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EK-TZ877-SM-A01

January 1994

110 pages

Original

3.5MB

Document:	TZ877 Magazine and Cartridge Tape Subsystem Service Manual
Order Number:	EK-TZ877-SM
Revision:	A01
Pages:	110
Original Filename:

OCR Text

TZ877 Magazine and Cartridge Tape
Subsystem Service Manual
Order Number: EK-TZ877-SM. A01

First Edition, January 1994

No responsibility is assumed for the use or reliability of software on equipment that is not
supplied by Digital Equipment Corporation or its affiliated companies.
Copyright © Digital Equipment Corporation 1994. All rights reserved. Printed in U.S.A.
The following are trademarks of Digital Equipment Corporation: CompacTape, DSSI, SCSI, TK,
TMSCP, VAX, and the DIGITAL logo.
All other trademarks and registered trademarks are the property of their respective owners.
Warning!
This is a Class A product. In a domestic environment this product may cause radio interference
in which case the user may be required to take adequate measures.
Achtung!
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb
dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer für entsprechende
Gegenmaßnahmen verantwortlich ist.
Attention!
Ceci est un produit de Classe A. Dans un environment domestique, ce produit risque de créer
des interférences radioélectriques, il appartiendra alors à l’utilisateur de prendre les mesures
spécifiques appropriées.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Overview
1.1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
Hardware Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1
Loader Transfer Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1.1
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1.2
Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2
Rear Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.1
TZ87 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.2
Power Supply Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.3
Handle Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.4
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.5
Controller Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4
CompacTape III Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.1
Cartridge Compatability . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.2
Selecting Density with the TZ877 . . . . . . . . . . . . . . . . . . . . .
1.5
Service Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.1
Controller Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–1
1–4
1–4
1–4
1–5
1–6
1–6
1–6
1–7
1–7
1–7
1–7
1–9
1–10
1–10
1–11
1–11

2 Operating Procedures
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disabling the Operator Control Panel . . . . . . . . . . . . . . . . . .
Slot Select, Load/Unload, Eject, and Density Select Button
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1
Selecting a Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2
Loading the Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3
Selecting Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3.1
Manually Unloading a Cartridge from the Drive . . . . . . .

2.1
2.1.1
2.2

2–1
2–4
2–6
2–6
2–6
2–6
2–8

iii

2.2.4
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.4
2.4.1
2.4.2
2.5
2.5.1
2.5.2
2.5.3
2.5.4

Opening the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Magazine from the Receiver . . . . . . . . . . . . . .
Inserting Cartridges into the Magazine . . . . . . . . . . . . . . . . .
Removing a Cartridge from the Magazine . . . . . . . . . . . . . . .
Restoring the Magazine to the Receiver . . . . . . . . . . . . . . . . .
Mode Select Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialization and Power-On Self-Testing . . . . . . . . . . . . . . . . . . .
Power-On Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialization of the Loader Transfer Assembly . . . . . . . . . . .
Completion of Controller Initialization . . . . . . . . . . . . . . . . . .
TZ87 Tape Drive Power-On Self-Test . . . . . . . . . . . . . . . . . . .

2–9
2–10
2–10
2–12
2–14
2–14
2–16
2–16
2–17
2–17
2–19
2–21
2–21
2–22

3 Troubleshooting Procedures
3.1
Avoiding Basic Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
Backup Operation Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
Nondetectable FRU Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1
Detecting Common Failure Influences . . . . . . . . . . . . . . . . . .
3.4.2
Soft Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.3
Common Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5
Magazine and Loader Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.1
Magazine Fault Description . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.1.1
Clearing a Magazine Fault . . . . . . . . . . . . . . . . . . . . . . . .
3.5.2
Loader Fault Description . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.2.1
Clearing a Loader Fault . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6
Power Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7
Cartridge Motion Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.1
Isolating Cartridge Motion Faults . . . . . . . . . . . . . . . . . . . . .
3.7.2
Recovering Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–3
3–4
3–4
3–4
3–5
3–6
3–6
3–7
3–7
3–8
3–8
3–8
3–9
3–11

4 FRU Removal and Replacement Procedures
4.1
4.2
4.3
4.4
4.5
4.6
4.7

Recommended Spares and Service Aids . . . . . . . . . . . . . . . . . . . .
Removal and Replacement Guidelines . . . . . . . . . . . . . . . . . . . . .
Manually Opening the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing the Controller Module . . . . . . . . . . . . .
Removing and Replacing the Loader Transfer Assembly . . . . . . .
Removing and Replacing the TZ87 Tape Drive . . . . . . . . . . . . . .
Removing and Replacing the TZ Takeup Leader . . . . . . . . . . . . .

4–1
4–4
4–5
4–5
4–9
4–12
4–18

4.8
4.9
4.10
4.11
4.12

Removing and Replacing the Operator Control Panel . . . . . . . . .
Removing and Replacing the Fan . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing the Power Supply Assembly . . . . . . . . .
Removing and Replacing the Handle Motor Assembly . . . . . . . . .
Removing and Replacing the Mode Select Key Lock . . . . . . . . . .

4–19
4–20
4–23
4–24
4–26

5 TZ87 Diagnostic Utilities and Tests
5.1
POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1
Burn-in Loopback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2
SCSI Bus Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.3
POST Terminal Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.4
Lastfail Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2
Break Key Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3
Test Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.1
Diagnostic Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.2
Diagnostic Terminal Server . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.2.1
Data Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.3
FTST03—Positioning Test . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.4
FTST05—Streaming Write Test . . . . . . . . . . . . . . . . . . . . . . .
5.3.5
FTST06—Streaming Read Test . . . . . . . . . . . . . . . . . . . . . . .
5.3.6
FTST13—Write/Read Test . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.7
STREAM Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4
SCSI Level Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.1
TEST01—SCSI Level 1 Test . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.2
TEST02—SCSI Level 2 Test . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.3
LTST09—Loader Streaming Write/Read Test . . . . . . . . . . . . .
5.4.4
LTST11—Loader Read All Test . . . . . . . . . . . . . . . . . . . . . . .
5.4.5
Retry Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

A Head Cleaning Procedure
A.1
A.1.1
A.1.2
A.2

Accessing the Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the CleaningTape III Cartridge into the Drive . . . . .
Securing the TZ877 Magazine Tape Subsystem . . . . . . . . . . .
Inserting the CleaningTape III Cartridge into the Magazine . . . .

A–5
A–7
A–8
A–9

B TZ87 Removal and Replacement Procedure
B.1
B.1.1
B.1.2
B.1.3
B.1.4
B.1.5
B.1.6
B.1.7

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Enclosure Top . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the SCSI ID Switch and Cable . . . . . . . . . . . . . . .
Removing the Internal SCSI Bus Cable . . . . . . . . . . . . . . . . .
Removing the Controller Module . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B–1
B–1
B–1
B–1
B–2
B–2
B–2
B–2

Front View of the TZ877 Operator Control Panel . . . . . . . . .
TZ877 Magazine Tape Subsystem Hardware Components . . .
Front View of the Magazine Tape . . . . . . . . . . . . . . . . . . . . .
CompacTape III Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ877 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
Front View of the TZ877 Magazine . . . . . . . . . . . . . . . . . . . .
Removing the Magazine from the Open Receiver . . . . . . . . . .
Write-Protect Switch on the CompacTape III . . . . . . . . . . . . .
Inserting a Cartridge into the Front of the Magazine . . . . . .
Removing a Cartridge from the Front of the Magazine . . . . .
Mechanical Stops Associated with Service Mode (Newer
Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Stops Associated with Service Mode (Older
Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ87 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening the Cartridge Door to Check the Tape Leader . . . . .
Loader Open Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Ejection Lever . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ877 Magazine Tape Subsystem FRUs . . . . . . . . . . . . . . . .
First Mechanical Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manually Opening the Receiver . . . . . . . . . . . . . . . . . . . . . . .
Captive Screws Securing the Controller Module Tray . . . . . .
Rear Chassis with Components and Cables . . . . . . . . . . . . . .
Left Side View of the TZ877 Subsystem . . . . . . . . . . . . . . . . .

1–3
1–5
1–6
1–9
2–5
2–9
2–11
2–12
2–13
2–15

Index
Figures
1–1
1–2
1–3
1–4
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
3–1
3–2
3–3
4–1
4–2
4–3
4–4
4–5
4–6

2–18
2–19
2–23
3–2
3–9
3–10
4–3
4–6
4–7
4–8
4–9
4–10

4–7
4–8
4–9
4–10
4–11
4–12
4–13
4–14
4–15
4–16
A–1
A–2
A–3
A–4
A–5
A–6

Loader Transfer Assembly Latch Position . . . . . . . . . . . . . . .
Front of the Magazine Showing Cartridge Slot Numbers . . . .
Second Mechanical Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ877 Subsystem Cables and Components . . . . . . . . . . . . . .
Handle Motor Assembly and Coupling Shaft . . . . . . . . . . . . .
Dust Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ87 Tape Path (Takeup Leader Replaced) . . . . . . . . . . . . . .
Removing the Operator Control Panel . . . . . . . . . . . . . . . . . .
Removing the Power Supply Assembly from the Rear
Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Lock Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CleaningTape III Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ87 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ877 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
Sliding the TZ877 Subsystem Toward You . . . . . . . . . . . . . . .
Loader Open Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–12
4–13
4–15
4–16
4–17
4–20
4–21
4–22
4–24
4–27
A–1
A–3
A–4
A–6
A–7
A–9

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

Read/Write Cartridge Compatibility with the TZ87 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ877 Magazine Tape Subsystem Specifications . . . . . . . . . .
TZ87 Tape Drive Specifications . . . . . . . . . . . . . . . . . . . . . . .
TZ877 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
Results of Density Selection . . . . . . . . . . . . . . . . . . . . . . . . . .
Loader Power-on Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nondetectable FRU Failures . . . . . . . . . . . . . . . . . . . . . . . . .
Common Failures, Causes, and Corrections . . . . . . . . . . . . . .
Field Replaceable Units and Related Procedures . . . . . . . . . .
Recommended Spares List . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Data Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–10
1–11
1–13
2–1
2–7
2–20
3–3
3–5
4–1
4–2
4–4
5–4

vii

Preface
This manual describes how to service the following tape products:
•

TZ877 magazine and cartridge tape drive subsystem

•

TZ87 tape drive

Intended Audience
This manual is for use by Digital Services engineers.

1
Overview
1.1 Overview
The TZ877 magazine tape subsystem is an electromechanical device that
performs automatic, sequential tape operations. The TZ87 tape drive, which is
a component of the subsystem, has a maximum transfer rate of 1.25 Mbytes/s.
When operating in compressed mode the maximum transfer rate is 2.5 Mbytes
/s write and 3 Mbytes/s read. The TZ877 can store:
•

More than 10.0 GB data native cartridge capacity, 70.0 GB total

•

More than 20.0 GB data at 2:1 compression ratio, 140.0 GB total

The TZ877 can load and unload tape cartridges into and from a tape drive,
providing a degree of unattended backup, as well as perform single cartridge
operations. The TZ877 subsystems perform automatic, sequential tape
operations.
These subsystems also execute operating system commands, qualifiers, and
parameters to store data from user disk areas to the tape drive.

1.2 Operating Modes
TZ877 subsystems operate in the following modes:
•

OCP Disabled mode — Locks the subsystem into the enclosure and locks
the receiver. The pushbuttons 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 — 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 pushbuttons are enabled.

Overview 1–1

Overview
1.2 Operating Modes
•

Manual mode — Locks the subsystem into the enclosure but leaves the
receiver unlocked. This mode allows for single cartridge operations only.
The OCP pushbuttons are enabled. Loading and unloading of one cartridge
to the next is not automatic; 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 when you perform
head cleaning, jam recovery, and servicing procedures.

You can select these modes through the Mode Select key (Figure 1–1).

1–2 Overview

Overview
1.2 Operating Modes
Figure 1–1 Front View of the TZ877 Operator Control Panel
OPERATOR 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

Density Select
Eject

Bus ID

Load/Unload

Slot Select

0
Power On
Write
Protected

Tape In Use
Use
Cleaning Tape

Magazine
Fault

Density
Override

Loader Fault

TK50/70

Density Select

TK85

4
Density
Override

TK86

TK50/70

TK85

TZ87

TK86

TZ87

Compress

ZKO-1217-07-DG

Overview 1–3

Overview
1.3 Hardware Components

1.3 Hardware Components
The TZ877 tape subsystem consists of the following major hardware
components (Figure 1–2):
•

Loader Transfer Assembly
Operator control panel
Magazine

•

Rear Chassis
TZ87 tape drive
Power supply assembly
Handle motor assembly
Fan
Controller module

1.3.1 Loader Transfer Assembly
The loader transfer assembly contains an elevator that moves to each storage
slot in the magazine, and to the cartridge opening in the tape drive. This
mechanism inserts and extracts the tape cartridges into and from the magazine
and drive. Signals that drive the elevator mechanics originate at the loader
transfer assembly electronics module.
1.3.1.1 Operator Control Panel
The operator control panel (OCP) has three pushbuttons—Eject, Load/Unload,
and Slot Select—as well as indicators that are used with the Mode Select key
to provide tape drive status. Chapter 2 describes how you use the OCP.

