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EK-OTA91-OM-001

April 1991

87 pages

Original

0.4MB

Document:	TA91 Owners Manual
Order Number:	EK-OTA91-OM
Revision:	001
Pages:	87
Original Filename:

OCR Text

TA91 Magnetic Tape Subsystem
Owner’s Manual
Order Number EK-OTA91-OM-001

Digital Equipment Corporation

First Edition, April 1991
The information in this document is subject to change without notice and should not be construed as a
commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for
any errors that may appear in this document.
Restricted Rights: Use, duplication, or disclosure by the U. S. Government is subject to restrictions as set
forth in subparagraph ( c ) ( 1 ) ( ii ) of the Rights in Technical Data and Computer Software clause at DFARS
252.227–7013.
Copyright © Digital Equipment Corporation 1991
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual generates, uses, and may emit radio frequency
energy. The equipment has been type tested and found to comply with the limits for a Class A computing
device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection
against such radio frequency interference when operated in a commercial environment. Operation of this
equipment in a residential area may cause interference, in which case the user at his own expense may be
required to take measures to correct the interference.
The following are trademarks of Digital Equipment Corporation: HSC, STI, TA90, TA91, VAX, VMS, TMSCP,
and the DIGITAL logo.
LEGAL NOTICE: TMSCP and STI protocols and documentation are the proprietary information of Digital
Equipment Corporation. UNIBUS/Q-BUS/BI-BUS port drivers and documentation for MSCP/TMSCP products
are also proprietary information of Digital Equipment Corporation.
Portions of this document contain material copyrighted by International Business Machines Corporation.
This document was prepared and published by Educational Services Development and Publishing, Digital
Equipment Corporation.

Contents
About This Manual
1

Introduction
1.1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1

1.2

TA91 Tape Control Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2

1.3
TA91 Tape Transport Units and Drives . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1
Operator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2
Cartridge Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2
1–3
1–4

1.4

1–5

Magnetic Tape Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operator Panels and Switch Panels
2.1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1

2.2
Tape Control Unit Operator Setup Panel . . . . . . . . . . . . . . . . . . . . . . .
2.2.1
Power On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2
Power On Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3
Unit Emergency Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4
A/B Fault Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.5
Normal/Test Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.6
TCU 0/TCU 1 Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.7
On Line Test/Off Line Test Switch . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.8
TCU Off Line Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.9
IML Pushbutton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.10 DC Power Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.11 Error Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.12 Wait Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.13 Disable Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.14 Remote/Local Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.15 Local Power Enable Pushbutton . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.16 TCU Address Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2
2–3
2–3
2–4
2–5
2–6
2–7
2–7
2–8
2–9
2–10
2–10
2–10
2–10
2–11
2–12
2–12

iii

iv Contents

2.3
Tape Drive Operator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.0.1
Ready Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.0.2
Ready Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.0.3
Unload Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.0.4
Rewind Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1
Tape Drive Message Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1.1
Attention Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1.2
Selected Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1.3
Display Panel Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1.4
Display Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1.5
Drive Condition Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1.6
Check Code Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–13
2–13
2–14
2–14
2–14
2–14
2–14
2–15
2–15
2–15
2–16
2–18

2.4
Cartridge Loader Operator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2
Mode Selection Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2.1
Auto Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2.2
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2.3
Changing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.3
Start Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–19
2–19
2–20
2–20
2–21
2–21
2–22

Operating Procedures
3.1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1

3.2

Loading the Microprogram into the Tape Control Unit . . . . . . . . . . . . .

3–1

3.3

Removing Power in an Emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2

3.4

Restoring Power After Emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3

3.5

Removing Power During Normal Operations . . . . . . . . . . . . . . . . . . . .

3–5

3.6

Restoring Power During Normal Operations . . . . . . . . . . . . . . . . . . . . .

3–7

3.7

Inserting Tape Cartridges and Starting Operations with the Cartridge
Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–8
Inspecting Tape Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
Setting the File-Protect Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9
Inserting Tape Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
Starting Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–12

3.7.1
3.7.2
3.7.3
3.7.4

3.8
Removing Tape Cartridges from the Cartridge Loader . . . . . . . . . . . . .
3.8.1
Removing a Single Tape Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.2
Removing Multiple Tape Cartridges . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.3
Unloading and Removing Tape Cartridges . . . . . . . . . . . . . . . . . . . .
3.8.4
Rewinding a Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–14
3–14
3–15
3–16
3–18

3.9
Using Auto/Manual Modes on the Cartridge Loader . . . . . . . . . . . . . . .
3.9.1
Using Auto Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.2
Using Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.2.1
Raising an Empty Output Tray in Manual Mode . . . . . . . . . . . . .

3–20
3–20
3–22
3–23

3.10

Cleaning Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–24

Contents v

3.10.1

Cleaning the Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–24

3.11

Cleaning a Tape Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–26

Care and Handling of the Magnetic Tape Cartridge
4.1

Cartridge Description and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1

4.2

Tape Media Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2

4.3

Unpacking and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–3

4.4

Cartridge Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–4

4.5

Stacking Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–4

4.6

Damaged Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–5

4.7
Tape Cartridge Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7.1
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7.2
Storage Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–5
4–5
4–6

4.8

Cartridge Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–6

4.9
Data Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.1
Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.2
Burning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.3
Shredding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–6
4–6
4–7
4–7

What to Do if You Have a Problem
5.1

You Can’t Insert a Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–1

5.2

Message Display is Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–2

5.3

IML Procedure Fails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–2

5.4

A Drive Does Not Become Ready . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–2

5.5

Tape Does Not Rewind or Unload . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–2

5.6

Tape Winds Completely Out of Cartridge . . . . . . . . . . . . . . . . . . . . . . .

5–2

5.7
Cartridge Loader Recovery Procedure . . . . . . . . . . . . . . . . . . . . . . . . . .
5.7.1
Attention Indicator is Flashing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.7.2
Attention Indicator is On Continuously (Not Flashing) . . . . . . . . . . .

5–3
5–3
5–3

5.8

You See a Message Code on the Message Display . . . . . . . . . . . . . . . . .

5–5

5.9

Leader Block Detaches from Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–6

5.10 There is a Check Code Message on the Message Display . . . . . . . . . . .
5.10.1 Check Code Recovery Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–7
5–7

5.11

5–7

You Want to Unload a Cartridge after a Power Failure . . . . . . . . . . . .

vi Contents

Standard VMS System Commands
A.1 VMS Commands Used with TA91 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.1
ALLOCATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.2
INITIALIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.3
MOUNT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.4
DISMOUNT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.5
BACKUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–1
A–1
A–2
A–2
A–2
A–3

A.2

Tape Drive Display Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–3

A.3

Backing Up on the TA91 with VMS . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–4

A.4

Data Compaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–4

Check Code Table

Index
Figures
1–1
1–2
1–3
1–4
1–5
1–6
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
2–10
2–11
2–12
2–13
2–14
2–15
2–16
2–17
2–18
2–19
2–20
3–1
3–2

TA91 Magnetic Tape Subsystem, Maximum Configuration . . . . . . . . . .
Tape Control Unit Operator Setup Panels . . . . . . . . . . . . . . . . . . . . . .
Operator Panel for Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Drive Message Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TA91 Cartridge Containing Magnetic Tape . . . . . . . . . . . . . . . . . . . . . .
Locations of Operator Panels and Switch Panels . . . . . . . . . . . . . . . . .
Emergency Power Off Switch Panel (Front Cover) . . . . . . . . . . . . . . . .
Power On/Off Switch and Power On Light . . . . . . . . . . . . . . . . . . . . . .
Unit Emergency Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/B Fault Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal/Test Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Line Test/Off Line Test Switch, TCU0/TCU1 Switch . . . . . . . . . . . .
TCU Off Line Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Microprogram Load (IML) Pushbutton . . . . . . . . . . . . . . . . . . . .
DC Power, Error, Wait, and Disable Lights . . . . . . . . . . . . . . . . . . . . . .
Remote/Local Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TCU Address Switches and Local Power Enable Pushbutton . . . . . . . .
Drive Operator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Drive Message Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying a Two-Part Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader Operator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader Mode Selection Switches . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader Start Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Emergency Power Switch on Front Cover . . . . . . . . . . . . . . . . . . .
Unit Emergency Power Switch on Rear Setup Panel . . . . . . . . . . . . . .

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

Contents vii

3–3
3–4
3–5
3–6
3–7
3–8
3–9
3–10
3–11
3–12
3–13
3–14
3–15
3–16
3–17
3–18
3–19
3–20
3–21
3–22
3–23
4–1
4–2
4–3
5–1

Restoring Power after an Emergency . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Power during Normal Operations . . . . . . . . . . . . . . . . . . . . .
Removing Power during Normal Operations . . . . . . . . . . . . . . . . . . . . .
Restoring Power during Normal Operations . . . . . . . . . . . . . . . . . . . . .
File-Protect Selector Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Cartridge (Loading Position) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Load Position) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Setting Switches) . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Messages) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Messages) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Remove Single Cartridge) . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Removing Multiple Cartridges) . . . . . . . . . . . . . . . .
Cartridge Loader Operator Panel Switches . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Messages) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switches Used for Rewinding a Tape . . . . . . . . . . . . . . . . . . . . . . . . . .
Rewinding Tape Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Auto Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Manual Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Loader (Manual Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the Cleaning Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Tape Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Cartridge Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cartridge Label Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
File-Protect Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3
3–5
3–6
3–7
3–9
3–10
3–11
3–12
3–13
3–13
3–14
3–15
3–16
3–17
3–18
3–19
3–20
3–22
3–23
3–24
3–25
4–1
4–2
4–4
5–5

Tables
2–1
5–1
A–1
B–1

Drive Condition Messages and Their Meanings . . . . . . . . . . . . . . . . . . 2–16
Problems? Quick Look Up Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
Tape Drive Display Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–3
Check Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1

About This Manual
This manual describes how to operate the TA91 Magnetic Tape Subsystem and is
intended for anyone responsible for operating the subsystem. It includes descriptions
of the operator’s panels and what to do if something goes wrong.
Familiarity with magnetic tape subsystem operation is helpful, but not necessary, when
attempting to operate the TA91 subsystem.
The material in this manual is presented in the following chapters:
•

Chapter 1, Introduction, describes the subsystem components.

•

Chapter 2, Operator Panels and Switch Panels, describes switches and lights on the
panels for the tape control unit, tape transport unit, and tape drive.

•

Chapter 3, Operating Procedures, describes how to operate the subsystem and how to
clean the drives and cartridges.

•

Chapter 4, Care and Handling of the Magnetic Tape Cartridge, describes how to
handle and care for the cartridges.

•

Chapter 5, What to Do if You Have a Problem, describes how to solve problems that
can occur.

1
Introduction

1.1 Overview
The TA91 Magnetic Tape Subsystem consists of a tape control unit (TCU) containing one
or two tape drives, and up to two tape transport units (TTUs) each containing two or four
tape drives. Each TA91 tape drive uses cartridge-enclosed magnetic tape.
The smallest TA91 subsystem consists of one tape control unit and one tape drive. The
largest TA91 subsystem, contains one tape control unit with two STI-FIPS adapters and
up to 8 tape drives (in any combination) with cartridge loaders.

SHR−XR0079−90

Figure 1–1

TA91 Magnetic Tape Subsystem, Maximum Configuration

1–1

1–2 Introduction

1.2 TA91 Tape Control Units
Each TA91 tape control unit contains the hardware for reading and writing data, data
error correction, data path control, and data buffering. It also contains microprocessors
that manage the data buffers, perform error recovery procedures, and control all tape
drive operations.
The tape control unit operator setup panels are located on the rear of the tape control
unit (Figure 1–2). The switches in these panels are set when the subsystem is installed,
and the settings are not changed during normal operations. The purpose of each switch
is important because some switches cause unpredictable results if they are moved while
the subsystem is processing work.

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal
Test

DC Power

TCU 0 On Line
Test
TCU 1 Off Line
Test

IML
Error

Wait

Local
Power Enable

Power

B
L

FAULT

Local
Remote

Unit
Emergency

FAULT

When in Local

SHR−XR0083−90

Figure 1–2

Tape Control Unit Operator Setup Panels

1.3 TA91 Tape Transport Units and Drives
The TA91 tape transport units contain compact, self-threading drives that use a magnetic
tape cartridge. Each tape transport unit contains two or four tape drives and the
mechanical and electrical assemblies necessary to support the drives. Each drive contains
a mechanical assembly for moving and threading the tape, electronic circuitry for reading
and writing, and a microprocessor that controls tape motion. There are no capstans or
vacuum columns.

