TSZ07 Tape Drive
digi tal

Technical Manual
Order Number: EK–TSZ07–TM–003
TSZ07 Tape Drive
Technical Manual
Order Number: EK–TSZ07–TM–003
Prepared by
Information Consulting and Design
Digital Equipment Corporation • Merrimack, NH 03054
October 1992
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.
No responsibility is assumed for the use or reliability of software on equipment that is not supplied by
Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions 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 1992
All Rights Reserved.
Printed in U.S.A.
CDA, DECUS, DDIF, DEC, DECimage, DECwindows, PDP, ThinWire, VAX, VMS, UNIBUS, and the
DIGITAL logo are trademarks of Digital Equipment Corporation.
Lubriplate® is a registered trademark of Fiske Brothers Refining Co.
Loctite® is a registered trademark of Loctite Corporation.
This document was prepared using VAX DOCUMENT, Version 2.1.
Contents
Preface
xi
Chapter 1 Introduction
1.1
1.2
1.3
1.4
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
Physical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
1.2.1
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
1.2.2
Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.2.3
Top View of Deck Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
1.2.4
Bottom View of Deck Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8
1.2.5
Major Circuit Board Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–9
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10
1.3.1
Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10
1.3.2
Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10
1.3.3
Servo Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–11
Access Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–11
Chapter 2 Operation
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Density Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.1
Power-Up Density Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.2
Host Density Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.3
Automatic Density Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2.2.4
Operator Density Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
Activity Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
Automatic Tape Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
Manual Tape Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
Unloading Tape Automatically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
Unloading Tape Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
iii
Chapter 3 Maintenance
3.1
3.2
3.3
Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
Chapter 4 Troubleshooting
4.1
4.2
4.3
4.4
4.5
Power-on Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
Error Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Error Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3.1
Soft Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3.2
Medium Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3.3
Medium-Hard Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3.4
Hard Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Fault Symptom Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3
Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.5.1
Selecting Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.5.2
Tape-Unloaded Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4.5.2.1
Service Aid 111 (Servos) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4.5.2.2
Service Aid 125 (Firmware ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–11
4.5.2.3
Service Aid 131 (Sensors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12
4.5.2.4
Service Aid 132 (Solenoids) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12
4.5.2.5
Service Aid 134 (Blower) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–13
4.5.2.6
Service Aid 142 (Configuration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–13
4.5.3
Tape-Loaded Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–15
4.5.3.1
Service Aid 211 (Single-Pass Write/Read Check) . . . . . . . . . . . . . . . . 4–15
4.5.3.2
Service Aid 212 (Read/Write Data) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–17
4.5.3.3
Service Aid 222 (Tape Motion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–18
4.5.3.4
Service Aid 223 (Multi-Pass Write/Read Check) . . . . . . . . . . . . . . . . . 4–19
4.5.3.5
Service Aid 225 (Firmware ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–19
4.5.3.6
Service Aid 242 (Configuration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–19
4.5.3.7
Service Aid 244 (Tape Read) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–19
4.5.4
Special Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–21
4.5.4.1
Service Aid 513 (Head Calibration) . . . . . . . . . . . . . . . . . . . . . . . . . . 4–21
4.5.4.2
Service Aid 524 (Memory Initialization) . . . . . . . . . . . . . . . . . . . . . . . 4–21
4.5.4.3
Service Aid 525 (Motor Calibration) . . . . . . . . . . . . . . . . . . . . . . . . . . 4–22
4.5.4.4
Service Aid 533 (Door Lock and Interlock Disable) . . . . . . . . . . . . . . 4–22
4.5.4.5
Service Aid 542 (Vendor ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–23
4.5.4.6
Service Aid 543 (Product ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–23
iv
Chapter 5 Removal/Replacement Procedures
5.1
5.2
5.3
5.4
Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
Opening the Tape Drive to the Operator Access Position . . . . . . . . . . . . . . . . . . . . . . . . 5–4
5.2.1
Operator Access for the Rack-Mount Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
5.2.2
Operator Access for the Table-Top Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
Opening the Tape Drive to the Service Access Position . . . . . . . . . . . . . . . . . . . . . . . . . 5–6
5.3.1
Service Access for the Rack-Mount Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6
5.3.2
Service Access for the Table-Top Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–9
Removal/Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–10
5.4.1
Blower (P/N 29-28465-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–10
5.4.2
Control Switch Circuit Board (P/N 29-28463-01) . . . . . . . . . . . . . . . . . . . . . . 5–12
5.4.3
Front Door (P/N 29-28466-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–13
5.4.4
Door Lock (P/N 29-28476-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–14
5.4.5
EOT/BOT Sensor Assembly (P/N 29-28649-01) . . . . . . . . . . . . . . . . . . . . . . . 5–15
5.4.6
File-Protect Sensor (P/N FD-11389-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–16
5.4.7
Front Panel (P/N 29-28467-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–17
5.4.8
Front Panel Display Circuit Board (P/N 29-28468-01) . . . . . . . . . . . . . . . . . . 5–18
5.4.9
Head Circuit Board (P/N 29-28478-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
5.4.10 Hub Lock Solenoid (P/N 29-28475-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
5.4.11 Input Air Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.4.11.1
Removal Procedure Without Plenum Access Panel . . . . . . . . . . . . . . 5–24
5.4.11.2
Removal Procedure With Plenum Access Panel . . . . . . . . . . . . . . . . . 5–24
5.4.11.3
Replacing the Input Air Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.4.12 Interface Circuit Board (P/N 29-28477-01/29-30410-01) . . . . . . . . . . . . . . . . . 5–26
5.4.13 Interlock Switch (P/N 29-28476-02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–28
5.4.14 Left Output Air Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–29
5.4.15 Manual Release Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–30
5.4.16 Packer Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–31
5.4.17 Plenum (P/N 29-28482-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–32
5.4.18 Power Supply (P/N 29-28461-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–34
5.4.19 Read/Write Formatter Circuit Board (P/N 29-28480-01) . . . . . . . . . . . . . . . . . 5–36
5.4.20 Read/Write Head (P/N 29-28472-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–38
5.4.21 Right Output Air Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–39
5.4.22 Roller Guide 1 (P/N 29-24101-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–41
5.4.23 Roller Guide 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–42
5.4.24 Roller Guide 3 or 4 (P/N 29-24081-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–42
5.4.25 Roller Guide 5 (P/N 29-24081-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–43
5.4.26 Servo Circuit Board (P/N 29-28479-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–44
5.4.27 Supply Hub (P/N 29-24077-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–46
5.4.28 Supply Hub Bell Crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–47
5.4.29 Supply Motor (P/N 29-28470-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–48
v
5.4.30
5.4.31
5.4.32
5.4.33
5.4.34
5.4.35
Take-Up Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Take-Up Motor (P/N 29-28469-01) . . . . . . . . . . . .
Tape-In-Path Receiver (P/N 29-24093-00) . . . . . . .
Tape-In-Path Transmitter (P/N 29-28483-01) . . . .
Tension Sensor/Roller Guide 2 (P/N 29-28471-01)
Top Cover (P/N 29-28462-01) . . . . . . . . . . . . . . . .
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5–50
5–52
5–54
5–55
5–56
5–58
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. 6–2
. 6–4
. 6–4
. 6–7
. 6–9
6–11
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI Bus Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI Bus Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4.1
Attention Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4.2
Reset Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI Message System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.5.1
Messages — Format and Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.5.2
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1
B–1
B–5
B–5
B–5
B–5
B–6
B–6
B–7
B–8
B–9
Chapter 6 Adjustment Procedures
6.1
6.2
6.3
6.4
6.5
6.6
Interlock Switch Disable Procedure
Read Threshold Adjustment . . . . . .
Skew Adjustment . . . . . . . . . . . . . .
Supply Hub Adjustment . . . . . . . . .
Take-Up Hub Adjustment . . . . . . .
Operation Verification . . . . . . . . . .
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Appendix A Specifications
Appendix B Small Computer System Interface (SCSI)
B.1
B.2
B.3
B.4
B.5
B.6
B.7
Figures
1–1
1–2
1–3
1–4
1–5
1–6
2–1
TSZ07 Tape Drive Versions . . . .
Front Parts . . . . . . . . . . . . . . . .
Rear Parts . . . . . . . . . . . . . . . . .
Top Parts of Deck Plate . . . . . . .
Bottom Parts of Deck Plate . . . .
Major Circuit Board Assemblies .
TSZ07 Controls and Indicators .
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. 1–2
. 1–5
. 1–6
. 1–7
. 1–8
. 1–9
. 2–5
2–2
2–3
2–4
3–1
3–2
4–1
5–1
5–2
5–3
5–4
5–5
5–6
5–7
5–8
5–9
5–10
5–11
5–12
5–13
5–14
5–15
5–16
5–17
5–18
5–19
5–20
5–21
5–22
5–23
5–24
5–25
5–26
5–27
5–28
5–29
5–30
5–31
5–32
5–33
5–34
5–35
5–36
Write-Enable Ring . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Reel Insertion . . . . . . . . . . . . . . . . . . . . . . . .
TSZ07 Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . .
Location of Tape Path and Sensors . . . . . . . . . . . .
Location of Air Filter . . . . . . . . . . . . . . . . . . . . . . .
Assigned Numbers of Control Panel Switches . . . .
Operator Access Position . . . . . . . . . . . . . . . . . . . .
Location of Retaining Screws . . . . . . . . . . . . . . . . .
Service Access Position . . . . . . . . . . . . . . . . . . . . .
Removing the Blower . . . . . . . . . . . . . . . . . . . . . . .
Removing the Control Switch Circuit Board . . . . .
Removing the Door . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Door Lock . . . . . . . . . . . . . . . . . . . .
Removing the EOT/BOT Sensor Assembly . . . . . . .
Removing the File-Protect Sensor . . . . . . . . . . . . .
Removing the Front Panel . . . . . . . . . . . . . . . . . . .
Removing the Front Panel Display Circuit Board .
Removing the Head Circuit Board . . . . . . . . . . . . .
Removing the Hub Lock Solenoid . . . . . . . . . . . . . .
Removing the Input Air Duct . . . . . . . . . . . . . . . . .
Removing the Interface Circuit Board . . . . . . . . . .
Removing the Interlock Switch . . . . . . . . . . . . . . .
Removing the Left Output Air Duct . . . . . . . . . . . .
Removing the Manual Release Switch . . . . . . . . . .
Removing the Packer Arm . . . . . . . . . . . . . . . . . . .
Removing the Plenum . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Supply . . . . . . . . . . . . . . . . .
Removing the Read/Write Formatter Circuit Board
Removing the Read/Write Head . . . . . . . . . . . . . . .
Removing the Right Output Air Duct . . . . . . . . . .
Removing Roller Guide 1 . . . . . . . . . . . . . . . . . . . .
Removing Roller Guide 3 or 4 . . . . . . . . . . . . . . . .
Removing Roller Guide 5 . . . . . . . . . . . . . . . . . . . .
Removing the Servo Circuit Board . . . . . . . . . . . . .
Removing the Supply Hub . . . . . . . . . . . . . . . . . . .
Removing the Supply Hub Bell Crank . . . . . . . . . .
