detecting Soft Error Rates . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.3
Magazine and Loader Faults . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
5.3.1
Magazine Fault Description . . . . . . . . . . . . . . . . . . . . . . . . 5–5
5.3.2
Loader Fault Description . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6
5.3.2.1
Clearing a Loader Fault . . . . . . . . . . . . . . . . . . . . . . . . . 5–6
5.4
Jam Recovery Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7
5.4.1
Loader Action During a Jam . . . . . . . . . . . . . . . . . . . . . . . 5–7
5.4.2
Terminology and Definitions . . . . . . . . . . . . . . . . . . . . . . . 5–9
5.4.3
Steps to Follow During the Jam Recovery Process . . . . . . . 5–11

Removal and Replacement

6.1
Recommended Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2
Removal and Replacement Guidelines . . . . . . . . . . . . . . . . . .
6.3
FRU Removal and Replacement Procedures . . . . . . . . . . . . .
6.3.1
Removing and Replacing the TFK70 DSSI Controller
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.1.1
Beginning the Warm Swap Procedure . . . . . . . . . . . . . .
6.3.1.2
Collecting and Recording Original Controller Module
Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.1.3
Removing the TFK70 DSSI Controller Module . . . . . . .
6.3.1.4
Replacing the TFK70 DSSI Controller Module . . . . . . . .
6.3.1.5
Restoring Parameters . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.1.6
Completing the Warm Swap Procedure . . . . . . . . . . . . .
6.3.2
Removing and Replacing the Loader Transfer Assembly . .
6.3.3
Removing and Replacing the TK71 Tape Drive . . . . . . . . .
6.3.4
Removing and Replacing the TK71 Tape Drive Takeup
Leader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.5
Removing and Replacing the Operator Control Panel . . . .

6–3
6–4
6–4
6–5
6–5
6–6
6–9
6–13
6–14
6–15
6–16
6–26
6–34
6–37

vi Contents

6.3.6
Removing and Replacing the 12 Vdc Fan . . . . . . . . . . . . . .
6.3.7
Removing and Replacing the Interlock Switch . . . . . . . . . .
6.3.8
Removing and Replacing the Power Supply Assembly . . . .
6.3.9
Removing and Replacing the Handle Motor Assembly . . . .
6.4
Manually Removing a Cartridge from the Drive . . . . . . . . . .

6–39
6–40
6–43
6–47
6–51

Head Cleaning

A.1 Tape Drive Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.1
Cleaning the Read/Write Heads . . . . . . . . . . . . . . . . . . . . .
A.1.2
Securing the TF837 Subsystem . . . . . . . . . . . . . . . . . . . . .

Error Logs

B.1
B.2
B.3

Device-Dependent Error Codes . . . . . . . . . . . . . . . . . . . . . . .
Device-Dependent Status Codes . . . . . . . . . . . . . . . . . . . . . . .
Error Reporting Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wiring

A–2
A–7
A–9

B–2
B–3
B–4

Index
Figures
1–1
1–2
1–3
1–4
1–5
1–6
2–1
2–2
2–3
2–4
2–5
2–6
3–1

TF837 Magazine Tape Subsystem Block Diagram . . . . . . . . . 1–2
SF200 Storage Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Front View of TF837 Magazine Tape Subsystem . . . . . . . . . 1–5
TF837 Magazine Tape Subsystem Components . . . . . . . . . . . 1–7
Front View of TF837 Magazine . . . . . . . . . . . . . . . . . . . . . . . 1–8
CompacTape II Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–9
TF837 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Front View of TF837 Magazine . . . . . . . . . . . . . . . . . . . . . . . 2–5
Receiver Opened . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
Write-Protect Tab on a CompacTape II Tape Cartridge . . . . . 2–7
Loading a Cartridge into the Front of the Magazine . . . . . . . 2–8
Mechanical Stops Associated with Service Mode . . . . . . . . . . 2–12
Home Position of the Elevator . . . . . . . . . . . . . . . . . . . . . . . . 3–3

Contents vii

3–2
5–1
5–2
5–3
5–4
5–5
6–1
6–2
6–3
6–4
6–5
6–6
6–7
6–8
6–9
6–10
6–11
6–12
6–13
6–14
6–15
6–16
6–17
6–18
6–19
6–20
6–21
6–22
A–1
A–2
A–3
A–4
A–5
C–1

TFK70 DSSI Controller Module Diagnostic Indicators . . . . . .
TF837 Magazine Tape Subsystem . . . . . . . . . . . . . . . . . . . . .
First Mechanical Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Open Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Right and Left Shaft Locations . . . . . . . . . . . . . . . . . . . . . . .
Removing Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TF837 Magazine Tape Subsystem FRUs . . . . . . . . . . . . . . . .
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TFK70 DSSI Bus Controller Module Tray . . . . . . . . . . . . . . .
TFK70 DSSI Bus Controller Module Block Diagram . . . . . . .
Sliding the TF837 Subsystem to the First Mechanical Stop . .
Mechanical Ejection Lever . . . . . . . . . . . . . . . . . . . . . . . . . .
Loader Transfer Assembly Latch Position . . . . . . . . . . . . . . .
Left Side View of Magazine Tape Subsystem . . . . . . . . . . . . .
Front of Magazine Showing Cartridge Slots . . . . . . . . . . . . . .
Open Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sliding the TF837 Subsystem to the Second Mechanical Stop
TF837 Magazine Tape Subsystem Plastic Tab . . . . . . . . . . . .
Cabling at Rear of Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handle Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Takeup Leader (Leader Removed from the
Tape Path) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TK71 Tape Path (Takeup Leader Replaced) . . . . . . . . . . . . . .
Removing the OCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interlock Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Intermediate Bezel . . . . . . . . . . . . . . . . . . . . .
Power Supply Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handle Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manually Rewinding Tape in a TK71 Tape Drive . . . . . . . . .
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sliding the TF837 Magazine Tape Subsystem Toward You . .
Using the Loader Open Latch . . . . . . . . . . . . . . . . . . . . . . . .
TK71 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inserting the Positioning Cartridge into the TK71 Tape Drive
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–6
5–1
5–10
5–12
5–15
5–18
6–2
6–10
6–11
6–12
6–17
6–18
6–20
6–21
6–24
6–25
6–28
6–29
6–30
6–31
6–35
6–36
6–38
6–41
6–44
6–45
6–49
6–52
A–3
A–4
A–5
A–6
A–8
C–2

viii Contents

Tables
1–1
1–2
1–3
1–4
1–5
1–6
2–1
3–1
4–1
5–1
5–2
6–1
6–2

Noninitialized Cartridge Compatibility . . . . . . . . . . . . . . . . .
Initialized Cartridge Compatibility . . . . . . . . . . . . . . . . . . . .
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TF837 Magazine Tape Subsystem Diagnostics . . . . . . . . . . . .
TF837 Magazine Tape Subsystem Specifications . . . . . . . . . .
TK71 Tape Drive Specifications . . . . . . . . . . . . . . . . . . . . . . .
TF837 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
TFK70 DSSI Controller Module POST Error Codes . . . . . . . .
Summary of TF837 Subsystem Parameters . . . . . . . . . . . . . .
Fault Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Common Failures, Causes, and Corrections . . . . . . . . . . . . . .
Field Replaceable Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Spares List . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–10
1–10
1–13
1–13
1–14
1–15
2–3
3–4
4–4
5–2
5–4
6–1
6–3

About This Manual
Manual Structure
Chapter 1, Overview, provides a basic product description of and
specifications for the TF837 magazine tape subsystem. It also contains
dual-host information relating to the TF837 subsystem.
Chapter 2, Operation, describes the keys and indicators on the operator
control panel (OCP), the operating modes of the Mode Select key, and the
magazine and cartridge removal and replacement processes.
Chapter 3, Power-On Self-Test, describes the loader transfer assembly,
TK71 tape drive, and DSSI bus controller module activities during POST.
POST errors in EEPROM and POST failures are included.
Chapter 4, Local Programs and Utilities, describes local diagnostic
programs and utilities, and the SET HOST/DUP command.
Chapter 5, Problem Resolutions, Error Conditions, and Jam Recovery,
describes failures in the TF837 subsystem and how to recover from them.
Chapter 6, Removal and Replacement, describes how to remove and
replace subsystem FRUs and how to perform the warm swap procedure.
Appendix A, Head Cleaning, describes how to access the tape drive to
clean the read/write heads.
Appendix B, Error Logs, lists the device-dependent error and status codes,
and the error reporting format.
Appendix C, Wiring, provides a diagram of the wiring connections in the
TF837 magazine tape subsystem.

Intended Audience
This manual is for use by Customer Services field engineers.

x About This Manual

Conventions
The term TF837 subsystem refers to the TF837 magazine tape subsystem.
This manual uses both terms.

1
Overview
This chapter provides a general description of the TF837 magazine tape
subsystem.

1.1 Product Description
The TF837 magazine tape subsystem (Figure 1–1) is a data storage device
that can store approximately 2 Gbytes of data using 7 CompacTape II
cartridges. It can store up to 296 Mbytes of data per CompacTape II
cartridge.
In addition, the TF837 subsystem combines automatic cartridge loading
capabilities with a TK71 tape drive. The TF837 subsystem can load and
unload tape cartridges into and from the tape drive, providing a degree of
unattended backup, as well as perform single cartridge operations. The
TF837 subsystem performs automatic, sequential tape operations.
The TF837 subsystem can be configured on VAX systems with a DSSI
(Digital Storage System Interconnect) device, supported under the VMS
operating system.
The TF837 magazine tape subsystem installs in an SF200 storage array
that can contain a maximum of two TF837 subsystems. The first TF837
subsystem installs in position 5; a second TF837 subsystem installs in
position 6 (Figure 1–2).
NOTE
The SF200 storage array can also contain other Digital storage
devices such as the RF72 series disk drives. For more information
about the SF200 storage array, refer to the SF200 Storage Array
Installation Guide.

1–1

1–2 Overview

DOCUMENTATION

MAGAZINE

COUNTRY
KITS

HOST
S/W
(VMS)

RACK
MOUNT
KIT

DSSI
CONTROLLER
MODULE

TK71

REAR
CHASSIS

LOADER
TRANSFER
ASSEMBLY

SHR_X1009A_89

Figure 1–1

TF837 Magazine Tape Subsystem Block Diagram

Overview 1–3

POSITION 5
0

POSITION 6

6
3

CXO-2461B
SHR_X1106A_89

Figure 1–2

SF200 Storage Array

1–4 Overview

1.2 Operating Modes
The TF837 subsystem operates in the following modes:
•

OCP Disabled mode — Locks the subsystem into the enclosure and
locks the receiver. The buttons on the operator control panel (OCP)
are disabled. This mode automatically loads the next tape cartridge
into the drive after you issue the DISMOUNT command.

•

Automatic mode — Is the subsystem’s default, or normal, mode.
It locks the subsystem into the enclosure but leaves the receiver
unlocked. This mode automatically loads the next tape cartridge into
the drive after you issue the DISMOUNT command. The OCP buttons
remain enabled.

•

Manual mode — Locks the subsystem into the enclosure but
leaves the receiver unlocked. This mode allows for single cartridge
operations only. The OCP buttons remain enabled. Operator
intervention is required to select the next, or any other, cartridge.

•

Service mode — Unlocks the subsystem from the enclosure and
removes it from its normal operating position. Use this mode to
perform the head cleaning, jam recovery, and servicing procedures.

You can select these modes through the Mode Select key (Figure 1–3).
Refer to Section 2.3 for more information.

1.3 DSSI Node ID Label
The operator control panel has a space for a DSSI node ID label that
identifies the device bus ID number (Figure 1–3). The DSSI node ID is
preset during manufacturing to its normal setting of zero (0), and should
be verified during installation at the customer site.

Overview 1–5

OPERAT OR CONTROL PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025B_89

Figure 1–3

Front View of TF837 Magazine Tape Subsystem

1–6 Overview

1.4 Hardware Components
The TF837 magazine tape subsystem consists of the following major
hardware components (Figure 1–4):
•

Loader
— Operator control panel (OCP)
— Magazine
— Loader transfer assembly consisting of elevator, mechanics, and
electronics

•

Rear Chassis
— TK71 tape drive
— Power supply assembly
— Handle motor assembly
— Fan
— Interlock switch
— DSSI bus controller module

1.4.1 Operator Control Panel
The TF837 operator control panel (OCP) (Figure 1–3) contains buttons
and indicators that are used with the Mode Select key (Section 2.3).

Overview 1–7

LOADER TRANSFER ASSEMBLY
INTERLOCK
SWITCH

DSSI
CONTROLLER
MODULE

OPERATOR
CONTROL
PANEL
(OCP)

TK71
TAPE
DRIVE

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

SHR-X0147A-90-CPG

Figure 1–4

TF837 Magazine Tape Subsystem Components

1–8 Overview

1.4.2 Magazine
The TF837 subsystem’s magazine (Figure 1–5) serves as a removable
cartridge container. The magazine stores up to seven CompacTape II
cartridges.

1.4.3 Loader Transfer Assembly
The loader transfer assembly (Figure 1–4) contains an elevator that moves
to each of the storage slots in the magazine, as well as to the cartridge
opening in the tape drive. This mechanism inserts and extracts the tape
cartridges into and from the magazine and tape drive. (The signals that
drive the elevator mechanics originate at the loader transfer assembly
electronics module.)

SHR_X1023A_89

Figure 1–5

Front View of TF837 Magazine

Overview 1–9

1.4.4 Rear Chassis
The rear chassis contains the DSSI bus controller module, power supply
assembly, interlock switch, TK71 tape drive, and the handle motor
assembly that lifts and lowers the drive’s handle when cartridges are
ready for insertion into, or removal from, the drive.

1.4.5 TK71 Tape Drive
The TF837 subsystem uses the CompacTape II cartridge (Figure 1–6).
It is a 4-inch plastic cartridge containing 600 feet of 1/2-inch magnetic
tape. The TK71 tape drive writes 48 tracks on the tape, up to 296 Mbytes
per CompacTape II cartridge. The tape drive reads and writes data in
a serpentine fashion, traveling the entire length of tape on one track (at
approximately 100 inches per second), then reversing direction on the
next track.
The maximum time to back up (read or write) on a CompacTape II
cartridge in a continual, or streaming, mode is approximately one hour.
Therefore, executing a backup to seven cartridges takes approximately
seven hours.

a
cT

SHR_X1020B_89

Figure 1–6

CompacTape II Cartridge

1–10 Overview

Tables 1–1 and 1–2 show the compatibility of CompacTape and
CompacTape II cartridges with the TK71 tape drive.
Table 1–1 Noninitialized Cartridge Compatibility
TK71 drive

CompacTape

CompacTape II

Not supported
(See Caution
below)

Yes

Table 1–2 Initialized Cartridge Compatibility

TK71 drive

TK50
Initialized
Cartridge

TK70
Initialized
Cartridge

TK71
Initialized
Cartridge

Read-only

Read/write

CAUTION
If you load a CompacTape cartridge into the drive, the subsystem
will initialize the drive; however, a higher incidence of errors or
data corruption is likely to occur.

1.4.6 DSSI Bus Controller Module
The TF837 magazine tape subsystem connects to the host system through
a DSSI bus. The physical interface is a TFK70 DSSI controller module
that resides in the rear chassis of the TF837 subsystem (Figure 1–4).
A serial communications path passes commands, messages, data, and
error information between the TFK70 DSSI controller module and the
loader transfer assembly. A second serial path does the same between the
TFK70 DSSI controller module and the TK71 tape drive.

Overview 1–11

1.5 Service Features
The TF837 magazine tape subsystem has these service features:
•

Power-on self-testing (POST) for the electronics and mechanics
associated with the loader transfer assembly, the TK71 tape drive,
and the DSSI bus controller module

•

Automatic calibrating of the TK71 tape drive

•

Automatic home positioning of the elevator (home position is down)

•

Interlocking circuitry that disables 24 Vdc to the loader transfer
assembly when the TF837 subsystem is pulled out of the enclosure for
either head cleaning or servicing

•

Mechanical design that allows easy access to most field replaceable
units (FRUs)

1.6 Dual-Host Configuration
Although the TF837 subsystem is not a dual-host device, it can be used in
a dual-host configuration as a dual-ported tape subsystem.
While a dual-ported TF837 subsystem can establish two virtual circuits
(one to each host), only one tape connection (to one of the two hosts) is
actually made. This connection is made by the host that configures the
TF837 subsystem first. Once connected, the TF837 subsystem can be
accessed through that host only.