Introduction 1–3

1.3.1 Operator Panel
Each drive has an operator panel that contains a message display and switches for
changing the ready/not ready condition of the drive and for rewinding and unloading tape
cartridges.

Drive

Ready

Unload

Rewind

SHR−XR0051−90

Figure 1–3

Operator Panel for Drive

The message display can show drive condition, drive error information, and messages
sent by an attached controlling computer. You can adjust the operator panel to best meet
your viewing requirements.
R EADYU
d i g i t a l

SHR−XR0052−90

Figure 1–4

Tape Drive Message Display

1–4 Introduction

1.3.2 Cartridge Loader
The cartridge loader is an integral part of each TA91 tape drive. The loader allows both
the automatic loading of prestaged tape cartridges, and the manual loading of single tape
cartridges Figure 1–5.
The loader operator panel on the front of the loader allows the operator to switch between
Auto and Manual modes. It also has a Start switch for initiating loader activity and two
indicator lights. The Power light indicates that the correct voltages are present on the
loader, and the Attention light indicates when an operator action is required or when an
error is encountered.
Autoloader

Auto

System

Manual

Start

Power

SHR−XR0053−90

Figure 1–5

Cartridge Loader and Panel

Introduction 1–5

1.4 Magnetic Tape Cartridge
The cartridge is closed by a leader block (attached to the end of the tape) to protect the
tape from contamination when it is out of the drive (Figure 1–6). When the cartridge is
inserted in a drive, the threading mechanism uses the leader block to pull the tape out of
the cartridge, across the read/write head, and onto a nonremovable machine reel.
CAUTION
Do not try to pull the leader block away from the cartridge. You could damage
the tape and reduce the reliability of the cartridge.
Each tape cartridge includes a File-Protect selector that, when set to the file-protect
position, prevents data from being written on or erased from the tape. See Section 3.7.2,
Setting the File-Protect Selector.
The tape cartridge has a volume/serial number label on its side (Figure 1–6). A larger
customer information label can be mounted on the top of the cartridge.
LABELS

LEADER
BLOCK

FILE−PROTECT
SELECTOR

SHR−XR0054−90

Figure 1–6

TA91 Cartridge Containing Magnetic Tape

2
Operator Panels and Switch Panels

2.1 Overview
Each tape control unit has two operator panels; a setup panel and an A/B Fault switch
panel. Each drive has an operator panel for the drive and an operator panel for the
cartridge loader. Although the switches in each panel are not changed during normal
operations, they can be manually operated for some conditions (Figure 2–1).
Drive

Autoloader
Ready
Auto
Unload
System
Rewind
Manual

Tape Drive
Operator Panel

Start

Power

Cartridge Loader
Panel

Cleaning Cartridge

Tape Control Unit Setup Panel

Emergency Power Off
Switch Panel

SHR−XR0079A−90

Figure 2–1

Locations of Operator Panels and Switch Panels

2–1

2–2 Operator Panels and Switch Panels

There are two tape control unit Emergency Power Off switch panels; one is located on
the front cover of the tape control unit, and the other is located in the rear on the tape
control unit setup panel.
Unit
Emergency
Power Enable
Power Off

Cleaning Cartridge

SHR−XR0080−90

Figure 2–2

Emergency Power Off Switch Panel (Front Cover)

Do not move this switch during normal operations. If the Power On/Off switch is
moved accidentally while the tape control unit is operating, the effect on the jobs that
are running is unpredictable, and can include data integrity problems, job termination,
and so on. If power is lost, see Section 3.4, Restoring Power After Emergency, to restore
the power and load the microprogram. Tell the system operator or supervisor about the
power loss.
The Unit Emergency Power switch is used to remove power in emergencies, such as
water getting into the tape control unit or any of the drives. When this switch is moved
to the Power Off position, power is immediately removed from the subsystem.

2.2 Tape Control Unit Operator Setup Panel
The tape control unit operator setup panel has switches and lights that control the
subsystem and its relationship to the controlling computer. Although most of the switches
and lights on the panel are hidden, the A/B Fault switches, the Power On/Off switch, and
the Unit Emergency Power switch are all accessible through an opening in the rear cover
of the tape control unit.
The switches and lights that are part of the tape control unit setup panel on the rear of
the tape control unit can be used to:
•

Switch the tape control unit from normal operation to test operation.

•

Switch a tape control unit off-line or on-line.

•

Reset the tape control unit after a unit emergency power-off.

•

Change the tape control unit addresses.

Operator Panels and Switch Panels 2–3

2.2.1 Power On/Off Switch
Do not move this switch during normal operations. If the Power On/Off switch is
moved accidentally while the tape control unit is operating, the effect on the jobs that
are running is unpredictable, and can include data integrity problems, job termination,
and so on. If power is lost, see Section 3.6, Restoring Power During Normal Operations,
to restore the power and load the microprogram. Tell the system operator or supervisor
about the power loss.
The Power On/Off switch 1 supplies or removes power to the tape control unit and its
attached tape transport units (Figure 2–3).
When the Remote/Local switch is in the Remote position, power is controlled by the
controlling computer or a switching device.

2.2.2 Power On Light
The green Power On light 2 comes on when power is supplied to the subsystem
(Figure 2–3).
1

Power

B
L

FAULT

Unit
Emergency

FAULT

When in Local

SHR−XR0098−90

Figure 2–3

Power On/Off Switch and Power On Light

2–4 Operator Panels and Switch Panels

2.2.3 Unit Emergency Power Switch
Do not move this switch during normal operations. If the Unit Emergency Power
switch is moved accidentally while the tape control unit is operating, the effect on
the jobs that are running is unpredictable, and can include data integrity problems,
job termination, and so on. If power is lost, see Section 3.4, Restoring Power After
Emergency, to restore the power and load the microprogram. Tell the system operator or
supervisor about the power loss.
The Unit Emergency Power switch 3 removes power in emergencies (Figure 2–4).
Emergencies include smoke coming from the tape control unit or water getting into
the tape control unit or any of the drives. When this switch is moved to the Power Off
position, power is immediately removed from the subsystem.
1

Power

B
L

FAULT

B
R

Unit
Emergency

FAULT

When in Local

SHR−XR0099−90

Figure 2–4

Unit Emergency Power Switch

Operator Panels and Switch Panels 2–5

2.2.4 A/B Fault Switches
Do not move these switches during normal operations. If a switch is moved
accidentally while the tape control unit is operating, the effect on the jobs that are
running is unpredictable, and can include data integrity problems, job termination, and
so on. If power is lost, see Section 3.6, Restoring Power During Normal Operations, to
restore the power and load the microprogram. Tell the system operator or supervisor
about the power loss.
The A/B switches 4 determine which ports can be accessed by an HSC controller. The
Fault switches are used to read error codes and reset error conditions.
1

Power

FAULT

B
R

Unit
Emergency

FAULT

When in Local

SHR−XR0100−90

Figure 2–5

A/B Fault Switches

2–6 Operator Panels and Switch Panels

2.2.5 Normal/Test Switch
Do not move this switch during normal operations. If the Normal/Test switch is
moved accidentally while the tape control unit is operating, the effect on the jobs that
are running is unpredictable, and can include data integrity problems, job termination,
and so on. If the switch is moved, return it to the Normal position and tell the system
operator or supervisor about the accident.
The Normal/Test switch 1 controls the tape control unit mode of operation (Figure 2–6).
When the switch is in the Normal position, the tape control unit is set for normal
operation. When the switch is in the Test position, the tape control unit is set for testing.
The tests are maintenance aids used by service representatives.
1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal
Test

TCU 0 On Line
Test

Error

Wait

Local
Power Enable

Local
Remote

TCU 1 Off Line
Test

Figure 2–6

DC Power
IML

Normal/Test Switch

SHR−XR0101−90

Operator Panels and Switch Panels 2–7

2.2.6 TCU 0/TCU 1 Switch
The TCU 0/TCU 1 switch 2 identifies the tape control unit (Figure 2–7). This switch is
set to TCU 0 at installation and should not be changed after the subsystem is installed.

2.2.7 On Line Test/Off Line Test Switch
Do not move this switch during normal operations. If the switch is moved
accidentally while the tape control unit is operating, the effect on jobs that are running
is unpredictable, and can include data integrity problems, job termination, and so on. If
one switch is moved, return the switch to the On Line Test position and tell the system
operator or supervisor about the accident.
The position of the On Line Test/Off Line Test switch 3 determines whether the tape
control unit can communicate with the controlling computer (Figure 2–7).
When the switch is in the On Line Test position, the tape control unit can communicate
with the controlling computer. When the switch is in the Off Line Test position, the tape
control unit cannot communicate with the controlling computer.
When the On line Test/Off line Test switch is moved to the Off Line Test position during
normal operations, the tape control unit completes processing of all the work in the
subsystem and returns subsystem status to the controlling computer. This process can
take up to five minutes before the subsystem becomes off-line. The TCU Off Line light 4
comes on to show when the tape control unit is off-line.
For normal operation, the switch should be in the On Line Test position.
1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power
IML
Error

Wait

Local
Power Enable

Local
Remote

SHR−XR0102−90

Figure 2–7

On Line Test/Off Line Test Switch, TCU0/TCU1 Switch

2–8 Operator Panels and Switch Panels

2.2.8 TCU Off Line Light
The green TCU Off Line light 5 comes on when the On Line Test/Off Line Test switch is
set to Off Line Test, all subsystem processing has completed, and subsystem status has
been to the controlling computer (Figure 2–8).
NOTE
There can be a short delay (up to five minutes) between when the On Line
Test/Off Line Test switch is placed in the Off Line Test position and when the
TCU Off Line light comes on.
The TCU Off Line light is off and the subsystem is on-line when data is being transferred
between the subsystem and a controlling computer.
When the TCU Off Line light is off, do not switch the power off.
1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power
IML
Error

Figure 2–8

TCU Off Line Light

Wait

Local
Power Enable

Local
Remote

SHR−X0103−90

Operator Panels and Switch Panels 2–9

2.2.9 IML Pushbutton
CAUTION
If this pushbutton is accidentally moved during subsystem operation, and the
On Line Test/Off Line Test switch is in the Off Line Test position, all the data in
the buffer is destroyed. If this happens, tell the system operator or supervisor
about the accident.
The IML pushbutton 6 resets internal controls in the tape control unit (Figure 2–9).
Pressing this pushbutton causes all information that was supplied by any controlling
computer to the tape control unit to be erased, including buffered data. Generally, this
pushbutton is not used during normal operations. The IML pushbutton will not function
unless the tape control unit On Line Test/Off Line Test switch is set to Off Line Test.
After setting the switch to the Off Line Test position, wait for the Off Line Test light to
come on before pressing the IML pushbutton.
When the pushbutton is pressed, the tape control unit begins the initial microprogram
load (IML) procedure. See Section 3.2, Loading the Microprogram into the Tape Control
Unit, for more information about the IML procedure.
1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power
IML
Error

Wait

Figure 2–9

Initial Microprogram Load (IML) Pushbutton

Local
Power Enable

Local
Remote

SHR−X0104−90

2–10 Operator Panels and Switch Panels

2.2.10 DC Power Light
The tape control unit DC Power light 7 is on when dc power is supplied to the tape
control unit (Figure 2–10).

2.2.11 Error Light
The Error light 8 comes on when an error has been detected (Figure 2–10). If the light
is blinking, the error was detected by the microprogram but does not affect tape control
unit integrity. If the light is constantly on, the error was detected by the hardware, and
the tape control unit is disabled.

2.2.12 Wait Light
The Wait light 9 blinks while the subsystem is operating (Figure 2–10). When the
subsystem is waiting for work, the light is constantly on. When the light is constantly
off, the subsystem has had an error.