Removing the Supply Motor . . . . . . . . . . . . . . . . . .
Removing the Take-Up Hub . . . . . . . . . . . . . . . . . .
Removing the Take-Up Motor . . . . . . . . . . . . . . . .
Removing the Tape-in-Path Receiver . . . . . . . . . . .
Removing the Tape-in-Path Transmitter . . . . . . . .
Removing Tension Sensor/Roller Guide 2 . . . . . . . .
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. 2–8
. 2–9
2–11
. 3–2
. 3–3
. 4–9
. 5–5
. 5–7
. 5–8
5–11
5–12
5–13
5–14
5–15
5–16
5–17
5–19
5–21
5–23
5–25
5–27
5–28
5–29
5–30
5–31
5–33
5–35
5–37
5–38
5–40
5–41
5–42
5–43
5–45
5–46
5–47
5–49
5–51
5–53
5–54
5–55
5–57
5–37
6–1
6–2
6–3
6–4
6–5
6–6
Removing the Top Cover . . . . . . . . . . . . . . . .
Location of Interlock Switch . . . . . . . . . . . . . .
Location of Skew Adjustment Screw . . . . . . .
Skew Adjustment Waveform . . . . . . . . . . . . .
Location of Supply Hub Screws . . . . . . . . . . .
Aligning Motor Shaft with Supply Hub Dwell
Adjusting the Take-Up Hub . . . . . . . . . . . . . .
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5–58
. 6–3
. 6–5
. 6–6
. 6–7
. 6–8
6–10
Tables
1–1
2–1
2–2
4–1
4–2
4–3
4–4
4–5
4–6
4–7
4–8
4–9
4–10
4–11
4–12
4–13
4–14
4–15
4–16
4–17
4–18
4–19
4–20
4–21
4–22
4–23
5–1
5–2
A–1
B–1
B–2
B–3
B–4
TSZ07 Tape Drive Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
TSZ07 Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Operating Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
Fault System Codes (FSC) with Related FM, ERPs and FRUs . . . . . . . . . . . . . 4–3
Fault Messages (FM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
Error Recovery Procedure (ERP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7
Field Replaceable Units (FRU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8
Service Aid 111 Test Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
Service Aid 111 Switch Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–11
Service Aid 125 Front Panel Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12
Front Panel Switch Functions in Review Mode . . . . . . . . . . . . . . . . . . . . . . . . 4–13
Front Panel Switch Functions in Change Mode . . . . . . . . . . . . . . . . . . . . . . . . 4–13
TSZ07 Configuration Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–14
Switch Functions in the Execution Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–16
Front Panel Switch Functions in the Status Mode . . . . . . . . . . . . . . . . . . . . . . 4–16
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–17
Service Aid 212 Front Panel Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–18
Front Panel Switch Function in the Selection Mode . . . . . . . . . . . . . . . . . . . . 4–18
Front Panel Switch Functions in the Robot Mode . . . . . . . . . . . . . . . . . . . . . . 4–18
Front Panel Switch Functions in the Read Mode . . . . . . . . . . . . . . . . . . . . . . . 4–19
Front Panel Switch Functions in the Status Mode . . . . . . . . . . . . . . . . . . . . . . 4–20
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–20
Front Panel Switch Functions During Service Aid 524 . . . . . . . . . . . . . . . . . . 4–22
Front Panel Switch Functions during Service Aid 525 . . . . . . . . . . . . . . . . . . . 4–22
Front Panel Switch Functions during Service Aid 542 . . . . . . . . . . . . . . . . . . . 4–23
Front Panel Switch Functions during Service Aid 543 . . . . . . . . . . . . . . . . . . . 4–23
TSZ07 FRUs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
Special Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
TSZ07 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
SCSI Bus Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2
Pin Assignments for the Single-Ended Shielded Connections . . . . . . . . . . . . . B–3
Pin Assignment for the Differential Shielded Connections . . . . . . . . . . . . . . . . B–4
SCSI Bus Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–5
viii
B–5
B–6
B–7
B–8
Messages — Format and Codes
SCSI Messages . . . . . . . . . . . . .
Status Bytes . . . . . . . . . . . . . . .
TSZ07 SCSI Commands . . . . . .
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B–6
B–7
B–8
B–9
Preface
This manual provides the information necessary to troubleshoot, and repair the TSZ07 Tape
Drive. Programming information concerning the Small Computer System Interface (SCSI)
used in the TSZ07 is also provided.
Throughout this manual the TSZ07 Tape Drive will be referred to as either the TSZ07 or the
drive.
Structure of this Manual
This manual is structured as follows:
Chapter 1, Introduction — Provides a general, physical and functional description of the
TSZ07 Tape Drive.
Chapter 2, Operation — Describes the controls and indicators and describes how to load
and unload tape.
Chapter 3, Maintenance — Describes how to perform the required tape drive preventive
maintenance, which is limited to regular cleaning of the tape path, sensors, and air filter.
Chapter 4, Troubleshooting — Describes the self-diagnostic and troubleshooting capabilities designed in the tape drive; how tape processing errors and tape drive faults are reported;
and how to use service aids resident in the firmware of the drive. This chapter also provides
a list of the error recovery procedures.
Chapter 5, Removal/Replacement Procedures — Provides the removal/replacement
procedures for various components and assemblies of the tape drive with references to service
aids and the appropriate adjustment procedures when necessary. The procedures are for use
by qualified service personnel familiar with the drive unit.
Chapter 6, Adjustments — Provides the adjustment procedures, purpose of the adjustments
and when they should be used.
Appendix A, Specifications — Provides the specifications for the TSZ07 Tape Drive.
Appendix B, Small Computer System Interface (SCSI) — Describes the SCSI 2 and the
associated control signals, messages, status bytes and commands.
xi
Related Documents
The following are publications that support the TSZ07 Tape Drive:
•
TSZ07 Tape Drive Installation/Owner’s Manual (EK-TSZ07-IN)
•
TSZ07 Tape Drive Pocket Service Guide (EK-TSZ07-PG)
•
Small Computer System Interface: An Overview (EK-SCSIS-OV)
•
Small Computer System Interface: A Developer’s guide (EK-SCSIS-DK)
•
KZQSA Module Installation Guide (EK-KZQSA-IG)
•
H9642 Cabinet Maintenance Guide (EK-187AA-MG)
•
Field Maintenance Print Set (MP-03190-01)
•
MicroVAX Diagnostic Monitor User’s Guide (AA-FM7AE-DN)
Notes, Cautions, and Warnings
Where notes, cautions, and warnings are used in this document, specific types of information
are highlighted as follows:
NOTE — Calls the attention to any item of information that may be of special importance to
the reader.
CAUTION — Contains essential information to avoid damage to the equipment.
WARNING — Contains essential information for the safety of the user.
xii
FCC USER STATEMENT
NOTICE:
This equipment generates, uses, and may emit radio frequency. The equipment has
been type tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of FCC rules, which are designed to provide reasonable protection
against such radio frequency interference.
Operation of this equipment in a residential area may cause interference in which case
the user at his own expense will be required to take whatever measures may be required
to correct the interference.
xiii
Für Bundesrepublik Deutschland end Berlin (West) For Federal Republic of Germany end
West Berlin Pour la République féderale d’Allemagne et Berlin Ouest
Hochfrequenzgerätezulassung end Betriebsgenehmigung
Bescheinigung des Herstellers/Importeurs
Hiermit wird bescheinigt, daß die Einrichtung in Übereinstimmung mit den Bestimmungen
der DBP-Verfügung 523/1969, Amtsblatt 113/1969, end Grenzwertklasse "A" der VDE0871,
funkentstört ist.
Das Zentralamt für Zulassungen im Fernmeldewesen der Deutschen Bundespost (DBP), hat
diesem Gerät eine FTZ-Serienprüfnummer zugeteilt.
Betriebsgenehmigung Hochfrequenzgeräte dürfen erst in Betrieb genommen werden, nachdem hiefür von dem für den vorgesehenen Aufstellungsort zuständigen Fernmeldeamt
mit Funkstörungsmeßstelle die Genehmigung erteilt ist. Als Antrag auf Erteilung einer
Genehmigung dient eine Anmeldepostkarte (Anhang des Handbuches) mit Angabe der FTZSerienprüfnummer. Der untere Teil der Postkarte ist vom Betreiber zu vervollständigen end
an das örtliche Fernmeldeamt zu schicken. Der obere Teil bleibt beim Gerät.
Betreiberhinweis Das Gerät wurde funktechnisch sorgfältig entstört end geprüft. Die Kennzeichnung mit der Zulassungsnummer bietet Ihnen die Gewähr, daß dieses Gerät keine anderen Fernmeldeanlagen einschließlich Funkanlagen stört. Sollten bei diesen Geräten ausnahmsweise trotzdem, z.B. im ungünstigsten Fall beim Zusammenschalten mit anderen EDVGeräten, Funkstörungen auftreten kann das im Einzelnen zusätzliche Funkenstörungsmaßnahmen durch den Benutzer erfordern. Bei Fragen hierzu wenden Sie sich bitte an die örtlich
zuständige Funkstörungsmeßstelle Ihres Fernmeldeamtes.
Externe Datenkabel Sollte ein Austausch der von Digital spezifizierten Datenkabel nötig werden, muß der Betreiber für eine einwandfreie Funkentstörung sicherstellen, daß Austauschkabel im Aufbau end Abschirmqualität dem Digital Originalkabel entsprechen.
Kennzeichnung Die Geräte werden bereits in der Fertigung mit der Zulassungsnummer
gekennzeichnet end mit einer Anmeldepostkarte versehen. Sollte Kennzeichnung end Anmeldepostkarte übergangsweise nicht mit ausgeliefert werden kontaktieren Sie bitte das
nächstgelegene Digital Equipment Kundendienstbüro.
xiv
Chapter 1
Introduction
This chapter provides general, physical, and functional descriptions of the TSZ07 Tape Drive
and provides illustrations showing the major parts of the drive.
1.1 General Description
The TSZ07 Tape Drive (shown in Figure 1–1) is a high-capacity streaming, nine-track, reelto-reel, half-inch magnetic tape drive unit with the capability of reading or writing in one
of two selectable recording densities. The drive is designed for the interchanging of data,
archival storage, software distribution, online transaction management, and the backup of
small and large computing systems. Connection to external computer equipment is by way
of an onboard Small Computer System Interface (SCSI 2) which conforms to the American
National Standard Institute (ANSI) specification X3T9.2/89-042. The TSZ07 Tape Drive
comes with either a single-ended or differential-ended SCSI interface (see to Table 1–1).
Single-ended drives allow a total SCSI bus length of 6 meters; differential-ended drives allow
a total SCSI bus length of 25 meters.
Introduction 1–1
Figure 1–1: TSZ07 Tape Drive Versions
1–2 Introduction
There are four versions of the TSZ07 Tape Drive as described in Table 1–1.
Table 1–1: TSZ07 Tape Drive Versions
Description
Order Number
Rackmount unit without power cord. Customer must order the correct
country kit to obtain power cord. Single-ended SCSI.