1–12 Overview

1.6.1 Accessing the TF837 Subsystem through a Specific
Host
To access the TF837 subsystem through a specific host, you must power on
that host first. This tape connection is permanent until the host system
or the TF837 subsystem is powered down. If the current host is powered
down, the TF837 subsystem automatically connects to the other host.
Certain conditions cause the TF837 subsystem to disconnect from the
original host and randomly reconnect to one of the two hosts. It is not
evident which host establishes the tape connection. To determine the tape
status, check both hosts. Some conditions that can cause this are:
1. Reinitialization through the DUP command
2. Power-on of the TF837 subsystem
3. Virtual circuit closed by port for certain errors; for example,
transmission failure

1.7 TMSCP Communications Protocol
The TF837 magazine tape subsystem conforms to Digital’s protocol for
tape mass storage communications. As with other TMSCP subsystems,
the controller module is the logical area that contains the intelligence to
perform detailed I/O handling tasks. This arrangement allows the CPU
to send command messages (requests for reads or writes) to the controller
and receive messages from the controller.

1.8 Software Support
The TF837 magazine tape subsystem is supported by VMS version 5.4 or
later.

Overview 1–13

1.9 Related Documentation
Table 1–3 lists references that supplement this manual.
Table 1–3 Related Documentation
Title

Audience

Order Number

TF837 Magazine Tape
Subsystem Owner’s Manual

System managers and
operators

EK–TF837–OM

SF200 Storage Array
Installation Guide

Digital Customer
Services personnel

EK–SF200–IG

KFMSA Module Installation
and User Manual

Digital Customer
Services personnel

EK–KFMSA–IM

VAX/VMS Backup Utility
Reference Manual

System managers and
operators

AA–Z407B–TE

Guide to VAX/VMS Disk and
Magnetic Tape Operations

System managers and
operators

AI–Y506B–TE

VAX/VMS Error Log Utility
Reference Manual

System managers and
operators

AA–Z402B–TE

1.10 Diagnostics Listing
Table 1–4 lists the TF837 magazine tape subsystem diagnostics.
Table 1–4 TF837 Magazine Tape Subsystem Diagnostics
Diagnostic

Component Tested

Reference Chapter

POST

TFK70 DSSI controller
module

POST

Loader transfer assembly

POST

TK71 tape drive

Local
diagnostic
programs

TF837 magazine tape
subsystem

1–14 Overview

1.11 Specifications
Table 1–5 lists the specifications for the TF837 magazine tape subsystem,
and Table 1–6 lists those for the TK71 tape drive.
Table 1–5 TF837 Magazine Tape Subsystem Specifications
Characteristic

Specification(s)

Height

264.7 mm (10.42 in)

Width

222.0 mm (8.74 in)

Length

685.4 mm (26.98 in)

Weight

22.1 kg (55 lb)

Noise level

62 dB

Electrical power requirements

120 V at 60 Hz or 220/240 at 50 Hz

Environmental temperature,
operating

10°C to 40°C (50°F to 104°F)

Environmental temperature,
nonoperating

–40°C to 66°C (–40°F to 150.8°F)

Humidity, operating

20% to 80% noncondensing

Humidity, nonoperating

10% to 95%

EMI certification

Meets applicable FCC, VDE, and FTZ
standards for Class A devices

Safety certification

Meets UL, CSA, GS mark, VDE, and IEC
standards

Maximum number of cartridges for
TF837 magazine tape subsystem

Power consumption

60 W

Communications interface

DSSI bus

Cycle time

50 s (maximum)

Overview 1–15

Table 1–6 TK71 Tape Drive Specifications
Characteristic

Specification(s)

Mode of operation

Streaming

Media

12.77 mm (1/2 in) unformatted magnetic tape

Track density

96 tracks/in (45 tracks)

Bit density

10,000 bits/in

Number of tracks

Transfer rate
(at tape)

125 Kbytes/s

Tape speed

100 in/s

Track format

Multiple track serpentine recording

Cartridge capacity

Up to 296 Mbytes, formatted (approximately)

Power requirements

12 V 5% @ 1.6 A (2.4 A surge),
75 mV ripple peak-to-peak
+5 V 5% @ 1.1 A (1.5 A surge),
75 mV ripple peak-to-peak

Power consumption
Drive

40 W (maximum)

Host adapter

15 W (maximum)

2
Operation
This chapter describes the functions of the operator control panel,
magazine, Mode Select key, and DSSI node ID label on the TF837
magazine tape subsystem.

2.1 Operator Control Panel
The TF837 operator control panel (OCP) (Figure 2–1) contains buttons
and indicators that are used with the Mode Select key (Section 2.3).
Table 2–1 lists the OCP buttons and indicators, and briefly describes their
functions.
NOTE
The Eject, Load/Unload, and Slot Select buttons have indicators
within them, and are operable only when their corresponding
indicators are on.
The Load/Unload button has three functions: load, unload, and
reset. In the event of a malfunction, if the Loader Fault or
Magazine Fault indicator is on, press the Load/Unload button
to reset the TF837 subsystem.

2.1.1 Disabling the Operator Control Panel
To disable the operator control panel (OCP), set the Mode Select key to
OCP Disabled mode (Figure 2–1). This mode prevents unwanted manual
intervention when the TF837 subsystem is running unattended.

2–1

2–2 Operation

OPERAT OR CONTROL PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025B_89

Figure 2–1

TF837 Operator Control Panel

Operation 2–3

Table 2–1 TF837 Operator Control Panel
Button/Indicator

Color

Function

Eject button

Opens the receiver, allowing access to the
magazine for removal and insertion of cartridges.
Also can be used to unload the tape from the
drive.

Eject indicator

Green

When on, indicates that pressing the Eject button
opens the receiver. When off, inhibits switch
function; no effect.

Load/Unload
button

Loads the currently selected cartridge into
the TK71 tape drive, or unloads the cartridge
currently in the tape drive.
If the Loader Fault or Magazine Fault indicators
are on, can also be used to reset the subsystem.

Load/Unload
indicator

Green

When on, indicates that you can press the
Load/Unload button. When off, inhibits switch
function; no effect.

Slot Select
button

When pressed, increments the current slot
indicator to the next slot.

Slot Select
indicator

Green

When on, indicates that pressing the Slot Select
button will increment the current slot indicator to
the next slot. When off, indicates that the switch
function is disabled.

Power On
indicator

Green

When on, indicates the TF837 magazine tape
subsystem is in a known good power state (ac
and dc voltages are within tolerance). When
off, indicates that the power is missing from the
loader.

Write Protected
indicator

Orange

When on, indicates that the cartridge currently in
the drive is write-protected.1 When off, indicates
that the current cartridge is write-enabled.

Tape In Use
indicator

Yellow

Indicates tape drive activity as follows:

1 Cartridges can be write-protected in three ways:

• Setting the write-protect tab to write protect
• Using software write-protect qualifiers (See your operating system documentation.)
• Using a CompacTape cartridge originally written to by a TK50 tape drive (read-only)

2–4 Operation

Table 2–1 (Cont.) TF837 Operator Control Panel
Button/Indicator

Color

Function
Slow flashing indicates tape is rewinding; rapid
flashing indicates tape is reading or writing.
When on, indicates that the tape is stopped.
When off, indicates that no tape is in the drive.

Magazine Fault
indicator

Red

When on, indicates a magazine failure. When off,
indicates that there is no magazine failure.

Use Cleaning
Tape indicator

Orange

Not implemented in TF837 subsystem.

Loader Fault
indicator

Red

When on, indicates a TF837 loader transfer
assembly error or drive error. When off, indicates
no loader fault.

Current slot
indicators 0–6

Green

When on, identifies the current slot (see Slot
Select button). Each current slot indicator flashes
when its corresponding cartridge is moved to or
from the drive. Also used with the Magazine
Fault or Loader Fault indicator to show the type
of fault.
During BACKUP command execution in either
Automatic or OCP Disabled mode, the current
slot indicators flash as the storage capacity of
each tape cartridge is used.

2.2 Magazine
This section describes how to remove the TF837 magazine (Figure 2–2)
from the receiver, load and unload cartridges into and from the magazine,
and restore a magazine to the receiver.

2.2.1 Removing the Magazine from the Receiver
To remove the magazine from the TF837 subsystem, first:
1. Be sure that the Power On indicator is on (Figure 2–1).
2. Be sure that the Eject indicator is on before you press the Eject
button.

Operation 2–5

Then:
1. Press the Eject button (Figure 2–1) (indicator must be on). The
receiver opens slightly.
2. Grasp the receiver and gently pull it forward to access the magazine
(after the receiver opens).
3. Grasp the magazine’s handle and lift the magazine out of the receiver
(Figure 2–3).

SHR_X1023A_89

Figure 2–2

Front View of TF837 Magazine

2–6 Operation

Ejec

Loa

Slot

Pow

Wri

nloa

Sele

er O

te P

Tap

rote

e In

Driv

Loa

d/U

e Fa

d Fa

Use

ult

SHR-X0045-90

Figure 2–3

Receiver Opened

Operation 2–7

2.2.2 Loading Cartridges into the Magazine
To load a cartridge:
1. Grasp the cartridge with the CompacTape II label up and the writeprotect tab toward you (Figure 2–4).
2. Set the cartridge’s write-protect tab to the desired position. (For
backup operations, set the write-protect tab to the write position.
You can set the write-protect tab to write protect when you want the
host system to only read data off the tape. Setting the tab to the
write-protect position helps ensure data integrity.)
3. Load the cartridge into the desired magazine position at the front of
the magazine (Figure 2–5) until you hear a ‘‘click’’ (each magazine
position is spring-loaded).
NOTE
All cartridges must be loaded at the front of the magazine. The
front of the magazine shows the numbers 0 through 6, signifying
the number of the slot.

ORANGE
INDICATOR

m
Co

e
ap

NOT WRITEPROTECTED

WRITEPROTECTED
SHR_X1020A_89

Figure 2–4

Write-Protect Tab on a CompacTape II Tape Cartridge

2–8 Operation

BACK OF
MAGAZINE

NOTE: Push tape in
until a click is heard

1
TM

4
4

5
5

SLOT
NUMBERS
0-6

FRONT OF
MAGAZINE

SHR_X1021_89

Figure 2–5

Loading a Cartridge into the Front of the Magazine

Operation 2–9

2.2.3 Unloading Cartridges from the Magazine
To unload a cartridge from the magazine, press the cartridge at the front
of the magazine. After pressing the cartridge in all the way, it ‘‘springs
forward,’’ toward you.
NOTE
Always be sure to load and unload cartridges at the front of the
magazine.
Never apply labels to the top or bottom of tape cartridges. Doing
so can cause cartridge jams in the TF837 subsystem.

2.2.4 Restoring the Magazine to the Receiver
To restore the magazine to the receiver:
1. Slide the magazine into the receiver (Figure 2–3). Since the magazine
is slotted, you can restore it only in the correct orientation.
2. Push the receiver closed.
3. Be sure that the receiver is fully closed in the TF837 subsystem before
proceeding.

2.3 Mode Select Key
The Mode Select key (Figure 2–1) can lock the loader transfer assembly
into the enclosure as well as lock the magazine closed.
The Mode Select key has four modes; three modes are for operational use,
and one is for head cleaning and servicing:
•

OCP Disabled

•

Automatic

•

Manual

•

Service

2–10 Operation

2.3.1 Operating Modes
The following modes are for operational use:
•

OCP Disabled mode — Automatically loads and unloads cartridges
as necessary during backup procedures. Operations stop if you are
copying data to tape and either the storage capacity of the last tape
cartridge is exceeded, or no tape cartridge is in the next sequential
slot in the magazine.
To lock the TF837 subsystem into the enclosure and lock the receiver,
set the Mode Select key to OCP Disabled mode. The OCP indicators
are disabled.

•

Automatic mode — Is the default, or ‘‘normal,’’ mode of the TF837
magazine tape subsystem. This mode automatically loads and unloads
cartridges as necessary during backup procedures. Operations stop
if you are copying data to tape and either the storage capacity of the
last tape cartridge is exceeded, or no tape cartridge is in the next
sequential slot in the magazine.
To lock the TF837 subsystem into its normal operating position in the
enclosure but leave the receiver unlocked, set the Mode Select key to
Automatic mode. The receiver can be opened; all OCP buttons are
enabled.

•

Manual mode — Is similar to Automatic mode, with one major
exception. In Manual mode, you select one tape cartridge at a time;
then press the Slot Select button to select the next cartridge. This
mode is most useful for, but not restricted to, copying specific files to
or from tape.
To lock the TF837 subsystem into the enclosure, set the Mode Select
key to Manual mode. The receiver is unlocked and can be opened; all
OCP buttons are enabled.
NOTE
During Manual mode, the cartridge returns to the magazine,
but the current Slot Select indicator does not advance forward
to the next available cartridge.

Operation 2–11

2.3.2 Service Mode
Use Service mode to perform head cleaning, jam recovery, and servicing
procedures.
To unlock the TF837 subsystem from its enclosure and remove it from its
normal operating position, set the Mode Select key to Service mode. The
receiver is unlocked and can be opened.
Two mechanical stops (Figure 2–6) are associated with Service mode:
first and second. The first stop allows you to pull the TF837 subsystem
forward from the enclosure to:
•

Remove a faulty loader transfer assembly

•

Remove a faulty operator control panel

•

Remove a faulty power supply

•

Perform the head cleaning procedure

By pressing the first stop, you can access the the second stop, which
allows you to pull the rear chassis forward from the cabinet. This position
provides access to the following FRUs:
•

TK71 tape drive

•

Handle motor assembly

•

TFK70 DSSI controller module

For specific instructions about how to access the internal assemblies of
the TF837 subsystem, see Chapter 5.

2–12 Operation

FIRST
MECHANICAL
STOP

SECOND
MECHANICAL
STOP

MECHANICAL
EJECTION LEVER

SHR-0012-90
SHR-X0147C-90-CPG

Figure 2–6

Mechanical Stops Associated with Service Mode

3
Power-On Self-Test
This chapter describes the power-on self-test (POST) sequence associated
with three major TF837 magazine tape subsystem assemblies:
Loader transfer assembly
TK71 tape drive
TFK70 DSSI controller module

3.1 TF837 Initialization
Powering on the TF837 subsystem initiates POST and initializes the
subsystem.
During POST, all of the subsystem’s OCP indicators turn on—including
the Magazine Fault and Loader Fault indicators, generally within 15
seconds. Then, if no errors occur, the TFK70 DSSI controller module turns
off the OCP indicators, except for Power On, and initiates a magazine
scan.
Once initialization is complete, the Slot Select, Load/Unload, and Eject
buttons become active, provided the Mode Select key is in any position
other than OCP Disabled.
Upon successful execution of POST, and assuming the TF837 subsystem
has a magazine with a cartridge in slot 0, the following indicators turn
on:
Power On
Eject
Load/Unload
Slot Select
Slot 01
POST failures display in the Magazine Fault and Loader Fault indicators.
For information on magazine and loader faults, refer to Chapter 5.

Or the indicator of the first available slot turns on.
3–1

3–2 Power-On Self-Test

3.2 Loader Transfer Assembly
This section describes how POST operates within the loader transfer
assembly. Information includes mechanical status and drive handle
status checks.
Some POST tasks and subtests are as follows:
•

Tests ROM, RAM, and CTC

•

Initializes channel A (RS422 host port)

•

Initializes CTC, RAM, and EEPROM

•

Initializes loader transfer assembly mechanics

•

Initializes the loader transfer assembly electronics

•

Sets motors, sensor indicators, and OCP indicators to default states

3.2.1 Checking Mechanical Status
Before checking mechanical status, the loader transfer assembly checks
the status of the drive handle. If the drive handle is up (open), POST
closes it (provided the cartridge is not in transition in the drive).
During POST, the loader transfer assembly checks whether the:
•

Picker arm moved to its home position (down) (Figure 3–1)

•

Elevator contains a cartridge

•

Elevator moved to its home position

If the elevator contains a cartridge, the following process occurs:
1. The subsystem restores the cartridge to its original slot.
2. The subsystem moves the elevator to its home position.
3. POST determines whether the receiver is open.
4. If the receiver is closed, the elevator moves to slot 0. (During this
move operation, the elevator’s ELEVPOS sensor scans the magazine
slots to determine which slots contain cartridges and the type of
cartridge (CompacTape or CompacTape II cartridge) in those slots.)

Power-On Self-Test 3–3

PICKER ARM
SHR-0060-89
SHR_X1080_89_CPG

Figure 3–1

Home Position of the Elevator

3–4 Power-On Self-Test

3.3 TK71 Tape Drive
The TK71 drive module executes POST during power-up or reset.
Successful execution of POST is indicated by the Magazine Fault indicator
(on the TF837 OCP) turning off and remaining off.