2.2.13 Disable Lights
The Disable light 10 for each STI-FIPS interface either blinks or stays on during powerup and turns off after a normal power-up (Figure 2–10). If the light is on after normal
power-up, subsystem communication on the corresponding interface is prevented.
An error in communication between the controlling computer and the tape subsystem
cause the interface to be disabled and the Disable light to come on.
1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Figure 2–10

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power

Local
Power Enable

IML
Error

Wait

DC Power, Error, Wait, and Disable Lights

Local
Remote

SHR−XR0105−90

Operator Panels and Switch Panels 2–11

2.2.14 Remote/Local Switch

CAUTION
Do not move this switch during normal operations in a subsystem that does not
have an emergency power off (EPO) connection to the controlling computer. If
the switch is moved accidentally while the tape control unit is operating, the
effect on jobs that are running is unpredictable, and can include data integrity
problems, job termination, and so on. Tell the system operator or supervisor
about the accident.
The Remote/Local switch 11 determines what part of the system controls power to the
subsystem (Figure 2–11). The Remote position is not supported in the TA91. When the
switch is in the Local position, the tape control unit controls the power to the subsystem.
The effect of moving the switch accidentally while the tape control unit is operating
depends on whether the subsystem has an emergency power off (EPO) connection to
the controlling computer. See the Caution above for a subsystem that does not have an
EPO connection. In a subsystem that does have an EPO connection to the controlling
computer, moving this switch accidentally while the tape control unit is operating does
not affect the jobs that are running. Return the switch to its original position.
11

1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power
IML
Error

Wait

Local
Power Enable

Local
Remote

SHR−XR0106−90

Figure 2–11

Remote/Local Switch

2–12 Operator Panels and Switch Panels

2.2.15 Local Power Enable Pushbutton
The Local Power Enable pushbutton 12 resets the ac power supply to permit power to be
applied to the tape control unit (Figure 2–12). The Unit Emergency Power switch must
be in the Power Enable position.
If the switch is moved accidentally while the tape control unit is operating, the jobs that
are running are not affected. No operator action is required.

2.2.16 TCU Address Switches
If one of these switches is moved accidentally while the tape control unit is operating,
the jobs that are running are not affected (Figure 2–12). However, do not leave
the switch in the incorrect position. Return the switch to the original position as
indicated by the label. If the switch is not returned to the original position, unpredictable
results could occur.
The TCU address switches 13 are set according to the tape control unit addresses. These
switches were set for TCU0 when the subsystem was installed and usually are not
changed.
13

1
L

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power
IML
Error

Wait

Local
Power Enable

Figure 2–12

TCU Address Switches and Local Power Enable Pushbutton

Local
Remote

SHR−XR0107−90

Operator Panels and Switch Panels 2–13

2.3 Tape Drive Operator Panel
Each tape drive in the subsystem contains an operator panel and display, and each tape
transport unit has a display (see Figure 2–14). The panel has switches and lights that
can be used to:
•

Rewind tape.

•

Unload tape.

•

Place the drive in a Ready or Not Ready condition.

Drive

Ready
3

Unload
4

Rewind

SHR−XR0108−90

Figure 2–13

Drive Operator Panel

2.3.0.1 Ready Switch
Do not move this switch during normal operations. If the switch is moved
accidentally while the drive is operating, the effect on the job that is running on this
drive is unpredictable, and can include data integrity problems, job termination, and so
on. Move the switch back to the Ready position and tell the system operator or supervisor
about the accident.
The Ready switch 1 places the drive in a ready or not ready condition. When the switch
is in the ready position, the ready light is on and the drive is prepared to read data from,
or write data to, a magnetic tape. When the switch is in the not ready position, the ready
light is off and the drive cannot read or write data. This switch must be in the not ready
position for the Rewind switch or the Unload switch to work, unless a check condition
has already caused the drive to lose its ready condition.

2–14 Operator Panels and Switch Panels

2.3.0.2 Ready Light
The green ready 2 light is on when the drive is in a ready condition. When a cartridge
is loaded, the drive goes into a ready state indicated by a READY message on the drive
display.
2.3.0.3 Unload Switch
The Unload switch 3 rewinds the tape completely into the cartridge and releases the
leader block. The cartridge is ejected into the cartridge loader when the unload operation
completes. You can then remove the cartridge from the drive. The Unload switch works
only when the Ready light is off, or if a check condition has caused the drive to lose its
ready condition.
Pressing the Unload switch resets the drive and resets any check code messages on the
message display. The Unload switch is sometimes used in error recovery procedures for
the cartridge loader.
If the switch is moved accidentally while the drive is ready, there is no effect. However, if
the drive is not ready, the drive rewinds and unloads the tape.
2.3.0.4 Rewind Switch
The Rewind switch 4 rewinds the tape into the cartridge to the beginning-of-tape (BOT).
The Rewind switch works only when the Ready light is off.
If the switch is moved accidentally while the drive is ready, there is no effect. However, if
the drive is not ready, the drive rewinds the tape.

2.3.1 Tape Drive Message Display
The message display allows you to view messages that inform you of drive condition or
required actions. Each message display unit has four 8-digit displays, one for each of the
tape drives. The top two 8-digit displays are for the top two drives and the bottom two
8-digit displays are for the bottom two drives.
R EADYU
1

d i g i t a l

2
SHR−XR0109−90

Figure 2–14

Tape Drive Message Display

2.3.1.1 Attention Light
The yellow attention light 1 is on when action is required to permit operations on
the drive. The message display indicates the required action. If the Attention light
is off, no action is required, even though a message is displayed. For example, if an
E.O.T. message is displayed, the attention light will be off, indicating the message is for
information only.

Operator Panels and Switch Panels 2–15

2.3.1.2 Selected Light
The green selected light 2 is on when the tape control unit is communicating with the
drive.
2.3.1.3 Display Panel Adjustments
The display uses 25 mm (1 inch) high characters and has a wide range of independent
adjustments:
•

175 ° of left-right rotation

•

45 ° of tilt angle

•

29 cm (11.5 inches) of vertical movement.

You cannot, however, turn the panel completely around to view it from the rear of the
tape transport unit. Detents hold the panel steady at any of its positions. You can stop
the panel between the detents, but it is not held firmly in position.
To rotate the panel:
Firmly grasp each end of the panel
1. Apply enough left or right pressure to overcome the detent
2. Move the panel until it stops at a detent in the desired position
To tilt the panel:
1. Firmly grasp each end of the panel
2. Apply enough forward or backward pressure to overcome the detent
3. Move the panel until it stops at a detent in the desired position
To raise or lower the panel:
1. Firmly grasp each end of the panel
2. Apply up- or down-ward pressure to overcome the friction in the pivot arms
3. Move the panel until it is in the desired position
2.3.1.4 Display Messages
The message display shows messages that indicate drive condition. Four messages can
be displayed:
•

Mount and dismount

•

Drive condition

•

Check code

•

Subsystem information

The message display has eight character positions (Figure 2–15).

2–16 Operator Panels and Switch Panels

R EADYU
d i g i t a l

SHR−XR0052−90

Figure 2–15

Message Display

The eighth (last) position sometimes modifies the specified operator action or gives
additional information. For example, an F displays when the cartridge is fileprotected. Displayed messages can extend across all eight character positions, for
example: UNLOADING. In addition, two-part messages display each part alternately
(Figure 2–15). For example, the two-part message D XXXXXX and M XXXXXX is
displayed as D XXXXXX then M XXXXXX, D XXXXXX then M XXXXXX.

d i g i t a l

X X X XX X

d i g i t a l

X X X XX X

SHR−XR0085−90

Figure 2–16

Displaying a Two-Part Message

2.3.1.5 Drive Condition Messages
With any operating system, a drive condition message appears on the message display
when the drive condition changes. The following table shows the drive condition
messages and their meanings.
Table 2–1 Drive Condition Messages and Their Meanings
Message

State

Explanation

READY

(steady)

This message appears when a drive has tape motion. The U means
that the tape is unprotected (not file protected). An F in the last
display position means the tape is file protected.

Operator Panels and Switch Panels 2–17

Table 2–1 (Cont.) Drive Condition Messages and Their Meanings
Message

State

Explanation

REWINDING (steady)

A tape is being rewound

UNLOADING (steady)

A tape is being unloaded. The load process is complete when the
cartridge is ejected to the loader.

DR #

(steady)

After successful IML, all drives show their drive numbers (see
Note).

(steady)

The cartridge has been removed by the operator. The drive is empty.

(steady)

The tape is not ready (for example, the Ready light is off). The
letter U or F in the last display position indicates the file protection
setting.

NT RDY
U

The NT RDY message can be either hardware or software generated. The hardwaregenerated NT RDY does not blink. It displays whenever the device is not ready and has
no outstanding I/O request. The software-generated NT RDY blinks whenever an I/O
request is issued and the device is found not ready.
NOTE
An asterisk (*) may display when power is restored after a power failure. If
a cartridge is still in a drive when the IML procedure completes, an asterisk
displays and the cartridge unloads.

2–18 Operator Panels and Switch Panels

2.3.1.6 Check Code Messages
A check code message appears on the message display when a hardware error is detected
in the drive (Figure 2–17). This message has priority over the other kinds of messages
and is not replaced by any other message until the error is corrected. The
customer engineer uses the check code to identify the cause of the error. The check code
message has the following format on the message display:
( )CHK XY ( )
The first and last characters are special symbols and XY is the hexadecimal error code.
Please note that if a CHK XY message displays, the special symbols do not mean that the
drive is off line.
When a check code message displays, see Appendix B, Check Code Table. If service is
required, record the check code and give it to the customer engineer.
R EADYU

d i g i t a l

C H K

X Y

SHR−XR0086−90

Figure 2–17

Displaying Check Codes

Operator Panels and Switch Panels 2–19

2.4 Cartridge Loader Operator Panel
This panel has switches and indicators to control and monitor the cartridge loader
(Figure 2–18).

Autoloader

Auto
2

System

Manual

1
Start

Power
SHR−XR0110−90

Figure 2–18

Cartridge Loader Operator Panel

2.4.1 Indicators
There are several indicator lights on the loader operator panel:
•

The green indicator 1 is the power indicator. This is on when the voltages required
by the cartridge loader are present.

•

The yellow attention indicator 2 has two functions.

•

–

When the indicator is flashing, the input stack is empty, the output stack is full,
or some other operator service is required. See Section 5.7, Cartridge Loader
Recovery Procedure.

–

When the indicator is on continuously (not flashing), an error has been detected
by the loader, and operator intervention is required to attempt recovery. See
Section 5.7, Cartridge Loader Recovery Procedure for additional information.

The other indicators are used to show which mode of operation has been selected.

2–20 Operator Panels and Switch Panels

2.4.2 Mode Selection Switches
These switches control the mode in which the cartridge loader operates. The two modes
are Auto 3 and Manual 4 .
Auto and manual modes run on any operating system that supports the TA91 subsystem.
System mode is not currently supported although a System mode switch exists.

Autoloader

Auto
3
System

Manual
4
Start

Power

SHR−XR0111−90

Figure 2–19

Cartridge Loader Mode Selection Switches

2.4.2.1 Auto Mode
The following is a general description of Auto mode. For step-by-step procedures on how
to use Auto mode, see Section 3.9.1, Using Auto Mode.
Auto mode allows an operator to prestage up to six cartridges, which are automatically
loaded as the preceding cartridge is unloaded (Figure 2–19).
Auto mode is most effective for:
•

Loading only one cartridge at a time, when the operator wants the cartridge
automatically indexed (moved) to the output stack. This frees the drive for the
input of the next cartridge, and allows the operator to remove the processed cartridge
when it is convenient, or when the output stack is full (six cartridges).

•

Prestaging scratch cartridges when it is known that only scratch cartridges are going
to be requested by the system.

•

Prestaging cartridges for applications when multiple cartridges are required and the
operator knows which cartridges are required and in what order.

Operator Panels and Switch Panels 2–21

2.4.2.2 Manual Mode
The following is a general description of Manual mode. For step-by-step procedures on
how to use Manual mode, see Section 3.9.2, Using Manual Mode.
Manual mode allows the manual insertion and removal of tape cartridges (Figure 2–19).
Manual mode is most effective:
•

When you want the loader to function like a TA91 tape drive without the loader
feature.

•

When you want to hold premounted cartridges in the input stack until the job that
requires them is run. The Start switch must be pressed to start loader operation.

•

When you want to stop the cartridge feeding and loading in auto mode. Any function
in progress is completed before the loader switches to Manual mode. For example,
if a cartridge was being processed on the drive, it would continue to process until
finished, then unload to the feed position.

•

When you want to permit continued use of a drive if the indexing function of the
loader fails.

•

When you want to raise and maintain an empty output stack to allow maintenance
on the adjacent drive. Some maintenance procedures require that the output stack be
in the fully raised (unloaded) position. Manual mode does not use the output stack,
allowing continued use of the drive.