TSZ07-AA
Rackmount unit installed in a Digital 40-inch high H9642 style cabinet
with an 874-D, 120 Volt, 24 Ampere, Filtered Power Controller. Singleended SCSI.
TSZ07-BA
Rackmount unit installed in a Digital 40-inch high H9642 style cabinet
with an 874-F, 240 Volt, 12 Ampere, Filtered Power Controller. Power cord
for the power controller must be ordered separately. Single-ended SCSI.
TSZ07-BB
Table-top unit without power cord. Customer must order the correct
country kit to obtain power cord. Single-ended SCSI.
TSZ07-CA
SCSI interface magtape, rackmountable reel to reel, 1600/6250 bits/in.
Differential-ended SCSI.
TSZ07-DA
SCSI magtape in H9642 cabinet with 874D, 120-Volt Power Controller.
Differential-ended SCSI.
TSZ07-EA
SCSI magtape in H9642 cabinet with 874F, 240-Volt Power Controller.
Differential-ended SCSI.
TSZ07-EB
SCSI interface magtape, table-top, reel to reel, 1600/6250. Differentialended SCSI.
TSZ07-FA
The table-top unit (TSZ07-CA/FA) is suitable for an open office environment that conforms
to the environmental limits stated in Appendix A. The rackmount unit (TSZ07-AA/DA) is
suitable for either a computer room or a manufacturing location. The Digital cabinet versions
(TSZ07-BA/EA or TSZ07-BB/EB) may be used in the same type environment as specified for
either the table-top or rackmount unit. Details covering the installation of the drive are
provided in the TSZ07 Tape Drive Installation/Owner’s Manual.
The TSZ07 reads and writes data at 100 inches per second (ips) in either the Phase Encoding
(PE) format at 1600 bits per inch (bpi) or the Group Code Recording format at 6250 bpi. The
drive uses industry-standard 0.5-inch wide tape with any of four reel sizes, 6.0, 7.0, 8.5, and
10.5 inches. The three larger tape reel sizes are auto-loaded by the TSZ07. The 6-inch reel
size does not have the same tape loading characteristics. Manual loading may be required
depending on the amount of tape on the 6-inch reel. Greater than 300 feet of tape is required
for auto-loading to be achieved with a high degree of confidence.
Introduction 1–3
Communication to the drive is by way of the SCSI 2 interface at a synchronous rate of 4
Megabytes (1.5 Megabytes asynchronous) per second. The standard features of the drive
include:
•
Mounting in standard 19-inch EIA/RETMA † rack (rackmount version)
•
Automatic tape loading and threading
•
Drive parameters configurable from the front panel
•
Eight-character alphanumeric display on the front panel
•
Automatic read/write retry
•
Autoranging ac power supply
1.2 Physical Description
The three main physical assemblies of the drive are:
•
front panel
•
deck plate
•
chassis
The front panel is fastened to the deck plate. The front panel has a door that opens to allow
easy operator access for loading and unloading the magnetic tape. Beneath the door are
operator switches, indicators, and an eight-character alphanumeric display. Air inlets in the
front panel provide for cooling and automatic tape loading.
The deck plate is made of cast-aluminum and supports two dc motors, tape path sensors, and
a read/write head. The deck plate is hinged to the sheet metal chassis.
The chassis forms a box-like structure to protect the internal circuit boards and components.
Power and system interface connections are made at the back of the chassis.
The drive is designed for rack mounting, and is compatible with cabinets meeting the standard
19-inch EIA/RETMA form factor. A table-top enclosure is also available for the drive. For
the location of the major mechanical parts and electronic circuit board assemblies, refer to
Section 1.2.1 through Section 1.2.5.
† RETMA racks are standard sized cabinets used by Digital and other major manufacturers of electronic equipment. The
cabinet rails, mounting hole patterns, and spacing conform to international standards that allow compatibility with
products manufactured by Digital and other major manufacturers.
1–4 Introduction
1.2.1 Front View
Figure 1–2 shows the location of parts accessible from the front of the tape drive.
Figure 1–2: Front Parts
Introduction 1–5
1.2.2 Rear View
Figure 1–3 shows the location of the major parts at the rear of the drive.
Figure 1–3: Rear Parts
1–6 Introduction
1.2.3 Top View of Deck Plate
Figure 1–4 shows the location of major parts at the top of the drive.
Figure 1–4: Top Parts of Deck Plate
Introduction 1–7
1.2.4 Bottom View of Deck Plate
Figure 1–5 shows the location of the major parts at the bottom of the deck plate.
Figure 1–5: Bottom Parts of Deck Plate
1–8 Introduction
1.2.5 Major Circuit Board Assemblies
Figure 1–6 shows the location of the major circuit board assemblies in the TSZ07.
Figure 1–6: Major Circuit Board Assemblies
Introduction 1–9
1.3 Functional Description
The drive is designed to stream in a start/stop environment using standard start/stop
software. It uses an internal one-megabyte cache memory as an electronic tape buffer that
decouples the physical and logical tape operations. The primary function of the cache memory
is to provide higher performance on systems that are not able to stream.
The drive has three main functional assemblies: the interface, the electronics, and the servo
mechanism. These assemblies interact to accomplish the various functions performed by the
drive.
1.3.1 Interface
The SCSI 2 interface translates bus commands into tape-drive-executable commands. The
interface also translates tape drive data and status signals into the correct bus format.
1.3.2 Electronics
A Z8002 microprocessor controls all necessary logic functions relating to read/write, servo
control, cache memory, and the transfer of data and commands in the drive. An 80188
microprocessor operates in synchronous with the Z8002 control communications with the
external SCSI bus.
The SCSI bus transmits data to the TSZ07, which writes it on the tape with the PE and
GCR recording methods at 1600 and 6250 bpi. Nine tracks (8 data, 1 parity) are written
simultaneously across the width of the tape.
The TSZ07 reads recorded data from the tape and transfers it to the SCSI bus. To perform
this function, a microprocessor interprets commands from the interface; accelerates and
decelerates the tape; positions it at the read/write head; controls formatting; and provides
status to the host.
The TSZ07 is self-loading. The user inserts a reel of tape into the front panel opening, and
presses the LOAD switch. Then, the drive automatically threads the tape around the tension
sensor, across the read/write head, and around the take-up hub. Finally, the drive tensions
the tape, and positions the tape at the Beginning of Tape (BOT) .
The drive has automatic error recovery capability. Errors detected during a write operation
result in the tape being automatically backspaced, erased, and the data rewritten on a faultfree section of tape. The drive corrects read errors "on the fly" for up to two tracks in GCR
and one track in PE. The drive automatically backspaces and retries multi-track read errors
that are not correctable.
Standard features of the drive electronics include:
•
Configuration parameters stored in non-volatile memory
•
One megabyte of cache memory
•
Custom analog read amplifier chip for each track
•
Extensive use of large scale integration (LSI) and surface mount technology
•
Solid-state tension transducer
1–10 Introduction
1.3.3 Servo Mechanism
The mechanical assemblies of the drive are managed by the microprocessor. These assemblies
control tape loading and unloading and maintain correct tape tension.
The drive mechanism uses two direct-drive DC torque motors, a tachometer assembly that
senses tape speed and position, and a servo-drive that eliminates the need for a capstan.
Tape movement is controlled primarily by the take-up servo and the tachometer. The tape
path has five roller guides, a dual-gap head, and a tape cleaner. The roller guides, positioned
on each side of the head, are designed to minimize friction, skew, and tape-width variations.
Standard features of the drive mechanism include:
•
Unbuffered tape path
•
Velocity tachometers mounted on motors
•
Brushless dc blower motor for loading and cooling
1.4 Access Positions
There are two ways of gaining access to the drive:
•
The operator access position, which provides operator access to the tape path
•
The service access position, which provides field service access to the internal electronic
and mechanical parts of the drive
Throughout this manual it is expected that the reader is a trained, qualified technician who
is familiar with both ways of accessing the drive. Accessing the tape drive is described in
Chapter 5.
Introduction
1–11
Chapter 2
Operation
This chapter defines the use of all controls and indicators of the TSZ07 and explains how to
load and unload tapes.
2.1 Controls and Indicators
The controls and indicators are described in Table 2–1 and shown in Figure 2–1.
NOTE
The function of the front panel controls and indicators described in Table 2–1
is for normal operation. The control panel is also used in selecting service
aids for configuring the drive, testing various Field Replaceable Units (FRUs)
and troubleshooting. For details on the service aids and how to use the
control panel in the service aid mode of operation, refer to Chapter 4.
Operation 2–1
Table 2–1: TSZ07 Controls and Indicators
Item
Function
AC Power Switch
Located at the rear of the drive (not shown in Figure 2–1). When set to the on
(1) position, ac power is applied to the tape drive power supply. When set to off
(0), ac power is disconnected from the power supply. This switch must be on to
operate the drive.
CAUTION
Once the drive is installed and running on a host
system, setting the switch to off (0) may interrupt
the normal operation of the system.
When ac power is applied to the power supply, the drive initializes, causing the
following to occur:
1.
2.
3.
4.
Load Rewind, Unload, Online, Wrt En Test, and Density Select indicators
flash and TESTING appears on the display.
TESTING changes to TESTPASS and the indicators continue to flash.
Indicators extinguish.
Display goes blank, then the Unload and On/Off indicators light showing
that the tape drive is ready for loading tape operation.
Front Door
When opened, provides access to the supply hub for the insertion or removal
of a reel of tape. Also provides access to the manual release switch. The front
door must be closed for operation.
Manual Release
Switch
When pressed, engages/retracts the supply hub pawls to enable the loading
/unloading of a reel of tape. Used when performing the procedure for manually
loading/unloading a reel of tape.
Load Rewind
Indicator
When flashing, indicates a tape is being loaded.
Unload
Indicator
When flashing, indicates that a tape is being unloaded. When lit, indicates that
a tape is unloaded. When not lit, indicates that there is no tape loaded in the
drive.
Online
Indicator
When lit, indicates the drive is on line. When extinguished, the drive is off
line.
Wrt En Test
Indicator
When lit, indicates that the loaded tape has a write-enable ring.
Density Select
Indicator
Flashes along with all other indicators during initialization, when the AC
Power Switch or ON/OFF Switch is set to on.
Alphanumeric
Display
Displays status and error messages during normal operation and while in the
service aid mode as described in Chapter 4.
On/Off
Indicator
When lit, indicates that dc power is applied to the drive circuits and that
the drive is ready to operate. When not lit, indicates that the dc power is
disconnected.
2–2 Operation
Table 2–1 (Cont.): TSZ07 Controls and Indicators
Item
Function
ON/OFF
Switch
When pressed once, connects dc power throughout the drive and lights the
On/Off indicator. When pressed again, disconnects dc power and turns off the
indicator.
CAUTION
Once the drive is installed and running on a host
system, operating this switch may interrupt the
normal operation of that system.
When set to on, the drive initializes causing the following to occur:
1.
2.
3.
4.