3.4 TFK70 DSSI Controller Module
Successful execution of POST on the TFK70 DSSI controller module
is indicated by the module’s green indicator (Figure 3–2). Successful
execution takes approximately 4 seconds. The red indicators on the
module indicate POST failure (the green indicator is not on).
NOTE
If the TFK70 DSSI controller module fails POST, the controller
module does not establish communications with the loader
transfer assembly. All OCP indicators should remain on, except
for the Loader Fault indicator.
Table 3–1 describes the fatal POST codes that the red indicators display.
Table 3–1 TFK70 DSSI Controller Module POST Error Codes
Code1

Description

11111
00001
00010
00011
00100

68000 tests never started executing
68000 CPU test error
68000 EEPROM test error
68000 tri-ported RAM test error
EEPROM test error

00101
00110
00111
01000
01001

SWIFT chip test error
SWIFT external loopback test error
68000 semaphore register test error
Subsystem UART test error
Subsystem UART external loopback test error

01010
01011
01100
01111
10000

BUDI chip test error
Interprocessor communication test error (68000 detected)
Watch dog timer test failed
80186 CPU test error
80186 EEPROM test error

1 (MSB)XXXXX(LSB)

Power-On Self-Test 3–5

Table 3–1 (Cont.) TFK70 DSSI Controller Module POST Error Codes
Code1

Description

10001
10010
10011
10100
10101

80186 local RAM test error
80186 timers test error
Gap detection test error
80186 MPSC command channel test error
80186 MPSC command channel external loopback test error

10110
10101
11000
11001
11010

80186 MPSC data channel test error
80186 MPSC data channel external loopback test error
Drive cable test error
80186 semaphore register test error
Interprocessor communication error (80186 detected)

11100
11101
11110
11111

Reset encountered but not expected
Unable to write error to EEPROM
Local 68000 memory verification error (TPRAM)
Unexpected exception

1 (MSB)XXXXX(LSB)

3.4.1 Recording POST Errors in EEPROM
TFK70 DSSI controller module errors found during POST are recorded in
on-board EEPROM. The error data consists of error codes, test numbers,
and indicator error codes.
Although POST errors are recorded in EEPROM, testing continues
through the last test. The error indicators on the controller module
reflect the last POST error detected, but the EEPROM retains error data
from the last ten test failures.
NOTE
You can access the POST errors by using the DUP local program,
HISTRY (Section 4.7).

3–6 Power-On Self-Test

GREEN

RED (LSB)
RED
RED
RED

LOADER
TRANSFER ASSEMBLY
COMMUNICATIONS
CONNECTOR

REMOTE
FRONT
PANEL
CONNECTOR
(NOT USED)

POWER
CONNECTOR

RED (MSB)
D1
NOT USED

J2
J7
E14

E46
J5

DSSI COMMUNICATIONS
CONNECTOR

TAPE DRIVE
COMMUNICATIONS
CONNECTOR

1
0
TAPE SERVER SW1

* SEE NOTE

NODE ID
SW2 SW3 SW4
2
1
0
2
2
2

* NOTE: Set to 1 to disable communications with TAPE SERVER.
Set to 0 to enable communications with TAPE SERVER.
SHR-X0055-90

Figure 3–2

TFK70 DSSI Controller Module Diagnostic Indicators

Power-On Self-Test 3–7

3.5 Power-On Self-Test Failures
POST failures usually indicate a failing FRU. Chapter 6 describes the
removal and replacement procedures for failing FRUs.

4
Local Programs and Utilities
This chapter describes how to to access resident local programs and
utilities on the TF837 magazine tape subsystem.
NOTE
You need specific privileges to access these programs and utilities.
The local programs and utilities described in this chapter are:
•

PARAMS (Parameter Configuration Utility) — Displays or changes
subsystem parameters (Section 4.2).

NOTE
The following programs are used primarily for diagnostic
purposes.
•

DIRECT (Directory) — Lists the available local programs
(Section 4.3).

•

DRVTST (Drive Test) — Verifies the correct functioning of subsystem
hardware (Section 4.4); it is a comprehensive subtest of DRVEXR.

•

DRVEXR (Drive Exerciser) — Exercises the TF837 subsystem and
TK71 tape drive (Section 4.5).

•

LOADER — Exercises the internals of the loader transfer assembly
(Section 4.6).

•

HISTRY (Historical Statistical Data) — Displays information about
the TF837 subsystem (Section 4.7).

•

MAGTST (Magazine Test) — Examines the types of cartridges in the
magazine (Section 4.8).

•

MAGINI (Magazine Test and Initialization) — Executes the MAGTST
utility and destroys any existing labels and an amount of data that
may be on the cartridge (Section 4.9).

4–1

4–2 Local Programs and Utilities

4.1 Accessing Local Programs
Access local programs with the VMS command:
$ SET HOST/DUP

If you have the correct VMS system privileges, this command allows
you to access the local programs, which reside in ROM on the TF837
subsystem. If you execute SET HOST/DUP, communications between
the host system and the TF837 subsystem are through diagnostic utilities
protocol (DUP). Drive operations under DUP are controlled through
the local programs. When you exit the program, control returns to the
operating system.
The following example shows the sequence of commands to use to access
local programs. These commands are used for the VMS operating system,
version 5.4 or later.
$ SHOW DEVICES MI (or SHOW CLUSTER)

; to learn the nodename
; of the tape device.

$ SET DEVICE/noavailable device-name ; to make the device
; unavailable to users.
$ SET HOST/DUP/SERVER=MSCP$DUP/TASK=PARAMS nodename

NOTE
A typical example of a device nodename is T7X3MA. This default
nodename is comprised of the module serial number, which is
assigned randomly during manufacturing. You can change this
nodename by using the PARAMS utility.
Note also that you can substitute any of the previously listed
programs and utilities after the qualifier /TASK.

4.1.1 Error Message after Executing SET HOST/DUP
If you receive an error message when using the SET HOST/DUP
command, you may need to load the FYDRIVER program, as follows:
$ MCR SYSGEN

; to access SYSGEN.

$ SYSGEN> LOAD FYDRIVER

; to load FYDRIVER, prerequisite
; to using diagnostics.

$ SYSGEN> CON FYA0/NOADAP ; to configure FYDRIVER.
$ SYSGEN> EXIT

Local Programs and Utilities 4–3

4.2 PARAMS Utility
Use the PARAMS utility to display or change internal parameters for the
TF837 magazine tape subsystem. The subsystem’s parameters are factory
set, but system managers may want to change them.
Once you invoke the PARAMS utility through SET HOST/DUP, the
terminal displays the following prompt:
PARAMS>

This prompt indicates that you have accessed the PARAMS utility.
Table 4–1 lists the subsystem parameters accessible at the PARAMS>
prompt.

4.2.1 Displaying, Setting, and Saving Parameters
At the PARAMS> prompt, you can use the following commands:
•

SHOW /ALL to display subsystem parameters

•

SHOW parameter to display a specific parameter

•

SET parameter to set a parameter

•

WRITE to save changes to parameters

4–4 Local Programs and Utilities

Table 4–1 Summary of TF837 Subsystem Parameters
Parameter

Definition

UNITNUM

The TMSCP unit number.

SYSTEMID

The DSSI bus controller module’s 48-bit system ID.

NODENAME

The nodename for the TF837 subsystem.

FORCENAME

1 = Default nodename in use. (Derived from the
subsystem serial number.)
0 = Uses value set in NODENAME.

FORCEUNI

Determines whether the TMSCP unit number, or DSSI
node ID is used.
1 = Uses the DSSI node ID.
0 = Uses the TMSCP unit number.

CSHFLTM0

Cache flush timer. Maximum seconds required for tape
server to wait for cache to empty following a tape server
disconnect sequence. Zero indicates no timeout. The
default value is 60 seconds.
If the tape server cannot flush its write-back cache and
perform a cleanup sequence, the controller module will
reset and restore itself.

DATAOPTMO

Data operation timer. Maximum time for a data
operation to complete. Zero indicates no timeout. The
default value is 180 seconds.
A data operation is defined as the time it takes to
complete an end-to-end data transfer between the
system and either the tape or the cache, depending on
the transfer mode. If the data operation cannot complete
within the timeout period, the controller module will
bugcheck and reset itself.

SYSTIME

Displays the current time and date in machine-readable
format.

Local Programs and Utilities 4–5

4.2.1.1 SHOW /ALL Command
Use the SHOW /ALL command to display the settings of subsystem
parameters:
PARAMS> SHOW /ALL

When typing the SHOW /ALL command, be sure to leave a space between
SHOW and /ALL. The SHOW /ALL command displays the following:
Parameter
---------

Current
-------

Default
-------

Type
----

Radix
-----

UNITNUM
0
FORCEUNI
1
NODENAME
TFBL50
FORCENAME
1
SYSTEMID
BC2D000D0000
CSHFLTMO
60
DATAOPTMO
180
SYSTIME
000000021D481D80

0
1
T74ZJ9
0
BC2D000D0000
60
180
000000021D481D80

Word
Boolean
String
Boolean
Quadword
Word
Word
Quadword

Dec
0/1
ASCII
0/1
Hex
Dec
Dec
Hex

NOTE
To display a specific parameter, type SHOW parameter. For
example, SHOW SYSTEMID.
4.2.1.2 SET Command
Use the SET command to change internal TF837 subsystem parameters.
Table 4–1 summarizes SET and SHOW command parameters.
The syntax for the SET subsystem command is:
PARAMS> SET parameter value

In the previous example, parameter is the name of the parameter to
be set, and value is the value you want assigned to the parameter. If
abbreviated, the first matching parameter is used without regard to
uniqueness.
NOTE
Use the WRITE command to save the changes made while using
the SET command.

4–6 Local Programs and Utilities

4.2.1.3 WRITE Command
Use the WRITE command to save, in nonvolatile memory, the changes
you have made using the PARAMS utility. The WRITE command is
similar to the VMS SYSGEN WRITE command. Refer to the following
example:
PARAMS> SET NODENAME TAPE1
PARAMS> SET UNITNUM 18
PARAMS> WRITE
Changes require controller initialization, ok? [Y/(N)] Y

NOTE
To save changes made using PARAMS, you must answer YES.
This sets the TF837 subsystem’s nodename to TAPE1, and the TMSCP
unit number to 18. Executing WRITE and answering YES to the question
saves the nodename and unit number in EEPROM.
NOTE
When you answer YES to the controller initialization prompt, your
changes take effect immediately and program control returns to
the VMS command prompt. The TF837 subsystem then restarts
and executes the POST sequence.
4.2.1.4 EXIT Command
The EXIT command ends the PARAMS utility. The word Completed
appears on the screen.

4.3 DIRECT Program
The DIRECT program provides a directory of all available local programs
resident in the TF837 magazine tape subsystem. An example of a
DIRECT program display follows:
Copyright © 1990 Digital Equipment Corporation
DIRECT
V1.0 SD
DRVEXR
V1.0 SD
DRVTST
V1.0 SD
LOADER
V1.0 SD
HISTRY
V1.0 SD
PARAMS
V1.0 SD
MAGTST
V1.0 SD
MAGINI
V1.0 SD
End of Directory

Local Programs and Utilities 4–7

4.4 DRVTST Program
The DRVTST program is a pass/fail test that invokes a comprehensive
test of the TK71 tape drive hardware. No statistics are sent to the host
upon completion of this test. Testing terminates with either a Test
Complete message or a fatal error message. An example of the dialogue
follows:
Message Type

Message

Information

Question

Write/read anywhere on the medium? [1=YES/(0=NO)]
Answering 0 (NO) results in a read-only test. (Successful
execution of the read-only test requires a previously written
tape.) Answering 1 (YES) results in the next question being
asked.

Question

User data will be corrupted, proceed?
[1=YES/(0=NO)]
Answering 0 (NO) results in a read-only test. Answering 1
(YES) permits write and read operations anywhere on the
tape.
CAUTION
Before answering 1 (YES), be sure a scratch tape is
installed.

Information

8 minutes to complete.

Termination

Completed.

Fatal error

Unit is currently in use.

Fatal error

Operation aborted by user.

Fatal error

XXXX - Unit diagnostics failed.
XXXX is either a program error or loader error. Note loader
errors start with FFXX.

Fatal error

XXXX - Unit read/write test failed.
XXXX equals failure data described in TMSCP error
specification.

NOTE
If the write-protect switch on the tape cartridge is set to write-protect,
and the answer to the second question above is 1 (YES), the device does
not allow the test to run and the error message 2006 - Unit read/write
test failed displays. In this case, the test has not failed but was
prevented from running.

4–8 Local Programs and Utilities

4.5 DRVEXR Progam
The DRVEXR program exercises the TK71 tape drive. It is an intensive
data transfer test and indicates the overall integrity of the device. The
dialogue for DRVEXR includes:
Message Type

Message

Information

Question

Write/read anywhere on the medium? [1=YES/(0=NO)]
Answering 0 (NO) results in a read-only test. Successful
operation of the read-only test requires a previously written
tape. Answering 1 (YES) results in the next question being
asked.

Question

User data will be corrupted, proceed?
[1=YES/(0=NO)]
Answering 0 (NO) results in a read-only test. Answering 1
(YES) question permits write and read operations anywhere
on the tape.
CAUTION
Before answering 1 (YES), be sure a scratch tape is
installed.

Question

Test time in minutes? [10-100]
Answering from 10 to 100 minutes runs the test for the time
you specify.

Information

ddd minutes to complete.

Information

dddddddd bytes read.

Information

dddddddd bytes written.

Termination

Complete.

Fatal error

Unit is currently in use.

Fatal error

Operation aborted by user.

Fatal error

XXXX - Unit diagnostics failed.

Fatal error

XXXX - Unit read/write test failed.

Local Programs and Utilities 4–9

4.6 LOADER Program
The local LOADER program analyzes the magazine through the SCAN
MAGAZINE command and displays the results. These results can
include:
•

Compatible cartridge (TK50 or TK52)

•

Noncompatible cartridge

•

Empty slots

The diagnostic test then proceeds to load and unload the number of
requested cartridges, ignoring noncompatible cartridges and empty slots.
The default is seven cycles. The following are two examples of LOADER
program output:
Diagnostic Software
Property of Digital Equipment Corporation
** Confidential and Proprietary **
Copyright © 1990 Digital Equipment Corporation
Number of loader cycles to perform? [1-(7)-21]
Slot number 0: compatible cartridge
Slot number 1: compatible cartridge
Slot number 2: compatible cartridge
Slot number 3: compatible cartridge
Slot number 4: empty
Slot number 5: compatible cartridge
Slot number 6: compatible cartridge
^C
Abort acknowledged. Cleanup may take several seconds.
3 out of 7 load cycles were completed.
Operation aborted by user.
Diagnostic Software
Property of Digital Equipment Corporation
** Confidential and Proprietary **
Copyright © 1990 Digital Equipment Corporation
Number of loader cycles to perform? [1-(7)-21] 1
Slot number 0: compatible cartridge
Slot number 1: empty
Slot number 2: NON compatible cartridge
Slot number 3: compatible cartridge
Slot number 4: empty
Slot number 5: compatible cartridge
Slot number 6: compatible cartridge
NON COMPATIBLE TAPES WILL NOT BE TESTED.
Completed.

4–10 Local Programs and Utilities

4.7 HISTRY Program
The HISTRY program displays information about the history of the
TF837 magazine tape subsystem. The output generated by this program
is described in the following table. (If no errors have been logged, no
hexadecimal codes are displayed in the HISTRY output.)
Screen Display

Field Meaning

TF837

Product name

EN87988231

Drive serial number

T7X3MA

Nodename

A01

Module revision level

V1.0

Firmware revision level1

Power-up hours

20-character hexadecimal
code(s)3

Represents last 10 firmware-detected errors from
most recent to oldest

8-character hexadecimal
code(s)2

Represents last 10 POST-detected errors from
most recent to oldest

Completed.

–

1 For another method of determining the firmware revision, type the following at the $

prompt: SET HOST/DUP/Server=Dup/TASK=PARAMS nodename. Then type the following
at the PARAMS> prompt: SHOW REV. The date associated with the firmware revision is
accessible through the PARAMS utility.
2 This displays the last 10 POST-detected error codes. For a listing of POST-detected error
codes, see Appendix B.
3 This displays the last 10 firmware-detected error codes.