•

When using those applications that require only one cartridge.

2.4.2.3 Changing Modes
Modes can be changed at any time. If a function is in progress at the time, it will
complete before the loader switches to the new mode. For example, if a cartridge was
being processed on the drive, it would process until finished, then unload.
After using the mode selection switch to change modes, the operator must press the Start
switch to restart loader operations. However, any operator actions (such as inserting
cartridges) should be performed before pressing the Start switch.
If a cartridge unloads to the feed position in Manual mode, and then you change modes,
the loader will recognize that the cartridge in the feed position has been processed. If
you remove the processed cartridge from the feed position, and reinsert or replace it with
another cartridge, the loader recognizes it as a new cartridge.
If you switch from Auto mode to Manual mode while a cartridge is loaded, that cartridge
unloads to the feed position when it is through processing, and must be removed
manually.

2–22 Operator Panels and Switch Panels

2.4.3 Start Switch
Press the Start switch 5 to cause an index and/or load procedure to occur or, under error
conditions, an unload procedure to occur (Figure 2–20).
Press the Start switch for the following conditions:
•

After changing the mode selection switch between Auto or Manual to start activity in
the new mode

•

To restart activity after some required operator action has been performed

•

To allow recovery actions to continue after a problem
— Pressing the Start switch allows recovery actions to continue after cartridges
have been manually removed from the feed position or output stack in response
to a problem.
— After a subsystem IML or after a load request to the TA91 tape control unit, a
cartridge may be unloaded to the output stack with the output tray 6 remaining
up. Pressing the Start switch allows the cartridge to be removed from the loader.

The Start switch is ignored if it is pressed when not required.

Autoloader

Auto

System

Manual
6

Start
5
Power

SHR−XR0112−90

Figure 2–20

Cartridge Loader Start Switch

3
Operating Procedures

3.1 Overview
Operating the TA91 subsystem requires several procedures. These include:
•

Loading the microprogram into the tape control unit

•

Removing and restoring power to the subsystem

•

Setting the File-Protect selector on a cartridge

•

Loading and unloading a tape cartridge

•

Rewinding loosely wound tape

•

Loading and unloading tape cartridges on drives with the cartridge loader

3.2 Loading the Microprogram into the Tape Control Unit
The subsystem microprogram must be loaded into each tape control unit whenever power
is turned on, or if an error occurs that disrupts the microprogram.
The microprogram is contained on a 3½ inch diskette that is inserted into the diskette
reader. The customer engineer puts the diskette into the reader when the subsystem is
installed. Generally, the diskette remains in the reader at all times.
The tape control unit starts the procedure for loading the microprogram, called initial
microprogram load (IML), when power is turned on at the tape control unit. When the
IML starts, the light on the diskette reader comes on and the Wait light starts blinking.
If the IML completes successfully, the light on the diskette reader goes off, and the Wait
light stays constantly on. However, if the IML does not complete successfully, the diskette
reader light goes off and the Error light comes on.
If the diskette is not inserted in the diskette reader when power is turned on at the tape
control unit, the IML cannot start automatically.
While the IML procedure is running, the light on the front of the diskette reader is on
and the Wait light is blinking. When the IML procedure completes successfully, the
diskette reader light goes off, the Wait light stays constantly on, and the Disable lights
go out. If one of the Disable lights fails to go out, refer to Section 5.3 for instructions.
If an error occurs that prevents the microprogram from loading successfully, the Error
light comes on instead of the Wait light. If the IML procedure is not successful, refer to
Section 5.3 for instructions.
For normal tape control unit operations following the IML, the TCU On Line Test/Off
Line Test switch should be in the On Line Test position.

3–1

3–2 Operating Procedures

3.3 Removing Power in an Emergency
Use the Unit Emergency Power switch on the tape control unit front cover or on the rear
setup panel to remove subsystem power in emergencies, such as smoke coming from the
unit, or liquids spilling into the tape control unit or any of the drives.
NOTE
Do not use the Unit Emergency power switch during normal operations.
If an emergency occurs, move either of the Unit Emergency Power switches to the
Power Off position on the tape control unit.
Power is immediately removed from the subsystem.
Unit
Emergency
Power Enable
Power Off

Cleaning Cartridge

SHR−XR0080−90

Figure 3–1

Unit Emergency Power Switch on Front Cover
1
2

Power

B
L

FAULT

B
R

Unit
Emergency

FAULT

When in Local

SHR−XR0113−90

Figure 3–2

Unit Emergency Power Switch on Rear Setup Panel

Operating Procedures 3–3

3.4 Restoring Power After Emergency
After you use the Unit Emergency Power switch on either the front panel or the tape
control unit setup panel to remove power from the subsystem, you must press the Local
Power Enable pushbutton on the tape control unit setup panel before power can be
restored to the subsystem.
1. Place the TCU On Line Test/Off Line Test switch 3 in the On Line Test position.
1

Unit
Emergency

Power Enable
Power Off

1
Power

Unit
Emergency

Cleaning Cartridge
When in Local

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

DC Power

Local
Power Enable

IML
Error

Wait

Local
Remote

SHR−XR0114−90

Figure 3–3

Restoring Power after an Emergency

2. Move either of the tape control unit’s Unit Emergency Power switches 1 or 2 to the
Power enable position.
3. Press the Local Power Enable pushbutton 4 on the tape control unit operator setup
panel.
The IML procedure starts automatically if the IML diskette is inserted into the diskette
reader. If the diskette was removed from the diskette reader, see Section 3.2 for
instructions to start the IML procedure.
NOTE:
Before proceeding, verify that the Wait light is on, otherwise, an error may
occur.

3–4 Operating Procedures

4. Press the Tape Drive operator panel Unload switches to remove all tape cartridges
that were inserted in drives when the power went off.
5. Move the TCU On Line Test/Off Line Test switch 3 to the TCU On Line test position.

Operating Procedures 3–5

3.5 Removing Power During Normal Operations
To remove power from the subsystem:
1. Have all users dismount their tapes.
2. Place the tape control unit TCU On Line Test/Off Line Test switch 3 in the Off Line
test position.
9

TCU Address/Type
If TCU 0, Set to: 0D
If TCU 1, Set to: 1C

Disable

Normal

TCU 0 On Line
Test

Test

TCU 1 Off Line
Test

IML

DCDrive
Power
Error

Local
Power Enable

Wait

Local
Remote

5
7

Ready
6

Unload
8

Rewind
SHR−XR0115−90

Figure 3–4

Removing Power during Normal Operations

3. Wait for the TCU Off Line Test light 5 to come on.
Generally, the TCU Off Line Test light comes on within five seconds. However, if a
job is running that consists of many read or write commands, the TCU Off Line Test
light might not come on for up to five minutes.
If the TCU Off Line Test light did not come on within five minutes, the activity may
be caused by something outside of the subsystem’s control. Stop trying to get the tape
control unit off-line and notify your system operator or supervisor.
4. Rewind and unload all the cartridges currently loaded in drives attached to the tape
control unit.

3–6 Operating Procedures

a. Set the Ready switches 6 on all drives to their not ready states and wait for the
ready light(s) 7 to go off.

Power

B
L

FAULT

B
R

Unit
Emergency

FAULT

When in Local

SHR−XR0081−90

Figure 3–5

Removing Power during Normal Operations

b. Press the Unload switches 8 . Wait for all cartridges to be unloaded.
5. If the Remote/Local switch 9 on the tape control unit operator setup panel is in the
Remote position, move the switch to the Local position and continue with the next
step.
6. On the tape control unit A/B Fault panel, place the Power On/Off switch in the Off
position.
The Power On light goes off immediately.

Operating Procedures 3–7

3.6 Restoring Power During Normal Operations
1. On the tape control unit setup panel, make sure that the TCU On Line Test/Off Line
Test switch is in the On Line Test position.
2. Place the Power On/Off switch in the On position 10 .
11

Power

B
L

FAULT

Unit
Emergency

FAULT

When in Local

SHR−XR0116−90

Figure 3–6

Restoring Power during Normal Operations

3. The Power On light 11 comes on when power is restored.
If the IML diskette is in place in the diskette reader, the IML procedure starts
automatically. If the IML diskette is not in place when power is restored, refer to Loading
the Microprogram into the Tape Control Unit in this chapter for instructions.
•

If you usually operate with the Remote/Local switch on the tape control unit
operator setup panel in the Remote position, place the switch in the Remote
position now and resume operation.

•

If you usually operate with the switch in the Local position, you may immediately
resume operation.

3–8 Operating Procedures

3.7 Inserting Tape Cartridges and Starting Operations with the
Cartridge Loader
The procedure for inserting tape cartridges and starting operations on the loader is
divided into four sections:
1. Inspecting tape cartridges
2. Setting the file-protect selector
3. Inserting tape cartridges
4. Starting operations
Perform the following procedure before you begin inserting tape cartridges in the
automatic cartridge loader.

3.7.1 Inspecting Tape Cartridges
1. Inspect the cartridge for damage before inserting it in the drive.
A damaged cartridge may not permit the tape to be threaded correctly and
could cause damage to the drive.
A cartridge should be taken out of service if:
•

The tape was wound completely out of the cartridge onto the machine reel and
was then reattached to the cartridge reel by the service representative. This
repair is temporary and permits the cartridge to be loaded one time so that the
data can be copied to a replacement cartridge.

•

The cartridge case is cracked or broken.

•

The leader block is broken.

•

The leader block latch is broken.

•

The File-Protect selector is damaged.

•

The cartridge case contains any liquid.

•

The cartridge has any other obvious damage.

2. If you have a damaged cartridge, substitute a back-up version of the data from
another cartridge.
3. If the cartridge has a detached leader block but no other damage, you can repair the
cartridge by using the materials in the Leader Block Repair kit. See Leader Block
Detaches from Tape in Chapter 5 for information about the repair kit.

Operating Procedures 3–9

3.7.2 Setting the File-Protect Selector
A thumbwheel selector on the side of the cartridge can be set to one of two positions by
rolling the thumbwheel to the left or right.
When the selector is in the File-Protect position, a white dot on the flat surface of the
selector shows. This symbol means that the cartridge is file protected and can be used
only for reading data.
When the selector is in the unprotected position, the rounded surface of the selector is
visible and no symbol shows. This means the cartridge can be used for reading, writing,
and erasing data.

FILE−PROTECTED
POSITION

UNPROTECTED
POSITION

SHR−XR0055−90

Figure 3–7

File-Protect Selector Position

NOTE
Any cartridge that is in the drive and is not file protected can be overwritten.

3–10 Operating Procedures

3.7.3 Inserting Tape Cartridges
The cartridges are placed in the loader sequentially, from the bottom of the input stack
to the top. The lowest cartridge slot on the input stack is called the feed position.
Cartridges should not be placed in the feed position except for specific volume requests.
This prevents the following problem:
•

An operator error occurs if you place a cartridge in the feed position when another
cartridge is already loaded on the drive. However, the error will not be detected until
the drive attempts to unload the cartridge.

•

If the next system request is for a volume other than the volume mounted, you have
to remove the cartridge you just placed in the feed position.

NOTE:
A cartridge placed in the feed position will automatically be loaded into the
drive and the drive is enabled. The Start switch does not need to be pressed.
For most efficient operation, place the cartridges in the input stack in adjacent slots, just
above the feed position.

SHR−XR0059−90

Figure 3–8

Tape Cartridge (Loading Position)

1. Insert the cartridges when the indexing mechanism is not moving, such as when a
tape is being processed, or when the loader is in the Manual mode.
2. Hold the cartridge with the smooth side up and with the leader block facing the drive.
3. When inserting a cartridge in the input stack, in a slot other than the feed position,
line the cartridge up with a slot on the input stack and slide the cartridge in until it
stops.

Operating Procedures 3–11

4. If you are inserting a cartridge in the feed position, line the cartridge up with the
feed position, and slide the cartridge in until you feel and hear the loader’s tractor
assemblies engage and lightly hold the cartridge.
Cartridges placed incorrectly into the loader do not successfully load, and require
operator attention to correct.