1–4 Overview

Overview
1.3 Hardware Components
Figure 1–2 TZ877 Magazine Tape Subsystem Hardware Components
LOADER TRANSFER ASSEMBLY

OCP
CABLE

OPERATOR
CONTROL
PANEL
(OCP)

BUS
CONNECTOR

INTERLOCK
SWITCH

CONTROLLER
MODULE

LATCH

MECHANICAL
EJECTION
LEVER

TZ87
TAPE
DRIVE

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

HOME POSITION
OF ELEVATOR
MLO-012144

1.3.1.2 Magazine
The TZ877 subsystem’s magazine (Figure 1–3) serves as a removable cartridge
container. The magazine stores up to seven CompacTape III cartridges.

Overview 1–5

Overview
1.3 Hardware Components
Figure 1–3 Front View of the Magazine Tape

SHR_X1023A_89

1.3.2 Rear Chassis
The rear chassis contains the TZ87 tape drive, power supply assembly, handle
motor assembly, fan, and controller module.
1.3.2.1 TZ87 Tape Drive
Using TZ87 density, the TZ87 tape drive is a streaming tape drive that can use
CompacTape III cartridges to store:
•

Up to 10.0 GB of data

•

Up to 20.0 GB of data at 2:1 compression.

Using TK85 or TK86 density, up to 2.6 GB and 6.0 GB of data can be stored
respectively.
1.3.2.2 Power Supply Assembly
The power supply assembly provides power to the rear chassis components and
to the loader transfer assembly.

1–6 Overview

Overview
1.3 Hardware Components
1.3.2.3 Handle Motor Assembly
The handle motor assembly lifts and lowers the drive’s handle when cartridges
are ready for insertion into or removal from the tape drive.
1.3.2.4 Fan
The fan cools the entire TZ877 subsystem.
1.3.2.5 Controller Module
The TZ877 magazine tape subsystem connects to the host system through a
SCSI bus. The physical interface is an electronic controller module in the rear
chassis of the TZ877 subsystem.
The subsystem uses a serial communications path to pass commands,
messages, data, and error information between the controller module and
the loader transfer assembly. A second serial communications path exists
between the controller module and the TZ87 tape drive.

1.4 CompacTape III Cartridge
The CompacTape III cartridge (Figure 1–4) is a gray plastic cartridge
containing 1200 feet of 1/2-inch magnetic, metal particle (MP) tape. The
cartridge has a write-protect switch to prevent accidental erasure of data.
When the switch is moved to the left and the small orange rectangle is visible,
data cannot be written to the tape. A package of slide-in labels and a cartridge
handling information sheet are provided with each CompacTape III cartridge.
The TZ87 drive reads and writes data in a two-track parallel, serpentine
fashion. To read/write 128 tracks—64 pairs on the tape, the TZ87 tape drive:
•

Travels the entire length of tape on two tracks (at approximately 100)
inches per second

•

Steps the head and reverses tape direction, then continues to read/write on
the next two tracks.

To ensure the reliability of cartridges that contain recorded data and that
may be archived for a long time, store the cartridges in a clean, controlled
environment with the following conditions:
•

Environmental temperature: 18.3°C to 26.1°C (65°F to 79°F)

•

Relative humidity: 20% to 60%

Overview 1–7

Overview
1.4 CompacTape III Cartridge
The above environmental conditions are also recommended for shelf storage of
cartridges that do not contain recorded data.
NOTE
Degaussing tools for erasing tapes do not work with the
CompacTape III cartridge.

1–8 Overview

Overview
1.4 CompacTape III Cartridge
Figure 1–4 CompacTape III Cartridge

ORANGE
INDICATOR
WRITEPROTECT
SWITCH

WRITEENABLED

WRITEPROTECTED
ZKO-1217-04-DG

1.4.1 Cartridge Compatability
Older CompacTape cartridges can be loaded for read or read/write purposes
into the TZ87 tape drive.
Use Table 1–1 to determine cartridge compatibility with the TZ87 drive:

Overview 1–9

Overview
1.4 CompacTape III Cartridge
Table 1–1 Read/Write Cartridge Compatibility with the TZ87 Tape Drive
Cartridge Type/Format (Capacity)

Read/Write Ability in the TZ87

CompacTape/TK50 (95 MBF)

Read only

CompacTape II/TK70 (296 MBF)

Read only

CompacTape III/TK85 (2.6 GBF)

Read/write in 85 mode1 , 2

CompacTape III/TK86 (6.0 GBF)

Read/write in 86 mode1 , 2

CompacTape III/TZ87 (10.0 GBF, 20.0 GBF
assumes 2:1 compression)

Read/write in TZ87 mode1 , 2

CompacTape III/blank

Read/write in 2.01 , 6.01 , or 10.0
mode as selected

1 Read/write, backward compatible with drive of selected density
2 Recording format can be changed to 2.0, 6.0, or 10.0 (TZ87) modes on a write from BOT.

1.4.2 Selecting Density with the TZ877
You can select density by using the Density Select button on the TZ877
operator control panel. The TZ87 tape drive defaults to using TZ87 format—
high density—for all writes from beginning of tape (BOT)—unless TK85 or
TK86 formats have been selected either on the OCP, or by the host. If you use
the OCP to select a format, it overrides any format selected by the host. When
you append data to the tape cartridge, the current media density is used.

1.5 Service Features
The TZ877 has these service features:
•

Power-on self-testing for the electronics and mechanics associated with the
loader transfer assembly, the tape drive, and the controller module

•

Automatic calibrating of the tape drive

•

Automatic home positioning of the elevator

•

Mechanical design that allows access to most field replaceable units

•

Local diagnostic programs for troubleshooting

1–10 Overview

Overview
1.5 Service Features

1.5.1 Controller Module
The TZ877 connects to the host system through a SCSI bus. The physical
interface is an electronic controller module in the rear chassis of the TZ877
subsystem.
The subsystem uses a serial communications path to pass commands,
messages, data, and error information between the controller module and
the loader transfer assembly. A second serial communications path exists
between the controller module and the TZ87 tape drive.

1.6 Specifications
Table 1–2 lists the specifications for the TZ877 magazine tape subsystem, and
Table 1–3 lists those for the TZ87 tape drive.
Table 1–2 TZ877 Magazine Tape Subsystem Specifications
Characteristic

Specifications

Height

26.47 cm (10.42 in)

Width

22.20 cm (8.74 in)

Length

64.77 cm (25.5 in)

Weight

24.95 kg (55 lb)

Noise level

62 dB

Environmental temperature
Operating

10°C to 40°C (50°F to 104°F)

Nonoperating

–40°C to 66°C (–40°F to 150°F)

Humidity
Operating

20% to 80% noncondensing

Nonoperating

10% to 95%

Certification
EMI

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

Safety

Meets UL, CSA, TUV "BG" MARK and IEC standards

Maximum number of cartridges

Electrical rating

100 to 120/220 to 240 V ac 2/1 amp

Continued on next page

Overview 1–11

Overview
1.6 Specifications
Table 1–2 (Continued) TZ877 Magazine Tape Subsystem Specifications
Characteristic

Specifications

AC power consumption

110 W, typical
113 W, maximum

Communications interface

SCSI-2 bus (single-ended or differential)

Cycle time

50 s, maximum

1–12 Overview

Overview
1.6 Specifications
Table 1–3 TZ87 Tape Drive Specifications
Characteristic

Specification(s)

Mode of operation

Streaming

Media

12.77 mm (1/2 in) unformatted magnetic tape

Track density

256 tracks/in

Bit density

62,500 bits/in

Number of tracks

128

Transfer rate, raw
native

1.71 MBytes/s

Transfer rate, user
native uncompressed

1.25 MBytes/s

Transfer rate, user
compressed1

More than 2.50 MBytes/s maximum write

Tape speed

110 in/s

Track format

Two-track parallel, serpentine recording

Cartridge capacity

10.0 GB, formatted, native
20.0 GB, formatted, compressed
Assumes 2:1

More than 3.00 MBytes/s maximum read

1 Compression ratio is data dependent.

Overview 1–13

2
Operating Procedures
This chapter describes the various TZ877 operating procedures.

2.1 Operator Control Panel
The TZ877 operator control panel (OCP) has 4 pushbuttons and 23 indicators
that are used with the Mode Select key (Table 2–1). The Mode Select key is
described later in this chapter. See Section 2.2 for more details on button and
indicator operations.
Table 2–1 TZ877 Operator Control Panel
Button/Indicator

Color

State

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 to the magazine.

Eject indicator

Green

Indicates a magazine fault,
and that you can press
the Eject button to unload
cartridges from the drive to
the magazine and to open the
receiver.

Load/Unload button

–

Loads the currently selected
cartridge into the tape
drive. Unloads the cartridge
currently in the tape drive.
Resets the subsystem if there
is a loader fault.
Continued on next page

Operating Procedures

2–1

Operating Procedures
2.1 Operator Control Panel
Table 2–1 (Continued) TZ877 Operator Control Panel
Button/Indicator

Color

State

Function

Load/Unload indicator

Green

Indicates you can press the
Load/Unload button.

Slot Select button

–

Increments the current slot
indicator to the next slot.

Slot Select indicator

Green

Indicates you can press the
Slot Select button. Pressing
this button moves the current
slot indicator to the next slot.

Power On indicator

Green

Indicates the TZ877 is in a
known good power state (ac
and dc voltages are within
tolerance).

Write Protected indicator

Orange

The cartridge currently in the
drive is write-protected by
one of these methods:
Setting the write-protect
switch to write-protect.
Using software write-protect
qualifiers.

Tape In Use indicator

Yellow

Off

The current cartridge is
write-enabled.

Slow
blinking

Tape is rewinding.

Rapid
blinking

Tape is reading or writing.

On steadily

A cartridge is in the drive
and the tape is not moving.

Off

No cartridge is in the drive.

Use Cleaning Tape indicator

Orange

The read/write head needs
cleaning. See Appendix A.

Magazine Fault indicator

Red

Indicates a magazine failure.

Loader Fault indicator

Red

Indicates a loader transfer
assembly error or drive error.
Continued on next page

2–2 Operating Procedures

Operating Procedures
2.1 Operator Control Panel
Table 2–1 (Continued) TZ877 Operator Control Panel
Button/Indicator

Color

State

Function

Current slot indicators 0–6

Green

Identifies the current slot.
Each current slot indicator
blinks when its corresponding
cartridge moves to or from
the drive. Also used with the
Magazine Fault or Loader
Fault indicator to show the
type of fault.

Density Select

Green

You can choose a density on
the OCP

Auto

Yellow

Host selection is disabled.
Selection mode is manual.

TK50/TK70

Indicates all of the following:

1. Tape was recorded in
TK50/TK70 format.

2. You chose to read the
tape in TK85 format.

TK85

TK86

Yellow

Blinking

Indicates all of the following:
•

Tape was recorded in
TK85 format.

•

You chose to read the
tape in TK85 format.

Indicates one or all of the
following:
•

Tape was recorded in
TK86 format.

•

You chose to read/write
the tape in TK86 format.

Tape is recorded in another
density. You selected this
density for a write from BOT.
Continued on next page

Operating Procedures

2–3

Operating Procedures
2.1 Operator Control Panel
Table 2–1 (Continued) TZ877 Operator Control Panel
Button/Indicator

Color

State

Function

TZ87

Yellow

Indicates one or all of the
following:

Compress

Density Override

•

Tape was recorded in
TZ87 format.

•

You chose to read/write
the tape in TZ87 format.

Blinking

Tape is recorded in another
density. You selected this
density for a write from BOT.

Yellow

You selected compression
mode.

Off

Compression mode is
disabled.

A density selection was set
from the drive’s front panel.

Off
(default)

Density selection is under
host control, or automatic

Blinking

You are in density selection
mode.

Yellow

2.1.1 Disabling the Operator Control Panel
To disable the operator control panel (Figure 2–1), set the mode select key to
OCP Disabled. This prevents unwanted manual intervention when the TZ877
subsystem is running unattended.

2–4 Operating Procedures

Operating Procedures
2.1 Operator Control Panel
Figure 2–1 TZ877 Operator Control Panel
OPERATOR 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

Density Select
Eject

Bus ID

Load/Unload

Slot Select

0
Power On
Write
Protected

Tape In Use
Use
Cleaning Tape

Magazine
Fault

Density
Override

Loader Fault

TK50/70

Density Select

TK85

4
Density
Override

TK86

TK50/70

TK85

TZ87

TK86

TZ87

Compress

ZKO-1217-07-DG

Operating Procedures

2–5

Operating Procedures
2.2 Slot Select, Load/Unload, Eject, and Density Select Button Functions

2.2 Slot Select, Load/Unload, Eject, and Density Select
Button Functions
Slot Select, Load/Unload, Eject, and Density Select are OCP pushbuttons.
They have a green indicator and are operable only when their corresponding
indicators are lit.
NOTE
Load/Unload has three functions: load, unload, and reset. If a loader
fault occurred and the Loader Fault indicator is lit, press Load/Unload
to reset the TZ877 subsystem.