DENSITY
SELECT
Switch
Load Rewind, Unload, Online, Wrt En Test, and Density Select indicators
flash and TESTING appears in the display.
TESTING changes to TESTPASS and the indicators continue to flash.
Indicators extinguish.
Display goes blank, then the Unload and On/Off indicators light showing
that the drive is ready for loading tape and normal operation.
This switch functions only when the drive is off line and tape is loaded at BOT,
or when no tape is loaded.
When pressed, selects the operating density that tapes are to be written in.
This causes the drive to select the next available density as the operating
density and display the selection on the alphanumeric display. For example,
if the drive powers-up with a default density of 1600, and the Density Select
switch is pressed, the drive switches to the 6250 density and the message CMD
6250 appears at the alphanumeric display.
Using this switch to select an operating density (commanded density) different
from the one selected by the drive as a result of reading an identification burst
(found density) does not necessarily cause the drive to begin immediately using
the newly commanded density. The identification burst on the tape always
determines the operating density — unless the condition is met as explained
under "Automatic Density Selection" in the TSZ07 Tape Drive Installation
/Owner’s Manual.
WRT EN TEST
Switch
This switch functions only when the drive is off line. When pressed, provides
access to the TSZ07 service aids explained in Chapter 4. (It does not write
enable the drive.)
ONLINE
Switch
When pressed, places the drive on line and causes the Online indicator to light.
If the drive is already on line, pressing this switch cause the drive to go off line
and the Online indicator to extinguish.
Operation 2–3
Table 2–1 (Cont.): TSZ07 Controls and Indicators
Item
Function
UNLOAD
Switch
Causes the drive to unload tape at any point. While the tape is unloading,
the Unload indicator flashes and the message UNLOAD’G appears on the
alphanumeric display. When unloading is completed, the Unload indicator
lights and the message UNLOADED appears on the alphanumeric display for a
short time.
Before the tape can be unloaded, the drive must be placed in the offline mode.
When this is done (by pressing the ONLINE switch), all cache-resident data is
written to tape before the drive actually goes off line.
The UNLOAD switch may be pressed while the drive is loading a tape. If so,
the loading process is halted, the message LD ABORT is displayed, and the
tape is unloaded.
LOAD/REWIND
Switch
This switch only functions when the TSZ07 Tape Drive is off line (Online
indicator is not lit.)
When pressed, causes the drive to load a tape and position it at BOT, or, when
a tape is already loaded, to rewind it to BOT. When a tape is being loaded,
the message LOADING appears in the alphanumeric display. Once the tape is
loaded, the tape density is displayed. The tape density messages are ID 1600,
ID6250, AND BLANK. If the loaded tape is written in an invalid format, the
message ID UNKWN is displayed.
Pressing this switch while the drive is off line (Online indicator is not lit) and
the tape is at BOT causes a density message to display for five seconds.
2–4 Operation
Figure 2–1: TSZ07 Controls and Indicators
Operation 2–5
2.2 Density Selection
The density at which the drive is reading or writing, is termed the operating density. When
the drive is active, it communicates the operating density to the alphanumeric display. The
operating density is set in one of four ways:
•
At power-up by the drive
•
Commanded by the system through the interface
•
Found by the drive automatically when it reads the identification burst from a recorded
tape
•
Commanded by an operator at the front panel
2.2.1 Power-Up Density Selection
At power-up the drive reads its non-volatile memory to determine the default density and
sets this as the operating density. The default density is a configuration option that can be
changed with Service Aid 142 as described in Chapter 4.
2.2.2 Host Density Selection
Selecting the operating density through the interface is a function of the host system software
and the interface itself.
2.2.3 Automatic Density Selection
The drive automatically selects the operating density when it reads an identification burst
from a tape. When a load is completed with the drive off line, or after a rewind with the
drive off line, the density detected (found density) by the drive appears in the alphanumeric
display for approximately five seconds. The message displayed is either, ID 6250 or ID 1600.
If the drive does not detect an allowable density, it displays either the message BLANK or
the message ID UNKWN. The BLANK message indicates that the tape is blank. The ID
UNKWN message indicates that the tape was written in a format that the drive cannot read.
The drive can prevent writing in a density commanded by an operator or the host under one
condition. If a read from BOT is followed immediately by a write command in a different
density, the drive will only write in the density determined by the identification burst found
on the tape (found density); in other words, it ignores the command to append data in a
different density. However, if a rewind precedes the write command, or if a write is the first
tape motion command after a tape is loaded, the commanded density becomes the operating
density and the drive ignores the found density. This feature ensures that an operator or the
system cannot write a mixed density tape.
2.2.4 Operator Density Selection
The operating density may be selected by an operator at the front panel as previously
described in Table 2–1.
2–6 Operation
2.3 Activity Messages
The drive uses the alphanumeric display to provide status messages to the user. Table 2–2
lists the messages normally displayed during operation.
Table 2–2: Operating Messages
Operation
Message
Density Read
ID (density)
Density selected
CMD (density)
Erase fixed
ERA (density)
Erase security
ERAS (density)
Erase variable
ERAV (density)
Load
LOADING
Read forward
FRD (density)
Read reverse
RRD (density)
Rewind
REWIND’G
Unloading
UNLOAD’G
Unload finished
UNLOADED
Write block
WRT (density)
Write file mark
WFMK (density)
Operation 2–7
2.4 Automatic Tape Loading
To automatically load a tape in the TSZ07, proceed as follows:
CAUTION
Lifting the top cover when the tape drive is powered on stops tape motion
and prevents tape from loading or unloading.
1. If you are using a new reel of tape, or the leader of the tape is damaged, crimp the end
of the tape. Tape crimping tool 47-00038-00 is available from Digital.
2. Open the door by gently pressing down on the center of the door.
3. Make sure the tape is completely wound on the reel; and, if you intend to write data to
the tape, ensure that a write-enable ring (shown in Figure 2–2) is installed on the reel.
Figure 2–2: Write-Enable Ring
4. Place the tape reel on the supply hub with the write-enable ring side of the reel down.
The reel should lie evenly on the supply hub, as shown in Figure 2–3.
2–8 Operation
Figure 2–3: Tape Reel Insertion
5. Close the front door.
6. Press the LOAD/REWIND switch.
NOTE
You can load the tape with the front door open by pressing the LOAD
/REWIND and DENSITY SELECT switches simultaneously.
During loading, the Load/Rewind indicator flashes and the message LOADING appears
in the alphanumeric display. When loading finishes, the tape density message appears.
The Wrt En Test indicator also lights if a write-enable ring is installed.
7. Press the ONLINE switch. If the Online indicator lights, the drive is on line and ready
for commands.
Operation 2–9
2.5 Manual Tape Loading
To load tape manually, proceed as follows:
1. Place the drive in the operator access position (procedure described in Chapter 5).
2. Make sure the tape is completely wound on the reel; and, if you intend to write data to
the tape, ensure that a write-enable ring (shown in Figure 2–2) is installed on the reel.
3. Place the tape reel on the supply hub with the write-enable ring side of the reel down.
The reel must lie evenly on the supply hub.
4. While pressing the manual release switch (shown in Figure 2–1), rotate the supply hub
clockwise until the hub locks. The hub has three pawls that raise and hold the tape reel
in place.
5. Thread the tape along the tape path shown in Figure 2–4.
6. Move the packer arm away from the take-up hub. Wrap the tape clockwise around the
take-up hub until the end of the tape is held by the next layer, and then turn the hub
clockwise at least five complete turns. Gently place the packer arm against the take-up
hub.
7. Check that the tape is seated correctly in the tape guides and against the read/write head.
8. Close the front door and top cover.
9. Press the LOAD REWIND switch. While loading, the Load/Rewind indicator flashes and
the message LOADING appears on the alphanumeric display. The Write-Enable indicator
also lights if a write-enable ring is installed. If the loaded reel of tape has recorded data,
a tape density message appears on the display when the tape loading is complete.
10. If the manual load is unsuccessful, the Load/Rewind indicator flashes and a message
appears on the alphanumeric display. Repeat steps 1 through 11.
11. Return the drive to the normal operating condition.
2–10 Operation
Figure 2–4: TSZ07 Tape Path
NOTE
When performing step 7, ensure that the tape is wound five or more turns on
the take-up reel, or else the tape may not manually load.
Operation 2–11
2.6 Unloading Tape Automatically
1. Check that the Online indicator is off (if not, press the ONLINE switch) and that the
front panel door is closed. When the ONLINE switch is pressed, buffered commands are
synchronized. Synchronization is a process that writes all data from cache to tape before
executing the next command.
2. Press the UNLOAD switch. While the tape is unloading, the Unload indicator flashes
and the message UNLOAD’G appears at the alphanumeric display.
3. Open the front panel door when the Unload indicator stops flashing and stays lit and the
message UNLOADED appears on the alphanumeric display (for several seconds).
4. Remove the tape reel.
NOTE
If the drive does not automatically unload a tape, it may be necessary to
manually unload it as described in Section 2.7.
2.7 Unloading Tape Manually
To unload a tape manually, proceed as follows:
1. Place the drive in the operator access position (procedure described in Chapter 5).
2. Rotate the supply reel counterclockwise to wind the tape on the reel.
3. When all the tape is on the supply reel, press the manual release switch (shown in
Figure 2–1) and simultaneously rotate the supply hub counterclockwise until the hub
unlocks.
4. Remove the tape reel.
2–12 Operation
Chapter 3
Maintenance
This chapter explains how to perform all required preventive maintenance to the tape drive,
which is limited to regular cleaning of the tape path, sensors, and air filter.
CAUTION
It is not necessary to turn off ac power to perform preventive maintenance.
However, if the ac power needs to be turned off on the tape drive, the
system must be shut down first to prevent an abnormal interruption of system
operation.
3.1 Tape Path
The read/write head should be cleaned every 8 hours; the rest of the tape path should be
cleaned every 40 hours. To clean the read/write head and tape path related items, proceed
as follows:
CAUTION
Do not apply a cleaner directly to the item to be cleaned, even if the manufacturer of the cleaner states to do so. Always apply the cleaner to a swab or
wipe first. Cleaning agents can dissolve the lubricants in precision bearings.
•
Clean the tape path using the cleaning agent applied to a lintless swab. Use the agent
contained in the tape cleaning kit (P/N 22-00012-00).
•
Apply the cleaning agent to a lintless swab or wipe and then clean the read/write head,
tape cleaner, roller guides, the three supply hub pawls, take-up hub, and packer arm
roller. The location of these components is shown in Figure 3–1.
Maintenance 3–1
Figure 3–1: Location of Tape Path and Sensors
3.2 Sensors
The EOT, BOT, and tape-in-path transmitter and receiver (shown in Figure 3–1) should be
cleaned every 40 hours. Clean the sensors by gently wiping the face of the LED transmitter
and receiver with a lintless swab. No cleaning solution is required.
3–2 Maintenance
3.3 Air Filter
The air filter is located at the inlet of the intake air duct (see Figure 3–2), and should be
cleaned every six months. To clean the filter, remove the filter and clean it by blowing
compressed air or vacuuming in the opposite direction of the airflow.