SHR−XR0060−90

Figure 3–9

Cartridge Loader (Load Position)

3–12 Operating Procedures

3.7.4 Starting Operations
1. Select and press the mode selection switch for the desired operating mode.
For a description of the operating modes, see Section 2.4.2.
2. Press the Start switch 1 on the loader operator panel.
1

Autoloader

Drive

Auto
2
System

Ready
Manual
1

Unload
Start

Rewind
Power
Loader Panel

Tape Drive Operator Panel
SHR−XR0117−90

Figure 3–10

Cartridge Loader (Setting Switches)

3. Press the Ready switch 2 on the drive operator panel to the ready position and wait
for the light to go on.

Operating Procedures 3–13

The message display shows the drive condition when the cartridge is loaded. It also
shows whether the cartridge is file protected (F) or unprotected (U).
NOTE
R EADYU
This message can be overwritten by other messages.

d i g i t a l

R E A D Y

SHR−XR0087−90

Figure 3–11

Cartridge Loader (Messages)

The loader cannot function automatically when the input stack is empty and the last
processed cartridge has unloaded from the drive. The first indication of an empty input
stack is the visibly empty input stack itself. In a VMS operating system, the next
DISMOUNT/MOUNT request causes a blinking MOUNT message, a flashing attention
light on the drive display, and a flashing Attention light on the loader, indicating that
operator attention is required.
R EADYU
d i g i t a l

X X X X X X

SHR−XR0088−90

Figure 3–12

Cartridge Loader (Messages)

3–14 Operating Procedures

3.8 Removing Tape Cartridges from the Cartridge Loader
Remove tape cartridges when the indexing mechanism is not moving, such as when a
cartridge is being processed, when all activity on the loader has stopped, or when the
loader is in manual mode.
If you need to remove a tape cartridge that, for some reason, has not unloaded from
the drive, refer to Unloading and Removing Tape Cartridges in this chapter. If you are
removing tape cartridges that are not loaded on the drive, continue with the following
procedure.

3.8.1 Removing a Single Tape Cartridge
Remove a single cartridge from the input stack (including the feed position) by pulling it
toward you.
If the loader’s tractor assembly is engaged and holding a cartridge in the feed position,
you may feel some resistance when you pull on the cartridge. Continue to pull the
cartridge toward you until you overcome the resistance and remove the cartridge.

SHR−XR0060A−90

Figure 3–13

Cartridge Loader (Remove Single Cartridge)

Operating Procedures 3–15

3.8.2 Removing Multiple Tape Cartridges
Remove multiple cartridges from the output stack by placing one hand below the
stack and one hand on top of the stack to keep it steady. Pull the stack of cartridges
toward you. Cartridges in the middle of the stack may slip out. Avoid carrying stacks of
cartridges for long distances.

SHR−XR0061−90

Figure 3–14

Cartridge Loader (Removing Multiple Cartridges)

3–16 Operating Procedures

3.8.3 Unloading and Removing Tape Cartridges
Sometimes, you may need to unload the tape before you can remove the cartridge. In
those instances, issue an UNLOAD command from the host system. If the UNLOAD
command does not successfully unload the cartridge from the drive:
1. Place the Ready switch 1 to the not ready position and wait for the ready light to go
off.
2. Press the Unload switch 2 .
WARNING
Pressing the Unload switch when the tape has not been rewound can cause a
job to abort.

Drive

Ready
2

Unload

Rewind

SHR−XR0118−90

Figure 3–15

Cartridge Loader Operator Panel Switches

Operating Procedures 3–17

The message display shows the drive condition while the rewind-and-unload operation
is in progress. When the rewind-and-unload operation is complete, the message display
shows an asterisk (*).

d i g i t a l

U N L O A DN G
d i g i t a l

SHR−XR0089−90

Figure 3–16

Cartridge Loader (Messages)

3. When the loader has placed the cartridge in the feed position or the output stack,
remove the cartridge by pulling it toward you.

3–18 Operating Procedures

3.8.4 Rewinding a Tape
During normal operations, the drive automatically rewinds and unloads the tape when a
job completes. However, there may be times when you need to rewind the tape but not
unload it. To do this:
1. Press the Ready switch 3 to the not ready position and wait for the ready light 4 to
go off.
2. Press the Rewind switch 5 .

Drive

Ready

Unload
5

Rewind

SHR−XR0119−90

Figure 3–17

Switches Used for Rewinding a Tape

Operating Procedures 3–19

The message display shows the drive condition while the rewind operation is in progress
and after the tape is rewound. For example: NT RDY U is displayed when the drive is
not ready and an unprotected cartridge is inserted.

d i g i t a l

R EW I N D N G
d i g i t a l

N T

R D Y U

SHR−XR0090−90

Figure 3–18

Rewinding Tape Message

3. Press the Ready switch 3 to the ready position and wait for the ready light 4 to
come on.
The message display shows the drive condition when the drive is ready. It also shows
whether the tape is file protected (F) or unprotected (U).
NOTE
This message can be overwritten by other messages.

3–20 Operating Procedures

3.9 Using Auto/Manual Modes on the Cartridge Loader
The loader has an operator panel which allows the operator to select and change modes
as desired.

3.9.1 Using Auto Mode
1. Press the Auto mode selection switch 1 .
NOTE
If the input stack is empty in Auto mode, the Attention light on the loader panel
flashes.
2. Place one to six cartridges in the input stack.
NOTES:
a. If a cartridge is already loaded, do not place another cartridge in the feed
position of the input stack. If a cartridge in the drive attempts to unload
when a cartridge is present in the feed position of the loader, the Attention
light on the loader flashes to indicate a problem.
b. A cartridge placed in the feed position is automatically loaded into the drive
without the necessity to press the Start switch.

Autoloader

Auto

System
1
Manual
2

Start

Power

SHR−XR0120−90

Figure 3–19

Cartridge Loader (Auto Mode)

3. Press the Start switch 2 .

Operating Procedures 3–21

The loader feeds and loads the cartridge, and waits for a request from the system.
NOTE
When you switch from Manual mode to Auto mode, you must press the Start
switch to start automatic operation of the loader.
As long as the input stack is refilled before the last tape is unloaded, and the output
stack is not allowed to completely fill, the cartridges continue to feed and load without
any other actions.
When the input stack is empty, and the last tape cartridge has been unloaded from the
drive, operation stops.
If the input stack becomes empty:
1. Place one or more cartridges in the input stack.
2. Press the Start switch to restart automatic operations.
If the output stack completely fills:
•

The Attention light on the loader flashes.

•

Loader operations stop. If a seventh cartridge is indexed to the feed position of the
loader as the sixth cartridge is indexed to the output stack, the seventh cartridge is
processed and returned to the feed position.

Do the following:
1. Remove one or more cartridges from the feed position and/or output stack.
2. Press the Start switch to restart automatic operations.

3–22 Operating Procedures

3.9.2 Using Manual Mode
1. Press the Manual mode selection switch 3 .
2. When a MOUNT message appears on the drive display or system console, place the
requested volume in the input stack.
The feed position (the lowest position on the input stack) saves time because the
loader does not have to index. If cartridges that you do not currently want to use are
premounted in the input stack, placing a cartridge in the feed position prevents them
from being indexed and loaded.
If you do not place a cartridge in the feed position, the first available cartridge in the
input stack is indexed and loaded when you press the Start switch.

Autoloader

Auto

System

Manual

Start

Power

SHR−XR0121−90

Figure 3–20

Cartridge Loader (Manual Mode)

3. Press the Start switch 2 , unless a cartridge was placed in the feed position.
When a cartridge unloads, it remains in the feed position until it is removed manually.
If you want to reuse the same cartridge for the next MOUNT request on that drive, you
must remove and reinsert the cartridge.

Operating Procedures 3–23

3.9.2.1 Raising an Empty Output Tray in Manual Mode
To raise an empty output tray without having to load a cartridge, do the following:
1. Make sure no cartridge is loaded or in the feed position.
2. Press the Manual mode 3 selection switch.
3. Place a cartridge in the input stack, but not in the feed position.
4. Press the Start switch 2 .
5. When the output tray begins to rise, remove the cartridge from the input stack before
it loads.

Autoloader

Auto

System

Manual

Start

Power

SHR−XR0121−90

Figure 3–21

Cartridge Loader (Manual Mode)

3–24 Operating Procedures

3.10 Cleaning Procedures
The tape path must be kept clean to prevent errors caused by contamination. A cleaning
cartridge is shipped with each tape control unit. We recommend that the cleaning
cartridge be replaced after 500 uses. You can keep track of the number of uses by
marking the label provided with each cartridge. Do not us a china-marking (grease)
pencil on the label.
The cleaning cartridge should be undamaged and clean when it is inserted into a tape
drive.

SHR−XR0056−90

Figure 3–22

Cleaning Cartridge

3.10.1 Cleaning the Tape Path
The tape path on each drive should be cleaned at least once every seven days. Processing
an unusually large amount of tape requires cleaning every 8 hours. The drive displays
a *CLEAN message after a predetermined amount of tape has processed. If you see this
message, clean the drive tape path as soon as possible. However, you should clean the
tape path once each shift regardless of whether a *CLEAN message is displayed.
The drive usage status, and the cleaning process, are drive-only functions. They are
unknown to the TA91 tape control unit and system processor. Therefore, information
about drive usage can be lost during maintenance or reconfiguration. In addition to the
regular weekly cleaning cycle and *CLEAN message requirements, the drives should be
cleaned before returning them to service after any of the following reset conditions occur:
•

Drive power on: clean the drive that was powered on.

•

Tape control unit power on—clean all the drives that are powered by the tape control
unit that was powered on.

Operating Procedures 3–25

•

Drive maintenance or checkout procedures: clean the drive that was serviced.

To clean the Tape Path:
1. Insert the cleaning cartridge the same was as a normal tape.

NOTE:
The cleaning cartridge should be undamaged and clean when it is inserted
into a tape drive.
Put the cartridge in the feed position (the cartridge will be loaded automatically into
the drive). It is not necessary to move the Mode switch or press the Start switch.
The cleaning cartridge can be put in the input stack, and the cleaning procedure will
take place whenever the cleaning cartridge is loaded into the drive. The cleaning
procedure has no effect on a job that is processing on the drive.
The drive threads the cleaning tape and then rewinds and unloads it when the
cleaning procedure completes.
2. When the cartridge has completed the unloading procedure, remove it.

SHR−XR0060−90

Figure 3–23

Loading the Cleaning Cartridge

3–26 Operating Procedures

3.11 Cleaning a Tape Cartridge
Inspect the cartridge for damage or dirt before inserting it into the drive. damaged or
dirty cartridges can reduce subsystem reliability and cause data loss. If dirt appears
on the cartridge, wipe the outside surfaces with a lint-free cloth that has been lightly
moistened with DIGITAL cleaning fluid (PN TUC01).

WARNING
Do not allow anything wet, including cleaning fluid, to contact the tape.
Make sure all cartridge surfaces are dry and the leader block is snapped into place before
loading the cartridge.

4
Care and Handling of the Magnetic Tape Cartridge

4.1 Cartridge Description and Handling
The tape cartridge (PN 30-29907-01) consists of one reel of 12.65 millimeter magnetic
tape in a cartridge case.

BRAKE MECHANISM
(IN CARTRIDGE)

LEADER
BLOCK

LEADER BLOCK LATCH

FILE−PROTECT
SELECTOR
CARTRIDGE CASE

SHR−XR0092−90

Figure 4–1

Magnetic Tape Cartridge

4–1

4–2 Care and Handling of the Magnetic Tape Cartridge

Each cartridge consists of a:
•

Reel of magnetic tape

•

Cartridge case with a leader block latch

•

Leader block

•

File-protect selector

•

A brake mechanism

Cartridges are shipped in cartons. Every carton of cartridges contains 30 cartridges
packed in 3 rows of 10. Each row of ten cartridges within the carton is sealed in plastic
to protect the cartridges from contamination during shipment. The plastic wrap is
provided with a tear string for easy opening.

Cartridges

SHR−XR0078−90

Figure 4–2

Tape Cartridge Packaging

4.2 Tape Media Requirements
All of DIGITAL’s tape drive products are designed and manufactured for high
performance and reliability. The considerations that are given to produce such products
must include the tape media that is to be used on them.
DIGITAL is constantly evaluating tape media in an ongoing effort to ensure a high
quality product. To date, there are no back-coated magnetic tapes that meet DIGITAL’s
specifiction. Back-coating has been found to cause such problems a tape slippage, load
failures, false End Of Tape (EOT) and Beginning Of Tape (BOT) sensing and more
frequent drive cleaning due to the residue left on the tape drive by the back coating. As
a result of these problems, back-coated magnetic tapes are not recommended for use on
the TA9X family of tape drives.