2.2.1 Selecting a Cartridge
To select a cartridge: Press the Slot Select button to advance the slot indicator
to the next available slot. After successful initialization, the TZ877 subsystem
automatically selects the first slot that has a cartridge and the Slot Select
button becomes active. The Load/Unload and Eject indicators remain lit during
slot selection.

2.2.2 Loading the Cartridge
Press the Load/Unload button to load the cartridge into the drive. If no
cartridge is loaded, the Select Slot, Load/Unload, and Eject indicators turn
off and the elevator moves to the selected slot, shown by the indicator. The
cartridge is then removed from the magazine and placed in the elevator. The
elevator moves to the drive position and inserts the cartridge into the drive.
The indicators remain off until the tape loads to the beginning of tape (BOT).
After the cartridge is loaded into the drive, the Eject and Load/Unload
indicators light and the corresponding buttons are enabled. The Slot Select
indicator remains off.

2.2.3 Selecting Density
NOTE
The only time you can change tape density is on a write from BOT. You
cannot change tape density on a read operation.

2–6 Operating Procedures

Operating Procedures
2.2 Slot Select, Load/Unload, Eject, and Density Select Button Functions
Modes of Selecting Density
You can select density by any of these modes:
1. Use the front panel Density Select button. Using the selection button
always overrides other methods.
2. Use a host selection—assuming operating system support. If you do not
use the Density Select button, host selection is used.
3. Use the native format. If you do not use an OCP or host selection, then the
default (TZ877) format is used.
How to Select Density
To select density with the TZ877:
1. Press the Load/Unload button to load the cartridge into the drive.
2. Use one of the selection methods to select the desired format (2.0, 6.0 or
10.0).
3. Issue a command that will cause a write from BOT, for example, from
VMS, the INITIALIZE command.
4. After calibration completes, the yellow Tape in Use indicator remains lit,
and one of the yellow Tape Density indicators lights to indicate current
tape density.
5. You can use the Density Select button at any time, not just after loading
a tape. A new selection will not take place until you do a write from BOT.
The controller remembers the command you gave until you do one of the
following:
•

Change the selection you made.

•

Unload the tape. When you unload the tape, the controller forgets the
density selection.

•

Eject the magazine from the loader.

Table 2–2 Results of Density Selection
If . . .

Then . . .

You did not use the
Density Select button

The LEDs show the actual density when the tape is reading
and writing. The LEDs light steadily and the Selection LED
is off.
Continued on next page

Operating Procedures

2–7

Operating Procedures
2.2 Slot Select, Load/Unload, Eject, and Density Select Button Functions
Table 2–2 (Continued) Results of Density Selection
If . . .

Then . . .

You used the Density
Select button, and if the
actual tape density is
the same as the density
you selected

The LED next to one of the yellow indicators showing actual
density selection and Density Select lights steadily. For
example, if the actual tape density is 10.0 and the selected
tape density is 10.0, then the LED next to 10.0 lights.

You used the Density
Select button, and if
the actual tape density
differs from the density
selected:

The LED next to the actual density lights steadily. The LED
next to the selected density blinks and the Density Select
LED flashes.

For example, if the actual tape density is 10.0 and the
selected density is 6.0, the 10.0 LED lights steadily, the 6.0
LED blinks, and the Density Select LED blinks. On a write
from BOT the tape is reformatted to the selected density
and the following occurs: the 10.0 indicator shuts off, the
6.0 indicator lights steadily, and the Density Select indicator
lights steadily.

NOTE
To select density over the SCSI bus, implement a Mode Select (SCSI-2)
command with the desired density and write data to the tape from
BOT.

2.2.3.1 Manually Unloading a Cartridge from the Drive
If a cartridge does not unload from the tape drive when you press the Load
/Unload or Eject button on the operator control panel, 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.
To manually rewind the tape, (assuming 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.
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.

2–8 Operating Procedures

Operating Procedures
2.2 Slot Select, Load/Unload, Eject, and Density Select Button Functions
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 2–2). 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 switch 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.

Figure 2–2 Front View of the TZ877 Magazine

SHR_X1023A_89

2.2.4 Opening the Receiver
The Eject button opens the receiver for inserting or removing the magazine. It
is disabled when the Mode Select key is in the OCP Disabled position. You can
also use the Eject button to unload a cartridge from the drive.

Operating Procedures

2–9

Operating Procedures
2.2 Slot Select, Load/Unload, Eject, and Density Select Button Functions
NOTE
When a cartridge is not in the drive, the Slot Select, Load/Unload, and
Eject indicators are lit before any operation begins. Pressing the Eject
button causes all indicators to turn off. The elevator then returns to its
home position and the receiver opens.
When a cartridge is in the drive, the Eject and Load/Unload indicators
are lit before the operation begins. When you press the Eject button
both indicators turn off and the cartridge unloads from the drive and
returns to the magazine. The receiver then opens to allow access to the
magazine.
In both situations, once the receiver closes again, a magazine scan
begins, and the indicators light again when the scan is complete.

2.3 Magazine
This section describes how to remove the TZ877 magazine from the receiver,
load and unload cartridges into and from the magazine, and restore a magazine
to the receiver.

2.3.1 Removing the Magazine from the Receiver
To remove the magazine from the TZ877 subsystem, first be sure that:
•

The Power On indicator is lit (Figure 2–1).

•

The Eject indicator is lit before you press the Eject button.

Then:
1. Press the Eject button to open the receiver.
2. Grasp the receiver and gently pull it forward to access the magazine.
3. Grasp the magazine’s handle and lift the magazine out of the receiver
(Figure 2–3).

2–10 Operating Procedures

Operating Procedures
2.3 Magazine
Figure 2–3 Removing the Magazine from the Open Receiver

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

Operating Procedures

2–11

Operating Procedures
2.3 Magazine

2.3.2 Inserting Cartridges into the Magazine
To insert a cartridge use the following steps:
1. Grasp the cartridge with the CompacTape III label up and the write-protect
switch toward you (Figure 2–4).
2. Set the write-protect switch to the correct position.
3. Push the cartridge into the slot until it stops and you hear a click
(Figure 2–5).
Figure 2–4 Write-Protect Switch on the CompacTape III

ORANGE
INDICATOR

c
pa

II
eI

WRITEPROTECT
SWITCH

WRITEENABLED

WRITEPROTECTED
SHR_X1020C_89

2–12 Operating Procedures

Operating Procedures
2.3 Magazine
Figure 2–5 Inserting a Cartridge into the Front of the Magazine
BACK OF
MAGAZINE

5
5

NOTE: Push tape in
until a click is heard

SLOT
NUMBERS
0-6

FRONT OF
MAGAZINE

ZKO-1217-05-DG

Operating Procedures

2–13

Operating Procedures
2.3 Magazine

2.3.3 Removing a Cartridge from the Magazine
To remove a cartridge from the magazine, push the cartridge farther into the
slot and then release (Figure 2–6).
NOTE
Never apply labels to the top or bottom of tape cartridges. This can
cause a cartridge to jam in the magazine.

NOTE
Never move the metal tab on the left side of the magazine slot in an
attempt to remove the cartridge. This will cause a magazine fault.

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

2–14 Operating Procedures

Operating Procedures
2.3 Magazine
Figure 2–6 Removing a Cartridge from the Front of the Magazine

BACK OF
MAGAZINE

NOTE: Push tape in
until a click is heard

4
4

5
5

SLOT
NUMBERS
0-6

FRONT OF
MAGAZINE

ZKO-1217-06-DG

Operating Procedures

2–15

Operating Procedures
2.4 Mode Select Key

2.4 Mode Select Key
The Mode Select key (Figure 2–1) locks the loader transfer assembly into the
enclosure and also locks the magazine into the receiver.

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

OCP Disabled mode — Automatically loads and unloads cartridges as
necessary during backup procedures. When you insert the magazine into
the receiver and close the receiver, the loader scans the magazine. The first
cartridge in the magazine automatically loads into the drive.
Operations stop if you are copying data to tape and either the storage
capacity of the last cartridge is exceeded, or no cartridge is in the next
sequential slot in the magazine.
To lock the TZ877 subsystem into the enclosure and lock the receiver, set
the Mode Select key to OCP Disabled mode. The OCP pushbuttons are
disabled.

•

Automatic mode — Is the default, or ‘‘normal,’’ mode of the TZ877. 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 cartridge is exceeded, or no cartridge
is in the next sequential slot in the magazine.
To lock the TZ877 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 and the OCP pushbuttons
are enabled.

•

Manual mode — Automatic loading and unloading of cartridges does not
occur. You must press the Load/Unload button to move cartridges. This
mode is most useful for, but not restricted to, copying specific files to or
from tape.
To lock the TZ877 into the enclosure, set the Mode Select key to Manual
mode. The receiver is unlocked and can be opened; the OCP pushbuttons
are enabled.
NOTE
During Manual mode, the cartridge returns to the magazine, but the
current slot indicator does not advance to the next available cartridge.

2–16 Operating Procedures

Operating Procedures
2.4 Mode Select Key

2.4.2 Service Mode
Use Service mode to perform head cleaning and servicing procedures.
To unlock the TZ877 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. On newer models, the rear ship lock
must be unscrewed first.
Newer models have one mechanical stop associated with Service Mode
(Figure 2–7); older models have two stops (Figure 2–8).
On models with two mechanical stops, the first stop lets you pull the front
chassis forward from the enclosure to:
•

Remove a faulty loader transfer assembly

•

Remove a faulty operator control panel

•

Remove a faulty power supply assembly

•

Perform the head cleaning procedure

Press the first stop to access the second stop. You can then pull the rear
chassis forward from the cabinet. This position provides access to the following
field replaceable units (FRUs):
•

Tape drive

•

Handle motor assembly

•

Controller module

For specific instructions on how to access the internal assemblies of the TZ877
subsystem, see Chapter 3.

2.5 Initialization and Power-On Self-Testing
This section describes initialization of the subsystem, and the component
power-on self-tests (POSTs) that occur when you power on the TZ877
subsystem.
At power-on, the following components run simultaneous, but separate,
self-tests:
•

Loader transfer assembly

Operating Procedures

2–17

Operating Procedures
2.5 Initialization and Power-On Self-Testing
Figure 2–7 Mechanical Stops Associated with Service Mode (Newer Models)

•

TZ87 tape drive

•

Controller module

The following subsections show the sequence in which initialization occurs.

2–18 Operating Procedures

Operating Procedures
2.5 Initialization and Power-On Self-Testing
Figure 2–8 Mechanical Stops Associated with Service Mode (Older Models)

FIRST
MECHANICAL
STOP

SECOND
MECHANICAL
STOP

SHR-X0147C-90-CPG
ZKO-1285-05-DG

2.5.1 Power-On Self-Test
Table 2–3 explains what happens during each phase of the TZ877 operation.

Operating Procedures

2–19

Operating Procedures
2.5 Initialization and Power-On Self-Testing

Table 2–3 Loader Power-on Self-test
Phase

What Happens

When you turn on the TZ877 subsystem, the OCP Loader Fault and Power
On indicators light.

One second later, all OCP indicators light. Within 15 seconds, power-on
self-test (POST) of the loader mechanics completes.
•

If the Magazine Fault and Loader Fault indicators turn off, loader POST
succeeded.

•

If the Magazine Fault and Loader Fault indicators stay lit, loader POST
failed.

A few seconds later, the drive controller resets the loader.

Loader POST starts again.
If . . .

Then POST . . .

The Magazine Fault and Loader Fault indicators
turn off and shortly after, all OCP indicators,
except for Power On, turn off,

Passed

The Magazine Fault and Loader Fault indicators
stay lit,

Failed

NOTE
If the Magazine Fault or Loader Fault indicator remains lit, POST
detected an error. See Chapter 3 for error conditions.
5

The elevator scans the magazine to determine which slots contain cartridges.
Continued on next page

2–20 Operating Procedures

Operating Procedures
2.5 Initialization and Power-On Self-Testing
Table 2–3 (Continued) Loader Power-on Self-test
Phase

What Happens

If the subsystem magazine has a cartridge in slot 0, and no cartridge is in
the drive, these indicators should be lit:
•

Power On

•

Eject

•

Load/Unload

•

Slot Select

•

Slot 0

2.5.2 Initialization of the Loader Transfer Assembly
When the controller module completes its self-test successfully, it initializes the
loader transfer assembly and all OCP indicators light. This occurs about 10
seconds after power-up.
If no errors occur, the controller module turns off the OCP indicators, except
for Power On, and initiates a magazine scan.
The magazine scan causes the elevator to move to each cartridge slot, moving
each cartridge slightly in its position. The associated slot indicator then lights.
This process completes in about 60 seconds, depending on the number of
cartridges in the magazine.