Local Programs and Utilities 4–11

The following is an example of HISTRY data output:
Diagnostic Software
Property of Digital Equipment Corporation
** Confidential and Proprietary **
Copyright © 1990 Digital Equipment Corporation
TF837
EN00400267
T7YLBB
A00
V1.0A
117
4404009377FF73572360
4404009377FC56D48A60
A71200937662D5ECB980
A71200937660A65FCA60
40070093765C0803C500
A7120093736CE658ADE0
40030000000005F5E100
40030000000005F5E100
04060565
04280565
04060565
04060565
04280565
04100565
04280565
04060565
04060565
04060565

In the previous example, the first eight 20-character codes are firmware
entries. The next ten 8-character codes are POST-detected error entries.
The four leftmost characters in a firmware-detected error entry correspond
to DSSI error/event codes.
The four leftmost characters in a POST-detected error entry correspond to
the detailed error codes.
The two rightmost characters in a POST-detected error entry correspond
to the POST error indicators on the TFK70 DSSI controller module.
For example, the first POST-detected entry is 04060565. The 65 is a
hexadecimal code which, when converted to binary code, is 0110 0101.
The five least significant bits of the code correspond to error indicators in
Table 3–1. In this example, 0 0101 is a SWIFT chip test error.

4–12 Local Programs and Utilities

4.8 MAGTST Program
Use the MAGTST program to examine each magazine slot. This program
verifies that writeable cartridges are available, and is a useful program to
run before executing the VMS BACKUP procedure.
Access the MAGTST program with the SET HOST/DUP command.
When you use this command, the test automatically executes.
In the following example, MAGTST is the local program; TF0422 is the
nodename.
$ SET HOST/DUP/SERVER=mscp$dup/task=magtst tf0422

The MAGTST program examines each magazine slot for a contiguous
writeable cartridge. If the utility finds an empty slot, a writeprotected cartridge, a TK74 or TK50 initialized cartridge, or an
unrecognizable cartridge, it reports the failure message, Invalid Magazine
Configuration. Note, however, that in the case of an empty slot, the
configuration is invalid only if a cartridge follows the empty slot.
The following are three examples of MAGTST output:
Copyright © 1990

Digital Equipment Corporation

No cartridge found in slot #0
No cartridge found in slot #1
Write protected cartridge found in slot #2
No cartridge found in slot #3
TK50 cartridge found in slot #4
No cartridge found in slot #5
No cartridge found in slot #6
Magazine configuration is INVALID.

In the above example, the configuration is invalid because you cannot
execute a BACKUP operation to a TK50 (CompacTape) cartridge in slot 4.
Before running BACKUP, you must replace it with a TK70 (CompacTape
II) cartridge.
Copyright © 1990

Digital Equipment Corporation

Non-compatible cartridge found in slot #0
*** VALID *** cartridge found in slot #1
2 out of 7 slots were examined.
FF85 - Unit diagnostics failed.

NOTE
FF85 is an error code indicating a TF837 FRU error.

Local Programs and Utilities 4–13

Digital Equipment Corporation

*** VALID *** cartridge found in slot #0
*** VALID *** cartridge found in slot #1
*** VALID *** cartridge found in slot #2
No cartridge found in slot #3
No cartridge found in slot #4
No cartridge found in slot #5
No cartridge found in slot #6
Verified.

4.9 MAGINI Program
The MAGINI program writes random data, at the beginning of the tape,
to a writeable cartridge. It writes over any label that may have existed,
allowing the BACKUP/REWIND command to create labels itself. This
program executes automatically when you use the SET HOST/DUP
command.
NOTE
You can use this program for functional verification during
installation.
The MAGINI output is identical to the MAGTST output; the only
difference is the message, Verified and Cleared, during a successful
configuration.
CAUTION
The MAGINI program destroys any existing labels and an amount
of data that may be on the cartridge.

5
Problem Resolutions, Error Conditions,
and Jam Recovery
This chapter describes problem resolutions specific to the TF837
magazine tape subsystem, error conditions, and jam recovery procedures.
Figure 5–1 shows the TF837 subsystem.
LOADER TRANSFER ASSEMBLY
INTERLOCK
SWITCH

DSSI
CONTROLLER
MODULE

RIGHT
CAPTIVE
SCREWS

LATCH
OPERATOR
CONTROL
PANEL
(OCP)

TK71
TAPE
DRIVE

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

HOME POSITION
OF ELEVATOR
SHR-X0147F-90-CPG

Figure 5–1

TF837 Magazine Tape Subsystem

5–1

5–2 Problem Resolutions, Error Conditions, and Jam Recovery

5.1 Nondetectable FRU Failures
Table 5–1 describes possible scenarios associated with field replaceable
unit (FRU) failures not detectable through diagnostics.
Table 5–1 Fault Matrix
FRU

Possible Failure Scenario

Interlock switch

After you slide the TF837 subsystem
forward for head cleaning or service, the
Power On indicator remains lit.

Tape drive communications cable

After you replace either a faulty drive or a
subsystem assembly, the power is on, but
the subsystem still fails.

Handle motor assembly

Same as above. Characterized by
subsystem retry errors.

Power supply assembly

When connected to a known good source
of power, and the power switch is set to 1
(on), the subsystem does not power up and
the Power On indicator remains off.

Operator control panel

After you replace either a faulty controller
module or other FRU, either the OCP
buttons or indicators do not function.
All indicators turn off briefly at power-on.

Fan

Visual inspection required.

Problem Resolutions, Error Conditions, and Jam Recovery 5–3

5.2 Error Conditions
This section describes error conditions, failure influences, and soft error
rates. In addition, it includes information on magazine and loader faults.
See Table 5–2 for a list of common failures, causes, and corrections.

5.2.1 Detecting Common Failure Influences
The TK71 tape drive may appear to be the failing unit due to the
operation being performed at the time of failure (such as backup).
However, it is important to understand that many factors influence
failures.
Some of the more common factors that influence failures are:
•

Defective media

•

Operator or user errors

•

Incorrect backup commands

•

Poor power or grounding

NOTE
Before you replace the drive, ensure that any problems you find
are not due to the above factors.

5.2.2 Detecting Soft Error Rates
Soft errors are normally considered to be events rather than errors. In the
case of soft errors, it is important to realize that no data has been lost.
For a write, the data is rewritten. For a read, retries are performed.
Some of the variables that create soft errors are:
Media dropouts
Temperature of media (not acclimatized)
System bus activity
Applications
Head wear
Contamination
Foreign debris in tape path

5–4 Problem Resolutions, Error Conditions, and Jam Recovery

Table 5–2 Common Failures, Causes, and Corrections
Symptom

Probable Cause

Possible Fix

Volume not software
enabled

Drive is not loaded
or was unloaded by
software

Ensure that the yellow
indicator on the drive is on
(tape loaded and ready for
use).

TK50 formatted
cartridge in a TK71
drive

Use the correct cartridge.

Bad cartridge or
incorrectly written
calibration tracks

Try another cartridge.

Bad drive or dirty
head

Clean the head.

Failure to mount or
initialize with new
media

Bad media

Clean the head and retry
with known good media.

All three TF837 OCP
indicators flashing

Drive failed POST or
detected a hard error
during operation

Attempt to clear the error
by pressing the Unload
button on the drive. If
the error does not clear,
you have a drive hardware
failure or a power problem.

Green indicator on
drive flashing

Calibration error

Clear the error by pressing
the Unload button on
the drive. Try another
cartridge. If the error
repeats, you have a drive
hardware failure or more
than one bad cartridge
(physically damaged or bad
calibration tracks).

Cartridge stuck in
drive with tape on
takeup reel

Hard drive error

Attempt recovery by
pressing the Unload button
on the drive.

Drive leader runaway

Mispositioned
cartridge leader

Inspect the cartridge leader
for correct position. Retire
the cartridge from use if you
cannot reposition the leader.

Problem Resolutions, Error Conditions, and Jam Recovery 5–5

Changes in soft error rates for any particular drive and cartridge are
more significant than any absolute number of soft errors. This is due to
the variables described above.
When examining the drive error count, soft errors or events and hard
errors can be detected. For example, an error will occur if you give the
wrong label name during a mount. Be sure the errors you are interpreting
are indicative of a real hardware problem before replacing the drive.
NOTE
All tapes contain some number of dropouts. Although these
are imperfections in the tape, the tape is not considered to be
defective. The hardware and software are designed to deal
with these known imperfections. Dropout testing is performed
on samples of media by Digital’s vendors and meet all of the
specifications of Digital Equipment Corporation.

5.3 Magazine and Loader Faults
Error indications fall into two main categories:
•

Magazine Fault — Is an operator-correctable condition in most
cases, and is indicated by the Magazine Fault indicator being on.

•

Loader Fault — Is a condition that most likely requires service from
the Customer Services organization. It is indicated by the Loader
Fault indicator being on.

5.3.1 Magazine Fault Description
A magazine fault indicates an inconsistency between what the loader has
done with a cartridge and the actual state detected by the subsystem.
Inconsistent magazine status can occur when:
•

The magazine is full and an extra cartridge is in the drive

•

The magazine is full and an extra cartridge is in the elevator

•

The flag is set in the magazine but no cartridge is present

•

The loader has loaded a cartridge into the drive but the cartridge has
been removed

•

An unrecognized cartridge is in the magazine

5–6 Problem Resolutions, Error Conditions, and Jam Recovery

When the above conditions are present, the Magazine Fault indicator is
on, indicating a situation that can be corrected by the operator. The Eject
indicator is also on to inform the operator that this is the only function
available at this time.
Slot indicators are as follows:
•

Slots 6 and 0 light to indicate the problem is a cartridge in the drive
that was not loaded by the loader.

•

Slots 5 and 0 light to indicate the problem can be corrected by
replacing any missing cartridges in the magazine.

NOTE
The slot 0 indicator is not a Slot Select indicator; rather, it is on
in all error conditions to indicate that an error has occurred.

5.3.2 Loader Fault Description
A loader fault indicates that the TF837 subsystem has detected a fatal
error. In many cases, the subsystem has retried this error three times
before failure. All loader faults (including magazine faults) generate an
error log as well as light the Loader Fault indicator and generate an
associated subcode.
The Loader Fault indicator indicates both loader and drive errors. The
presence of a fault is indicated by the following slot indicators:
•

Slots 4 and 0 light to indicate a controller module fault.

•

Slots 5 and 0 light to indicate a loader fault.

•

Slots 6 and 0 light to indicate a drive fault.

NOTE
Error indicators do not flash. During hardware failures, action is
determined by the DSSI bus controller module.
5.3.2.1 Clearing a Loader Fault
When a loader fault occurs, the Load/Unload and Eject indicators are on.
When you press the Load/Unload button, the TF837 subsystem attempts
to clear the error and opens the receiver to let you access the magazine.
NOTE
After a successful initialization, the DSSI bus controller module
initiates a magazine scan to determine which slots in the
magazine contain cartridges.

Problem Resolutions, Error Conditions, and Jam Recovery 5–7

5.4 Jam Recovery Procedure
On occasion, a cartridge may jam in the elevator or drive mechanism.
A jam is indicated when the Magazine Fault indicator on the TF837
operator control panel is on, a cartridge cannot load or unload, or an
unusual sound is in the motor.
This section describes how to remove cartridges from a jammed loader in
such a manner that neither the loader nor data is harmed. This section
does not provide information on fault finding, repair, or maintenance of
the loader.
CAUTION
Lift the magazine slowly. Remember, excessive force could disrupt
the operation of other devices in the same storage array.

5.4.1 Loader Action During a Jam
If a jam occurs during a cartridge movement, the loader attempts to move
the cartridge back to a known position. There are three such positions:
•

Cartridge fully in the drive

•

Cartridge fully on the elevator

•

Cartridge fully in its correct magazine slot

The position used depends on the movement that fails. The following
table shows this interrelationship:

Going from

Going to

Movement Attempted
after a Jam

Magazine slot

Elevator

Go back to slot

Elevator

Drive

Go back to elevator

Drive

Elevator

Go back to drive

Elevator

Magazine slot

Go back to elevator

5–8 Problem Resolutions, Error Conditions, and Jam Recovery

In some situations, a jam may prevent the return of the cartridge to a
known position. In such cases, the loader stops, and no further action
occurs. This means that the cartridge may be found in two additional
places:
Cartridge Location

Position

Cartridge fully in its correct magazine slot

Known

Somewhere between the magazine slot and the elevator

Unknown

Cartridge fully on the elevator

Known

Somewhere between the elevator and the drive

Unknown

Cartridge fully in the drive

Known

To recover the data, it is important to ascertain the locations of the
cartridges. In certain circumstances, you may have to maneuver the
cartridges manually before trying to remove them; otherwise damage
could result. The unknown positions are of particular concern.
You will need the following tools:
•

A flashlight

•

A nonmagnetic rod, approximately 23 cm (9 in) long

•

An adjustable inspection mirror

The following instructions are to assist you with removing tape cartridges;
note, however, that they do not cover all possible situations. Follow each
step as instructed. The points do not necessarily follow in numerical
order.

Problem Resolutions, Error Conditions, and Jam Recovery 5–9

5.4.2 Terminology and Definitions
Be sure you are familiar with the terminology used here before
proceeding.
•

Left and Right Sides — The loader as seen from the front.

•

Clockwise and Counterclockwise — The loader as seen from above
when referring to a vertical axis.

•

Mode Select Key — Located on the left side of the front panel;
unlocks the TF837 subsystem from the storage array.

•

Mechanical Stop — A mechanical stop (Figure 5–2) prevents the
TF837 subsystem from being accidentally pulled out too far. In this
position, the loader transfer assembly can be swung open to allow
access to the inner mechanisms.

•

Transfer Assembly — The detachable front half of the loader.

•

Elevator — The mobile portion of the loader transfer assembly that
is responsible for loading and unloading cartridges.

Before you begin, note the following information:
•

Are indicators on or off on the front panel?

•

In what position is the Mode Select key?

•

How many cartridges are in the loader?

•

What type of cartridges are they?

•

What command is in progress?

•

What is the error code on the subsystem?

Set the Mode Select key to Service mode and press the Eject button.

5–10 Problem Resolutions, Error Conditions, and Jam Recovery

FIRST
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106B_89

Figure 5–2

First Mechanical Stop

Problem Resolutions, Error Conditions, and Jam Recovery

5–11

5.4.3 Steps to Follow During the Jam Recovery Process
Step 1: Power Down the Loader
Power down the loader; the switch is at the back.
Step 2: Check the Receiver
If the receiver is already open (Figure 5–3) and no magazine is present,
continue to step 15. If the receiver is already open and a magazine is
present, then continue to step 14.
If the receiver door is fully closed, do not touch it. Continue to step 3.
If the receiver door is partially open, pull gently at the top of the door to
see if it will open fully. If it does, continue to step 14. If it does not open
fully, do not force; rather, attempt to close it. If it does not close easily, let
it remain and continue to step 3.
Step 3: Note the Position of the Cartridges
This step is essential to jam recovery. Look through the receiver
window, and note any cartridge that is partway in or out of its slot.
Remember, if all seven cartridges are present, another cartridge or
cleaning cartridge may still be in the machine. Continue to step 4.

5–12 Problem Resolutions, Error Conditions, and Jam Recovery

FRONT
BEZEL

Ejec

Loa

Slot

Pow

Wri

d/U

nloa

Sele

er O

te P

Tap

Driv

Loa

rote

e In

Use
Cle
anin

Use

g Ta

e Fa

d Fa

ult

SHR-X0046-90

Figure 5–3

Open Receiver

Problem Resolutions, Error Conditions, and Jam Recovery 5–13

Step 4: Unlock the TF837 Subsystem from the Storage Array
Unlock the TF837 subsystem from the storage array by setting the Mode
Select key to Service mode. Gently but firmly pull the subsystem out to
the first stop (32 cm or 12.5 inches) (Figure 5–2). Be careful not to use
excess force as it could disrupt the operation of other devices in the same
array. Continue to step 5.
Step 5: Check for a Jammed Cartridge
Look for a cartridge jammed inside. There are three places to look (you
may need to use a flashlight):
•

Through the receiver window, note the number of cartridges present.

•

Through the rectangular opening in the right side of the sheet metal.

•

From the top, look down through the gap where the loader transfer
assembly and rear chassis meet.
NOTE
Do not confuse an open drive handle with a cartridge.

5–14 Problem Resolutions, Error Conditions, and Jam Recovery

Step 6: Unlatch the Loader Transfer Assembly
You can unlatch the loader transfer assembly by lifting the latch on the
right side (Figure 5–1). The loader transfer assembly can then be swung
to the left; be careful not to let it hit the left neighboring device if there is
one. You now have a clear view of the rear of the elevator and access to
the front panel of the tape drive. Continue to step 7.
Step 7: Check for the Presence or Position of a Cartridge
If no magazine is present, continue to step 18.
If a cartridge is not stuck between the elevator and the magazine,
continue to step 8.
If a cartridge is stuck partway between the elevator and the magazine,
push it forward into the magazine by using a rod or similar tool. Turn the
left shaft (Figure 5–4) counterclockwise as far as it will go. As you turn
the shaft, you will see the black slide on the elevator move toward you.
Continue to step 8.
Step 8: Open the Receiver Door
A rectangular opening in the sheet metal on the right side exposes two
metal uprights (Figure 5–1). The rear one is fixed, but the front one forms
part of the receiver opening mechanism. Firmly squeezing these two parts
together opens the receiver door. If it opens, continue to step 9.
If the receiver fails to open correctly, push it closed again, locate and clear
the jam before attempting to reopen the door. Possible things to note are:
•

Is the Mode Select key set to Service mode?