Care and Handling of the Magnetic Tape Cartridge 4–3

4.3 Unpacking and Handling
Incorrect handling, or an incorrect environment, can damage the magnetic tape or the
cartridges. See Section 4.6 for information.
To avoid damage to your tape cartridge, and to ensure continued subsystem reliability:
•

Leave the cartridges in their protective wrapping until you use them. When
unpacking new cartridges, remove the protective wrapping in your computer
room. Use the tear-string to remove the protective wrapping (do not use a sharp
instrument).
Inspect each cartridge to ensure that the leader block is correctly latched. If not,
push the leader block toward the cartridge until it catches in the latch.

•

Before using the cartridges, condition them to the normal operating environment for
at least 24 hours. See the Operating Environment section in this chapter.

•

When loading a cartridge into the tape drive, or when handling a cartridge, be sure
that the cartridge case is not dirty. Dirty tape cartridges can cause cartridge loading
problems or data loss. If a cartridge case is dirty, follow the instructions in the
Cleaning Procedures section in this chapter.

•

Do not carry cartridges loosely in a box or basket. The leader blocks can catch on
other cartridges and unlatch. If the leader block is not correctly latched into the
cartridge, loading errors can occur.

•

Do not load a damaged tape cartridge into a tape drive. Damaged cartridges
can interfere with the reliability of your subsystem. (For specific information about
damaged cartridges, see the Damaged Cartridges section in this chapter.) If a
cartridge is dropped, inspect it for damage before using it.

•

Do not pull tape from the cartridge after releasing the leader block. Opening the
cartridge can damage the tape leader block and the tape attachment, thus causing
load failures. See the Damaged Cartridges section in this chapter.

•

Do not handle tape that is outside the cartridge. Handling the tape can damage the
tape surface or tape edges, which might interfere with the read or write reliability.
Pulling on tape that is outside of the cartridge can damage the tape and brake
mechanism.

•

Do not expose the tape cartridge to moisture or direct sunlight.

•

Do not expose recorded cartridges to stray magnetic fields, such as those existing near
high-current cables or power supplies. Such exposure can cause the loss of recorded
data.

•

Do not expose unrecorded cartridges to stray magnetic fields such as those existing
near dc motors or ac generators. Exposure to such magnetic fields can degrade tape
performance.

NOTE
AC erasing all the magnetic records from the tape (degaussing) for security
purposes will not damage the tape.
•

Maintain the conditions described in the Storage Environment section in this chapter
for all cartridges stored outside your operating environment.

4–4 Care and Handling of the Magnetic Tape Cartridge

4.4 Cartridge Labels
Recesses are provided in the cartridge surface for attaching labels.
There are two kinds of cartridge labels: a customer label, and a volume/serial number
label. Attach the customer label to the top surface of the cartridge; attach the
volume/serial number label to the side opposite the file-protect selector as shown in
Figure 4–3. Place the labels in the recessed cartridge label areas only.
NOTE
Labels that extend outside of the recess areas can cause loading problems in
the drive, particularly when using an cartridge loader.
When using cartridge labels, make sure to:
•

Use peel-clean labels that do not leave a residue after they are removed.

•

Always remove the old label before applying a new label. Do not erase information
from labels on the cartridges.

•

Write information on the labels with markers that will not smear or leave a residue
on the cartridge. Do not use china marking pencils.

Customer Label

Volume/Serial Number Label

SHR−XR0093−90

Figure 4–3

Cartridge Label Locations

4.5 Stacking Cartridges
Cartridges are shipped vertically and should be stored with the reel in the vertical
position, but, you can lay the cartridges flat while moving them. The bottom of each
cartridge has two raised areas that fit into the indented label area on the top of another
cartridge. This helps prevent the cartridges from sliding.
Do not stack more than six cartridges. See the Storage Environment section in this
chapter.

Care and Handling of the Magnetic Tape Cartridge 4–5

4.6 Damaged Cartridges
The cost of a tape cartridge is low compared to the cost of damage to tape drives and
possible loss of recorded data. Therefore, check the cartridge for damage before using it
in the tape drive. A good practice is to copy essential records and keep them in a secure
storage area.
To ensure continued use of your cartridges and subsystem:
•

Do not attempt to open the cartridge case at any time. The upper and
lower parts of the case are welded. Separating them destroys the usefulness of
the cartridge.

•

Do not load a damaged cartridge into a tape drive. During an emergency, if you
need to recover data from a damaged cartridge, call your service representative.

The damage that can occur to a cartridge includes (Figure 4-4):
•

The cartridge case is cracked or broken.

•

The leader block latch is broken.

•

The leader block is broken.

•

The tape has become detached from the leader block.

•

The braking mechanism is jammed or broken.

•

The file-protect selector is damaged.

•

The cartridge case contains any liquid.

•

The tape was wound completely out of the cartridge onto the machine reel and
then reattached to the cartridge reel by the service representative. This repair is
temporary and permits the cartridge to be loaded one time so that the data can be
copied to a replacement cartridge.

•

The cartridge has any other obvious damage.

4.7 Tape Cartridge Environment
The environment includes all aspects of the operating and storage environment that can
affect the magnetic tape cartridge.

4.7.1 Operating Environment
The ambient operating environment for the drives using the tape cartridge should be:
•

15.6°C to 32.2°C (60°F to 90°F) dry bulb

•

20 to 80 percent relative humidity

•

25.6°C (78°F) maximum wet bulb.

NOTE
Before using a cartridge, condition it to the operating environment for a time
equal to, or greater than, the time it was out of the operating environment.
If the cartridge has been out of the operating environment for more than 24
hours, condition it only up to 24 hours.

4–6 Care and Handling of the Magnetic Tape Cartridge

4.7.2 Storage Environment
The original shipping container is the best storage container for the cartridges until it is
opened because the plastic wrapping prevents contamination and partially protects them
from humidity changes.
Cartridges can be stored within the following temperature and humidity ranges:
•

4.4°C to 32.2°C (40°F to 90°F) dry bulb

•

5 to 80 percent relative humidity

•

26.7°C (80°F) maximum wet bulb.

NOTE
Digital Equipment Corporation does not recommend continuous, extended
storage of the tape cartridges in the maximum temperature and humidity
environment. However, if necessary, you can store the cartridges in the
maximum-condition environment for up to four weeks without damaging the
data or the cartridge.

4.8 Cartridge Disposal
Disposing of the magnetic tape cartridge is a regulated procedure, governed by the rules
of the Environmental Protection Agency (EPA), regulation 40CFR261. The TA91 tape
cartridge is currently classified as nonhazardous waste and, as such, it may be disposed
of in the same way as normal office trash. (These regulations are amended from time to
time and should be reviewed at the time of disposal.)
If your local, state, or country (non-U.S.A.) regulations are more restrictive than EPA
40CFR261, they must be reviewed before cartridge disposal. You may contact your
account representative for information about the materials that are in the cartridge
assembly.

4.9 Data Security
Data security issues are an important aspect of magnetic tape management, and include:
Erasing
Burning
Shredding

4.9.1 Erasing
The data on cartridges can be erased using a high-energy (a minimum of 1200 oersted
peak field over the entire space to be occupied by the cartridge) ac degausser. This will
not harm the cartridge or tape and the cartridge can be reused.
The data on the tape can be entirely erased by heating the cartridge and tape to a
temperature above the Curie temperature (the temperature at which the magnetic
particles in the tape lose their magnetic characteristics).
For DIGITAL tape, the Curie temperature is 125°C (257°F). For effective data erasure,
the tape should be heated to 130°C (266°F). Cartridges heated to this temperature
are not reusable.

Care and Handling of the Magnetic Tape Cartridge 4–7

4.9.2 Burning
Comply with all applicable incineration regulations when burning cartridges and/or the
tape.

4.9.3 Shredding
DIGITAL recommends that you do not shred the cartridge or tape. If you do, make sure
that the process used for shredding and disposal complies with all regulations.

5
What to Do if You Have a Problem
This chapter identifies some of the problems that can occur while using the TA91
subsystem. Possible solutions are suggested after each problem. If a CHK XY message
is displayed, record the XY number and refer to the Check Code Table in Appendix B and
follow the instructions in the Action Required column.
Table 5–1 Problems? Quick Look Up Guide
Problem

Refer to

Cartridge
Loading

Section 5.1, You Can’t Insert a Cartridge
Section 5.10, There is a Check Code Message on the Message Display
Section 5.4, A Drive Does Not Become Ready
Section 5.9, Leader Block Detaches from Tape
Section 5.6, Tape Winds Completely Out of Cartridge

Cartridge
Unloading

Section 5.11, You Want to Unload a Cartridge after a Power Failure
Section 5.9, Leader Block Detaches from Tape
Section 5.5, Tape Does Not Rewind or Unload
Section 5.3, IML Procedure Fails

IML Procedure

Section 5.3, IML Procedure Fails

Message Display

Section 5.10, There is a Check Code Message on the Message Display
Section 5.4, A Drive Does Not Become Ready
Section 5.2, Message Display is Blank
Section 5.3, IML Procedure Fails

Cartridge Loader

Section 5.7.1, Attention Indicator is Flashing
Section 5.7.2, Attention Indicator is On Continuously (Not Flashing)
Section 5.8, You See a Message Code on the Message Display

5.1 You Can’t Insert a Cartridge
If the cartridge will not load:
•

Inspect the cartridge for damage. See Section 3.7.3, and Chapter 4 for more
information on cartridge handling.

•

Try to load another cartridge.
1. If the new cartridge can be inserted, the original cartridge may be defective.
Have your customer engineer inspect it for damage.
2. If the cartridge is not damaged but cannot be inserted, call your customeer
engineer.

5–1

5–2 What to Do if You Have a Problem

5.2 Message Display is Blank
If the message display is blank:
•

Power may not be supplied to the tape control unit. Set the tape control unit Power
On/Off switches to On.

•

The main service power to the subsystem may not be on. Follow your system
operating procedures for turning on the main power supply. See Section 3.6.

•

If the message display is still blank, call your service representative.

5.3 IML Procedure Fails
If there is an error during the IML procedure and the Error light displays (instead of the
Wait light):
•

Set the On Line Test/Off Line Test switch to Off Line Test and press the IML
pushbutton on the tape control unit operator set up panel. Immediately set the
On Line Test/Off Line Test switch back to On Line Test.

•

If the IML procedure still fails, call your customer engineer. Message displays may
hold useful information which should be relayed to your customer engineer.

5.4 A Drive Does Not Become Ready
If the drive will not become ready:
•

The Ready switch on the drive operator panel may not be in the ready position. Press
the switch to the ready position; the Ready light should come on.

•

The cartridge may not be inserted correctly. Remove the cartridge and insert it again.
See Section 3.8 and Section 3.7.3.

•

Record the check code, (if there is a check code message on the message display),
press the Unload switch, and try the operation again.

If the drive still does not become ready, or if there is a check code message on the
message display, record the code and contact your customer engineer.

5.5 Tape Does Not Rewind or Unload
If the tape will not rewind or unload:
•

The Ready switch on the drive operator panel might be in the ready position. Press
the switch to the not ready position; the Ready light should go off.

•

If there is a check code message on the message display, record the check code, press
the Unload switch, and try the operation again.

If the drive still does not rewind or unload, or if there is a check code message on the
message display, record the code and contact your customer engineer.

5.6 Tape Winds Completely Out of Cartridge
If the tape winds out of the cartridge, call your customer engineer. If there is a check
code message on the message display, record the code and report it to your customer
engineer.

What to Do if You Have a Problem 5–3

5.7 Cartridge Loader Recovery Procedure
There are two cartridge loader recovery procedures, one for loaders with flashing
Attention indicators, and the other for loaders with continuous Attention indicators
(not flashing). Perform the recovery procedure that is appropriate for your loader’s
condition.

5.7.1 Attention Indicator is Flashing
If the attention indicator is flashing:
•

Remove the cartridge from the feed position (if present).

•

Remove the cartridges from the output stack.

•

Add cartridges to the input stack if the loader is in Auto mode.

•

Press the Start switch to resume operation.