2.5.3 Completion of Controller Initialization
Upon successful execution of loader transfer assembly initialization by the
controller module, and assuming the TZ877 subsystem has a magazine with a
cartridge in slot 0, the following indicators light:
•

Power On

•

Eject

•

Load/Unload

•

Slot Select

•

Slot 01

Or the indicator of the first available slot lights.

Operating Procedures

2–21

Operating Procedures
2.5 Initialization and Power-On Self-Testing
If the Mode Select key is not in OCP Disabled mode, the Slot Select, Load
/Unload, and Eject buttons are enabled.
If the controller module detects a loader transfer assembly or tape drive error
during its initialization, the OCP Loader Fault and current slot indicators
display the device in error.
NOTE
If the above initialization sequence does not complete successfully,
check the results of the controller module and tape drive self-tests. If
the controller module self-test completed successfully, you can diagnose
failures in the drive or subsystem by using the DUP diagnostic
programs in Chapter 5.

2.5.4 TZ87 Tape Drive Power-On Self-Test
The TZ87 drive runs its self-test during power-on or during a reset process. A
successful self-test is indicated by the Operate Handle indicator being lit if
no cartridge is installed or by the Tape in Use indicator being lit if a cartridge
is installed (Figure 2–9).
If the self-test is not successful, all indicators on the TZ87 front panel blink.
You must open the loader transfer assembly to observe the TZ87 front panel
indicators.

2–22 Operating Procedures

Operating Procedures
2.5 Initialization and Power-On Self-Testing
Figure 2–9 TZ87 Front Panel

0
K

85
T

86
T

d
oa
n
nl
to
U
ut t
o
B gh
T
i
ss L
re
P t
is
ai
th
W
n
pe
pe
O dle Ta
an ve
o
em

t
ad
gh
Lo
Li
o
T
t
ai his
t
W
n
pe
O dle pe
a
T
an
H
rt
se his
t
In
se
lo e
C dl
an

se
U
ed
g
e
n
ct
in
i
at dle
n
te te
e
e a pe per an
ri ro
ap Us Cle Ta
W P
O H
T

ty id
si err
en Ov

ty t
si lec
en Se

CARTRIDGE INSERT/RELEASE HANDLE (DOWN)

ZKO-1217-27-DG

2–23

Operating Procedures

3
Troubleshooting Procedures
This chapter describes failures that are not detectable through diagnostics,
error conditions, magazine and loader faults, power problems, and cartridge
motion faults.

3.1 Avoiding Basic Problems
Follow these guidelines when operating the TZ877 subsystem to avoid basic
problems:
•

Use CompacTape III cartridges or for read-only operations, use
CompacTape or CompacTape II cartridges.

•

Check the tape leader in the cartridge by lifting the cartridge latch that
opens the door to expose the leader. Be sure the leader is in the same
position as the one shown in Figure 3–1.
CAUTION
Do not touch exposed portions of the magnetic tape. If the tape leader
is not in the correct position, use a new cartridge.

•

Be sure the receiver is fully closed and the current slot indicator is lit for
the starting cartridge.

•

Be sure no slots in the magazine are empty between the starting
cartridge and the expected completion cartridge.
NOTE
The TZ877 subsystem unloads and loads the next cartridge when the
subsystem receives a DISMOUNT command from the host system.

Troubleshooting Procedures 3–1

Troubleshooting Procedures
3.1 Avoiding Basic Problems
Figure 3–1 Opening the Cartridge Door to Check the Tape Leader

CARTRIDGE
LEADER

DOOR LOCK
(RELEASE BY LIFTING
DOOR LOCK WITH THUMB)
SHR-0002-86
SHR_X1027_89_CPG

3.2 Backup Operation Failure
Some manual operations, if not performed correctly, may cause backup
operations to fail:
•

Loading CompacTape or CompacTape II cartridges when executing write
operations

•

Loading write-protected CompacTape III cartridges when executing write
operations

•

Selecting the incorrect cartridge slot.

3–2 Troubleshooting Procedures

Troubleshooting Procedures
3.3 Nondetectable FRU Failure

3.3 Nondetectable FRU Failure
Table 3–1 describes situations that can occur with field replaceable unit
(FRU) failures not detectable through diagnostics. These failures may cause
subsystem failure.
Table 3–1 Nondetectable FRU Failures
FRU

Possible Failure

Tape drive communications cable

After you replace either a faulty drive or a
loader transfer assembly, 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, the OCP pushbuttons
or the indicators do not function. (All
indicators turn off briefly at power-on.)

Fan

Inspection required.

See Chapter 3 for information on removing and replacing faulty FRUs.

Troubleshooting Procedures 3–3

Troubleshooting Procedures
3.4 Error Conditions

3.4 Error Conditions
This section describes error conditions, failure influences, and soft error rates.
It also includes information on magazine and loader faults. Table 3–2 lists
common failures, causes, and corrections.

3.4.1 Detecting Common Failure Influences
Many factors may influence failures:
•

Defective media

•

Operator or user errors

•

Incorrect backup commands

•

Poor power or grounding
NOTE
The tape drive may appear to be the failing unit due to the operation
being performed at the time of failure (such as backup). Before you
replace the drive, ensure that any problems you find are not due to the
above factors.

3.4.2 Soft Errors
Soft errors are normally considered to be events rather than errors. In the case
of soft errors, no data is lost. For a write operation, the data is rewritten.
For a read operation, 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

Changes in soft error rates for any particular drive and cartridge are more
significant than an absolute number of soft errors. This is due to the variables
described in Table 3–2.

3–4 Troubleshooting Procedures

Troubleshooting Procedures
3.4 Error Conditions
When examining the drive error count, you can detect soft and hard errors.
For example, an error occurs if you give the wrong label name during a mount.
Be sure the errors indicate a real hardware problem before replacing the drive.

3.4.3 Common Failures
Table 3–2 lists common failures, their probable causes, and possible
corrections.
Table 3–2 Common Failures, Causes, and Corrections
Symptom

Probable Cause

Possible Fix

Failure to mount or
initialize with new media

Bad media or dirty head

Clean the head and retry
with another cartridge.

OCP pushbutton
indicators blinking

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
blinking

Drive leader unhooked in
drive

Clear the error by pressing
the Unload button on the
drive or the Load/Unload
button on the OCP.

Calibration error
Mispositioned cartridge
leader

Inspect the cartridge leader
for correct position. Do not
use the cartridge if you
cannot reposition the leader
(Figure 3–1).
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, or manually remove
the cartridge from the drive
(Section 2.2.3.1).

Troubleshooting Procedures 3–5

Troubleshooting Procedures
3.5 Magazine and Loader Faults

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

Magazine Fault — An operator-correctable condition in most cases,
indicated by the Magazine Fault indicator being lit.

•

Loader Fault — A condition indicated by the Loader Fault indicator being
lit. It most likely requires service from Multivendor Customer Services.

3.5.1 Magazine Fault Description
A magazine fault is indicated by the Magazine Fault and Eject LEDs being lit.
A magazine fault can occur when:
1. A cartridge has been removed from the magazine incorrectly.
2. A cartridge was manually unloaded from the drive.
3. A cartridge that was loaded into the drive by the loader was manually
unloaded and put back into the magazine.
4. A cartridge was manually inserted into the drive.
NOTE
This can only occur if the loader has been opened, requiring service
intervention. This cannot occur under normal operation.

Detecting cases 1, 2, and 3: These can be detected when the Magazine Fault
indicator is lit and slot indicators 0 and 5 are lit.
Never remove a cartridge from the magazine by moving the metal tab in front
of the cartridge. This is the main source of magazine faults. Use the correct
cartridge insertion/removal procedure (Sections 2.3.2 and 2.3.3) to clear a
magazine fault caused by cases 1, 2, and 3:
•

Press the Eject button to open the receiver.

•

Remove the magazine and check for a metal tab over an open slot. This is
the slot from which the cartridge was removed.
If a metal tab is found over a open slot then:
Reinsert the missing cartridge correctly, pushing the cartridge in
until it snaps into place. If no cartridge is needed in this slot, push
a cartridge into the slot and then remove it according to the normal
cartridge insertion/removal procedure. This step is critical to avoid
additional magazine faults.

3–6 Troubleshooting Procedures

Troubleshooting Procedures
3.5 Magazine and Loader Faults
Insert the magazine into the receiver.
Close the receiver.
•

If no metal tab is covering an empty slot, the cartridge loaded into the
drive was manually removed and reinserted into the magazine.
To clear this case, just close the receiver.

Detecting case 4, the cartridge was manually loaded into the drive. This can
be detected by the Magazine Fault LED and slot LEDs 0 and 6 being lit. This
is the only time LEDs 0 and 6 will be lit.
To clear the Magazine Fault caused by case 4:
•

Press the Eject button to open the receiver

•

Remove the magazine

•

Reach in and manually unload the tape from the drive by pressing the
unload button.

•

When the drive beeps and the green Operate Handle indicator lights, you
can remove the cartridge by lifting the drive handle.

•

Remove the cartridge.

•

Reinsert the magazine and close the receiver.

3.5.1.1 Clearing a Magazine Fault
To clear a magazine fault, press the Eject button to open the receiver and
remove the magazine. Remove the cartridge from the drive or elevator if
present. Close the receiver and the drive controller clears the magazine fault.
While the magazine is out, make sure there are no retention flags showing
in empty slots. After the fault clears, try loading and unloading cartridges to
verify operation.

3.5.2 Loader Fault Description
A loader fault indicates the TZ877 subsystem detected a fatal error in either
the loader transfer assembly or the tape drive. In some loader transfer
assembly errors, the subsystem attempts three retries before declaring a fatal
error. All loader faults generate an error log, cause the Loader Fault indicator
to light, and generate an associated subcode.
The Loader Fault indicator displays both loader and drive errors. The presence
of a fault is displayed by the following slot indicators:
•

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

Troubleshooting Procedures 3–7

Troubleshooting Procedures
3.5 Magazine and Loader Faults
•

Slots 5 and 0 light to indicate the loader detected a fault.

•

Slots 6 and 0 light to indicate a drive fault.
NOTE
Error indicators do not blink. During hardware failures, action is
determined by the controller module.

3.5.2.1 Clearing a Loader Fault
When a loader fault occurs, the Load/Unload and Eject indicators are lit. When
you press the Load/Unload button, the TZ877 subsystem attempts to clear the
error. When you press the Eject button, the receiver opens to let you access the
magazine.

3.6 Power Problems
If the Power On indicator is not lit, or the host system does not recognize the
TZ877 subsystem:
•

Verify that the subsystem is seated completely into the enclosure. (Power
to the loader transfer assembly is disabled when the subsystem is
positioned forward.)

•

Verify that the subsystem configuration is correct.

3.7 Cartridge Motion Faults
Occasionally, a cartridge motion fault can occur in the elevator or drive
mechanism. A cartridge motion fault is indicated when:
•

The Magazine Fault indicator on the OCP is lit.

•

A cartridge cannot be loaded or unloaded.

•

An unusual sound is heard in the motor.

This section describes how to remove cartridges from a loader transfer
assembly without harming the loader or data. It does not provide information
on fault-finding, repair, or maintenance of the loader.

3–8 Troubleshooting Procedures

Troubleshooting Procedures
3.7 Cartridge Motion Faults

3.7.1 Isolating Cartridge Motion Faults
Most cartridge motion problems result from worn or damaged magazines or
cartridges.
To isolate cartridge motion faults:
1. Set the Mode Select key to Automatic mode, returning the subsystem to its
‘‘normal’’ mode.
2. Attempt to reproduce the error.
3. Open the loader transfer assembly (Figure 3–2) to locate or remove the
cartridge in question.
Figure 3–2 Loader Open Latch
LOADER OPEN LATCH

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

4. Open the receiver by squeezing the mechanical ejection lever (Figure 3–3)
to remove the magazine.

Troubleshooting Procedures 3–9

Troubleshooting Procedures
3.7 Cartridge Motion Faults
Figure 3–3 Mechanical Ejection Lever
BUS
CONNECTOR

LOADER TRANSFER ASSEMBLY

INTERLOCK
SWITCH
OCP
CABLE

CONTROLLER
MODULE

RIGHT
CAPTIVE
SCREWS

OPERATOR
CONTROL
PANEL
(OCP)
LATCH

TK85
TAPE
DRIVE

MECHANICAL
EJECTION
LEVER

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

HOME POSITION
OF ELEVATOR
SHR-X0147H-92-CPG
ZKO-1285-01-DG

5. Insert the cartridge into the magazine from the rear, replacing the
cartridge in its original slot (the metal tab next to the slot number
indicates the original slot).
NOTE
The subsystem may indicate a magazine fault due to reinserting the
cartridge into the magazine as described in the preceding process. To

3–10 Troubleshooting Procedures

Troubleshooting Procedures
3.7 Cartridge Motion Faults
clear this magazine fault, remove the magazine from the receiver and
close the receiver. When the Eject indicator lights, insert the magazine
back into the subsystem.

The OCP indicators signal when you can cycle cartridges into and out of the
drive. Concentrate on the cartridge in question, but be sure to test the others
as well. There should be no difference in the action taken by the mechanics
due to an OCP or system command.