To install the air filter, always insert the air filter through the front panel opening and ensure
that the filter flexes properly into position over the intake air duct inlets (see Figure 3–2).
CAUTION
If the air filter is not properly seated over the intake air duct inlet, foreign
matter may be drawn into the tape drive, effecting operation and causing
damage to an installed magnetic tape and other components in the tape path.
Figure 3–2: Location of Air Filter
Maintenance 3–3
Chapter 4
Troubleshooting
This chapter provides the following:
•
A description of the self-diagnostic and troubleshooting capabilities designed into the
TSZ07 Tape Drive
•
An explanation of how tape processing errors and tape drive faults are reported and how
to use the diagnostic aids (referred to as service aids) resident in the TSZ07 firmware
•
A list of error recovery procedures
External diagnostics should be run on all systems where the TSZ07 is connected to a
KZQSA. For information on running MicroVAX Diagnostic Monitor (MDM) and other external
diagnostics, refer to the TSZ07 Tape Drive Installation Manual.
4.1 Power-on Diagnostics
The power-on diagnostics are ROM-resident tests that verify the integrity of the TSZ07
hardware and firmware at power-up. If the diagnostics detect a fault, a Fault Symptom
Code (FSC) appears in the alphanumeric display (display) located on the control panel.
The power-on diagnostics are initialized when power is applied to the drive using the AC
Power Switch or the ON/OFF Switch. When initialized, the power-on diagnostics begin by
illuminating the front panel indicators and display segments for several seconds. Then the
message TESTING flashes in the display throughout the remainder of the tests. Once the
power-on diagnostics complete successfully, the UNLOAD indicator lights and the message
TESTPASS appears for several seconds in the display.
Normally, the power-on diagnostics are run with the front panel door closed. If the drive
is powered-on with the door open, the message DOOR AJAR appears. Pressing the LOAD
/REWIND and the DENSITY SELECT switches simultaneously, after the DOOR AJAR
message appears, allows the power-on diagnostics to be completed.
Troubleshooting
4–1
4.2 Error Reporting
Error conditions that occur during normal operation cause a message to appear in the display
along with an FSC. Depending on the class of error detected, the error is also reported to the
system.
4.3 Error Classification
There are four classes of errors based on the severity of the problem:
•
Soft
•
Medium
•
Medium hard
•
Hard
4.3.1 Soft Error
Soft errors are usually caused by an operator or a defective tape, and will prevent the drive
from being loaded and placed on line. Soft errors are not reported to the system. However,
an error message and an FSC are posted in the display.
4.3.2 Medium Error
Medium errors occur on the interface and usually do not involve hardware failures. These
errors may be reported to the system. In any case, an error message and an FSC are posted
in the display.
4.3.3 Medium-Hard Error
Medium-hard errors are machine failures that could result in data corruption if the operation
is allowed to continue. Medium-hard errors are reported to the system. An error message
and an FSC may appear in the display.
4.3.4 Hard Error
Hard errors may cause media damage if the tape and servos are not stopped. These errors
usually cannot be recovered at the drive, except by cycling the power switch. Hard errors are
considered catastrophic to the drive and cause the following actions:
•
Display of an error message and an FSC
•
Transmission of a hard failure report to the host
•
Disabling of the TSZ07 servos
•
Braking reel motors to a stop
•
Release of tape tension
4–2 Troubleshooting
4.4 Fault Symptom Codes
The TSZ07 is capable of detecting operator errors and machine faults. When the drive detects
an operator error or machine fault, a Fault Symptom Code (FSC) and Fault Message (FM)
appear in the display (Table 4–1 lists the FSCs.) Error Recovery Procedures (ERP) should
then be performed to correct the error or fault. When several ERPs are identified, try the first
ERP, then check the drive for the same or a new FSC before trying the second, third, and so
on, of the recommended ERPs for the FSC. In some cases, the ERP requires the replacement
of a Field Replaceable Unit (FRU). When several FRUs are identified as possible causes of an
FSC, replace the first FRU, then check the drive for the same or a new FSC before replacing
the next FRU. Repeat this procedure for the remaining FRUs identified as possible causes.
The following pages contain tables that help decode the FSCs. Table 4–1 lists a code number
for the FM, ERP, and FRUs associated with each FSC, as well as a description of the FSC.
Table 4–2 decodes the FM column. Table 4–3 decodes the ERP column, and Table 4–4 decodes
the FRU column.
Table 4–1: Fault System Codes (FSC) with Related FM, ERPs and FRUs
FSC
Error or Fault Description
01
02
03
04
05
Z8002 CPU, ROM, or RAM
CPC parity error detection
CPC register
SPC or CPC interrupt
80188 RAM data path to SPC or CPC
FIFO
Inter-processor interrupt lines
Communications buffer arbitration
HSB to SPC or CPC data transmission
SPC or CPC to HSB data transmission
DBC interrupt absent
Z8002 RAM
Z8002 CPU
CIO register
CIO timer accuracy
NVRAM
Z8002-side communication buffer
HSB RAM
HSB to Z8002 parity
DMA register
DMA scratch RAM
DMA auto-test
HSB to cache parity
HSB to cache data transfer
Cache to HSB data transfer
CDM FIFO loopback
Write ID failure
Write file mark
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
FM
Table 4-2
ERP
Table 4-3
FRU
Table 4-4
22
22
22
22
22
3,
3,
3,
3,
3,
5,
5,
5,
5,
5,
6
6
6
6
6
1
1
1
1
1
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
3,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
5,
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2, 3, 1
2, 3, 1
Troubleshooting
4–3
Table 4–1 (Cont.): Fault System Codes (FSC) with Related FM, ERPs and FRUs
FSC
Error or Fault Description
FM
Table 4-2
ERP
Table 4-3
FRU
Table 4-4
1C
1D
1E
1F
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
50
51
52
53
54
55
56
57
58
59
5A
5B
5C
5D
5E
5F
60
CPC rewind interrupt
GCR ARA ID burst not written
Z8002 ROM checksum
Block size mismatch
Read CRC mismatch
Single-track error correction
Two-track error correction
Write formatter overrun detection
Write formatter CRC detection
No GAPOUT signal
No RIRQ signal
No WIRQ signal
Hard error during loopback test
Write command reject
Write CRC mismatch
Data overrun
Cache RAM
Parity error on corrected data
Single-track error correction
Two-track error correction
Unload tape timeout
No door lock (solenoid energized)
No reel-seated detection
No bell crank
Load retries exceeded
Tape reel may be upside-down
Tape stuck
Tape slippage on take-up hub
Tape out of tape-in-path sensor
No BOT marker
No tachometer phasing
Tension ADC null
TACH ULA check PAL
Illegal servo loop state
Motor position
Fine-line tach
EOT/BOT position error
Forward speed too fast
Forward speed too slow
Reverse speed too fast
Reverse speed too slow
One millisecond overrun
Servo positioning routine
Servo interface routine
EOT/BOT interrupt
No once-around tachometer
No supply reel movement with tape
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
17
6
4
17
9
7
5
9
9
8
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
7, 3,
8, 3,
3, 5,
9, 2
8, 5,
8, 9,
9, 2,
—
2, 3,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
9, 2,
2, 3,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
3, 5,
9, 2,
1
2, 3, 1
1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
2, 3, 1
18, 19
21, 22
20
23
—
18, 19
28
—
—
17
12, 4, 1
3, 2
12, 4, 1
1
12,4
12, 13, 1
17
4, 12
4, 12
4, 12
4, 12
1
1
1
17
13, 4
12, 13
4–4 Troubleshooting
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
5, 6
5, 6
6
6
5, 6, 12
3, 6
5, 6
6
6
6
6
6
3, 5, 6
5 ,6
6
6
6
6
6
6
6
6
6
3, 5, 6
Table 4–1 (Cont.): Fault System Codes (FSC) with Related FM, ERPs and FRUs
FSC
Error or Fault Description
FM
Table 4-2
ERP
Table 4-3
FRU
Table 4-4
61
62
63
64
65
66
67
68
69
6A
6B
80
81
82
83
84
85
86
87
88
89
8A
8B
8C
8D
8E
8F
90
91
92
93
94
95
96
98
B
B1
B2
B3
B4
C0
C1
C2
C3
C4
C5
C6
No supply reel movement at load
No spooling at load
No tension sensor at spool
Fine-line count out of specification
Motor calibration required
Head calibration required
Motor current limit
Servo board
Tension sensor dead
Tension sensor installed backward
Tension sensor detected stuck tape
No WIRQ interrupt
Reinstruct error at write
Reinstruct error at read
Write command reject
Read command reject
No write voltage at write
Write or erase voltage at read
Write CRC
Write overrun
No GAPOUT at write
No RIRQ with GAPOUT at write
Data block greater than 64k read
Cache data overrun at read
Hard error at write
Two-track error corrected at write
One-track error corrected at write
Block size error at write
CRC mismatch at write
CRC mismatch at read
Block sequence error at write
Non-standard format read
Hardware/firmware
Hardware/firmware error
Physical end of tape
Noise error
Firmware error
Internal bus
Hardware/firmware
Noise error
Firmware error
DBC interrupt error
Hardware malfunction
Invalid host type
File mark detected
Undefined parity error
Block sequence error
17
17
17
17
13
14
17
17
17
17
5
16
16
15
16
15
16
15
16
16
16
16
11
15
16
16
16
16
16
15
16
15
16
16
16
23
23
23
23
23
18
18
18
18
18
18
18
3, 5, 6
3, 5, 6
3, 5, 6
9, 2, 3, 5, 6
10, 5, 6
10, 5, 6
3, 5, 6
3, 5, 6
5, 6
5, 6
1, 2
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
1, 3, 5, 6
1, 3, 5, 6
4, 5, 6
3, 5, 6
1, 3, 5, 6
1, 3, 5, 6
1, 3, 5, 6
1, 3, 5, 6
1, 3, 5, 6
1, 3, 5, 6
3, 5, 6
1, 2, 3, 5, 6
3, 5, 6
3, 5, 6
2, 3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
3, 5, 6
11, 3, 5, 6
3, 5, 6
3, 5, 6
12
13, 4
14, 3, 2
1
1, 16
1
4
4
2, 14, 3
14
—
2
1
1
1, 2
1, 2
3, 2, 6, 1
3, 2, 1
2, 1
1
3, 6, 2, 1
3, 6, 2,1
1
1, 2
2
1, 2, 3
1, 2, 3
2
2
2
1
2, 3
1
1
17
1
1
1
1
1
1
1
1
1
1
1
1
Troubleshooting
4–5
Table 4–1 (Cont.): Fault System Codes (FSC) with Related FM, ERPs and FRUs
FSC
Error or Fault Description
C7
C8
C9
CA
CB
CD
CE
E0
E1
E2
E3
Communication buffer interrupt
Read retries exceeded
Unrecognizable format
Cache to HSB CRC
I/O bus parity
HSB to cache parity
HSB to Z8002 parity
80188 firmware error
80188 kernel error
SCSI bus parity error
Cipher interface commanded overlap
error
Cipher interface write overrun
Cipher interface illegal command
E4
E5
FM
Table 4-2
ERP
Table 4-3
FRU
Table 4-4
18
18
18
18
18
18
18
19
19
12
19
3,
1,
1,
3,
4,
3,
3,
3,
3,
4,
4,
1
3, 2, 1
1, 2, 3
1, 2
1
1
1
1
1
1
1
19
19
4, 13, 5, 6
4, 13, 5, 6
5, 6
3, 5, 6
3, 5, 6
5, 6
3, 5, 6
5, 6
5, 6
5, 6
5, 6
13, 3, 5, 6
13, 5, 6
Table 4–2: Fault Messages (FM)
Number
Code†
Description
Number
Code†
Description
1
Write retries exceeded
12
Bus parity error
2
End of media
13
Requires motor test 525
3
Door ajar
14
Requires head test 513
4
Hub seat
15
Read error
5
Tape stuck
16
Write error
6
No door lock
17
Motor fault
7
Reel upside-down
18
Machine error
8
No BOT
19
Interface error
9
Load error
20
Timeout error
10
Illegal status
22
PUST
11
Block size error
23
Trap
†These number codes are referred to in the FM column of Table 4-1.