Further operator service may be required during the recovery situation if one of the
following conditions occurred:
•

A cartridge in the drive was returned to the feed position. Remove the cartridge and
press the Start switch again to resume operation.

•

In Manual mode, an attempt was made to load the same cartridge that was just
processed. If the same cartridge is to be used again, remove and reinsert it. Press
the Start switch to resume operations.
NOTE
The Attention indicator on the loader is turned off when the problem is
corrected.

5.7.2 Attention Indicator is On Continuously (Not Flashing)
If the attention indicator remains on, an error may have occurred within the loader and
the drive message display check code can aid in problem determination. See the Check
Code Table in Appendix B. If the check code table refers to this section, or if no check
code appears, continue with the following steps:
•

Remove the cartridge from the feed position (if present).

•

Remove the cartridges from the output stack.

•

Initiate a manual recovery attempt by pressing the Unload switch on the TA91:
— The recovery is successful if the attention indicator on the loader is turned off.
— If the Attention indicator on the loader begins flashing, perform the actions listed
in the Section 5.7.1.

•

If the attention indicator on the loader remains on continuously after pressing the
Unload switch three times, press the drive reset pushbutton and do the following:
1. Deallocate the drive. This must be done from an operating system which
currently has a path access to this device.
If the Attention indicator remains on continuously, proceed with the following
steps.
2. Dismount the drive.
3. Allocate and mount the drive.

5–4 What to Do if You Have a Problem

4. If a drive CHK XY error message appears on the drive’s message display, go to
the "Check Code Table" in Appendix B and perform the actions in the Action
Required column.
If the Attention indicator remains continuously on after repeating the recovery procedure
three times, call your customer engineer. If there is a check code message on the message
display, record the code and report it to your customer engineer.

What to Do if You Have a Problem 5–5

5.8 You See a Message Code on the Message Display
If you attempt to write on a tape that has its file-protect selector set to the file-protect
position, automatic operation stops, the cartridge remains in the drive, and an error
message is sent to the console and to the message display. By stopping automatic
operation, the system cannot bypass any cartridge and you can maintain control of
each cartridge. Pre-staged cartridges are kept in order.
You will have to go to both the console and the drive to recover from this error.
To recover:
1. Go to the drive and place the cartridge loader’s mode switch in the Manual position.
This will prevent the loader from lowering the cartridge from the feed position to the
output stack and inserting the next cartridge from the input stack when Step 2 is
performed.
2. If a tape is mounted, dismount and unload the tape.
3. Return to the drive.
a. Remove the cartridge from the feed position.
b. If the file-protect selector was incorrectly set, set it to the correct position. If the
incorrect cartridge was mounted, replace it with the correct one.

File−Protect
Selector

SHR−XR0094−90

Figure 5–1
c.

File-Protect Selector

Put the original or replacement cartridge into the feed position in the loader.

d. Reset the mode switch on the cartridge loader panel to the position it was in
before Step 1.
e.

Press the Start switch.

Do not press the Ready or Unload switches when you unload the cartridge. If you do, you
will cause an error on the drive. To recover from such an error:
1. Correct the original problem first and start the cartridge loader.
2. Go back to the console and mount the drive on-line.
This type of error can be avoided by making sure:
•

The file-protect selector is set to write enable before putting writable cartridges in the
loader.

•

All cartridges have the correct label.

5–6 What to Do if You Have a Problem

•

Pre-staged cartridges are in the correct order.

5.9 Leader Block Detaches from Tape
•

Replace the leader block on the tape by using the materials in the TA91 Leader Block
Repair Kit. Contact your branch representative for information. The kit contains
instructions for replacing the leader block.

•

If the leader block did not come out of the drive when you removed the cartridge,
do not use that drive because the leader block could be stuck in the threading
mechanism. Report the problem to your customer engineer.
NOTE
Replacing the leader block is a temporary repair and lets you insert the
cartridge one time so that the data can be copied to a replacement cartridge.
After repairing the leader block and recovering the data, do not use the
cartridge again. If the cartridge is within warranty, return it to Digital.

What to Do if You Have a Problem 5–7

5.10 There is a Check Code Message on the Message Display
If there is a check code message on the message display, record the code, then go to the
"Check Code Table" in Appendix B. The Check Code Table lists the check codes, their
definitions, and the actions to take in response to those check codes.
The Action Required column of the Check Code Table may direct you to perform the
check code recovery procedure or go to the Cartridge Loader Recovery Procedure section
in Chapter 5, which is the recovery procedure for the Cartridge Loader. If there is a
problem on the loader (the Attention Indicator on the loader is on or flashing), always
perform the recovery actions for the loader before attempting recovery actions on the
drive.

5.10.1 Check Code Recovery Procedure
•

Try to get the drive to unload the cartridge. See Section 3.8.4 or Section 3.8.
— Press the Ready switch to the not ready position; the ready light should go off.
— Press the Unload switch.

•

If the drive unloads the cartridge, then retry the operation.

•

If the drive does not unload the cartridge, press the Unload switch again.

•

If the drive still does not unload the cartridge:
— If there is a check code message on the message display, record the code and save
it for your customer engineer.
— Press the Unload switch.

•

If the drive unloads the cartridge, retry the operation.

•

If the drive still does not unload the cartridge, record the check code, if displayed,
and call your customer engineer.

5.11 You Want to Unload a Cartridge after a Power Failure
•

Use the appropriate procedure for restoring power (see Section 3.4, or Section 3.6).

•

Press the drive Unload switch.

A
Standard VMS System Commands

A.1 VMS Commands Used with TA91
The TA91 uses all the standard magnetic tape commands that can be invoked by your
operating system. This section outlines some of the major commands by which the VMS
operating system accesses the TA91.
If you are using an operating system other than VMS, use the same commands for
the TA91 that you normally use for any magnetic tape device. See the reference
documentation supplied with your system.
The following command descriptions are written assuming the TA91 tape cartridge is
already in the drive and the TA91 is called MUA0 by the system. These commands have
several qualifiers and options. For more detailed information on these commands, refer
to your operating system manuals.

A.1.1 ALLOCATE
ALLOCATE provides exclusive access to a device (such as the TA91) and optionally
establishes a logical name for that device. Once you have allocated a device, other users
cannot access that device until you explicitly DEALLOCATE it, or until you log out. Use
the following format to allocate the TA91.
ALLOCATE MUA0:

[logical name]

Example: To allocate the TA91 for your use and assign it the logical name TAPE1, type
the following.
$

ALLOCATE MUA0: TAPE1:

A–1

A–2 Standard VMS System Commands

A.1.2 INITIALIZE
CAUTION
Make sure that the tape is blank before initializing.
INITIALIZE writes directory information and file structure, specifies the device name
(MUA0 or TAPE1), and writes a volume name to the magnetic tape volume on the TA91.
The tape must not be write protected for the initialize operation. The command has the
following format.
INITIALIZE logical name: [volume name]

Example: To initialize the device called TAPE1 and assign the volume name GMB001,
type the following.
$

INITIALIZE TAPE1: GMB001

While the tape volume is being initialized, the select light blinks. When the initialize is
complete, the tape rewinds and then the select light stays off and "B.O.T. U." is shown in
the display.
For detailed information regarding volume names and magnetic tape operations, refer to
the Guide to VAX/VMS Disk and Magnetic Tape Operations (AI-Y506B-TE).

A.1.3 MOUNT
MOUNT lets you make a magnetic tape volume available for processing. With the TA91,
MOUNT takes the following format.
MOUNT/FOREIGN/CACHE=TAPE logical name: volume name

Example: To make GMB001 on TAPE1 available for processing, type the following.
$

MOUNT/FOREIGN/CACHE=TAPE TAPE1: GMB001

When you MOUNT the tape volume, the select light blinks. The select light is off and
B.O.T. U. or F. is in the display when the tape reaches BOT. The terminal displays a
message such as GMB001 MOUNTED ON MUA0:.
THE /FOREIGN qualifier must be used when you perform BACKUP commands. It must
not be used when you perform COPY commands.
For more information, see the VAX/VMS Mount Utility Reference Manual (AA-Z424ATE).

A.1.4 DISMOUNT
DISMOUNT cancels the previous MOUNT command (makes the unit unavailable for
processing) and rewinds the TA91 tape. To rewind and unload the TA91 tape, use the
following command format.
DISMOUNT logical name:

When the DISMOUNT command is invoked, the tape rewinds. When the rewind is
complete and the tape is ready for removal, the drive number is shown in the display.

Standard VMS System Commands A–3

To rewind to BOT without unloading the tape, use this format.
DISMOUNT/NOUNLOAD logical name:

While the tape is rewinding, the rewind message is in the display. When the operation is
complete, B.O.T. (U. or F.) is in the display.

A.1.5 BACKUP
BACKUP provides a means of protection against file volume corruption by creating
functionally equivalent backup copies.
To back up a file on the TA91, use this command format.
BACKUP/NOCRC/BUFF=x/BLOCK=xxxxx filename.ext devicename[logical name]:filename.bck

Refer to your system manuals before deciding on qualifiers for use with the BACKUP
command. For detailed information about BACKUP, see the VAX/VMS Backup Utility
Reference Manual (AA-Z407B-TE).
You can also COPY files onto the TA91 tape cartridge. See your operating system
reference manuals for more information on the COPY command.

A.2 Tape Drive Display Function
The VMS operating system commands MOUNT and DISMOUNT and the VMS system
services $MOUNT and $DISMOU now support the display function of certain Tape Mass
Storage Control Protocol (TMSCP) magnetic tape drives (for example, the TA90 family).
To use this function, the Hierarchical Storage Controller (HSC) connected to your system
must have a microcode level of Version 600 or later. Table A–1 describes how the tape
drive display function works.
Table A–1 Tape Drive Display Function
Tape in
drive?

MOUNT
command
entered?

Tape
mounted?

Tape
moving?

yes

Alternates between flashing
"MOUNT" and "label," where "label"
is the volume label of the tape
cartridge you want to mount

yes

Indicates the volume label of the
tape cartridge (assuming the tape
cartridge was mounted using the
VMS MOUNT command.)

yes

Indicates the volume label and
flashes a dot in lower right corner
of the display. The flashing dot
indicates that the tape is moving.

Display action

A–4 Standard VMS System Commands

Table A–1 (Cont.) Tape Drive Display Function
Tape in
drive?

MOUNT
command
entered?

Tape
mounted?

Tape
moving?

Indicates the unit number of the
drive in the format DRu (for
example, DR1). Using the unit
number, you can determine the
device name of the tape cartridge
drive. For example, DR1 could have
the device name MUA1.

yes

Indicates "B.O.T.U" (Beginning Of
Tape, tape Unloaded).

yes

no, dismounting

YES

Indicates "UNLOADING."

Display action

A.3 Backing Up on the TA91 with VMS
This section provides a general series of steps for backing up files on a TA91 when you
are using the VMS operating system. The steps are written assuming the TA91 is device
MUA0, and that a tape has been inserted.
1. $ ALLOCATE MUAO: TAPE1:
2. $ MOUNT/FOREIGN/CACHE=TAPE TAPE1: GMB001
3. $ BACKUP/xxxxx/xxxxx filename.ext TAPE1:filename.bck
4. $ DISMOUNT TAPE1:
5. $ DEALLOCATE TAPE1:
After step 4, the drive can be attached or allocated by another user/process/ job.

A.4 Data Compaction
When data compaction is turned on, data is compacted during a write operation, and is
de-compacted during a read operation. Use the following commands to turn compaction
on or off.

INIT/MEDIA_FORMAT=[NO]COMPACTION
BACKUP/MEDIA_FORMAT=[NO]COMPACTION

B
Check Code Table

Table B–1 Check Code Table
Check
Code

Error Code Definition

Action Required

CHK 02

Open LED in tape path sensor.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 03

A cartridge is present after the
message display tells you to
remove it.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 04

A tape tension error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 05

Tape path error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 06

Tape path error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 07

The file protect switch is
defective.

1. Unload the cartridge.
2. Replace the cartridge.

CHK 0E

A tape path sensor error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 14

A tape tension error–possible
broken tape.

1. Check the cartridge for broken tape.
2. If broken, replace the cartridge.
3. If not broken, perform check code recovery
procedure.

CHK 16

Servo failure.

Call your customer engineer.

CHK 17

Timer failure.

Call your customer engineer.

CHK 18

Drive interface failure.

Call your customer engineer.