3.7.2 Recovering Cartridges
Cartridge motion problems may be caused by a fault in one of the following
components. Suggestions for recovering cartridges follow:
•

Magazine — Cartridge motion problems caused by faulty magazines are
usually indicated by problems that occur when the elevator attempts to
return the cartridge to the magazine. Replace the magazine and see if
the problem persists. You may not be able to find a magazine problem by
inspection alone. For example, a damaged surface finish in or near a slot,
causing excessive friction, may not be obvious.

•

Cartridge — Cartridge motion problems that occur with one cartridge only
are likely to be caused by that particular cartridge. Move the cartridge to
another slot and note if the problem occurs there as well. Faulty cartridges
can also cause problems in the drive area. Check the leader positioning in
both drive and cartridge and the operation of the cartridge door.

•

Tape drive or handle motor assembly — Cartridge motion problems
caused by a faulty or misaligned tape drive occur when the tape is loaded
into or unloaded from the drive. Check for problems in the tape drive door
or tape drive alignment. See Chapter 3 to ensure that the handle motor
assembly is correctly assembled and in the correct position.

•

Loader transfer assembly — Faults caused by the loader transfer
assembly are usually not field repairable. Replacement of the loader
transfer assembly is required.

Troubleshooting Procedures 3–11

4
FRU Removal and Replacement
Procedures
This chapter describes how to remove and replace field replaceable
units (FRUs) in the TZ877 subsystem. The chapter also provides lists of
recommended spares and service aids.
TZ877 subsystem FRUs cannot be removed unless the system is powered down.
For a list of the FRUs and references to their removal and replacement
procedures, see Table 4–1. For guidelines to removing and replacing the FRUs,
see Section 4.2.
Table 4–1 Field Replaceable Units and Related Procedures
FRU

Procedure Section

Controller module

4.4

Loader transfer assembly

4.5

Tape drive

4.6

Tape drive takeup leader

4.7

Operator control panel

4.8

Fan

4.9

Power supply assembly

4.10

Handle motor assembly

4.11

Key lock switch

4.12

4.1 Recommended Spares and Service Aids
Table 4–2 the recommended spare parts. It includes a description of each spare
with a reference to a figure showing the spare.

FRU Removal and Replacement Procedures 4–1

FRU Removal and Replacement Procedures
4.1 Recommended Spares and Service Aids
Table 4–2 Recommended Spares List
Part Number

Description

Figure

TZ87 -TBS

TZ87 cartridge tape drive, 10.0 gigabytes

4–1

–

Controller module, SCSI

4–1

70-28824-01

Takeup leader kit

4–13

17-02613-01

Drive communications cable

4–3

29-28102-01

Loader transfer assembly

4–1

29-28103-01

Power supply 110 V ac, 50/60 Hz

4–1

29-28103-02

Power supply 220 V ac, 50/60 Hz

4–1

29-28104-01

Operator control panel

4–1

29-28106-01

Handle motor assembly

4–1

29-28972-01

Loader transfer assembly communications cable
— 10-pin cable connecting to drive controller

4–6

29-28974-01

Loader power harness — provides dc power for
the drive, controller, and fan

–

17-01249-02

Internal SCSI cable — 50-pin controller module
cable connecting to the loader bulkhead

4–5

29-28976-01

Loader transfer assembly power cable — 10-pin
cable connecting to power supply

4–6

29-28977-01

Loader transfer assembly OCP cable — 16-pin
cable connecting to loader transfer assembly
connecting to power supply–

29-28979-01

Transfer assembly key switch cable — 3-pin cable
connecting to loader transfer assembly

4–6

29-28980-01

Handle open sensor cable — 3-pin cable
connecting to power supply

4–10

29-28981-01

Key lock assembly

4–6

12-23374-13

Fan

4–1

Table 4–3 lists service aids for use by Digital’s engineers only.

4–2 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.1 Recommended Spares and Service Aids
Figure 4–1 TZ877 Magazine Tape Subsystem FRUs
LOADER TRANSFER ASSEMBLY

OCP
CABLE

OPERATOR
CONTROL
PANEL
(OCP)

BUS
CONNECTOR

INTERLOCK
SWITCH

CONTROLLER
MODULE

LATCH

MECHANICAL
EJECTION
LEVER

TZ87
TAPE
DRIVE

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

HOME POSITION
OF ELEVATOR
MLO-012144

FRU Removal and Replacement Procedures 4–3

FRU Removal and Replacement Procedures
4.1 Recommended Spares and Service Aids

Table 4–3 Service Aids
Part Number

Description

30-32447-01

Magazine

29-28982-01

Loader transfer assembly key — universal key that fits loader
transfer assembly key lock

TK85-HC

CleaningTape III cartridge

70-27592-02

Field test cartridge

29-26246-00

Static discharge protective field service kit

4.2 Removal and Replacement Guidelines
Always follow these guidelines when you perform any FRU removal and
replacement procedure in this chapter.
1. Observe all electrostatic discharge (ESD) precautions.
2. Always use the static discharge protective field service kit (antistatic mat
and wristbands).
3. Set the Mode Select key to Service mode.
4. Be sure that a tape is not in the drive. If a tape is present, dismount the
tape by using a console command. Then press the Eject button to open
the receiver and remove the magazine. If the receiver does not open, see
Section 4.3, Manually Opening the Receiver.
5. To power down the TZ877 subsystem, set the power switch to 0 (off) and
disconnect the power cord.
6. Do not disconnect the external SCSI cable unless the system is powered
down. Doing so while the system is running can cause system failure and
possible loss of customer data.
7. To maintain stability, slide only one TZ877 subsystem at a time from the
enclosure. On newer models the screws in the back of the subsystem must
be removed before the subsystem can slide out.
NOTE
During shipment, the subsystem is locked into the enclosure by a
shipping restraint. Be sure to disengage this restraint (Figure 4–3)
before removing the subsystem.

4–4 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.2 Removal and Replacement Guidelines

8. When sliding the subsystem in or out of the enclosure, be sure that the
connector wires and cables are not tangled or snagged.
9. Do not misplace the screws that are not captive (Figure 4–4). They are
metric and not readily available.
10. Use the power-on self-test (POST) and local diagnostic programs to
diagnose most FRUs. (For nondiagnostic-detectable failures, see the
subsystem- and drive-specific problem resolution sections).
11. Use the field test cartridge when verifying the TZ877 subsystem after the
removal and replacement procedures are complete.

4.3 Manually Opening the Receiver
If the receiver does not open when you press the Eject button during a removal
or replacement procedure, follow these steps:
1. Open the rear door of the TZ877 subsystem enclosure.
2. From the rear of the enclosure, slide the TZ877 subsystem forward to the
first mechanical stop (Figure 4–2).
3. Squeeze the mechanical ejection lever (Figure 4–3) to open the receiver.

4.4 Removing and Replacing the Controller Module
Removal Procedure TZ Models Only
1. Remove the subsystem from the enclosure.
2. Remove the controller module from the plastic locking tabs.
3. Disconnect the internal SCSI cable from the controller module (Figure 4–5).
4. Disconnect the power cables.
5. Press the locking tabs to release the module.
6. Disconnect the remaining cables and remove the module.

FRU Removal and Replacement Procedures 4–5

FRU Removal and Replacement Procedures
4.4 Removing and Replacing the Controller Module
Figure 4–2 First Mechanical Stop

FIRST
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106B_89

Replacement Procedure TZ Models Only
1. Connect the loader transfer assembly communications cable (Figure 4–6)
and the drive communications cable before setting the controller module
into the module tray.

4–6 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.4 Removing and Replacing the Controller Module
Figure 4–3 Manually Opening the Receiver
DRIVE COMMUNICATIONS
CABLE

FIRST
MECHANICAL
STOP

SECOND
MECHANICAL
STOP

MECHANICAL
EJECTION LEVER

SHIPPING
RESTRAINT

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

2. Seat the controller on the plastic locking tabs.
3. Connect the power cable.
4. Connect the internal SCSI cable from the controller module (Figure 4–5).
NOTE
The SCSI ID is set by a switch on the rear plate of the loader.

FRU Removal and Replacement Procedures 4–7

FRU Removal and Replacement Procedures
4.4 Removing and Replacing the Controller Module
Verification Procedure
Power up the TZ877 subsystem.
Execute POST to verify successful removal and replacement.
Figure 4–4 Captive Screws Securing the Controller Module Tray
BULKHEAD
CONNECTOR
SCREWS

CONTROLLER
MODULE
TRAY
SCREWS

BULKHEAD
CONNECTOR

FAN SCREWS

SHR-X0145A-92-CPG

4–8 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.5 Removing and Replacing the Loader Transfer Assembly
Figure 4–5 Rear Chassis with Components and Cables
MODULE TRAY

INTERNAL
CABLE

BULKHEAD
CONNECTOR
SHIPPING
RESTRAINT
SCREW

TRAY
SCREWS

POWER SWITCH

SHR-X0141C-92-CPG

4.5 Removing and Replacing the Loader Transfer Assembly
Removal Procedure
1. Open the rear door of the enclosure.
2. Power down the TZ877 subsystem.
3. After opening the receiver, grasp under the top of the front bezel and slide
the subsystem to the first mechanical stop.
4. Close the receiver.
5. Open the loader transfer assembly. Flip the hinge/locking lever to the
release position. Lift the transfer assembly from the two hinge pins.

FRU Removal and Replacement Procedures 4–9

FRU Removal and Replacement Procedures
4.5 Removing and Replacing the Loader Transfer Assembly
Figure 4–6 Left Side View of the TZ877 Subsystem
LOADER
TRANSFER ASSEMBLY
COMMUNICATIONS CABLE

HINGE LOCKING LEVER

LOADER
TRANSFER ASSEMBLY
POWER CABLE

LEFT
CAPTIVE
SCREWS

GROUND
STRAP

CABLE CLAMPS

KEY LOCK
ASSEMBLY

TRANSFER ASSEMBLY
KEY SWITCH CABLE
SHR-X0143-90-CPG

6. Place the loader transfer assembly on an antistatic mat.
7. Note the number on the node ID label on the OCP.
8. Remove the OCP from the loader transfer assembly (Figure 4–7). Place the
OCP on an antistatic mat.
9. Package the loader transfer assembly in the box that contained the new
loader transfer assembly. Return it to the repair depot.
Replacement Procedure
1. Remove the empty OCP bezel from the new loader transfer assembly.
2. Install the original OCP into the new loader transfer assembly.
3. Place the new loader transfer assembly on the rear chassis hinge pins. The
loader transfer assembly must be open.
4. Press the bottom part of the hinge locking lever to clamp the top hinge pin.
4–10 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.5 Removing and Replacing the Loader Transfer Assembly
5. Reconnect the ground strap.
6. Reconnect the loader transfer assembly communications cables to the
electronics module. Secure the cable clamps.
7. Close the loader transfer assembly. Be sure the latch is closed.
8. Slide the TZ877 subsystem into the enclosure.
9. Complete and install a new node ID label. The label should contain the
same information as the label on the faulty unit.
10. Secure the rear door of the SF200, SX100, or SX300 storage array.
Verification Procedure
1. Power up the TZ877 subsystem. Be sure all OCP indicators are lit. The
power-on self-test executes successfully in about 15 seconds. Except for
the Loader Fault indicator, all indicators are lit until the host system
initializes the TZ877 subsystem.
2. Press the Eject button to open the receiver.
3. Insert a field test cartridge into slot 0 at the front of a spare magazine
(Figure 4–8). Be sure the cartridge is write-enabled.
4. Insert the magazine into the receiver.
5. Close the receiver. The elevator performs a magazine scan.
When the receiver is closed after a power-up, a full extended scan is
performed. Each cartridge is pulled into the elevator and put back into the
slot. This takes longer than the normal scan of 15 seconds.
6. Press the Load/Unload button to verify load operation. Be sure the Load
/Unload and Tape In Use indicators are on after the cartridge loads into
the drive.
7. Press the Load/Unload button again to unload the cartridge.
8. Be sure the Load/Unload, Eject, and Slot Select indicators are on after the
cartridge unloads.
9. Press the Eject button to remove the magazine from the receiver.
10. Close the receiver.