4–6 Troubleshooting
1
1
Table 4–3: Error Recovery Procedure (ERP)
Number
Code †
Description
1
Clean head and ensure tape path is free of debris.
2
Change tape reel and try again the operation that failed.
3
Cycle power to run the power-on diagnostics and try again the operation that failed.
4
Shut off power, reseat interface connectors, switch on power, and try again the operation
that failed.
5
Replace indicated FRU and try again the operation that failed.
6
Call field service.
7
Close the front door and try again the operation that failed.
8
Ensure a reel of tape is seated correctly on the supply hub.
9
Check the condition and length of tape leader; recrimp if necessary.
10
Run requested service aid and try again.
11
Check to ensure command sequence is correct.
12
Use "Loading the High-Static Tape" procedure.
13
Check the I/O cables, termination, and configuration parameters.
†These number codes are referred to in the ERP column of Table 4-1.
Troubleshooting
4–7
Table 4–4: Field Replaceable Units (FRU)
Number
Code†
Description
1
Interface circuit board, single-ended SCSI(P/N 29-28477-01), differential-ended SCSI (P/N
29-30410-01)
2
Read/write circuit board (P/N 29-28480-01)
3
Head circuit board (P/N 29-28478-01)
4
Servo circuit board (P/N 29-28479-01)
5
Front panel display circuit board (P/N 29-28468-01)
6
Read/write head (P/N 29-28474-01)
7, 8
Front panel (P/N 29-28467-01)
9, 10
Control switches (P/N 29-28463-01)
11
Front door (P/N 29-28466-01)
12
Supply motor (P/N 29-28470-01)
13
Take-up motor (P/N 29-28469-01)
14
Tension sensor (P/N 29-28471-01)
15
Roller guides 1, 3, 4, 5 (1: P/N 29-24101-00; 3,4, & 5: P/N 29-24081-00)
16
Power supply (P/N 29-28461-01)
17
EOT/BOT sensors (P/N 29-28649-01)
18
Tape-in-path transmitter (P/N 29-28483-01)
19
Tape-in-path receiver (P/N 29-24093-00)
20
File protect/reel seat sensor
21
Front door lock (P/N 29-28476-01)
22
Top cover interlock (P/N 29-28476-02)
23
Hub lock (P/N 29-28475-01)
24
Take-up hub
25
Supply hub (P/N 29-24077-00)
26
Packer arm
27
Mounting hardware kit
28
Blower (P/N 29-28465-01)
†These number codes are referred to in the FRU column of Table 4-1.
4–8 Troubleshooting
4.5 Service Aids
The TSZ07 service aids provide the capability of configuring the drive, testing various FRUs,
and troubleshooting. There are three types of service aids:
•
Tape Unloaded Service Aids
•
Tape Loaded Service Aids
•
Special Service Aids
Section 4.5.1 describes how to select the service aids, and Section 4.5.2 through Section 4.5.4
describe the three types of service aids.
4.5.1 Selecting Service Aids
The service aids are selected from the front panel only when the drive is off line.
With the drive off line, the front panel switches take on the characteristics of a number
keypad with the numbers 1 through 5 assigned as shown in parenthesis in Figure 4–1.
Figure 4–1: Assigned Numbers of Control Panel Switches
The service aids are initiated by entering a six-digit code with the front panel switches. The
code sequence is 45XXX5, with the three X’s representing the code of the desired service aid.
As each digit is entered, it appears in the display.
The following steps describe how to access a service aid. Steps two through four must be
performed within three seconds, or the drive ignores the request to initiate a service aid.
1. Press the WRT EN/TEST switch (4).
2. Press the DENSITY/SELECT switch (5).
3. Press the three switches that represent the service aid to be executed. (For example: For
Service Aid 125, you would press the LOAD/REWIND switch (1), the UNLOAD switch
(2), and the DENSITY/SELECT switch (5).
Troubleshooting
4–9
4. Press the DENSITY/SELECT switch (5) to start the service aid.
A service aid may be exited by pressing the WRT EN/TEST switch 4. If a nonexistent
service-aid code is entered, the drive ignores it.
NOTE
For ease of reference in the remainder of this chapter, the control panel
switches will be referred to as switch 1, 2, 3, 4 or 5 as identified in Figure 4–1.
4.5.2 Tape-Unloaded Service Aids
The tape-unloaded service aids can only be executed without the tape loaded. These
service aids are listed below and described in Sections 4.5.2.1 through 4.5.2.6.
•
Service Aid 111 (Servos)
•
Service Aid 125 (Firmware ID)
•
Service Aid 131 (Sensors)
•
Service Aid 132 (Solenoids)
•
Service Aid 134 (Blower)
•
Service Aid 142 (Configuration)
4.5.2.1 Service Aid 111 (Servos)
Service Aid 111 checks the take-up and supply motors and their servo circuits. As soon as
this service aid begins, MODE ? appears in the display. Three test options are available:
•
Auto oscillation (AUTO OSC),
•
Supply motor (MAN SPLY)
•
Take-up motor (MAN TKUP)
While this service aid is active, the front panel switches select and start the tests as described
in Table 4–5.
Table 4–5: Service Aid 111 Test Selection
Switch
Function at MODE ?
1
Selects AUTO OSC test.
2
Selects MAN SPLY test.
3
Selects MAN TKUP test.
4
Exits the service aid.
5
Starts the selected test.
During the execution of any of the three tests the front panel switches function as described
in Table 4–6.
4–10 Troubleshooting
Table 4–6: Service Aid 111 Switch Functions
Switch
Function During Test
1
Causes supply motor to rotate clockwise (MAN SPLY test) or the take-up motor to rotate
counterclockwise (MAN TKUP).
2
Causes the take-up motor to rotate clockwise (MAN TKUP test) or the supply motor to
rotate counterclockwise (MAN SPLY) test.
3
Reverses motor direction.
4
Exits the service aid.
5
Exits any test and returns to the MODE ? prompt.
At the MODE? prompt, the oscillation test (Auto OSC), the supply motor test (MAN SPLY), or
the take-up motor test (MAN TKUP) may be selected by pressing switch 1, 2 or 3, respectively.
After selecting the test, switch 5 must be pressed to start the test.
The auto oscillation test (AUTO OSC) cycles the take-up and supply motors in alternate
directions. The supply motor test (MAN SPLY) and the take-up motor test (MAN TKUP)
operate their respective motors in either the clockwise or counterclockwise direction. The
initial motor speed is zero. By pressing continuously on either switch 1 or 2, the speed
increases to the maximum capability of the motor in the direction specified in Table 4–6.
Pressing continuously on the other switch (2 if 1 was pressed initially, or vice versa) decreases
the speed to zero, reverses direction, then increases the speed to maximum in the new
direction.
4.5.2.2 Service Aid 125 (Firmware ID)
Service Aid 125 displays the revision levels of the firmware for the Z8002 and 80188
microprocessors and the type of interface. Three messages are displayed during this service
aid:
NOTE
This service aid is used when a tape is not loaded. Service Aid 225 may be
used when a tape is loaded.
1. DEV REV for the Z8002 revision level
2. I/F REV for the 80188 revision level
3. I/F TYPE for the type of interface
During this service aid the front panel switches function as described in Table 4–7.
Troubleshooting 4–11
Table 4–7: Service Aid 125 Front Panel Switches
Switch
Function
1
Selects the next message prompt.
2
Selects the previous message prompt.
3
Displays the revision level or interface type, depending on which message type is selected.
4
Exits the service aid.
5
No function.
4.5.2.3 Service Aid 131 (Sensors)
Service Aid 131 checks the status and operation of the file protect/reel seat, BOT, EOT, and
tape-in-path sensors.
The file protect/reel seat sensor is tested by placing a tape reel with a write-enable ring on
the supply hub and starting the test. The test begins by slowly rotating the supply hub. As
the supply hub rotates, the Unload indicator flashes twice when the reel seat tab passes the
sensor. The Unload indicator flashes once when the file protect tab passes the sensor.
The tape-in-path, BOT, and EOT sensors are tested by passing a length of tape with both
BOT and EOT reflective markers through the tape path. While the service aid is running, the
letters "B," "E," and "T" appear in the display. When the tape reaches the tape-in-path sensor,
the "T" disappears from the display. When the tape reaches the BOT and EOT sensors, the
"B" and "E" disappear from the display. When the reflective markers move past the BOT and
EOT sensors, the "B" and "E" reappear.
Service Aid 131 can also be used to check the sensitivity of the BOT and EOT sensors to
shiny tape, which can produce false BOT and EOT signals. Place a dull, non-shiny covering
over the reflective material opposite the BOT and EOT sensors. Place a piece of shiny tape
in the tape path and hold it taut. Use a pencil or similar object to disturb the tape near the
sensors. If a "B," "E," or "S" does not appear in the display, the sensor passes. If only an "S"
appears, the sensors are acceptable but marginal. If a "B" or "E" appears, shiny tape should
not be used, or else the sensors should be replaced.
4.5.2.4 Service Aid 132 (Solenoids)
Service Aid 132 cycles the supply hub and front door lock solenoids. When the solenoids are
energized with the front door closed, LOCKED appears in the display. When the solenoids
are energized with the front door opened, UNLOCKED appears at the display.
Pressing switch 1 stops the cycling action and the message SW CLOSD appears in the display.
The switch must be pressed a second time to resume the cycling action. If the front door is
opened when the switch is pressed, the message SW OPEN appears.
4–12 Troubleshooting
4.5.2.5 Service Aid 134 (Blower)
Service Aid 134 allows the blower motor to be controlled from the front panel. Switch 1
switches the blower off and on; its status appears in the alphanumeric display as BLWR ON
and BLWR OFF. Switch 4 exits the service aid.
4.5.2.6 Service Aid 142 (Configuration)
Service Aid 142 allows the drive configuration parameters to be reviewed and changed.