•

Did you turn the left shaft fully counterclockwise?

•

Is the magazine correctly seated?

•

Is anything caught between the outer side walls of the receiver and
the inner wall of the loader transfer assembly?

Problem Resolutions, Error Conditions, and Jam Recovery 5–15

RIGHT
SHAFT
AS
VIEWED
FROM
FRONT

LEFT
SHAFT
AS
VIEWED
FROM
FRONT

PICKER ARM
SHR-0060-89
SHR_X1080A_89_CPG

Figure 5–4

Right and Left Shaft Locations

5–16 Problem Resolutions, Error Conditions, and Jam Recovery

Step 9: Remove the Magazine
Look down the rear side of the magazine from the top. If there is
no apparent obstruction, remove the magazine by lifting the handle.
Continue to step 18.
If the magazine does not remove easily, check once again for an
obstruction. If there is no apparent cause, some of the cartridges may
no longer be latched in the magazine, pushing against the inside of
the receiver window and increasing the force required to remove the
magazine.
Another cartridge may be in the machine; continue to step 18.
Step 10: Open the Receiver Door
A rectangular opening is in the sheet metal on the right side that exposes
two metal uprights (Figure 5–1). The rear one is fixed, but the front one
forms part of the receiver opening mechanism. Firmly squeezing these
two parts together opens the receiver door. If it opens, continue to step
11 If the receiver fails to open correctly, push it closed again, locate and
clear the jam before attempting to reopen the door. Possible situations to
note are:
•

Is the Mode Select key set to Service mode?

•

Did you turn the left shaft counterclockwise? (The left shaft is behind
the ‘‘toothed’’ rubber belt. Note that you cannot see into the machine,
but on the left side you can reach in through the opening.)

•

Is the magazine correctly seated?

Problem Resolutions, Error Conditions, and Jam Recovery 5–17

Step 11: Remove the Magazine
If the receiver door is open or can be fully opened and a magazine is
present, look down the rear side of the magazine from the top. If there is
no obstruction, remove the magazine by lifting the handle (Figure 5–5).
Continue to step 12 even if no magazine is present.
If the magazine does not remove easily, check once again for an
obstruction. If there is no apparent cause, cartridges may no longer
be latched in the magazine, pushing against the inside of the receiver
window and increasing the force required to remove the magazine.
Another cartridge may be in the machine. Continue to step 12.
Step 12: Push the Cartridge into the Drive
A cartridge may be jammed between the drive and the elevator. As this
cartridge could not be moved with the rollers, try to push it back into the
drive. Apply force to the front of the cartridge with a rod by reaching
through the receiver opening. If the cartridge does not move, leave it as
is. Even if the cartridge is not in its correct position, it may be possible to
open the loader transfer assembly. Continue to step 13.
Step 13: Unlatch the Loader Transfer Assembly
You can unlatch the loader transfer assembly by lifting the latch on the
right side (Figure 5–1). The loader transfer assembly can then be swung
to the left; be careful not to let it hit the left neighboring device if there is
one. You now have a clear view of the rear of the elevator and access to
the front panel of the tape drive. Continue to step 18.
Step 14: Remove the Magazine
If the receiver door is open or can be fully opened and a magazine is
present, look down the rear side of the magazine from the top. If there is
no obstruction, remove the magazine by lifting the handle (Figure 5–5).
Continue to step 15 whether or not a magazine is present.
If the magazine does not remove easily, check once again for an
obstruction. If there is no apparent cause, cartridges may no longer
be latched in the magazine, pushing against the inside of the receiver
window and increasing the force required to remove the magazine.
Another cartridge may be in the machine. Continue to step 15.

5–18 Problem Resolutions, Error Conditions, and Jam Recovery

Ejec

Loa

Slot

Pow

Wri

nloa

Sele

er O

te P

Tap

rote

e In

Driv

Loa

d/U

e Fa

d Fa

Use

ult

SHR-X0045-90

Figure 5–5

Removing Magazine

Problem Resolutions, Error Conditions, and Jam Recovery 5–19

Step 15: Unlock the TF837 Subsystem from the Storage Array
Unlock the TF837 subsystem from the storage array by setting the Mode
Select key to Service mode. Gently but firmly pull the subsystem out to
the first stop (32 cm or 12.5 inches) (Figure 5–2). Be careful not to use
excess force as it could disrupt the operation of other devices in the same
array. Continue to step 16.
Step 16: Check for a Jammed Cartridge
Look for a cartridge jammed inside. There are three places to look (you
may need to use a flashlight):
•

Through the receiver window; note the number of cartridges present.

•

Through the rectangular opening in the right side of the sheet metal.

•

From the top, look down through the gap where the loader transfer
assembly and rear chassis meet.
NOTE
Do not confuse an open drive handle with a cartridge.

A cartridge fully in the drive or fully on the elevator does not prevent the
loader transfer assembly from being opened. If this is the case or if there
is no cartridge, continue to step 17.
If a cartridge is partway between the elevator and the drive, try to move
the cartridge back onto the elevator by turning the gear wheel that drives
the cartridge rollers in a counterclockwise direction. Access to the rim
of this gear wheel is through the upper rectangular opening on the right
side, just underneath the connectors to the electronics module. If the
cartridge can be successfully moved fully onto the elevator, continue to
step 17.
If the cartridge does not move, try to push the cartridge back into drive.
Apply force to the front of the cartridge with a rod by reaching through
the receiver opening. If the cartridge does not move, leave it as is. Even
if the cartridge is not in its correct position, it may be possible to open the
loader transfer assembly. Continue to step 17.
Step 17: Unlatch the Loader Transfer Assembly
You can unlatch the loader transfer assembly by lifting the latch on the
right side (Figure 5–1). The loader transfer assembly can then be swung
to the left; be careful not to let it hit the left neighboring device if there is
one. You now have a clear view of the rear of the elevator and access to
the front panel of the tape drive. Continue to step 18.

5–20 Problem Resolutions, Error Conditions, and Jam Recovery

Step 18: Final Check
Even if no cartridges are left inside the loader, check for anything that
may be unusual. If the elevator is in the lowest position and it still has
a cartridge in it, lift it gently. You can remove the cartridge by pulling
it with your thumb and forefinger toward the back of the elevator. It is
acceptable for the elevator to slide back down again.
If a cartridge is in the tape drive, follow the instructions in the drive
documentation to retrieve the cartridge. This step will probably require
the power to be switched back on. This procedure is acceptable, as the
loader motors are shut off when the TF837 subsystem is pulled out of the
enclosure. However, the 5 volts supply is not shut off, so the TF837 OCP
indicators will be on.
Close the receiver. Gently close the loader transfer assembly, lifting the
latch on the right side at the same time. Remember, excess force could
disrupt the operation of other devices in the same storage array. Gently
but firmly slide the TF837 subsystem into the enclosure and lock it in
position with the Mode Select key.
After you have removed the jammed cartridge, be sure to inspect it for
damage, and the source of the jam.

6
Removal and Replacement
This chapter explains how to remove and replace the field replaceable
units (FRUs) in the TF837 magazine tape subsystem (Table 6–1 and
Figure 6–1). This chapter includes guidelines for performing the removal
and replacement procedures, instructions for manually unloading a
cartridge, and a table listing recommended spares, FRUs, and part
numbers.
Table 6–1 Field Replaceable Units
FRU

Reference Section

TFK70 DSSI controller module1

6.3.1

Loader transfer assembly

6.3.2

TK71 tape drive

6.3.3

TK71 tape drive takeup leader

6.3.4

Operator control panel (OCP)

6.3.5

12 Vdc fan

6.3.6

Interlock switch

6.3.7

Power supply assembly

6.3.8

Handle motor assembly

6.3.9

1 The instructions for removing and replacing this FRU include a warm swap procedure
(Section 6.3.1).

6–1

6–2 Removal and Replacement

LOADER TRANSFER ASSEMBLY
INTERLOCK
SWITCH

DSSI
CONTROLLER
MODULE

OPERATOR
CONTROL
PANEL
(OCP)

TK71
TAPE
DRIVE

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

SHR-X0147A-90-CPG

Figure 6–1

TF837 Magazine Tape Subsystem FRUs

Removal and Replacement 6–3

6.1 Recommended Spares
Table 6–2 lists the recommended spares, including subsystem FRUs, and
part numbers.
Table 6–2 Recommended Spares List
Description

Part Number

Tape drive
TFK70 DSSI controller module
Tape drive communications cable (26 pin)
Loader transfer assembly communications cable (10 pin)
Loader power harness
Internal DSSI communications cable (50 pin)

TK71–01
54–19085–01
29–28973–01
29–28972–01
29–28974–01
29–28975–01

Transfer assembly power cable (10 pin)
Transfer assembly OCP cable (16 pin)
Interlock switch cable (2 pin)
Transfer assembly keyswitch cable (3 pin)
Handle open sensor cable (3 pin)
External DSSI communications cable, 70 inch

29–28976–01
29–28977–01
29–28978–01
29–28979–01
29–28980–01
BC21R–5L

External DSSI communications cable, 42 inch
Takeup leader
Loader transfer assembly
Key lock assembly
Transfer assembly key (universal)
110 V power supply

BC21Q–3F
74–28268–01
29–28102–01
29–28981–01
29–28982–01
29–28102–01

220 V power supply
Operator control panel
Interlock switch
Handle motor assembly
Fan
Magazine

29–28103–01
29–28104–01
29–28105–01
29–28106–01
12–23373–13
30–32447–01

Head cleaning kit
Head cleaning refill kit
Antistatic kit

22–00436–01
22–00436–02
29–26246–00

6–4 Removal and Replacement

6.2 Removal and Replacement Guidelines
Follow these guidelines during a removal and replacement procedure:
•

Do not disconnect the external DSSI communications cable unless the
system is shut down. Doing so while the system is running can cause
a system failure and possibly cause the loss of customer data.

•

Save the hardware; the screws are of metric size and are not readily
available.

•

Use an antistatic kit where required in a procedure.

•

Use the power-on self-test (POST) procedure and local diagnostic
programs to diagnose most FRUs. (For nondiagnostic-detectable
failures, refer to the subsystem-specific and drive-specific problem
resolution sections in Chapter 5).

NOTE
Before you remove an FRU, be sure that:
•

A tape is not in the tape drive

•

You dismount the device by using a console command

6.3 FRU Removal and Replacement Procedures
This section describes how to remove and replace failing FRUs. TF837
FRUs can be removed without interrupting the host system or breaking
the DSSI bus. You can power down the subsystem and take it off-line
without interfering with the host or any other DSSI devices connected on
the DSSI bus.
CAUTIONS
Observe all ESD precautions while removing or replacing TF837
FRUs. An antistatic wrist strap is inside the front and rear doors
of the SF200 storage array.
To maintain stability, slide only one TF837 subsystem from its
enclosure at a time.
Do not try to pick up or support the TF837 subsystem by the rear
of the enclosure. Doing so can cause personal injury or damage to
the power supply.

Removal and Replacement 6–5

6.3.1 Removing and Replacing the TFK70 DSSI Controller
Module
Each controller module comes from the manufacturer with a unique device
name and system ID number. When you power up a TF837 subsystem
with a newly installed controller module, the new parameters transfer to
the host, and are added to the device list seen by the host. (The previous
parameters remain, although no physical device is present.) This list is
updated only during a reboot; therefore, you may see the ‘‘ghost name and
ID’’ of a controller module that you have removed. You can prevent this
by using the warm swap procedure.
6.3.1.1 Beginning the Warm Swap Procedure
This section describes how to remove and replace the TFK70 DSSI
controller module by using the warm swap procedure. The warm swap
procedure lets you remove and replace a TFK70 controller module while
the host system is operating. The procedure also lets you replace the
new controller module parameters with the original controller module
parameters, preventing multiple device names and images from being
listed.
Use this procedure when you are replacing a single TF837 subsystem.
CAUTION
Be sure not to disconnect the external DSSI communications cable
at the rear chassis; doing so can cause an error on the DSSI bus.
NOTE
You will need to refer to the current nodename during the warm
swap procedure. To list all nodenames, use the VMS command,
SHOW CLUSTER.
$ SHOW CLUSTER

The nodename and unit number may appear as either
T7SXJ9$MIA1 or TAPE1$MIA2.

6–6 Removal and Replacement

6.3.1.2 Collecting and Recording Original Controller Module Parameters
Before performing the warm swap procedure, you must collect and record
the original controller module parameters. In particular, you must note
the following information during the procedure:
•

Current nodename
This is the parameter known as NODENAME.

•

Unit number
This is the parameter known as UNITNUM.

•

System ID number
This is the parameter known as SYSTEMID.

There are three ways of obtaining these parameters:
1. Refer to the system site guide in which the parameters may have been
recorded during installation.
2. Use the ANALYZE/SYSTEM command to obtain information from
the system.
3. Use the SET HOST/DUP command to read the parameters from
EEPROM (if the controller module is accessible).
6.3.1.2.1 System Site Guide
Check the guide for the original UNITNUM, NODENAME, and
SYSTEMID.
6.3.1.2.2 ANALYZE/SYSTEM Command
At the DCL prompt ($), enter the following VMS command:
$ ANALYZE/SYSTEM

The system then displays the system analyzer prompt:
SDA>

At this prompt, enter the command:
SDA> SHOW DEVICE MI

to list the nodename, system ID number, and unit number.

Removal and Replacement 6–7

The following is an example output screen showing the nodename and
unit number:
VAX/VMS System Analyzer
SDA> SHO DEV MI
I/O data structures
------------------DDB list
-------Address
-------

Controller
----------

ACP
---

Driver
------

DPT
---

DPT size
--------

804D8230

TAPE1$MIA0

MTAACP

TUDRIVER

8030D330

4070

In the above example, the nodename is TAPE1; the unit number is the
final digit in the MIA0 portion of the nodename. In this case, the unit
number is 0.
The following example is an output screen showing the system ID
number:
--- TAPE1 System Block (SB) 804DB170 --System ID
3C3643CABC35
Max message size
64
Max datagram size
64
Local hardware type
TF70
Local hardware vers. 202020202020
303041202020

Local software type
TFXX
Local software vers.
T2.4
Local software incarn. 00010000
00010000
SCS poller timeout
001A
SCS poller enable mask
01

Press RETURN for more.

To exit the system analyzer, you must type the entire word EXIT at the
SDA> prompt. For example:
SDA> EXIT

If you found the correct information, proceed with the warm swap
procedure.

6–8 Removal and Replacement

6.3.1.2.3 SET HOST/DUP Command
NOTE
Before running the SET HOST/DUP command, be sure to load the
FYDRIVER local program by using this command:
$ MCR SYSGEN CONN FYA0/NOADAP

Use the SET HOST/DUP command to read the parameters from
EEPROM as well as access the PARAMS> prompt to set parameters.
The following is an example output screen showing the information
collected with the SET HOST/DUP command. Be sure to use the
parameters listed under Current.
$ SET HOST/DUP/SERVER=MSCP$DUP/TASK=PARAMS TAPE1
%HSCPAD-I-LOCPROGEXE, Local program executing - type ^\ to exit
Copyright © 1990 Digital Equipment Corporation
PARAMS> SHOW /ALL
Parameter
--------UNITNUM
FORCEUNI
NODENAME
FORCENAM
SYSTEMID

Current
------------0
0
TAPE1
0
3C3643CABC35

Default
-----------0
1
T7D0J9
0
3C3643CABC35

Type
-------Word
Boolean
String
Boolean
Quadword

Radix
----Dec
0/1
Ascii
0/1
Hex

NOTE
When using the SHOW /ALL command, be sure to leave a space
after the word SHOW. This command lists the current parameters.
To exit the PARAMS utility, type:
PARAMS> EXIT

Once you have found the parameters, proceed with the hardware removal
and replacement procedures. If you proceed without these parameters,
the operating system will continue to recognize the old controller module
parameters as well as the new ones until you reboot the system.