CHK 19

Drive interface failure.

Call your customer engineer.

CHK 20

A reel null error during a load.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 21

The threading mechanism is
slow or stalled during a load.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 22

The threading mechanism
was not at the home position
during cartridge load.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 23

A reel null error during a load.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

B–1

B–2 Check Code Table

Table B–1 (Cont.) Check Code Table
Check
Code

Error Code Definition

Action Required

CHK 24

A reel null error during an
unload.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 25

A threading mechanism or
leader block malfunction.

Section 5.10.1, Check Code Recovery Procedure.

CHK 26

The cartridge latch failed
to release or a loader error
occurred.

Go to Section 5.7, Cartridge Loader Recovery
Procedure.

CHK 27

A tape path interrupt during
an unload operation.

Section 5.10.1, Check Code Recovery Procedure.

CHK 28

The tape is not attached to the
leader block pin.

Call your customer engineer.

CHK 29

Timer failure.

Call your customer engineer.

CHK 2A

An error at the last wrap null
point.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 2B

A mid-tape load failure.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 2C

Excessive file reel motor speed.

Call your customer engineer.

CHK 2D

Short tape in cartridge.

Call your customer engineer to verify defect.

CHK 31

The cartridge loader output
tray did not raise.

1. If the loader’s Attention indicator is not turned
on, press the Unload switch on the Operator
panel. If that doesn’t correct the problem, call
your customer engineer.
2. Go to Section 5.7, Cartridge Loader Recovery
Procedure.

CHK 36

There is a problem with the
interconnection between the
drive and the cartridge loader.

CHK 40

Parity error.

Call your customer engineer.

CHK 41

Power amplifier board failure.

Call your customer engineer.

CHK 42

Power amplifier board failure.

Call your customer engineer.

CHK 43

Power amplifier board failure.

Call your customer engineer.

CHK 44

A tape tension error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 46

Air pressure lost.

1. Unload the cartridge.
2. Call your customer engineer.

CHK 47

Air cooling lost. Possible
Excessive Component
Temperature.

1. Turn off power to the subsystem.
2. Call your customer engineer.

CHK 48

Tach error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

Check Code Table B–3

Table B–1 (Cont.) Check Code Table
Check
Code

Error Code Definition

Action Required

CHK 49

Counter parity error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 4A

Speed parity error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 4B

Clock parity error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 4C

Gap parity error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 4D

An analog converted (DAC)
parity error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 51

Timer hardware error.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 60

Thread/load failure.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 63

Thread/load failure.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 68

File reel motor failure.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 69

Tape path sensor interrupt.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 6D

The period counter equals 0.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK 82

Interconnection drive error.

1. Unload the cartridge.
2. Call your customer engineer.

CHK B0

A long-loop-write-to-read
operation was attempted with
a cartridge in the drive.

Perform the Section 5.10.1, Check Code Recovery
Procedure.

CHK C2

A parity error on the write
card.

1. Unload the cartridge.
2. Call your customer engineer.

CHK C3

A phase locked loop is not
sychronized.

1. Unload the cartridge.
2. Call your customer engineer.

CHK C4

Open track on the read/write
head or wire is open in cable.

1. Unload the cartridge.
2. Call your customer engineer.

CHK C5

If write enable is active and
read bias is not active, the
write operation stops with this
check.

1. Unload the cartridge.
2. Call your customer engineer.

CHK C6

Write driver failure.

1. Unload the cartridge.
2. Call your customer engineer.

CHK C7

+10.5 V regulator failure.

1. Unload the cartridge.
2. Call your customer engineer.

CHK D0

Wrong IML diskette used.

Insert the correct IML diskette and retry the
operation.

B–4 Check Code Table

Table B–1 (Cont.) Check Code Table
Check
Code

Error Code Definition

Action Required

CHK D1

The wrong tape control unit
IML diskette is being used.

Insert the correct IML diskette and retry the
procedure.

CHK EC

There is a problem with the
chassis of the cartridge loader.

Go to Section 5.7, Cartridge Loader Recovery
Procedure.

CHK ED

Loader control card failure.

Go to Section 5.7, Cartridge Loader Recovery
Procedure.

CHK EE

A failure in the cartridge
loader.

Go to Section 5.7, Cartridge Loader Recovery
Procedure.

CHK EF

A failure between the cartridge
loader and the drive.

Go to Section 5.7, Cartridge Loader Recovery
Procedure.

Index

A/B Fault switches, 2–5
Attention light, 2–14
Automatic cartridge loader
description, 1–4
Auto mode, using, 2–20, 3–20

Burning cartridges, 4–7

Can’t insert a cartridge, 5–1
Cartridge
tape cartridge, 4–1
Cartridge disposal, 4–6
Cartridge loader
attention indicator is on or flashing,
5–3
how to use auto/manual modes, 3–20
inserting a cartridge, 3–10
loader operator panel
general description, 2–19
mode selection switches, 2–20
Start switch, 2–22
recovery procedure, 5–3
removing a cartridge, 3–14
Case, cartridge
broken, 4–5
illustration of, 4–1, 4–5
separated, 4–5
Caution
leader block, 1–5
Check code
message on the message display, what
to do if you see a, 5–7
messages, 2–18
recovery procedure, 5–7
CHK xy message, 2–18
Cleaning the tape path, 3–24
*CLEAN message, 2–17
Condition messages, drive, 2–16
Configurations, subsystem, 1–1

Damaged cartridges, 4–5
Data
loss, 4–3, 4–5
Data security, 4–6
DC Power light, 2–10
Detached leader block, 4–5
Dirty cartridge, cleaning of, 3–26
Disable light, 2–10
Display Function, A–3
Displaying drive messages, 2–15
Disposing of cartridges, 4–6
DR # message, 2–16
Drive condition messages, 2–16
Drive does not become ready, what to do if
the, 5–2

E.O.T. message, 2–17
Emergencies
removing power, 3–2
restoring power after, 3–3
Emergency Power switch, Unit, 2–4
Environment
considerations, 4–3
operating, 4–3
Erasing cartridges, 4–6
ERASING message, 2–17
Error light, 2–10
Error messages, 2–18

File-protect selector, 4–1, 4–5
File-Protect selector
purpose, 1–5
setting, 3–9

Index 1

2 Index

Messages (Cont.)
drive condition, 2–16

Identification, cartridge, 4–5
Identifiction, cartridge, 4–1
IML procedure fails, what to do if the,
5–2
IML pushbutton, 2–9
insert a cartridge, can’t, 5–1
Inspecting tape cartridges, 3–8

Normal/Test switch, 2–6
NOT RDY F message, 2–16
NOT RDY U message, 2–16

Labels, 4–4
tape cartridge, 1–5
Leader block
illustration of, 4–1, 4–5
Leader block caution, 1–5
Leader block detaches from the tape, what
to do if the, 5–6
Leader block latch
illustration of, 4–5
Leader block latch, illustration of, 4–1
Lights
drive
Attention light, 2–14
Ready, 2–14
Selected light, 2–15
tape control unit, 2–3
DC Power, 2–10
Disable, 2–10
Error, 2–10
Power On, 2–3
TCU Off Line, 2–8
Wait, 2–10
Loader operator panel, description, 2–19
Loading the microprogram, 3–1
Local Power Enable pushbutton, 2–12

Magnetic tape
cartridge labels, 4–4
identification, 4–1
illustration, 4–1
reel, 4–1
Magnetic tape cartridge
can’t insert a, 5–1
description, 1–5
File-Protect selector, 1–5
how to remove, 3–14
labels, 1–5
Manual mode, using, 2–21, 3–22
Message display
description of, 2–15
types of messages, 2–15
Message Display
adjusting, 2–15
Message display is blank, 5–2
Messages
check code, 2–18

On Line Test/Off Line Test switch, 2–7
Operating environment, 4–5
Operating procedures
emergency power removal, 3–2
inserting a cartridge in the cartridge
loader, 3–10
removing a multiple tape cartridge,
3–15
removing a single tape cartridge, 3–14
restoring power, 3–7
rewinding a tape, 3–17
setting File-Protect selector, 3–9
subsystem, 3–1
unloading and removing tape
cartridges, 3–16
Operator panel
drive, 1–2
Attention light, 2–14
message display, 2–15
Ready light, 2–14
Ready switch, 2–13
Rewind switch, 2–14
Selected light, 2–15
Unload switch, 2–14
drive operator’s, 2–13
Attention light, 2–14
Ready light, 2–14
Ready switch, 2–13
Rewind switch, 2–14
Selected light, 2–15
Unload switch, 2–14
tape control unit, 1–2
A/B Fault switches, 2–5
DC Power light, 2–10
Disable light, 2–10
Error light, 2–10
IML pushbutton, 2–9
Local Power Enable pushbutton,
2–12
Normal/Test switch, 2–6
On Line Test/Off Line Test switch,
2–7
Power On/Off switch, 2–3
Power On light, 2–2, 2–3
Remote/Local switch, 2–11
TCU 0/TCU 1 switch, 2–7
TCU address switches, 2–12
TCU Off Line light, 2–8
Unit Emergency Power switch, 2–4
Wait light, 2–10

Index 3

operator panel locations
drive, 1–2
Operator panel locations
subsystem, 2–1

Panel locations
tape control unit, 1–2
Power
emergency removal, 3–2
removing, 3–5
restoring, 3–7
restoring after emergency, 3–3
Power failure, how to unload a cartridge
after a, 5–7
Power On/Off switch
tape control unit, 2–3
Power On light, 2–3
Problem, what to do if you have a
can’t insert a cartridge, 5–1
check code message on the message
display, 5–6
drive does not become ready, 5–2
IML procedure fails, 5–2
leader block detaches from the tape,
5–6
message display is blank, 5–2
tape does not rewind or unload, 5–2
tape winds completely out of the
cartridge, 5–2
unloading a cartridge after a power
failure, 5–7
Procedures for operating a subsystem
cleaning a tape cartridge, 3–26
cleaning the tape path, 3–24
Pushbuttons
Local Power Enable, 2–12
tape control unit
IML pushbutton, 2–9

Ready light, 2–14
Ready switch, 2–13
READY U message, 2–16
Reel, tape, 4–1
Remote/Local switch, 2–11
Restoring power during normal operation,
3–5, 3–7
Rewinding a tape, 3–17
REWINDING message, 2–16
Rewind switch, 2–14

Selected light, 2–15
Selector, file protect, 4–2
Setting the File-Protect selector, 3–9
Shredding cartridges, 4–7
Storage environment, 4–6

Subsystem operating procedures, 3–1
Switches
drive
Ready, 2–13
Rewind, 2–14
Unload, 2–14
tape control unit
A/B Fault, 2–5
Normal/Test, 2–6
On Line Test/Off Line Test, 2–7
Power On/Off, 2–3
Remote/Local, 2–11
TCU 0/TCU 1, 2–7
TCU Address, 2–12

Tape
how to rewind, 3–17
Tape cartridge
burning, 4–7
case, illustratin of, 4–2
description, 4–2
disposing of, 4–6
environment, 4–5
erasing, 4–6
handling, 4–2
illustration of, 4–2
labels, 4–4
loading, 4–3
magnetic field precautions, 4–3
operating, precaution, 4–5
parts of, 4–2
security, 4–6
shipping, 4–2
shredding, 4–7
stacking, 4–4
storage, 4–6
Tape control unit
operator panel location, 2–1
operator panel locations, 1–2
operator setup panel, 2–2
TCU Address switches, 2–12
Tape does not rewind or unload, what to
do if the, 5–2
Tape drive
description, 1–3
display function, A–3
operator’s panel
Ready light, 2–14
Unload, 2–14
Operator panel, 2–13
Ready switch, 2–13
Rewind switch, 2–14
operator panel locations, 1–3
Tape path, cleaning the, 3–24
Tape transport unit
description, 1–3
TCU 0/TCU 1 switch, 2–7
TCU Address
tape control unit, 2–12
TCU Off Line light, 2–8

4 Index

Temperature limits, 4–6
Threading the tape, 1–5

W
U

Unit Emergency Power Switch, 2–4
Unloading a cartridge after a power
failure, 5–7
UNLOADING message, 2–16
Unload switch, 2–14
Unpacking tape cartridges, 4–3

Wait light, 2–10
WARNING
cartridge cleaning, 3–26
What to do if you have a problem, 5–1

XXXXXX message, 2–17