FRU Removal and Replacement Procedures 4–11

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
Figure 4–7 Loader Transfer Assembly Latch Position
BUS
CONNECTOR

LOADER TRANSFER ASSEMBLY

INTERLOCK
SWITCH
OCP
CABLE

CONTROLLER
MODULE

RIGHT
CAPTIVE
SCREWS

OPERATOR
CONTROL
PANEL
(OCP)
LATCH

TK85
TAPE
DRIVE

MECHANICAL
EJECTION
LEVER

POWER SUPPLY
ASSEMBLY

HANDLE
MOTOR
ASSEMBLY

FAN
(LOCATED ON
OUTSIDE REAR
OF UNIT)

HOME POSITION
OF ELEVATOR
SHR-X0147H-92-CPG
ZKO-1285-01-DG

4.6 Removing and Replacing the TZ87 Tape Drive
Removal Procedure
1. Power down the TZ877 subsystem.
2. After opening the receiver, grasp the top of the front bezel and slide the
subsystem to the first mechanical stop.
3. Close the receiver.
4–12 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
Figure 4–8 Front of the Magazine Showing Cartridge Slot Numbers

SHR_X1023A_89

4. Open the rear door of the enclosure.
5. Release the two captive screws that secure the controller module tray
(Figure 4–4).
6. Release and slowly pull the tray about three-fourths from the rear chassis.
Proceed carefully as the tray can be removed fully from the rear chassis.
The TZ does not have the tray.
7. Disconnect the internal DSSI or SCSI cable (Figure 4–5) from the controller
module.
8. Loosen the screws that secure the bulkhead connector (Figure 4–4).
9. Remove the cable assembly from the rear of the tray.
10. Press the first mechanical stop to access the second mechanical stop
(Figure 4–9).
11. Lift the latch to open the loader transfer assembly.
12. Loosen the four captive screws that secure the drive at the right
(Figure 4–7) and left (Figure 4–6) sides of the rear chassis. Each screw is
recessed inside a nut. Do not try to loosen these nuts.

FRU Removal and Replacement Procedures 4–13

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
13. Slide the plastic tab on the handle motor assembly about one inch to the
right (Figure 4–10). (You may have to move the drive slightly to release
the plastic tab.)
14. Rotate the plastic tab toward the handle motor assembly.
15. Pull the drive toward you almost fully out of the rear chassis.
16. Disconnect the power cable and the drive communications cable
(Figure 4–3) from the rear of the drive.
Replacement Procedure
1. Slide the replacement drive halfway into the rear chassis.
2. Connect the power cable and drive communications cables to the rear of
the drive.
3. Slide the drive into the rear chassis.
4. Align the drive handle shaft with the handle motor coupling shaft
(Figure 4–11). Carefully position cables when sliding the drive into the
chassis to ensure no damage occurs from snagging.
5. Engage the drive shaft with the handle motor coupling shaft.
6. Push the handle motor coupling shaft toward the drive; it partially slips
onto the handle shaft. Place the rotated plastic tab 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.
7. Locate the plastic tab on the drive. This tab and the small metal tab
(write-protect switch) are inside the cartridge opening next to the Tape In
Use indicator on the bezel. This assembly locks the drive handle. You must
push it to the right to lift the handle.
NOTE
Failure to release the plastic tab before lifting the handle could cause
damage. Do not force the handle against the locking mechanism.

4–14 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
Figure 4–9 Second Mechanical Stop

SECOND
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106C_89

8. With the handle in the open position, apply pressure to the handle coupling
shaft and slowly rotate the drive handle downward. You may have to move
the drive slightly to seat the shaft firmly.

FRU Removal and Replacement Procedures 4–15

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
Figure 4–10 TZ877 Subsystem Cables and Components

PLASTIC
TAB

HANDLE
MOTOR
ASSEMBLY
CUTOUT
INTERMEDIATE
BEZEL

2-PIN INTERLOCK
SWITCH CABLE

4-PIN HANDLE
MOTOR ASSEMBLY
CABLE

CABLE
CLAMP

3-PIN OPEN HANDLE
SENSOR CABLE
SHR-X0147D-90-CPG

9. Engage the mounting screws of the chassis to the drive. Tighten the screws
in the following order; left front, left rear, right front, and the right rear
last.
NOTE
If you have difficulty seating the handle motor coupling shaft, repeat
the above steps.

10. Slide the TZ877 subsystem into the enclosure.
NOTE
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.

4–16 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
Figure 4–11 Handle Motor Assembly and Coupling Shaft

DRIVE
HANDLE
SHAFT

HANDLE
MOTOR
COUPLING
SHAFT

SENSOR
ASSEMBLY
ARM
PIVOT
GEAR
PINION
GEAR

PLASTIC
TAB

STOPPER
SHR-0067-89
SHR-X0146A-90-CPG

11. Tighten the two captive screws that secure the controller module tray
(Figure 4–4).
12. Redress the external DSSI or SCSI communications cables into the cable
restraints on the rear chassis.
13. Redress the power cable into the cable restraints.
14. Verify a secure power connection at both ends of the power cable.
Verification Procedure
1. Power up the TZ877 subsystem.
2. Press the Eject button to open the receiver.

FRU Removal and Replacement Procedures 4–17

FRU Removal and Replacement Procedures
4.6 Removing and Replacing the TZ87 Tape Drive
3. Install a field test cartridge tape into slot 0 at the front of a spare
magazine. Be sure that the cartridge’s write-protect tab is next to the slot
number on the front of the magazine.
4. Install the spare magazine into the receiver.
5. Execute LDRTST.
6. Secure the rear door of the SF100, SF200, or SF300 storage array.

4.7 Removing and Replacing the TZ Takeup Leader
Removal Procedure
1. Remove the TK/TZ drive from the enclosure. Refer to the previous section.
CAUTION
Contamination from hands could cause increased error rates. Put on
cloth gloves to prevent oils and grease from contaminating the tape
path.

2. At the rear of the drive, loosen the two screws that secure the metal
module clip. Remove the clip that holds the controller in place from the top
of the drive dust cover.
NOTE
In the TZ877 subsystem, the controller is not mounted on the drive.
The metal module clip may not be present.

3. Remove the dust cover (Figure 4–12) first by pulling on the tab of the
center rear clip and undoing the clip. Undo the left front clip and the front
center clip. You can use a finger or screwdriver to undo the clips. Each clip
is next to a small slot that fits a screwdriver.
4. If the drive leader is connected to the hook, push on the hook’s back end
(Figure 4–13). Pull out the leader.
5. Use needlenose pliers to unhook the leader from the retaining hook in the
center hub of the takeup reel (Figure 4–13).

4–18 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.7 Removing and Replacing the TZ Takeup Leader
Replacement Procedure
1. Slide the leader end into the takeup reel slot (make sure the leader’s
orientation is correct). Grab the leader end with the needlenose pliers and
push the leader hole around the retaining hook in the reel.
2. Form the drive leader around the top of the tape path and push the leader
down into the rollers, between the rollers and plastic shield. You cannot
push the leader through the tape path. Make sure the leader is not over
the top flanges of the rollers.
3. Push the drive leader out so it is in front of the hook that slips into the
rectangular hole of the leader end.
4. Make sure the new leader is installed correctly (Figure 4–13).
5. Replace the dust cover and the metal module clip.
6. Replace the TZ87 drive into the enclosure. Refer to the previous section.

4.8 Removing and Replacing the Operator Control Panel
Removal Procedure
1. Open the rear door of the enclosure.
2. Power down the TZ877 subsystem.
3. Close the rear door of enclosure.
4. After opening the receiver, grasp the top front bezel and slide the
subsystem to its first mechanical stop.
5. Remove the three screws (Figure 4–14) that secure the operator control
panel assembly to the loader transfer assembly.
6. Disconnect the cable from the OCP (Figure 4–6).
7. Remove the operator control panel.
Replacement Procedure
Reverse the preceding steps.
Verification Procedure

FRU Removal and Replacement Procedures 4–19

FRU Removal and Replacement Procedures
4.8 Removing and Replacing the Operator Control Panel
Figure 4–12 Dust Cover

LEFT FRONT
CLIP TAB
FRONT CENTER
CLIP TAB

CENTER REAR
CLIP TAB
MKV-X3102-91

Execute the power-on self-test (POST).
All OCP indicators, except for the Loader Fault indicator, are lit until the host
system initializes the subsystem.

4.9 Removing and Replacing the Fan
Removal Procedure
1. Open the rear door of the enclosure.
2. Power down the TZ877 subsystem.

4–20 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.9 Removing and Replacing the Fan
Figure 4–13 TZ87 Tape Path (Takeup Leader Replaced)
TAKEUP
LEADER

BUCKLING
LINK

NOTCH IN
LEADER

K
85
T
K
86
C
om
pr
es

t
ad
gh
Lo
Li
o
T
t
is
ai
th
W
n
pe
O le pe
d
a
T
an
H
rt
se his
t
In
se
lo e
C dl
an

d
oa
n
nl
to
U
ut t
o
B gh
T
i
ss L
re
P
t
ai his
t
W
n
pe
pe
O dle Ta
an ve
o
em

T
s

se
U
ed
e
ng
ct
in
at dle
ni
te te
e
e a pe per an
ri ro
ap Us Cle Ta
W P
O H
T

e
ty t
ty id
si ec
si rr
en l
en ve
D Se
D O

nl
oa
d

CARTRIDGE INSERT/RELEASE
HANDLE (DOWN)

TAKEUP
LEADER

BUCKLING
LINK

CORRECT
LOCATION
OF LEADER

ACCEPTABLE

LEADER
UNHOOKED

UNACCEPTABLE

TAKEUP
LEADER
NOTCH

LEADER
DISPLACED
ABOVE
LINK

MLO-012146

3. At the TZ877 rear chassis, remove the two screws (Figure 4–4) that secure
the fan. Remove and set aside the fan’s grill.

FRU Removal and Replacement Procedures 4–21

FRU Removal and Replacement Procedures
4.9 Removing and Replacing the Fan
Figure 4–14 Removing the Operator Control Panel

3 SCREWS

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

NOTE
For reinstallation, note the airflow toward the rear and the orientation
of the fan’s power wires before disconnecting the wires.

4. Remove the fan.
Replacement Procedure
Reverse the preceding steps.
To ensure correct airflow, be sure to reconnect the fan’s power wires in their
original orientation.
Verification Procedure
1. Power up the TZ877 subsystem.
2. Observe the counterclockwise rotation of the fan.

4–22 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.10 Removing and Replacing the Power Supply Assembly

4.10 Removing and Replacing the Power Supply Assembly
Removal Procedure
1. Open the rear door of the enclosure.
2. Power down the TZ877 subsystem.
3. From the rear of the enclosure, push the TZ877 subsystem to the first
mechanical stop.
4. From the side, lift the latch to open the loader transfer assembly.
5. Remove the intermediate bezel by loosening the captive screws that secure
it (Figure 4–10).
6. Disconnect the cable connections at the front of the power supply assembly
(Figure 4–15).
7. Thread the cables into the cutouts.
8. Grasp the top cover of the power supply assembly to lift it. You can push
up on the power supply assembly through the small opening in the bottom
of the rear chassis. Then pull the assembly forward.
9. Remove the assembly.
Replacement Procedure
Reverse the preceding steps.
Verification Procedure
1. Power up the TZ877 subsystem. If the Power On indicator fails to light,
slide the subsystem farther into the enclosure to activate the interlock
switch.
2. Press the Load/Unload button to return the cartridge to the magazine if a
cartridge is in the drive.

FRU Removal and Replacement Procedures 4–23

FRU Removal and Replacement Procedures
4.11 Removing and Replacing the Handle Motor Assembly
Figure 4–15 Removing the Power Supply Assembly from the Rear Chassis

POWER SUPPLY
ASSEMBLY
SHR-0013-90
SHR-X0142-90-CPG

4.11 Removing and Replacing the Handle Motor Assembly
Removal Procedure
1. Open the rear door of the enclosure and power down the TZ877 subsystem.
NOTE
If the OCP Tape in Use indicator is lit, a cartridge is in the drive. Set
the Mode Select key to the Manual position. Press the Load/Unload
button to return the cartridge to the magazine. If this fails, manually
unload the cartridge after opening the loader transfer assembly.

2. From the rear of the enclosure, push the TZ877 subsystem to the first
mechanical stop.
3. From the side, lift the latch to open the loader transfer assembly.

4–24 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.11 Removing and Replacing the Handle Motor Assembly
4. Release the two captive screws that secure the controller module tray
(Figure 4–4). Slide the tray several inches from the TZ877 subsystem’s
rear chassis.
5. Press the first mechanical stop to access the second mechanical stop.
6. Remove the intermediate bezel (Figure 4–10).
7. Remove the two right-hand connector plugs from the power distribution
panel. (The left is a 3-pin connector attached to the handle down sensor
assembly; the right is a 4-pin connector attached to the handle motor
assembly.) Thread these connectors through the side metal cutout
(Figure 4–10).
8. Release the cable clamp (Figure 4–10).
9. Slide the plastic tab (Figure 4–10) on the handle motor coupling shaft to
the right; rotate the tab upward.
10. Loosen the three captive screws (Figure 4–11) located at the outer corners
of the handle motor assembly.
11. Grasp the handle motor assembly, and slide it slightly upward and to the
right to remove it from the subsystem.
NOTE
You do not have to remove the motor screws or disconnect the shaft
coupling mechanism.
Replacement Procedure
Before you replace the handle motor assembly, be sure the sensor
assembly arm rests on the plastic stopper located on the pivot gear
(Figure 4–11). You may have to move 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. Place the handle motor coupling shaft back into its opening. Be sure to
fully seat it to ensure that the subsystem closes properly.
3. Carefully place the connector wires inside the cable clamp; thread the
connectors through the metal cutout.
4. Align and connect the connector plugs to the power distribution panel.
5. Replace the intermediate bezel, and fasten the captive screws.
FRU Removal and Replacement Procedures 4–25

FRU Removal and Replacement Procedures
4.11 Removing and Replacing the Handle Motor Assembly
6. Close the magazine tape subsystem.