Removal and Replacement 6–9

6.3.1.3 Removing the TFK70 DSSI Controller Module
To remove the controller module:
1. Set the Mode Select key to Service mode (Figure 6–2).
2. Open the rear door of the SF200 storage array.
3. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
4. Set up an antistatic mat, and put on an antistatic wrist strap.
5. Release the one-quarter turn captive screws that secure the TFK70
DSSI controller module tray (Figure 6–3).
6. Release and slowly pull the tray approximately three-fourths from the
rear chassis. Proceed carefully as the tray can be removed fully from
the rear chassis.
NOTE
You may need to press the inside cable for it to clear the metal
edge.
7. Disconnect the large internal DSSI communications cable (J6) from
the controller module (Figure 6–4). This cable is dressed from the
controller module to the inside bulkhead of the rear chassis.
NOTE
This cable (J6) must be the first cable you disconnect from
the controller module and the last one you reconnect when
removing and replacing the TFK70 DSSI controller module.
8. Release the two front module clips in each corner (Figure 6–3).
9. Disconnect the loader transfer assembly communications cable (J2),
the power harness (J7), the tape drive communications cable (J1), and
remove the two rear module clips in each corner.
10. Remove the controller module and place it on the antistatic mat.
11. Note the DSSI node ID settings (Figure 6–4) on the faulty module.

6–10 Removal and Replacement

OPERAT OR CONTROL PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025B_89

Figure 6–2

Operator Control Panel

Removal and Replacement 6–11

TFK70 MODULE
TRAY

DSSI
BULKHEAD
CONNECTOR

TRAY
SCREWS

MODULE CLIPS

POWER SWITCH

SHR-0002-90
SHR-X0141A-90-CPG

Figure 6–3

TFK70 DSSI Bus Controller Module Tray

6–12 Removal and Replacement

GREEN

RED (LSB)
RED
RED
RED

LOADER
TRANSFER ASSEMBLY
COMMUNICATIONS
CONNECTOR

REMOTE
FRONT
PANEL
CONNECTOR
(NOT USED)

POWER
CONNECTOR

RED (MSB)
D1
NOT USED

J2
J7
E14

E46
J5

DSSI COMMUNICATIONS
CONNECTOR

TAPE DRIVE
COMMUNICATIONS
CONNECTOR

1
0
TAPE SERVER SW1

* SEE NOTE

NODE ID
SW2 SW3 SW4
2
1
0
2
2
2

* NOTE: Set to 1 to disable communications with TAPE SERVER.
Set to 0 to enable communications with TAPE SERVER.
SHR-X0055-90

Figure 6–4

TFK70 DSSI Bus Controller Module Block Diagram

Removal and Replacement 6–13

6.3.1.4 Replacing the TFK70 DSSI Controller Module
To install a new TFK70 controller module:
1. Set the DSSI node ID switches (Figure 6–4) so that they are identical
to the DSSI node ID switch settings on the faulty module.
2. Set TMSCP to disabled (SW0 = on position (1)).
3. Connect the loader transfer assembly communications cable (J2)
before setting the controller module onto the module tray.
4. Seat the new controller module onto the module clips at the front and
rear of the tray.
5. Reconnect the power harness (J7) and the tape drive communications
cable (J1) to the module.
6. Connect the internal DSSI communications cable (J6).
7. Slide the module tray back into the rear chassis. Do not lock the
tray as you will need to access the module again. Set the TF837
subsystem’s power switch to 1 (on). The POST sequence takes 15
seconds to complete.
CAUTION
Be careful not to damage cables or module components when
sliding the tray back into the rear chassis. If the tray does not
slide easily into the rear chassis, check the cable management
scheme.
Verification Procedure
Power up the TF837 subsystem.

6–14 Removal and Replacement

6.3.1.5 Restoring Parameters
Follow these steps to restore the parameters collected in Section 6.3.1.2:
1. Enter the SHOW CLUSTER command, which now lists a new
nodename. This command also verifies that the controller module
is functioning correctly.
2. Enter the SET HOST/DUP command to invoke the PARAMS>
prompt. For example:
$ SET HOST/DUP/SERVER=DUP/TASK=PARAMS T7F0J9

The new nodename of the replacement module in this example is
T7F0J9.
3. Set the new parameters to those of the original controller module. For
example:
•

Set the nodename.
PARAMS> SET NODENAME TAPE01

•

Set the unit number.
PARAMS> SET UNITNUM 0

•

Set the force unit number.
PARAMS> SET FORCEUNI 0

•

Set the force nodename.
PARAMS> SET FORCENAM 0

•

Set the system ID number.
PARAMS> SET SYSID 3C3643CABC35

NOTE
You must enter the system ID number accurately; otherwise, a
reboot of the system will be necessary to recover.

Removal and Replacement 6–15

4. Enter the SHOW /ALL command to confirm the resetting of
parameters:
PARAMS> SHOW /ALL

5. Enter the WRITE command to complete the procedure. This step
saves the new parameters in nonvolatile memory.
PARAMS> WRITE

The system prompts:
Changes require controller initialization, ok? [Y/(N)] Y

To save changes made using PARAMS, you must answer YES. When
you answer YES to the controller initialization prompt, your changes
take effect immediately and program control returns to the DCL
command prompt.
6.3.1.6 Completing the Warm Swap Procedure
To complete the warm swap procedure:
1. Set the TF837 subsystem’s power switch to 0 (off).
2. Slide the TFK70 DSSI controller module tray out of the rear chassis.
3. Set TMSCP to enabled (SW0 = off position (0)).
4. Secure the module tray and the SF200 rear door.
5. Set the TF837 subsystem’s power switch to 1 (on).
6. Enter the SHOW DEVICE command to display the original name of
the replaced controller module.
NOTE
The TF837 subsystem may take several minutes to appear on-line.

6–16 Removal and Replacement

6.3.2 Removing and Replacing the Loader Transfer
Assembly
Use the following steps to remove and replace the loader transfer
assembly. The loader transfer assembly contains the electronics module,
receiver, OCP, elevator, and associated motor drive trains.
Removal Procedure
1. Verify with the operator or system manager that the TF837 magazine
tape subsystem is dismounted.
2. Verify that you have the following service aids: antistatic kit (PN
29–26246–00) and a scratch tape.
3. Set the Mode Select key to Service mode (Figure 6–2). Press the Eject
button to unload any cartridge and open the receiver door.
NOTE
Do not open the front door of the SF200 storage array. It
will hinder removal and replacement of the loader transfer
assembly.
4. If the receiver does not open, follow these steps:
a. Access the rear of the TF837 subsystem.
b. Push the TF837 subsystem forward to the first mechanical stop
(Figure 6–5).
c.

Squeeze the mechanical ejection lever to open the receiver
(Figure 6–6).

With the receiver open, grasp under the top of the front bezel and
slide the subsystem to the first mechanical stop (Figure 6–5).
5. Remove the magazine (with customer cartridges) from the receiver.
6. Close the receiver.

Removal and Replacement 6–17

FIRST
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106B_89

Figure 6–5

Sliding the TF837 Subsystem to the First Mechanical Stop

6–18 Removal and Replacement

FIRST
MECHANICAL
STOP

SECOND
MECHANICAL
STOP

MECHANICAL
EJECTION LEVER

SHR-0012-90
SHR-X0147C-90-CPG

Figure 6–6

Mechanical Ejection Lever

Removal and Replacement 6–19

7. Lift the latch (Figure 6–7) and swing open the loader transfer
assembly.
8. If the cartridge did not unload from the tape drive, see section
Section 6.4, Manually Removing a Cartridge from the Drive.
9. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
10. Set up an antistatic mat, and put on an antistatic wrist strap.
11. Open the cable clamps on the left side of the subsystem assembly
(Figure 6–8).
12. Disconnect the two loader transfer assembly interface cables that plug
into the electronics module (Figure 6–8).
13. Disconnect the ground strap on the left side of the loader transfer
assembly (Figure 6–8).
14. Push down on the hinge locking lever (Figure 6–8).
15. Lift the open loader transfer assembly off the two hinge pins. The
loader transfer assembly must be completely open.
16. Place the loader transfer assembly on the antistatic mat.
17. Note the number on the DSSI node ID label (Figure 6–2).
18. Package the loader transfer assembly (for return to the repair depot)
in the box that contained the new loader transfer assembly.

6–20 Removal and Replacement

LOADER TRANSFER ASSEMBLY
INTERLOCK
SWITCH

DSSI
CONTROLLER
MODULE

RIGHT
CAPTIVE
SCREWS

LATCH
OPERATOR
CONTROL
PANEL
(OCP)

TK71
TAPE
DRIVE

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

HOME POSITION
OF ELEVATOR
SHR-X0147F-90-CPG

Figure 6–7

Loader Transfer Assembly Latch Position

Removal and Replacement 6–21

HINGE LOCKING LEVER

INTERFACE
CABLES

LEFT
CAPTIVE
SCREWS

GROUND
STRAP

CABLE CLAMPS

MODE
SELECT KEY

SHR-X0143-90-CPG

Figure 6–8

Left Side View of Magazine Tape Subsystem

6–22 Removal and Replacement

Replacement Procedure
1. Install the new loader transfer assembly on the rear chassis hinge
pins. Transfer assembly must be completely open.
2. Push the bottom part of the hinge locking lever to clamp the top hinge
pin.
3. Reconnect the ground strap.
4. Reconnect the loader transfer assembly interface cables to the
electronics module. Secure the cable clamps.
5. Swing the loader transfer assembly closed. Observe that the loader
transfer assembly latch is closed.
6. Push the TF837 subsystem into the enclosure.
7. Set the Mode Select key to Service mode (Figure 6–2).
8. Fill out and install a new unit ID label. The label should contain the
same information as the label on the faulty unit. (Labels are provided
in a label booklet stored inside the front door of the SF200 storage
array.)
9. Secure the rear door of the SF200 storage array.

Removal and Replacement 6–23

Verification Procedure
1. Set the TF837 subsystem’s power switch to 1 (on). Observe that all
indicators on the OCP light. (If the Power On indicator is not on, it is
likely that you have not fully pushed the subsystem into the enclosure
(thereby enabling the 24 Vdc interlock switch).
2. After 15 seconds, POST should have executed successfully. Except for
the Loader Fault indicator, all indicators should remain on until the
host system initializes the TF837 subsystem.
3. Press the Eject button to open the receiver.
4. At the front of a spare magazine (Figure 6–9), insert a scratch tape
into slot 0. Be sure the cartridge is write-enabled.
5. Insert the magazine into the receiver (Figure 6–10).
6. Close the receiver. Wait 15 seconds for the elevator to scan the
magazine.
7. Press the Load/Unload button to verify a successful load operation.
After the cartridge loads to the drive, observe that the Load/Unload
and Tape In Use indicators light.
8. To unload the cartridge, press the Load/Unload button again. After
the cartridge unloads, observe that the Load/Unload, Eject, and Slot
Select indicators light.
9. Press the Eject button to remove the magazine from the receiver.
10. Close the receiver and return the subsystem to the customer.
For more detailed verification, see Section 4.6.

6–24 Removal and Replacement

SHR_X1023A_89

Figure 6–9

Front of Magazine Showing Cartridge Slots

Removal and Replacement 6–25

FRONT
BEZEL

Ejec

Loa

Slot

Pow

Wri

d/U

nloa

Sele

er O

te P

Tap

Driv

Loa

rote

e In

Use
Cle
anin

Use

g Ta

e Fa

d Fa

ult

SHR-X0046-90

Figure 6–10

Open Receiver

6–26 Removal and Replacement

6.3.3 Removing and Replacing the TK71 Tape Drive
Refer to the following steps to remove and replace a failing TK71 tape
drive:
Removal Procedure
1. Verify with the operator or system manager that the TF837 magazine
tape subsystem is dismounted.
2. Verify that you have the following service aids: antistatic kit (PN
29–26246–00) and a scratch tape.
3. Set the Mode Select key to Service mode (Figure 6–2). Press the Eject
button to unload any cartridge and open the receiver door. Refer to
step 7 if the receiver fails to open.
4. Open the rear door of the SF200 storage array.
5. Release the one-quarter turn captive screws that secure the TFK70
module tray (Figure 6–3).
6. Release and slowly pull the tray approximately three-fourths from the
rear chassis. Proceed carefully as the tray can be removed fully from
the rear chassis.
NOTE
You may need to press the inside cable for it to clear the metal
edge.
7. If the receiver does not open, follow these steps:
a. Access the rear of the TF837 subsystem.
b. Push the TF837 subsystem forward to the first mechanical stop
(Figure 6–5).
c.

Squeeze the mechanical ejection lever to open the receiver
(Figure 6–6).

With the receiver open, grasp under the top of the front bezel and
slide the subsystem to the first mechanical stop (Figure 6–5).
8. Remove the magazine (with customer cartridges) from the receiver.
9. Close the receiver.

Removal and Replacement 6–27

10. Lift the latch (Figure 6–7) and swing open the loader transfer
assembly.
11. If the cartridge did not unload from the tape drive, see section
Section 6.4, Manually Removing a Cartridge from the Drive.
12. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
13. Set up an antistatic mat, and put on an antistatic wrist strap.
14. Use a screwdriver to press the first mechanical stop; slide the
subsystem to the second mechanical stop (Figure 6–11).
15. Use a screwdriver to disengage the four captive screws that secure the
drive at the right (Figure 6–7) and left (Figure 6–8) sides of the rear
chassis. Each screw is recessed inside a nut. Do not attempt to loosen
these nuts.
16. Push or pull the plastic tab on the handle motor assembly about one
inch to the right (Figure 6–12). (You may have to move the drive
slightly to release the plastic tab.)
17. Rotate the black plastic tab toward the handle motor assembly.
18. Slide the drive toward you almost fully out of the rear chassis.
19. Disconnect the 4-pin power supply cable the communications cable
from the rear of the drive (Figure 6–13).

6–28 Removal and Replacement

SECOND
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106C_89

Figure 6–11
Stop

Sliding the TF837 Subsystem to the Second Mechanical

Removal and Replacement 6–29

3 SCREWS

PLASTIC TAB
SHR-0012-90
SHR-X0147B-90-CPG

Figure 6–12

TF837 Magazine Tape Subsystem Plastic Tab

6–30 Removal and Replacement

Replacement Procedure
1. Insert the TK71 tape drive halfway into the rear chassis.
2. Connect the power supply and communications cables to the rear of
the replacement TK71 tape drive (Figure 6–13).

REAR CHASSIS

BACK O F T K71

POWER SUPPLY
CABLE

COMMUNICATIONS
CABLE

SHR-X0013-91

Figure 6–13

Cabling at Rear of Drive

Removal and Replacement 6–31

3. Slide the drive into the rear chassis; align the drive handle shaft
with the handle motor coupling shaft (Figure 6–14). You can see the
drive handle shaft by looking down on the drive from the top. A halfmoon cutout in the drive bezel accommodates the shaft and coupling
assembly.
CAUTION
Carefully position cables when sliding the drive into the
chassis to ensure no damage occurs from snagging.

DRIVE
HANDLE
SHAFT

HANDLE
MOTOR
COUPLING
SHAFT
SENSOR
ASSEMBLY
PLASTIC TAB

PIVOT
GEAR
PINION
GEAR

STOPPER
SHR-0067-89
SHR-X0146-90-CPG

Figure 6–14

Handle Motor Assembly

6–32 Removal and Replacement

4. Engage the drive shaft with the handle motor coupling shaft.
a. Push the handle motor coupling shaft toward the drive; it will
partially slip onto the handle shaft. Place the black plastic tab
that was rotated into a horizontal position. Position the pivot
gear of the handle coupling shaft so that the top flat edge is
perpendicular to the floor of the unit.
b. Locate the white plastic tab (interposer) on the drive. This tab
along with a small metal tab (write-protect switch) is inside the
cartridge opening adjacent to the Tape In Use indicator on the
bezel. This assembly locks the drive handle and must be pushed
to the right to lift the handle.
CAUTION
Failure to release the interposer before lifting the handle
could cause damage; do not force the handle against the
locking mechanism.
c.

With the handle now lifted to the open position, apply pressure
to the handle coupling shaft and slowly rotate the drive handle
downward. It may be necessary to wiggle the drive slightly to
firmly seat the shaft.

d. Engage all four mounting screws of the chassis to the drive but
ensure that the right rear screw is tightened last.
CAUTION
If the handle motor coupling shaft is seated correctly, the
loader transfer assembly can be closed and latched without
difficulty. Use caution in closing the transfer assembly
and push the black plastic tab farther toward the drive, if
necessary, to seat it fully. Be careful not to damage the heads
on the drive mounting screws.