Table 4–8 lists the front panel switch functions in the Review Mode.
NOTE
This service aid is used when a tape is not loaded. If a tape is loaded, use
Service Aid 242.
Table 4–8: Front Panel Switch Functions in Review Mode
Switch
Function in Review Mode
1
Displays the next parameter.
2
Displays the previous parameter.
3
Displays the value set for the current parameter and enters the drive into the Change
Mode where parameters may be changed.
4
Exits the service aid without changing any parameters in the non-volatile memory.
However, the parameters are changed in RAM, and stay changed until the drive is
switched off.
4&5
Pressing and holding switch 5 and then pressing switch 4 saves the new parameter
values in non-volatile memory and exits the service aid. The message SAVING appears
in the display.
5
No function.
Pressing switch 3 enters the drive into the Change Mode, which redefines the control panel
switches and allows parameters to be changed. Table 4–9 describes the function of the front
panel switches while in the Change Mode.
Table 4–9: Front Panel Switch Functions in Change Mode
Switch
Function in Change Mode
1
Selects yes and no for yes/no parameters or increments parameter value3 .
2
Selects yes and no for yes/no parameters or decrements parameter value3 .
3
Must be pressed and held while using switches 1 and 2 to change a parameter.
4
No function.
5
No function.
3 Table 4–10 provides the default and option values.
Troubleshooting
4–13
Table 4–10: TSZ07 Configuration Parameters
Configuration Parameter
Default
Options
Unit address (UNIT)
4
0 to 7
Host supplied parity (HOST PAR)
yes
yes or no
Default density (DFLT DEN)
6250 bpi
1600 or 6250 bpi
Write sync option
2 file marks
No sync, 1 file mark, 2 file marks, always
Synchronize on reverse (SYNC
REV). When "yes", only the second
WRITE in a WRITE, BACKSPACE,
WRITE string is recognized.
no
yes or no
Read error retries (RD RETRY)
8
0, 1, 2, 4, 8, 16
Write error retries (WR RETRY)
16
0, 1, 2, 4, 8, 16
Allows one track write errors in
GCR (1 TRKWER)
no
yes or no
Block size (BLK SIZE)
0
0, 4, 8, 16, 32, . . . 32K, 64K
Return ready status during rewind
immediate (RWD RDY)
yes
yes or no
Synchronous data transfer request
initiation (SDTRINIT).1 When "yes",
the target will attempt synchronous
data transfer negotiation with the
host.
no
yes or no
Two’s Compliment (2’s COMP)1;
When "yes", makes the drive a
bootable device from the host.
no
yes or no
2
Note: Two’s compliment will be supported in a later version of VMS.
1 This
configuration is not selectable in some early models, depending on the two firmware chips installed (in
sockets) on the interface circuit board (see Figure 5-15 for location of the board). If the chips are P/N 967018-xxx
or 967019-xxx, the feature is selectable.
2 Earlier versions of the tape drive will not have the two’s compliment as part of the NOVRAM.
For example, assume that you want to change the host supplied parity (HOST PAR) from
yes—the default—to no (refer to Table 4–10).
1. Select Service Aid 142. This places the drive in Review Mode.
2. Press switch 1 two times to view the host supplied parity (HOST PAR).
3. Press switch 3 to enter the Change Mode (refer to Table 4–9) to change the current
parameter being viewed.
4–14 Troubleshooting
4. Press switch 1 or 2 to step to the next parameter value (in this case, no).
5. Press switch 3 to enter the parameter value (no), and to return the drive to the Review
Mode.
6. To save the new setting in nonvolatile memory and exit the service aid, press and hold 5,
and then press 4. The message SAVING appears in the display.
4.5.3 Tape-Loaded Service Aids
The tape-loaded service aids can only be executed with tape loaded in the TSZ07. These
service aids are listed below and described in Sections 4.5.3.1 through 4.5.3.7.
•
Service Aid 211 (Single-Pass Write/Read Check)
•
Service Aid 212 (Read/Write Data)
•
Service Aid 222 (Tape Motion)
•
Service Aid 223 (Multi-Pass Write/Read Check)
•
Service Aid 225 (Firmware ID)
•
Service Aid 242 (Configuration)
•
Service Aid 244 (Tape Read)
4.5.3.1 Service Aid 211 (Single-Pass Write/Read Check)
When activating Service Aid 211, it enters into its Execution Mode where the following
operations may be performed:
•
Write 32-kilobyte blocks of data to EOT (the tape reel must have a write-enable ring)
•
Read reverse to BOT
•
Read forward to EOT
•
Rewind tape to BOT
The read operations check for parity, CRC, and channel drop errors. The drive then switches
to the next higher density and performs the same cycle of operations. Once all densities are
tested, the tape rewinds to BOT and a pass or fail message appears in the display. Passing or
failing is primarily determined by logged errors; the test is successful (pass) if no hard errors
are detected in any density.
The number and types of errors that occur while writing and reading the tape are logged by
the drive and can be observed from the status mode.
NOTE
A poor quality tape with large areas of dropout can cause the test to fail.
While the service aid is in the Execution Mode, the front panel switches function as described
in Table 4–11.
Troubleshooting
4–15
Table 4–11: Switch Functions in the Execution Mode
Switch
Function in Execution Mode
1
Increments the next operation in the cycle.
2
Aborts the current operation, rewinds, and skips to the next density. SKIP DEN appears
in the display.
3
Locks and unlocks switching to the next density. The default is unlocked, which causes
switching. Locked causes continuous cycling in the current density until switch 3 is
pressed again or the service is terminated. LOCK DEN appears in the display when
locked.
4
If pressed once while service aid is running, enables the Status Mode and causes the
service to be exited after the Status Mode is exited.
If pressed once after the service aid is completed, it enables the Status Mode. If pressed
twice, the drive exits the service aid.
5
Enables the Status Mode and allows the service aid to continue after the status mode is
exited.
While in the Status Mode, the front panel switches function as described in Table 4–12.
Table 4–12: Front Panel Switch Functions in the Status Mode
Switch
Function in Status Mode
1
Displays the total number of errors for all densities. TOTAL message is in the display.
2
Displays the type and number of errors detected in 1600 bpi.
3
Displays the type and number of errors detected in 6250 bpi.
4
Exits the Status Mode and re-enters the Execution Mode or exits the service aid,
depending on when the Status Mode is enabled.
5
No function.
Once either switch 1, 2, or 3 is pressed to select which errors to view, switch 1 must be
pressed to display the number of errors and retries in the following sequence. If no errors
occurred, the message NO ERRS appears when switch 1 is pressed. Once the above sequence
is entered, it cannot be exited until all of the error messages have been read, and the STATUS
prompt is reached. During the sequence only switch 1 functions to step through the sequence.
From the STATUS prompt, switches 1 through 4 then function as explained previously for
the Status Mode. Table 4–13 lists the error messages.
4–16 Troubleshooting
Table 4–13: Error Messages
Message
Explanation
HD En
Number (n) of hard errors
CR E n
Number (n) of corrected errors
CRC E n
Number (n) of cyclical redundancy check errors
WT T n
Number (n) of blocks that required write retries
RD T n
Number (n) of blocks that required read retries
WT C n
Number (n) of blocks that required write retries
RD C n
Number (n) of blocks that required read retries
TRK ERRS=nK
Total number (n) of read and write errors for all tracks
TKt=n
Total number (n) of read and write errors for tracks (t) 0 through 7 and P, only
tracks with errors are displayed
TOT 1600 n
Total of all errors for this density. Only shown from the total prompt.
TOT 6250 n
Total of all errors for this density. Only shown from the total prompt.
4.5.3.2 Service Aid 212 (Read/Write Data)
NOTE
To perform Service Aid 212, the tape reel must have a write-enable ring
installed.
Service Aid 212 writes data until EOT, reads reverse back to BOT, then repeats this cycle
until the service aid is exited. No error correction is done.
The block size, the data pattern, and the density of the data written to the tape are selectable
parameters for this service aid. The block size ranges from 1 byte to 8192 bytes in 1-byte
increments, then to 64 kilobytes in 8-kilobyte increments. The data pattern can be set to all
zeros, all ones, 55, AA, or an incrementing pattern that starts at one. Any density available
on the drive can be selected. The default for block size is 16, data pattern is incrementing,
and density is 1600 PE.
During this service aid, the front panel switches function as described in Table 4–14:
Troubleshooting
4–17
Table 4–14: Service Aid 212 Front Panel Switches
Switch
Function
1
Displays the next selectable parameter; used with switch 3 to increment a parameter
setting.
2
Displays the previous selectable parameter; used with switch 3 to decrement a parameter
setting.
3
Displays the selection for a parameter; must be pressed simultaneously with switch 1 or
2 to change the selections for a parameter; displays the current selection while tape is
moving.
4
When pressed once, starts the service aid; when pressed twice, causes the tape to rewind
and the drive to exit from the service aid.
5
Stops tape movement and allows for the changing of parameters when writing.
4.5.3.3 Service Aid 222 (Tape Motion)
The Service Aid 222 moves the tape forward and then in reverse for a length of time as
selected in the Selection Mode at the beginning of the service aid. If the Robot Mode is
selected, there are no time options. While this service aid is in the Selection Mode, the front
panel switches function as described in Table 4–15.
Table 4–15: Front Panel Switch Function in the Selection Mode
Switch
Function in the Selection Mode
1
Selects forward movement of 0.5 seconds and reverse movement of 0.2 seconds.
2
Selects forward movement of 2 seconds and reverse movement of 1 second.
3
Selects forward movement of 10 seconds and reverse movement of 5 seconds.
4
Exits the service aid after rewinding the tape.
5
Starts the Execution Mode if switch 1, 2, or 3 was pressed, or selects the Robot Mode if
switch 1, 2, or 3 was not pressed. Pressing again stops the tape movement and returns
the drive to the Selection Mode.
Table 4–16 describes the function of the front panel switches while in the Robot Mode.
Table 4–16: Front Panel Switch Functions in the Robot Mode
Switch
Function in the Robot Mode
1
Rewinds to BOT.
2
Starts and stops forward movement, goes to EOT and reverses.
3
Starts and stops reverse movement, goes to BOP and then reverses to forward movement.
4
Exits the service aid after rewinding the tape.
5
Stops the tape movement and returns the drive to the selection mode.
4–18 Troubleshooting
4.5.3.4 Service Aid 223 (Multi-Pass Write/Read Check)
Service Aid 223 is identical to Service Aid 211 with the following exceptions:
•
Service Aid 223 continues making passes until manually exited. (Service Aid 211 makes
one pass that includes a sequence of operations for each density, then outputs the status.)
•
The first status message displayed after pressing switches 2 and 3 is PASS n, which is
the number of complete passes the service aid made.
4.5.3.5 Service Aid 225 (Firmware ID)
Service Aid 225 is identical to Service Aid 125, except that it is used when a tape is loaded.
4.5.3.6 Service Aid 242 (Configuration)
Service Aid 242 is identical to Service Aid 142, except that it is used when a tape is loaded.