4.12 Removing and Replacing the Mode Select Key Lock
Removal Procedure
1. Open the rear door of the enclosure down the TZ877 subsystem.
2. From the rear, push the TZ877 subsystem to the first mechanical stop.
3. Open the cable clamp on the left side (Figure 4–6) of the loader transfer
assembly to release the cable wires.
4. Loosen the captive screw of the top protective panel and remove the panel
(Figure 4–16).
5. Detach the 3-pin plug by sliding it from the 3-pin connector.
NOTE
To avoid breaking connections, detach the plug from the top rather
than pulling the wires from the bottom of the connector.

6. Set the Mode Select key to the OCP Disabled position and remove the key
from the key lock switch.
7. Loosen the two mounting screws (Figure 4–16) of the key lock switch
bracket.
NOTE
The key lock switch bracket does not include captive screws and
washers; prepare to catch them after they are loosened.

8. Slide the key lock switch bracket out of position.
Replacement Procedure
1. With the subsystem still at the first mechanical stop, align the new key
lock switch bracket over the mounting holes.
2. Place the Mode Select key back in the key lock switch to hold the lock in
the Service mode position.
3. Fasten the screws and washers (Figure 4–16) of the bracket.
4. Connect the 3-pin plug (Figure 4–16) into the controller module.

4–26 FRU Removal and Replacement Procedures

FRU Removal and Replacement Procedures
4.12 Removing and Replacing the Mode Select Key Lock
5. Place the connector wires in the cable clamp and close the clamp.
6. Replace the top protective cover by aligning and tightening the captive
screw to the standoff nut (Figure 4–16).
7. Slide the subsystem back into the enclosure.
Figure 4–16 Key Lock Assembly

3-Pin
Cable

Screw
3-Pin
Connector

Protective
Panel

Key Lock
Switch
Mounting
Screws

Mode
Select
Key

MKV-X3100-91

FRU Removal and Replacement Procedures 4–27

5
TZ87 Diagnostic Utilities and Tests
This chapter describes the diagnostic utilities and tests for the TZ877 tape
drive.

5.1 POST
The controller power-on self-test (POST) program runs whenever the controller
module is reset. It is reset through a power cycle, or from the terminal server.
Reset is indicated when the green indicator is not lit. The yellow indicator
flashes during the tests, and if POST completes successfully and the
operational firmware initializes correctly, the green indicator lights.

5.1.1 Burn-in Loopback Mode
POST diagnostics normally notify the executive that starts the rest of the
controller operating system. However, a loopback feature is available. At the
start of testing, the state of the burn-in pin is saved. At the end of testing,
and before the executive is notified, the diagnostics test the saved state. If the
burn-in is true, POST loops.
Detailed test information is printed at the start of testing if the burn-in
connector is present. (The jumper is removed while POST is executing.)

5.1.2 SCSI Bus Termination
POST requires that the SCSI bus be properly terminated and powered. If the
device is not connected to a SCSI bus, the internal terminating resistors must
be installed in the terminator position, and the terminator power jumper must
be installed in the PWR position. If the device is connected to a SCSI bus, the
bus must be terminated according to SCSI termination requirements.
If the SCSI bus is not terminated, POST will not execute. This is indicated
by the status of the controller indicators. The green (OK) indicator flashes,
and the yellow (ACTIVE) indicator lights continuously. If the indicators are
as above, terminate the SCSI bus to allow POST to execute and start the
operational firmware, if no other errors are detected.

TZ87 Diagnostic Utilities and Tests 5–1

TZ87 Diagnostic Utilities and Tests
5.1 POST

5.1.3 POST Terminal Server
The diagnostic terminal attached to the controller prints information about the
run of the tests. During normal operation, the test currently running is the
last test printed.
Any failures detected may be due to the last test running, except for one
instance–when an unexpected interrupt is generated, the error lists the cause
of the interrupt. The header displays that it was an unexpected interrupt.
The POST terminal server supports the following commands:
•

Control/C: Clears the POST pass count.

•

Control/H: Halts POST and resets the controller to start again. Use this
command only after an error is detected. Do not disconnect or cycle the
power supply.

•

Control/P: Prints the POST pass count.

5.1.4 Lastfail Information
There may be additional information about the failure. This information is
displayed on the terminal and may be useful for diagnosing the cause of the
failure. Currently there is additional failure information displayed on the
diagnostic terminal for:
1. RAM Mach II pattern testing on the RAM buffers (microprocessor and EZ).
The expected and actual data patterns as well as the physical hardware
address of the miscompare is displayed.
2. ROM EDC test: The expected and calculated EDC are displayed.
3. Register initialization: The expected and actual values as well as the
physical hardware address of the register are displayed.

5.2 Break Key Operation
During POST testing, the Break key causes the POST kernel to list information
about the last error detected including the last fail information if any.
Currently there is one limitation—using the Break key during the local RAM
testing may cause a miscompare error. It is recommended that the Break key
not be used while POST is running.

5–2 TZ87 Diagnostic Utilities and Tests

TZ87 Diagnostic Utilities and Tests
5.3 Test Descriptions

5.3 Test Descriptions
The tests described in the following sections test the functionality of the
TZ87 subsystem. These tests return statistical information to the originating
process. Unique error codes are returned to help determine the FRU that
caused the error. If the program can determine the FRU error, it is included.
Otherwise, you must either run more tests or determine the error from the
data returned in the statistical information.

5.3.1 Diagnostic Server
The control portion of the microdiagnostics is known as the diagnostic server.
The server interfaces with the diagnostic terminal server and the SCSI port.
The diagnostic server creates SCSI packets and interprets responses from
the SCSI server. The diagnostic server also acts as the interface for the
tests with the remainder of the TZ87 firmware. Gathering and computing
statistics is also done by the diagnostic server. The diagnostic server handles
all communication within the controller.
When a test is complete, the diagnostic server compiles statistics and then
either sends them to the diagnostic terminal server for transmission to the
diagnostic terminal, or to the SCSI port for retrieval by the host.

5.3.2 Diagnostic Terminal Server
The diagnostic terminal server is a separate task that verifies all diagnostic
terminal communication. The SCSI port is also a separate task and verifies all
communications with the host.
When you issue a ds command to the diagnostic terminal server or when the
SCSI port receives a Send Diagnostic command from the host, it prompts the
diagnostic server to search the diagnostic test directory. If the program is
found, the diagnostic server attempts to gain exclusive access to the subsystem
by issuing an online command with exclusive access requested. If this is
successful, the program starts. All programs run to completion or until you
issue a dk command.
5.3.2.1 Data Patterns
The following table displays program data patterns:

TZ87 Diagnostic Utilities and Tests 5–3

TZ87 Diagnostic Utilities and Tests
5.3 Test Descriptions
Table 5–1 Program Data Patterns
Pattern

Name

Data in Hex

Rotate

Use different pattern for each file

All 0s

00 00 00 00 00

FF FF FF FF FF

Alternating 1s and 0s

55 5A AA A5 55 5A AA A5

Marching 1

01 02 04 08 10 20 40 80

Marching 0

FE FD FB F7 EF DF BF 7F

0E 0E 0E 0E 0E 0E 0E 0E

MFM

DE AD DE AD DE AD DE AD

AA AA AA AA AA AA AA AA

Random data

5.3.3 FTST03—Positioning Test
This test checks the repeatability of the drive’s repositioning ability. It writes
10 blocks of records to tape of random record and byte counts. You determine
the starting data when you invoke the test. The tape then is repositioned
throughout the area that has been written using the SKIP TAPE MARK, SKIP
RECORD, and SPACE OBJECT commands, both in the forward and reverse
directions.
After each reposition, a record is read and a software data compare is
performed. This test also writes a special diagnostic field at the beginning of
tape so that other diagnostic tests can recognize it. By reading the diagnostic
field, other tests can recreate the data that is written to the tape and perform
read operations with data compare.
NOTE
Depending on the RAM parameters, DIAGTRACE and DIAGMASKRECSZ
limitations are placed on the maximum number of records and byte
counts for each block of records. If DIAGTRACE is 1, the maximum
number of records a block of records can have is 3966. If it is 0, the
maximum number of records a block of records can have is 1023. If
DIAGMASKRECSZ is 1, the maximum byte count of a record is 32767.
If it is 0, the maximum byte count of a record is 65535.

5–4 TZ87 Diagnostic Utilities and Tests

TZ87 Diagnostic Utilities and Tests
5.3 Test Descriptions
The runtime parameter you can change is the data pattern. This test executes
in about 40 minutes.

5.3.4 FTST05—Streaming Write Test
This test verifies the drive’s ability to write data in a streaming manner.
Unless you specify otherwise, a random number of blocks of records are written
to tape of varying record and byte counts. The default amount of data is set
to ensure a track turnaround and a head step operation. You specify the data
pattern as well; if no data pattern is specified, the data pattern defaults to a
rotating pattern. This test also writes a diagnostic field on the tape so that
other tests can recreate the data that is written to the tape and perform read
operations with data compare.
The runtime parameters you can change are the record count, byte count, and
data pattern.

5.3.5 FTST06—Streaming Read Test
This test checks the accuracy of the drive while reading data in a streaming
manner. It uses the seeds left from a previous write or positioning test to
create the data used for software data compares. Software data compare
operations are performed on pseudo randomly chosen records of data.
If a diagnostic field read using this test is written by FTST03, this test
performs in the same manner as the FTST03, with the exception of the write
procedure.
The runtime parameters you can change are the byte count and data pattern.

5.3.6 FTST13—Write/Read Test
This test writes data to the tape in a streaming manner. Data buffers are
reused rather than being refilled with new data. Any data patterns can be
used. The data buffers are filled once, when starting a write from BOT;
therefore the tape does not stream for the first few records. Once all the
buffers are accessed, the tape streams for the remaining time.
Read operation is as previously described, except that no data compares are
done. This ensures the tape streams continuously while reading.
The runtime parameters you can change are the record count, byte count, and
data pattern. This test executes in approximately two hours when writing and
reading the entire tape.

TZ87 Diagnostic Utilities and Tests 5–5

TZ87 Diagnostic Utilities and Tests
5.3 Test Descriptions

5.3.7 STREAM Test
This test calls the FTST05 and FTST06 tests and executes in about nine hours.

5.4 SCSI Level Tests
The following sections describe the SCSI level test.

5.4.1 TEST01—SCSI Level 1 Test
Because a full power-up is not necessary, be sure the controller hardware and
software is functioning properly before invoking this diagnostic test.
This test is an extension of the power-up self-tests. The EDC is calculated for
the whole ROM and compared with the last long word of ROM. Two queues
that the controller software uses is checked by dequeuing and enqueuing items.
If there is a loader attached, a software reset is done. When complete, errors
are passed to the extended sense bytes of the REQUEST SENSE data.
This test executes in about five seconds.

5.4.2 TEST02—SCSI Level 2 Test
This test has two modes of operation: default and non default. Default mode
writes, then reads fifty 32,768 byte records. Non default mode has the host
providing runtime parameters. A statistical report and any errors are passed
on in the REQUEST SENSE data. Default mode executes in about five
minutes.

5.4.3 LTST09—Loader Streaming Write/Read Test
This test cycles and loads all cartridges that are in sequence in the magazine.
It writes and then reads until EOT is done on all cartridges.

5.4.4 LTST11—Loader Read All Test
This test cycles and loads all cartridges that are in sequence in the magazine.
It reads until LEOT is done on all cartridges.

5.4.5 Retry Algorithm
The diagnostics utilize the subsystem’s retry algorithms as implemented by
the drive and controller firmware. All hard write errors and undetected read
errors are considered to be fatal.

5–6 TZ87 Diagnostic Utilities and Tests

A
Head Cleaning Procedure
The TZ877 magazine tape subsystem uses the CleaningTape III cartridge
(Figure A–1) for cleaning the read/write head in the tape drive.
The CleaningTape III cartridge is a yellow plastic cartridge containing 1200
feet of 1/2-inch, magnetic particle (MP) cleaning tape. You can use the
CleaningTape III cartridge about 20 times before it expires.
Figure A–1 CleaningTape III Cartridge

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III

SHR_X1020E_89

Head Cleaning Procedure A–1

Head Cleaning Procedure

You can use two procedures to clean the read/write head:
1. Access the tape drive and load the CleaningTape III cartridge directly into
the drive (Section A.1).
2. Insert the CleaningTape III cartridge into the magazine, where it then
loads into the drive (Section A.2).
Step 2 is recommended for cleaning the TF857/TF867 and the TZ857
/TZ867. Accessing the tape drive directly as in step 1 above may result in
a magazine fault.
NOTES
Perform the head cleaning procedure only when the orange Use
Cleaning Tape indicator (Figures A–2 and A–3) is lit.
If the Loader Fault indicator is lit, clear the fault before proceeding
with head cleaning.