Removal and Replacement 6–33

5. Slide the TF837 subsystem fully into the enclosure.
CAUTION
Carefully guide the cables while sliding the tray in or out.
Because the cables are loose, they could interfere with the
handle down optic sensor.
6. Tighten the one-quarter turn captive screws that secure the TFK70
DSSI controller module tray (Figure 6–3).
7. Redress the external DSSI communications cables into the rear
chassis’ cable restraints.
8. Redress the subsystem’s ac power cable into the cable restraints.
9. Verify a secure power connection at both ends of the power cable.
Verification Procedure
1. Set the TF837 subsystem’s power switch to 1 (on). If the Power On
indicator does not light, verify that the subsystem is placed as far into
the enclosure as possible.
2. Press the Eject button and remove the customer’s magazine (if you
have not already done so).
3. Install a scratch tape in slot 0 at the front of a spare magazine
(PN 30–32447–01). Be sure that the cartridge’s write-protect tab is
adjacent to the slot number on the front of the magazine (Figure 6–9).
4. Install the magazine into the receiver.
5. Execute either the DRVTST or DRVEXR test.
6. Secure the rear door of the SF200 storage array.

6–34 Removal and Replacement

6.3.4 Removing and Replacing the TK71 Tape Drive Takeup
Leader
The following procedure explains how to remove a damaged takeup leader
from the TK71 tape drive and replace it with a new one:
1. Perform the drive removal procedure as described in Section 6.3.3 to
access the drive.
2. Remove the cover from the drive to access the takeup reel. Note
where each screw was located and which screws have washers.
3. Pull the leader out of its tape path, removing the mushroom-shaped
end from the drive. The square end of the leader is still connected to
the takeup reel (Figure 6–15).
4. Disengage the square end of the leader from the small latch hook that
fits through the hole in the end of the leader.
5. Insert the square end of the new leader through the small slot in the
takeup reel. Hook the hole in the leader through the small latch hook
in the takeup reel slot.
6. Begin to feed the mushroom-shaped end of the leader through the
tape path after you attach the square end to the slot in the takeup
reel.
7. Thread the tape through the tape path as follows:
Feed the mushroom-shaped end behind the capstan closest to the
takeup reel (rear capstan), in front of the plastic guide, in front of the
read/write head, behind the second capstan (front capstan), in front of
its plastic guide, and into the drive’s receiver assembly (Figure 6–16).
8. Reach through the hole in the top of the receiver assembly and latch
the hole in the mushroom-shaped end of the leader around the hook
on the latch mechanism inside the receiver assembly. When you are
finished, look into the drive from the front and make sure the leader
is correctly aligned.
9. Replace the cover with the front of the drive facing you. Install the
screws in the following sequence: right rear, left front, and left rear.
Torque the screws to 13 inch-pounds.

Removal and Replacement 6–35

FRONT
CAPSTAN
PLASTIC
GUIDE
READ/WRITE
HEAD

REAR
CAPSTAN

PLASTIC
GUIDE

PLASTIC
LEADER

LATCH HOOK
FOR LEADER

SQUARE END
OF LEADER

MUSHROOM END
OF LEADER

SHR-0228-86
SHR_X1088_89_CPG

Figure 6–15
Tape Path)

Replacing the Takeup Leader (Leader Removed from the

6–36 Removal and Replacement

TAKEUP LEADER
FRONT
CAPSTAN
PLASTIC
GUIDE

READ/WRITE
HEAD
REAR
CAPSTAN
PLASTIC
GUIDE

PLASTIC
TAKEUP
LEADER
LATCH HOOK
FOR LEADER

SQUARE END
LEADER

SHR-0227-86
SHR_X1091_89_CPG

Figure 6–16

TK71 Tape Path (Takeup Leader Replaced)

Removal and Replacement 6–37

6.3.5 Removing and Replacing the Operator Control Panel
Refer to the following steps to remove and replace the operator control
panel (OCP).
Removal Procedure
1. Verify with the operator or system manager that the TF837 magazine
tape subsystem has been dismounted.
2. Set the Mode Select key to Service mode (Figure 6–2).
3. Press the Eject button. In the receiver opening, grasp under the front
bezel and slide the subsystem to its first mechanical stop (Figure 6–5).
NOTE
Access the rear of the TF837 subsystem, if the Eject button
fails to function, and push the subsystem to the first
mechanical stop.
4. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
5. Set up an antistatic mat, and put on an antistatic wrist strap.
6. Remove the three screws (Figure 6–17) that secure the control panel
assembly to the loader transfer assembly. (Be careful not to misplace
the screws as they are metric and not easily obtainable.)
7. Disconnect the OCP cable from the OCP.
8. Remove the OCP.
Replacement Procedure
Reverse the preceding steps to replace the operator control panel.
Verification Procedure
Execute the POST procedure. Except for the Loader Fault indicator, all
OCP indicators should remain on until the host system initializes the tape
subsystem.

6–38 Removal and Replacement

3 SCREWS

PLASTIC TAB
SHR-0012-90
SHR-X0147B-90-CPG

Figure 6–17

Removing the OCP

Removal and Replacement 6–39

6.3.6 Removing and Replacing the 12 Vdc Fan
Refer to the following steps to remove and replace the 12 Vdc fan:
Removal Procedure
1. Access the rear of the TF837 magazine tape subsystem.
2. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
3. Remove the two screws that secure the fan. Remove and set aside the
fan’s grill. (Be careful not to misplace the screws as they are metric
and not easily obtainable.)
4. Note the orientation, for reinstallation purposes, of the fan’s power
wires and disconnect them.
5. Remove the fan.
Replacement Procedure
Reverse the preceding steps to replace the fan. To ensure correct airflow,
be sure to reconnect the fan’s power wires in their original orientation.
Verification Procedure
1. Set the TF837 subsystem’s power switch to 1 (on).
2. Observe counterclockwise rotation of the fan.
3. Secure the rear door of the SF200 storage array.

6–40 Removal and Replacement

6.3.7 Removing and Replacing the Interlock Switch
Refer to the following steps to remove and replace the interlock switch
(Figure 6–18):
Removal Procedure
1. Verify with the operator or system manager that the TF837 magazine
tape subsystem is dismounted.
2. Set the Mode Select key to Service mode (Figure 6–2).
3. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
4. Set up an antistatic mat, and put on an antistatic wrist strap.
5. Disconnect the TF837 subsystem’s power supply cable.
6. Release the one-quarter turn captive screws that secure the TFK70
DSSI controller module tray (Figure 6–3).
7. Pull the tray several inches out of the rear chassis.
8. Disconnect the internal DSSI communications cable (J7) from the
TFK70 DSSI controller module (Figure 6–4).
CAUTION
Do not disconnect the external DSSI communications cable
(Figure 6–3) from the bulkhead connector. Doing so can cause
system failure and possible loss of customer data.
9. Remove the screws that secure the DSSI bulkhead connector. (Be
careful not to misplace the screws as they are metric and not easily
obtainable.)
10. Remove the internal DSSI communications cable through the rear of
the module tray.
11. Push the tray back into the rear chassis. Secure the one-quarter turn
captive screws.
CAUTION
Be careful not to damage cabling or module components when
performing this step. Check the cable management scheme.

Removal and Replacement 6–41

INTERLOCK SWITCH

SHR-0009-90
SHR-X0143A-90-CPG

Figure 6–18

Interlock Switch

6–42 Removal and Replacement

12. Push the TF837 subsystem forward to its first mechanical stop
(Figure 6–5).
13. Use a screwdriver to press the first mechanical stop; slide the
subsystem forward to its second mechanical stop (Figure 6–11).
WARNING
Be careful when performing the next several steps; the TF837
subsystem is heavy.
14. Press the second mechanical stop; slide the TF837 subsystem just
beyond the second mechanical stop.
15. Hold the subsystem under the front bezel and rear chassis. Carefully
slide the subsystem fully out of the enclosure.
16. Place the subsystem on the antistatic mat.
17. Release the one-quarter captive screws that secure the TFK70 module
tray (Figure 6–3).
18. Slide the tray fully out of the rear chassis.
19. Note the color scheme of the two interlock switch cable connections.
Remove the cables.
20. Remove the two screws that secure the interlock switch. While
performing this step, place a hand under the switch to catch both
the switch and mounting hardware.
21. Remove the interlock switch.
Replacement Procedure
Reverse the preceding steps to replace the interlock switch.
CAUTION
When sliding the TFK70 module tray back into the enclosure, pull
the power cable (J7) taut to avoid snagging it behind the rail that
supports the tray.

Removal and Replacement 6–43

6.3.8 Removing and Replacing the Power Supply Assembly
Refer to the following steps to remove and replace the power supply
assembly:
Removal Procedure
1. Verify with the operator or system manager that the TF837 magazine
tape subsystem is dismounted.
2. Set the Mode Select key to Service mode (Figure 6–2).
3. Open the rear door of the SF200 storage array.
4. Set the TF837 subsystem’s power switch to 0 (off) (Figure 6–3).
5. Set up an antistatic mat, and put on an antistatic wrist strap.
6. Disconnect the power plug from the rear of the TF837 subsystem.
7. Push the TF837 subsystem forward to its first mechanical stop
(Figure 6–5).
8. Lift the latch (Figure 6–7) and swing open the loader transfer
assembly.
9. Loosen the captive screws securing the lower intermediate bezel
(Figure 6–19) and remove the bezel.
10. Disconnect the cable connections at the front of the power supply
assembly (Figure 6–20) (except for the cable harness X1, second from
the left).
11. Move the cables into the sheet metal cutouts (Figure 6–20).
12. Grasp the top cover of the power supply assembly and lift up the
assembly.
13. Slide the assembly toward you to remove it. While performing this
step, ensure that the cables are not pinched.

6–44 Removal and Replacement

SHR-X0147D-90-CPG

Figure 6–19

Removing the Intermediate Bezel

Removal and Replacement 6–45

SHR-0013-90
SHR-X0142-90-CPG

Figure 6–20

Power Supply Assembly

6–46 Removal and Replacement

Replacement Procedure
Reverse the preceding steps to replace the power supply assembly.
Verification Procedure
1. Set the TF837 subsystem’s power switch to 1 (on).
NOTE
If the Power On indicator fails to light, you may not have
pushed the subsystem fully into the enclosure to activate the
24 Vdc interlock switch. You can also verify the interlock
switch by checking its circuitry with an ohm meter. Check X3
on the power supply assembly; a good interlock switch circuit
reads 0 ohm.
2. Press the Load/Unload button to return the cartridge to the magazine
if a cartridge is in the drive.

Removal and Replacement 6–47

6.3.9 Removing and Replacing the Handle Motor Assembly
Refer to the following steps to remove and replace the handle motor
assembly:
Removal Procedure
1. Verify with the operator or system manager that the TF837 magazine
tape subsystem is dismounted.
2. Set the Mode Select key to Service mode (Figure 6–2). Press the Eject
button to unload any cartridge and open the receiver door.
3. If the receiver does not open, follow these steps:
a. Access the rear of the TF837 subsystem.
b. Push the TF837 subsystem forward to the first mechanical stop
(Figure 6–5).
c.

Squeeze the mechanical ejection lever to open the receiver
(Figure 6–6).

With the receiver open, grasp under the top of the front bezel and
slide the subsystem to the first mechanical stop (Figure 6–5).
4. Remove the magazine (with customer cartridges) from the receiver.
5. Close the receiver.
6. Lift the latch (Figure 6–7) and swing open the loader transfer
assembly.
7. If the cartridge did not unload from the tape drive, see section
Section 6.4, Manually Removing a Cartridge from the Drive.
8. Set the TF837 subsystem’s power switch to 0 (off). (Figure 6–3).
9. Set up an antistatic mat, and put on an antistatic wrist strap.
10. Open the rear door of the SF200 storage array.
11. Release the one-quarter turn captive screws that secure the TFK70
DSSI controller module tray (Figure 6–3).
12. Release and slowly pull the tray approximately three-fourths from the
rear chassis. Proceed carefully as the tray can be removed fully from
the rear chassis.
NOTE
You may need to press the inside cable for it to clear the metal
edge.

6–48 Removal and Replacement

13. From the front, use a screwdriver to press the first mechanical
stop. Slide the TF837 subsystem to its second mechanical stop
(Figure 6–11).
14. Release the captive screws that secure the lower intermediate bezel
(Figure 6–19). Remove the bezel.
15. At the two rightmost cable connections on the power supply assembly,
disconnect the handle motor assembly wiring (Figure 6–20) on right
exterior of the loader transfer assembly.
16. Release the cable clamp that secures the motor assembly wiring.
17. Slide the plastic tab to the right (Figure 6–21).
18. Disconnect the wire harness to the door open sensor assembly on the
right interior of the rear chassis.
19. Remove the three screws (Figure 6–21) that secure the handle motor
assembly to the side of the rear chassis. (Be careful not to misplace
the screws as they are metric and not easily obtainable.)
NOTE
You do not have to remove the screws that secure either the
door open sensor assembly or the coupling shaft. The sensor
and coupling shaft are part of the larger FRU.
20. Slide the wire harness through the cutout in the rear chassis.
21. Move the handle motor assembly toward the rear of the subsystem to
free the coupling shaft.
22. Remove the handle motor assembly from the cutout.

Removal and Replacement 6–49

DRIVE
HANDLE
SHAFT

HANDLE
MOTOR
COUPLING
SHAFT
SENSOR
ASSEMBLY
PLASTIC TAB

PIVOT
GEAR
PINION
GEAR

STOPPER
SHR-0067-89
SHR-X0146-90-CPG

Figure 6–21

Handle Motor Assembly

6–50 Removal and Replacement

Replacement Procedure
NOTE
Before replacing the handle motor assembly, be sure that the
sensor assembly arm rests on the plastic stopper of the pivot gear
(Figure 6–21). You may have to maneuver the gears slightly to seat
the sensor assembly arm correctly.
1. Align the three corner screws over the mounting holes; insert the
handle motor assembly back into the side of the rear chassis.
2. Be sure to seat the handle motor coupling shaft fully. You may have
to move the pivot gear slightly; if so, be sure that the sensor assembly
arm remains on the plastic stopper.
NOTE
If the handle motor coupling shaft is not seated correctly, the
subsystem will not close.
3. Carefully place the connector wires inside the cable clamp; thread the
connectors through the metal cutout.
NOTE
Be sure the connector wires are not tangled to ensure that the
subsystem does not jam when you push it into the enclosure.
4. Align and connect the connector wires to the power distribution panel.
5. Replace the intermediate bezel, and fasten the captive screws.
6. Close the TF837 subsystem.

Removal and Replacement 6–51

6.4 Manually Removing a Cartridge from the Drive
If a cartridge does not unload from the TK71 tape drive when you press
the Eject button on the TF837 OCP, you can remove the cartridge
manually by first pressing the Unload button on the drive. If this step
fails, manually rewind the tape to unload the cartridge (Figure 6–22).
To manually rewind the tape, refer to the following procedure (this
procedure assumes that you have already removed the drive from its
enclosure):
1. Turn the drive on its side; note the hole in the circuit board toward
the front of the drive.
CAUTION
Do not turn the drive upside down or the tape will fall off the
takeup reel.
2. Turn the screw inside the hole counterclockwise, using a Phillips
screwdriver.
3. Rewind the tape until it unloads into the cartridge.
4. Pull the solenoid out and lift the handle to eject the cartridge
(Figure 6–22).
Return the cartridge to its original storage position in the magazine. (You
can determine the original position by looking at the front of the magazine
(Figure 6–9).) The first empty slot that has a metal flag showing is the
slot from which the cartridge should have originated. Insert the cartridge
from the rear of the magazine. Be sure the write-protect tab is adjacent
to the slot number on the front of the magazine to ensure that its position
is the same as those of the other cartridges.
NOTE
Be sure to check the cartridge for any damage that may have
occurred.

6–52 Removal and Replacement

SHR-0229-86
SHR_X1089_89_CPG

Figure 6–22

Manually Rewinding Tape in a TK71 Tape Drive

A
Head Cleaning
This appendix describes how to clean the read/write head of the TK71
tape drive in the TF837 magazine tape subsystem. To perform the
procedures, make sure you have a head cleaning kit (PN 22–00436–01).
The head cleaning kit contains the following items:
•

Positioning Cartridge — Directs the wand over the head.

•

Wand — Carries the cleaning fluid.

•

Capsule — Contains a single-dose cleaning fluid applicator.

NOTE
The wand and capsules are disposable.

A–1

A–2 Head Cleaning

A.1 Tape Drive Access
To gain access to the drive to clean the read/write head, perform the
following procedure:
1. Ensure that the TF837 subsystem operations are complete.
2. Ensure that the Eject indicator is on.
3. Open the SF200 storage array.
4. Set the Mode Select key to Service mode (Figure A–1).
5. Press the Eject button (Figure A–1).
6. Pull the TF837 subsystem toward you by placing your hand under the
top of the TF837 front bezel (Figure A–2).
CAUTION
An internal service stop should prevent you from from pulling
the TF837 subsystem more than several inches forward. The
Power On indicator should turn off at this time. If, after you
pull the subsystem forward, the Power On indicator does not
turn off, do not attempt the head cleaning procedure.
7. Lift the subsystem (loader) open latch (Figure A–3) (to the right of the
unit).
8. Swing the front of the TF837 subsystem to the left. Be careful not to
hit the storage array with the front of the subsystem.
You now have access to the TK71 drive’s cartridge entrance (Figure A–4).