A–2 Head Cleaning Procedure

Head Cleaning Procedure

Figure A–2 TZ87 Front Panel

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CARTRIDGE INSERT/RELEASE HANDLE (DOWN)

ZKO-1217-27-DG

Head Cleaning Procedure A–3

Head Cleaning Procedure

Figure A–3 TZ877 Operator Control Panel
OPERATOR 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

Density Select
Eject

Bus ID

Load/Unload

Slot Select

0
Power On
Write
Protected

Tape In Use
Use
Cleaning Tape

Magazine
Fault

Density
Override

Loader Fault

TK50/70

Density Select

TK85

4
Density
Override

TK86

TK50/70

TK85

TZ87

TK86

TZ87

Compress

ZKO-1217-07-DG

A–4 Head Cleaning Procedure

Head Cleaning Procedure
A.1 Accessing the Drive

A.1 Accessing the Drive
To access the drive:
1. Be sure all TZ877 subsystem operations are stopped.
2. Ensure that the Eject indicator is lit (Figure A–3).
3. Set the Mode Select key to Service mode.
4. Press the Eject button and remove the magazine, if present.
5. Pull the TZ877 subsystem out of the storage array and toward you by
placing your hand under the top of the TZ877 subsystem’s front bezel
(Figure A–4).
WARNING
If you pull the subsystem forward and the Power On indicator does not
turn off, do not attempt the head cleaning procedure.

6. Lift the loader open latch (Figure A–5) to the right of the unit.
7. Move the loader transfer assembly to the left, taking care not to hit the
storage array.
You now have access to the TK85 drive’s cartridge entrance (Figure A–2).

Head Cleaning Procedure A–5

Head Cleaning Procedure
A.1 Accessing the Drive
Figure A–4 Sliding the TZ877 Subsystem Toward You

SECOND
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106C_89

A–6 Head Cleaning Procedure

Head Cleaning Procedure
A.1 Accessing the Drive
Figure A–5 Loader Open Latch
LOADER OPEN LATCH

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

A.1.1 Loading the CleaningTape III Cartridge into the Drive
Be sure to use a CleaningTape III cartridge.
NOTE
If a loader fault exists, clear the fault before proceeding.

To load the CleaningTape III cartridge:
1. Pull the handle to the open position when the green Operate Handle
indicator lights steadily (Figure A–6).
2. Load the cartridge into the drive.
3. Push the handle closed. The green Operate Handle indicator turns off and
the yellow Tape in Use indicator begins to blink, indicating the tape is
loading.
When the cleaning process is finished, the green Operate Handle indicator
lights and the beeper sounds. Now you can unload the CleaningTape III
cartridge.

Head Cleaning Procedure A–7

Head Cleaning Procedure
A.1 Accessing the Drive
NOTE
If the Use Cleaning Tape indicator remains lit, the cleaning cycle
was not successful due to an expired cartridge. Replace the cleaning
cartridge and repeat the cleaning process.

A.1.2 Securing the TZ877 Magazine Tape Subsystem
After cleaning the head by inserting the cartridge directly into the drive, secure
the TZ877 subsystem as follows:
1. Close the loader transfer assembly.
2. Press the TZ877 loader open latch to secure the TZ877 subsystem
(Figure A–5).
3. Push the subsystem back into the storage array.
4. Be sure the Power On indicator is lit.
5. Set the Mode Select key to a position other than Service mode.

A–8 Head Cleaning Procedure

Head Cleaning Procedure
A.1 Accessing the Drive
Figure A–6 Loading the Cartridge

SHR-0256-87
SHR_X1093_89_CPG

A.2 Inserting the CleaningTape III Cartridge into the
Magazine
CAUTION
If you choose to use this cleaning procedure, you must return the
CompacTape III cartridges to their original slots, and remove the
cleaning cartridge from the magazine after the cleaning procedure is
done.

Head Cleaning Procedure A–9

Head Cleaning Procedure
A.2 Inserting the CleaningTape III Cartridge into the Magazine
To clean the read/write head by inserting the CleaningTape III into the
magazine rather than the drive, use the following steps (Figure A–3):
1. Press the Load/Unload button to remove any cartridges in the drive and
return them to the magazine.
2. Press the Eject button to open the receiver and remove the magazine.
3. Insert the CleaningTape III cartridge into the first slot of the magazine.
4. Insert the magazine into the receiver; close the receiver.
5. Press the Load/Unload button to load the cleaning cartridge into the drive.
Once the cleaning cartridge is loaded, the drive begins the head cleaning
procedure. When the cleaning procedure is complete, the cleaning cartridge
automatically returns to the magazine.
6. Press the Eject button to remove the magazine.
7. Remove the cleaning cartridge from the magazine and replace the
CompacTape III cartridge in the magazine.

A–10 Head Cleaning Procedure

B
TZ87 Removal and Replacement
Procedure
This appendix describes the removal and replacement procedure for the TZ87
subsystems from tabletop enclosures.

B.1 Preliminary Steps
To begin the removal and replacement procedure:
1. Use all ESD procedures
2. Disconnect power
3. Disconnect external cables from the rear of the panel

B.1.1 Removing the Enclosure Top
To remove the enclosure:
1. Remove the two screws at the rear of the enclosure.
2. Lift the rear of the enclosure and remove the top.

B.1.2 Removing the Fan
To remove the fan:
1. Disconnect the internal cables
2. Remove the four screws that secure the fan

B.1.3 Removing the SCSI ID Switch and Cable
To remove the SCSI ID switch and cable:
1. Disconnect the SCSI ID cable from the controller module.
2. Remove the two screws inside the rear panel that secure the SCSI ID
switch assembly to the panel.

TZ87 Removal and Replacement Procedure

B–1

TZ87 Removal and Replacement Procedure
B.1 Preliminary Steps

B.1.4 Removing the Internal SCSI Bus Cable
To remove the internal SCSI bus cable:
1. Disconnect the internal SCSI bus cable from the controller module.
2. Remove the four screws at the rear panel that secure the two SCSI bus
connectors.

B.1.5 Removing the Controller Module
To remove the controller module:
1. Disconnect the internal cables connected to the controller module.
2. Press the two metal locking tabs at the rear of the controller module to
release the module.

B.1.6 Removing the Power Supply
To remove the power supply:
1. Loosen the two captive screws securing the power supply.
2. Place the power supply outside the enclosure.
3. Disconnect the input power wires.
4. Release the input power wires from the power supply housing by squeezing
the grommet that secures the cables to one another.
5. Cut the tie-wraps to release the output power wires from the housing.

B.1.7 Removing the Drive
To remove the drive:
•

Remove the controller module (Section B.1.5).

•

Disconnect the power cable and the drive-to-controller cable from the drive.

•

Remove the two screws on the left that secure the drive bracket to the
enclosure floor.

•

Align the bracket keyholes with the screws and lift the drive/bracket
assembly from the enclosure.

•

Remove the bracket from the drive.

B–2 TZ87 Removal and Replacement Procedure

Index
A
Automatic mode, 2–16

B
BACKUP
Automatic mode, 2–16
Backup failures, 3–2
BREAK key operation, 5–2
Burn-in loopback mode, 5–1

C
Cartridge
loading, 2–6
Cartridge compatibility
read/write ability, 1–9
Cartridge motion faults, 3–8
isolating, 3–9
Cartridge recovery, 3–11
Cartridge removal, 2–8
Cleaning procedure for read/write head, A–7
CleaningTape III cartridge, A–1
inserting into magazine, A–9
loading into drive, A–7
Common failure influences, 3–4
Common failure modes/symptoms, 3–4
Communications interface, 1–7, 1–11
CompacTape cartridge
checking the tape leader, 3–2
inserting to magazine, 2–12
removing from magazine, 2–14
write-protect switch, 2–12

CompacTape III cartridge, 1–7
erasure, 1–8
Controller fault description, 3–7
Controller functions, 2–21
Controller initialization, 2–21
Controller module, 1–7, 1–11
Controller module removal, B–2

D
Data patterns, 5–3
Degaussing
CompacTape III cartridge, 1–8
Density, selecting
TZ877, 1–10
Diagnostics
overview, 5–1
Diagnostic server, 5–3
Diagnostic terminal server, 5–3
Disabling
OCP, 2–4
Door open sensor, 4–25
Drive errors
error conditions, 3–4
Drive fault description, 3–7
Drive removal, B–2
Drive rewind failure, 2–8
DSSI bus, 1–7, 1–11

Index–1

Eject button, 2–6
cartridge in drive, 2–10
no cartridge in drive, 2–10
unload function, 2–1
Enclosure removal, B–1
Erasure
CompacTape III cartridge, 1–8
Error indicators
loader faults, 3–6
magazine faults, 3–6

Indicators
all blinking, 3–5
green blinking, 3–5
yellow on, 3–5
Initialization, 2–17
loader transfer assembly, 2–21
subsystem, 2–18, 2–21
Internal SCSI bus cable removal, B–2

F
Fan
removal and replacement, 4–20
Fan removal, B–1
Fault description
loader, 3–7
magazine, 3–6
Fault matrix
FRU failures, 3–3
FRU
removal and replacement, 4–1
FRU failures
nondetectable, 3–3
FTST03 test, 5–4
FTST05 test, 5–5
FTST06 test, 5–5
FTST13 test, 5–5

G
Guidelines
for removing and replacing FRUs, 4–4

H
Handle motor assembly
removal and replacement, 4–24
Hardware components, 1–4
Head cleaning procedure, A–1
securing the subsystem, A–8

Index–2

L
Lastfail information, 5–2
Loader controller module, 1–4
Loader fault, 3–6
clearing, 3–8
description, 3–7
Loader open latch, A–7
Loader read all test, 5–6
Loader streaming write/read test, 5–6
Loader transfer assembly
elevator, mechanics, electronics, 1–4
removal and replacement, 4–9
Load/Unload button, 2–6
reset function, 2–1
LTST09 test, 5–6
LTST11 test, 5–6

M
Magazine, 1–5, 2–10
inserting cleaning tape, A–9
removal from receiver, 2–10
restoration into receiver, 2–14
Magazine fault, 3–6
clearing, 3–6, 3–7
description, 3–6
Magazine status, 3–6
Manually rewinding a tape, 2–8
Manual mode, 2–16
Mechanical stop
first, 4–5
second, 4–14

Mechanical stops, 2–17
Mode Select key, 2–16
Automatic mode, 2–16
Manual mode, 2–16
mode definitions, 2–16
OCP Disabled mode, 2–16
Service mode, 2–17
Mode select switch
removal and replacement, 4–26
Modes of operation, 1–1

Receiver, 2–10, 2–14
manually opening, 4–5
Recommended spares list, 4–2
Removal procedure
TZ87, B–1
Removing FRUs, 4–1
Replacing FRUs, 4–1
Reset
Load/Unload button, 2–1
Retry Algoritm, 5–6

OCP
operator control panel, 1–4
OCP Disabled mode, 2–16
Operating modes, 2–16
Operating procedures, 2–1
Operator control panel
removal and replacement, 4–19

SCSI bus, 1–7, 1–11
SCSI bus termination, 5–1
SCSI ID switch and cable removal, B–1
SCSI level 1 test, 5–6
SCSI level 2 test, 5–6
SCSI tests, 5–6
Securing the TZ877 subsystem, A–8
Service aids, 4–1, 4–4
Service features, 1–10
Service mode
unlocking the subsystem, 2–17
Shipping restraint, 4–4
Slot Select button, 2–6
operation, 2–6
Soft error rates, 3–4
Spares, 4–1
Specifications
TZ877 subsystem, 1–11
TZ87 tape drive, 1–13
Streaming read test, 5–5
Streaming write test, 5–5
Stream test, 5–6
Subsystem description, 1–1
Subsystem FRUs, 4–1

P
Positioning test, 5–4
POST
TZ87, 5–1
TZ87 tape drive, 2–22
POST terminal server, 5–2
Power-on self-test
POST, 2–17
TK85 tape drive, 2–22
Power problems, 3–8
Power supply assembly, 1–6
removal and replacement, 4–23
Power supply removal, B–2
Preliminary steps, B–1

R
Rear chassis, 1–6
controller module, 1–7, 1–11
fan, 1–7
handle motor assembly, 1–7
power supply assembly, 1–6

T
Takeup leader
removal and replacement, 4–18
Tape leader, in cartridge, 3–2

Index–3

TEST01 test, 5–6
TEST02 test, 5–6
TK85 tape drive
access for read/write head cleaning, A–5
cartridge entrance, A–5
Troubleshooting, 3–1
TX87 tape drive
POST, 2–22
TZ87
POST, 5–1

Index–4

TZ87 tape drive
removal and replacement, 4–12
TZ87 test descriptions, 5–3
TZX87 removal and replacement procedure,
B–1

W
Write-protect switch, 2–12
Write/read test, 5–5