Head Cleaning A–3

OPERAT OR CONTROL PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025B_89

Figure A–1

Operator Control Panel

A–4 Head Cleaning

FIRST
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106B_89

Figure A–2

Sliding the TF837 Magazine Tape Subsystem Toward You

Head Cleaning A–5

LOADER OPEN LATCH

SHR-0007-90
SHR-X0140-90-CPG

Figure A–3

Using the Loader Open Latch

A–6 Head Cleaning

CARTRIDGE INSERT/RELEASE HANDLE
SHR-X0056A-90

Figure A–4

TK71 Tape Drive

Head Cleaning A–7

A.1.1 Cleaning the Read/Write Heads
To clean the read/write heads in the TK71 tape drive, perform the
following procedure:
1. Insert the positioning cartridge into the drive (Figure A–5).
CAUTION
You do not have to lift the drive’s insert/release handle to
insert the positioning cartridge.
2. Hold the solvent applicator with the bristle end down. Pinch the
applicator at the dot, and crush it to release fluid and saturate the
bristles.
3. Apply solvent to the fabric side of the wand. Cover about 5 cm (2 in)
of the wand tip.
4. Insert the wand into the slot, with the fabric side of the wand facing
the square on the positioning cartridge, until the wand tab touches
the front surface of the drive (Figure A–5).
5. Move the wand in and out 10 times, about 2.5 cm to 5 cm (1 in to 2
in) each way.
NOTE
If the TK71 drive indicators begin to flash while you are
cleaning, press the drive’s Unload button to reset the drive.
6. Discard the wand and solvent applicator. They are designed for single
use only.

A–8 Head Cleaning

SHR-0064-89
SHR_X1090_89_CPG

Figure A–5
Drive

Inserting the Positioning Cartridge into the TK71 Tape

Head Cleaning A–9

A.1.2 Securing the TF837 Subsystem
After cleaning the heads, secure the TF837 subsystem as follows:
1. Note that the drive’s cartridge insert/release handle is lowered.
2. Close the front of the subsystem.
3. Press down on the latch to secure the TF837 loader (Figure A–3).
4. Push the TF837 subsystem back into the SF200 storage array.
5. Be sure that the Power On indicator is on.

B
Error Logs
This appendix describes the error logs created by the VMS operating
system as it monitors operation of the TF837 magazine tape subsystem.
Information on accessing error logs is available in the VAX/VMS Error
Log Utility Reference Manual. As of this printing, VMS error logs contain
the following TF837 subsystem information:
•

Unit number

•

Firmware revision

•

Hardware revision

•

Fault code

To obtain a VMS error log printout, use the ANALYZE/ERROR_LOG
command. For example:
$ ANALYZE/ERROR_LOG/INCLUDE=MIXX

where XX is a DSSI bus identifier and TMSCP number.
Subsystem faults are returned to an error log. The faults are logged to
the tape drive (model byte = decimal). To find a subsystem error among
drive errors, look for the entry Media Subsystem Error.
For a detailed description of error logging related to the TF837 subsystem,
refer to Chapter 4.

B–1

B–2 Error Logs

B.1 Device-Dependent Error Codes
The following are device-dependent error codes for the TF837 subsystem:
CODE
----

DESCRIPTION
-----------

80H
81H
82H
83H
84H
85H
86H
87H
88H
89H
8AH
8BH
8CH
8DH
8EH
8FH
90H
91H
92H
93H
94H
95H
96H
97H
98H
99H
9AH
9BH
9CH
9DH
9EH
9FH
A0H
A1H
A2H
A3H
A4H
A5H
A6H
A7H
A8H
A9H
AAH
ABH
ACH
ADH
AEH
AFH

No error
Unrecognized subsystem command
Undefined error
Undefined error
Cartridge slot number unknown
Lost picker homeposition
Lost PICKPOS1
Timeout moving cartridge to elevator
Lost DRIVEPOS
Lost elevator homeposition
Stuck at DRIVEPOS
Error during picker test
Timeout picker to PICKPOS1
Timeout picker to homeposition
Timeout picker to PICKPOS2
Undefined error
No cartridge in drive
Lost PICKPOS2
Timeout opening drive handle
Timeout finding picker homeposition
Timeout moving cartridge from drive
Timeout elevator to slot position
Timeout finding PICKPOS1
Timeout cartridge to slot
Timeout finding picker homeposition
Timeout elevator to DRIVEPOS
Timeout finding PICKPOS2
Cannot open receiver
Failed to find all slots
Timeout leaving cartridge type window
Timeout leaving DRIVEPOS
Undefined error
Cartridge already in drive
No cartridge in selected slot
Timeout elevator to slot position
Timeout finding PICKPOS1
Timeout cartridge slot to elevator
Timeout finding picker homeposition
Timeout elevator to drive
Timeout opening drive handle
Timeout cartridge to drive
Timeout finding PICKPOS2
Reserved
Timeout prepositioning elevator
Timeout closing drive handle
Failed to find all slots
Timeout cartridge to slot
Undefined error

Error Logs B–3

CODE
----

DESCRIPTION
-----------

B0H
B1H
B2H
B3H
B4H
B5H
B6H
B7H
B8H
B9H
BAH
BBH
BCH
BDH
BEH
BFH

24 volt error
Standalone jumper in place
Receiver open
Unit was reset or powered-up
Undefined error
Undefined error
Undefined error
Undefined error
Undefined error
EEPROM full
EEPROM checksum failed
RAM error
ROM error
CTC error
Cannot write to EEPROM
Undefined error

B.2 Device-Dependent Status Codes
The following are device-dependent status codes associated with the
TF837 magazine tape subsystem:
CODE
----

DESCRIPTION
-----------

01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
20H

Subsystem timeout
Invalid queue type
Invalid message size
Reserved
Reserved
Invalid command code
Invalid number of parameters
UART receiver error
UART input buffer overflow
Subsystem data size inconsistency
UART has stalled on transmission
Cartridge in drive
No cartridge in drive
Specified slot is empty
Specified slot is occupied
Invalid load command
Invalid unload command
DRIVE_FLAGS was zero
Retry count exhausted
End of magazine
SEND STATUS command failed
Reserved
Reserved
Retries done
Reset count exhausted
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved

B–4 Error Logs

B.3 Error Reporting Format
The following format is used to report errors that occur during subsystem
operations:

*****
*****
*****
*****

***** ldr err = error code returned by subsystem
***** ldr st = status associated with subsystem,
*****
such as recovery performed
***** cmd
= subsystem command associated with error
***** cmd par = command parameter
***** retry
= number of retries performed by subsystem

C
Wiring
Figure C–1 shows the wiring connections in the TF837 magazine tape
subsystem.

C–1

C–2 Wiring

EMI
LINE
FILTER

AC
110 V
OR
220 V

POWER
SUPPLY
YELLOW/GREEN

BROWN

+12 V

BROWN

+12 V

BLACK

GND

BLACK

GND

ORANGE

+24 V

ORANGE

+24 V

YELLOW

-12 V

YELLOW

-12 V

PWBA-MLB

BLACK

GND

BROWN

+V FAN

FAN

BLUE
BLUE

BLACK

GND

BLACK

GND

RED

+5 V

RED

+5 V

BLUE

N.C.

GREEN

+V FAN 8

X3
X8

RED

BLACK

BROWN

RED

SENSOR
DRIVE
HANDLE

BROWN

POWER SWITCH
PWBA
PDB

SENSOR
TRAY B

+5 V

RED

+5 V

LDR PRESENT L

GND

BLACK

GND

LDR XMIT +

TRAY B

BROWN

ELEP1

LDR XMIT -

DRIVEP

GND

PICKP1

LDR REC +

X3
1
SENSOR
DRIVEPOS

RED

GND

BLACK

DRIVEPOS

ORANGE

1
PWBA
SENSOR
BOARD 2

+5 V

RED

PWBA
SENSOR
BOARD 1

PICKP2

LDR REC -

TRAY F

GND

TRAY B

N.C.

ELEP2

N.C.

PWBA
TL-CONTROLLER

WHITE

BLUE

YELLOW

X10

2
3

GND R
ELEPOS

BLACK

10 GND

BROWN

+5 V

GND

STEPPER
MOTOR
HANDLE

ORANGE

YELLOW

LDR PRESENT L

LDR XMIT +

INTERLOCK
SWITCH

LDR XMIT -

10
4

GND

LDR REC +

3
X2

SENSOR
TRAY F

2
X9

RED

+24 V INT

LDR REC -

GND

CONNECTOR
HOST PORT

GND

BLACK

TRAY F

ORANGE

STEPPER
MOTOR
ELEVATOR

STEPPER
MOTOR
CARTRIDGE

RED

WHITE

BLUE

YELLOW

RED

WHITE

BLUE

+5 V

N.C.

N. C.

GND

10 GND

DRIVE OP

MHAND-A2

MHAND-A1

MHAND-B1

MHAND-B2

DIAGNOSTIC
PORT

STEPPER
MOTOR
PICKER

BROWN +12V 1

BLACK

GND

BLACK

GND

RED

+5V

2
DRIVE

X2
YELLOW

CONNECTOR
FUTURE
EXPANSION

RED

WHITE

BLUE

YELLOW

1 BLACK

GND

2 BROWN

S-LOCK
KEY
SWITCH

LOCATED IN
REAR CHASSIS

16
LO/UNL
16

15
EJECT
15

14
SLOT-S
14

13
LOD-ER
13

12
PD
12

11
DISP-S
11

10
SL 6

9
SL 5

SL 4

SL 3

6
SL 2

SL 1
5

4
SL 0

GND
2

1
+5 V

+24 V INT

LOCATED IN
LOADER

X1
PWBA OCP

SHR_X1003_89

Figure C–1

Wiring Diagram

Index
A

Access
tape drive, A–2
ANALYZE/SYSTEM command
warm swap, 6–6
Automatic mode, 2–10

Device-dependent error codes, B–2
Device-dependent status codes, B–3
Diagnostic listing, 1–13
Diagnostic utilities protocol (DUP),
4–2
Digital storage system interconnect
bus
DSSI interface, 1–10
DIRECT program, 4–6
Disabling
OCP, 2–1
Door open sensor, 6–48
Drive errors
error conditions, 5–3
Drive fault description, 5–6
Drive rewind failure, 6–51
DRVEXR program, 4–8
DRVTST program, 4–7
DSSI controller module, 1–10
power-on self-test, 3–4
DSSI node ID label, 1–4
Dual host, 1–11

B
BACKUP
Automatic mode, 2–10
Buttons
See Table 2–1

C
Cartridge compatibility, 1–10
Cartridge removal, 6–51
Checking mechanical status, 3–2
Common failure influences, 5–3
Common failure modes/symptoms,
5–3
Communications interface, 1–10
CompacTape cartridge, 1–9
loading to magazine, 2–7
unloading from magazine, 2–9
write-protect tab, 2–7
CompacTape II cartridge, 1–9
Controller
physical removal, 6–9
Controller fault description, 5–6
Current slot indicator
functions, 2–1

E
EEPROM, 3–5
Eject button
functions, 2–1
unload function, 2–3
Eject indicator
functions, 2–1
Elevator
home position, 3–2

Index 1

2 Index

Error indicators
loader faults, 5–5
magazine faults, 5–5
Error logs, B–1
Error message
SET HOST/DUP, 4–2
Error reporting format, B–4

F
Failures
during POST, 3–7
Fan
removal and replacement, 6–39
Fault description
magazine, 5–5
Fault matrix
FRU failures, 5–1
FRU
removal and replacement, 6–1
FRU failures
nondetectable, 5–2
FRUs
removing and replacing, 6–4
Functional verification, 4–13
FYDRIVER program, 4–2

G
Guidelines
removal and replacement
procedure, 6–4

H
Handle motor assembly
removal and replacement
procedure, 6–47
Hardware components, 1–6
Head Cleaning indicator
functions, 2–1
Head cleaning procedure, A–1, A–7
HISTRY program, 4–10

I
Indicators, 2–1
all flashing, 5–4
green flashing, 5–4
yellow on, 5–4
Interlock switch
removal and replacement, 6–40

J
Jam recovery procedure, 5–7

L
Load/Unload button
functions
reset, 2–1
reset function, 2–3
Load/Unload indicator
functions, 2–1
Loader
securing after head cleaning, A–9
Loader action, 5–7
Loader controller module, 1–8
Loader fault
clearing, 5–6
Loader fault description, 5–6
Loader faults, 5–5
LOADER program, 4–9
Loader transfer assembly
elevator, 1–8
power-on self-test, 3–2
removal and replacement, 6–16
Local programs, 4–1
accessing, 4–2
descriptions of, 4–1
Local utilities
descriptions of, 4–1

Index 3

M
Magazine, 1–8, 2–4
removal from receiver, 2–4
restoration into receiver, 2–9
Magazine Fault indicator
functions, 2–1
Magazine faults, 5–5
Magazine slots, 4–12
Magazine status, 5–5
Magazine tape subsystem Fault
indicator
functions, 2–1
MAGINI program, 4–13
MAGTST program, 4–12
Manually rewinding a tape, 6–51
Manual mode, 2–10
Mechanical status relative to poweron self-test, 3–2
Mechanical stops, 2–11
Mode Select key, 2–9
Automatic mode, 2–10
Manual mode, 2–10
mode definitions, 2–9
OCP Disabled mode, 2–10
Service mode, 2–11
Modes of operation, 1–4

O
OCP
operator control panel, 1–6
OCP Disabled mode, 2–10
Operating modes, 2–10
Operating procedures, 2–1
Operator control panel, 2–1
buttons
functions, 2–1
indicators
functions, 2–1
removal and replacement, 6–37
Operator control panel indicators

Operator control panel indicators
(Cont.)
status during power-on self-test,
3–1
Overview, 1–1

P
PARAMS
EXIT, 4–6
SET, 4–5
SHOW /ALL, 4–5
WRITE, 4–6
PARAMS> prompt, 4–3
PARAMS program, 4–3
Part numbers, 6–3
Picker assembly
POST, 3–2
Power On indicator
functions, 2–1
Power-on self-test
DSSI controller module, 3–4
error recording in EEPROM, 3–5
failures, 3–7
mechanical status of loader
transfer assembly, 3–2
POST, 3–1
status of drive handle, 3–2
status of OCP indicators, 3–1
TK71 tape drive, 3–4
Power supply assembly, 6–48
removal and replacement, 6–43
Problem resolution
TF837 subsystem specific, 5–1

R
Receiver, 2–4, 2–9
Recommended spares list, 6–3
Related documentation, 1–13
Removing FRUs, 6–4
Replacing controller module, 6–13
Replacing FRUs, 6–4
RESET

4 Index

RESET (Cont.)
Load/Unload button, 2–3
Restoring parameters
warm swap, 6–14

S
SDA> prompt, 6–6
Service features, 1–11
Service mode
unlocking the subsystem, 2–11
SET HOST/DUP command, 4–2,
4–12
error message, 4–2
warm swap, 6–8
SHOW CLUSTER command, 6–5
SHOW DEVICE MI command, 6–6
Slot Select button
functions, 2–1
Slot Select indicator
functions, 2–1
Soft error rates, 5–3
Software support, 1–12
Spares, 6–3
Specifications, 1–14
Storage array
SF200, 1–1
Subsystem description, 1–1
Subsystem FRUs, 6–3
Subsystem open latch, A–2
Subsystem parameters, 4–3
displaying, 4–3
saving, 4–3
setting, 4–3
System site guide, 6–6
warm swap, 6–6

T
Tape drive access, A–2
Tape In Use indicator
functions, 2–1
Tape mass storage communications
protocol, 1–12

TF837 subsystem
accessing through a specific host,
1–12
TFK70 controller functions, 3–1
TFK70 DSSI controller module
removal and replacement, 6–5
TK71 tape drive, 1–9
cartridge entrance, A–2
power-on self-test, 3–4
removal and replacement, 6–26
TK71 tape drive takeup leader
removal and replacement, 6–34
TMSCP, 1–12

U
Utilities, 4–1

W
Warm swap
collecting and recording
parameters, 6–6
listing current tape nodename,
6–5
restoring parameters, 6–14
TFK70, 6–5
Warm swap procedure
steps, 6–15
Write-Protect indicator
functions, 2–1
Write-protect tab, 2–7