4.5.3.7 Service Aid 244 (Tape Read)
When Service Aid 244 is activated, it enters its Read Mode. In this mode, the service aid
allows the drive to read a tape without being attached to a system. The drive reads forward
until it reaches EOT, a double file mark, or blank tape; reads reverse to BOT; then repeats
this cycle until exited manually. The number and types of errors that occur while reading a
tape are logged by the drive and can be observed from the Status Mode. Table 4–17 describes
the function of the front panel switches while in the Read Mode.
Table 4–17: Front Panel Switch Functions in the Read Mode
Switch
Function in the Read Mode
1
If reading forward, pressing once shifts to read reverse, pressing twice causes a rewind
and starts the cycle again. If reading reverse, pressing once causes a rewind and starts
the cycle again.
2
Same as switch 1.
3
No function, may cause unpredictable results.
4
When pressed once, enables the Status Mode and causes the service aid to be exited after
the Status Mode has been exited. Pressing twice rewinds the tape and exits the service
aid.
5
Enables the Status Mode and allows the service aid to continue after the Status Mode
had been exited.
Table 4–18 describes the function of the front panel switches while in the Status Mode.
Troubleshooting
4–19
Table 4–18: Front Panel Switch Functions in the Status Mode
Switch
Function in the Status Mode
1
Displays the errors for the density read. If no errors occurred, the message NO ERRS
appears in the display.
2
May be used instead of switch 1 to view 1600 bpi status. Displays the errors for 1600
bpi density in the sequence shown in Table 4–19. If no errors occurred, the message
NO ERRS appears in the display. Do not press if 6250 bpi tape was read, it will cause
unpredictable results.
3
May be used instead of switch 1 to view 6250 bpi status. Displays the errors for 6250
bpi density in the sequence shown in Table 4–19. If no errors occurred, the message
NO ERRS appears in the display. Do not press if 1600 bpi tape was read, it will cause
unpredictable results.
4
Exits the Status Mode and re-enters the Read Mode, or exits the service aid, depending
on whether switch 4 or 5 enabled the Status Mode.
5
No function.
Once switch 1, 2 or 3 is pressed to view the status, switch 1 must be pressed to display the
number of errors and retries in the sequence shown in Table 4–19. Once the above sequence
is entered, it cannot be exited until all of the error messages have been read, and the STATUS
prompt is reached. During the sequence, only switch 1 functions to step through the sequence.
From the STATUS prompt, switch 4 then functions as explained in Table 4–18 for the Status
Mode.
Table 4–19: Error Messages
Message
Explanation
HD En
Number (n) of hard errors
CR E n
Number (n) of corrected errors
CRC E n
Number (n) of cyclical redundancy check errors
WT T n
Number (n) of blocks that required write retries
RD T n
Number (n) of blocks that required read retries
WT C n
Number (n) of blocks that required write retries
RD C n
Number (n) of blocks that required read retries
TRK ERRS=nK
Total number (n) of read and write errors for all tracks
TKt=n
Total number (n) of read and write errors for tracks (t) 0 through 7 and P, only
tracks with errors are displayed
TOT 1600 n
Total of all errors for this density. Only shown from the total prompt.
TOT 6250 n
Total of all errors for this density. Only shown from the total prompt.
4–20 Troubleshooting
4.5.4 Special Service Aids
The special service aids are listed below and described in Sections 4.5.4.1 through 4.5.4.6.
•
Service Aid 513 (Head Calibration)
•
Service Aid 524 (Memory Initialization)
•
Service Aid 525 (Motor Calibration)
•
Service Aid 533 (Door Lock and Interlock Disable)
•
Service Aid 542 (Vendor ID)
•
Service Aid 543 (Product ID)
4.5.4.1 Service Aid 513 (Head Calibration)
Service Aid 513 automatically calibrates the read/write head by adjusting the write current
to the head and setting the read-after-write threshold for all densities.
NOTE
A reference level tape or a known high-quality tape with a write-enable ring
must be loaded to run this service aid. The tape is written on during the
service aid, so any data previously recorded on the tape is lost.
After several minutes of running, the following events may be initiated:
•
If the message PASSED 513 appears; press switch 4.
•
The message SAVE NEW will appear; press switch 1 to save the new calibration values
and exit the service aid.
•
To keep the old values and exit the service aid, press switch 2, message OLD DATA will
appear.
•
If the message FAILED 513 appears at any time during the service aid, execution of the
service aid terminates; switch 4 must be pressed to exit the service aid.
The values calculated during the calibration can be displayed using the following procedure:
1. After the message PASSED 513 appears and before pressing switch 4, press switch 1. This
displays the write current value in hundredths of milliamps preceded by the message .95
ISAT (for example, ".95 ISAT 5000" equals 50 milliamps).
2. Press switch 2 to display the read-after-write threshold value in millivolts preceded by
the message EOUT AVG (for example, "EOUT AVG 512" equals 512 millivolts).
4.5.4.2 Service Aid 524 (Memory Initialization)
Service Aid 524 clears the non-volatile memory and sets the configuration parameters to the
default values listed in Table 4–10.
NOTE
If the EEPROM (non-volatile memory) or the Interface circuit board is replaced, this service aid must be run.
Troubleshooting
4–21
During this service aid the front panel switches function as described in Table 4–20.
Table 4–20: Front Panel Switch Functions During Service Aid 524
Switch
Function
1
Initializes memory and exits the service aid. The message SAVING appears in the
display.
2
No function.
3
No function.
4
Aborts initialization and exits the service aid.
5
No function.
4.5.4.3 Service Aid 525 (Motor Calibration)
Service Aid 525 automatically calibrates the servo offset values.
NOTE
This service aid must be run without a tape in the drive.
It takes several minutes to run this service aid, and while it is running a number of values
are displayed. When finished, a message appears that indicates the calibration has passed,
and the new calibration values are stored in the non-volatile memory. If a message indicating
that the calibration failed appears, the non-volatile memory is not changed.
During this service aid, the front panel switches function as described in Table 4–21.
Table 4–21: Front Panel Switch Functions during Service Aid 525
Switch
Function
1
Starts the motor calibration routine.
2
No function.
3
No function.
4
Aborts the service.
5
No function.
4.5.4.4 Service Aid 533 (Door Lock and Interlock Disable)
Service Aid 533 disables the front panel door lock and the top cover interlock. Switching the
drive off re-enables them. This service aid enables you, if needed, to observe the operation of
the tape drive with the top cover in the operator access position. Another method of disabling
the front door lock and top cover interlock is by using the interlock disable tool, as described
in Section 6.1.
4–22 Troubleshooting
4.5.4.5 Service Aid 542 (Vendor ID)
This service aid allows the Vendor ID field for the SCSI Inquiry (12h) command response to
be edited. When the service aid begins, the current Vendor ID appears in the display and a
cursor is placed on the left character space. The Vendor ID is factory set to DEC. During this
service aid, the front panel switches function as described in Table 4–22.
Table 4–22: Front Panel Switch Functions during Service Aid 542
Switch
Function
1
Increments the selected character up the ASCII character set. Holding the switch
depressed causes the characters to continuously increment.
2
Decrements the selected character down the ASCII character set. Holding the switch
depressed causes the characters to continuously decrement.
3
Moves the cursor one position to the right to select a character.
4
Exits the service aid without saving the changed characters.
4&5
Pressing and holding switch 5 and then pressing switch 4 saves new characters and exits
the service aid. The message SAVING appears in the display.
5
No function
4.5.4.6 Service Aid 543 (Product ID)
This service aid allows the Product ID field for the SCSI Inquiry (12h) command response to
be edited. When this service aid begins, the current Product ID appears on the alphanumeric
display and a cursor is placed on the left character space. The Product ID is factory set to
TSZ07. During this service aid, the front panel switches function as described in Table 4–23.
Table 4–23: Front Panel Switch Functions during Service Aid 543
Switch
Function
1
Increments the selected character up the ASCII character set. Holding the switch
depressed causes the characters to continuously increment.
2
Decrements the selected character down the ASCII character set. Holding the switch
depressed causes the characters to continuously decrement.
3
Moves the cursor one position to the right to select a character.
4
Exits the service aid without saving the changed characters.
4&5
Pressing and holding switch 5 and then pressing switch 4 saves new characters and exits
the service aid. The message SAVING appears in the display.
5
No function.
Troubleshooting
4–23
Chapter 5
Removal/Replacement Procedures
This chapter provides the removal and replacement procedures for most field replaceable units
(FRUs). The procedures included in this manual are based on the recommended spares listed
in Table 5–1. The removal/replacement procedures provided are intended for use by qualified
technicians familiar with the drive. Each FRU is listed in Table 5–1 with its part number and,
if applicable, the title of the associated removal/replacement procedure and section where the
procedure is located.
When performing certain removal/replacement procedures, an adjustment procedure may be
needed to complete the replacement and a service aid may need to be performed to verify
that the replaced part is operating properly. Adjustment procedures are provided in Chapter
6 and service aids are described in Chapter 4.
WARNING
Before performing any removal or replacement procedures, ensure the tape
drive is powered OFF and the power cord is disconnected from the wall
outlet.
CAUTION
Once the drive is installed and running on a host system, removing ac power
from the drive (disconnecting power cord or setting ac power switch to off
(0)) can interrupt the normal operation of the system. Always shut down the
system before removing or connecting the TSZ07 to the SCSI bus, or while
preparing to replace a FRU.
Removal/Replacement Procedures 5–1
Table 5–1: TSZ07 FRUs
Part
Number
Removal/Replacement
Procedure
Section
AC Power Cord, 120 Vac, (BN19P-1K),
US/Canada/Japan
17-00606-02
—
—
AC Power Cord (BN19K-2E), Denmark
17-00310-08
—
—
AC Power Cord (BN26B-2E), UK/Ireland
17-00209-15
—
—
AC Power Cord (BN19W-2E), Germany
/Central Europe
17-00199-21
—
—
AC Power Cord (BN19Z-2E), Italy
17-00364-18
—
—
AC Power Cord, 240 Vac, US/Canada
/Japan
17-00083-44
—
—
AC Power Cord (BN22P-2E), Israel
17-00457-16
—
—
AC Power Cord (BN24R-2E), Australia
/New Zealand
17-00198-14
—
—
AC Power Cord (BN22Z-2E), India/South
Africa
17-00456-16
—
—
AC Power Cord (BN19E-2E), Switzerland
17-00210-07
—
—
Blower
29-28465-01
Blower
5.4.1
Cable, SCSI (BC06P)
17-02659-xx
—
—
Cable, SCSI (BC56H)
17-02008-xx
—
—
Cable, SCSI (BC09D-03)
17-02641-01
—
—
Cable, SCSI (BC09D-06)
17-02641-02
—
—
Diagnostic Display PWB Assy
29-28468-01
Front Panel Display Circuit
Board
5.4.8
Door Assy
29-28466-01
Front Door
5.4.3
EOT/BOT Sensor Assy
29-28649-01
EOT/BOT Sensor Assy
5.4.5
File Protect PWB Assy
FD-11389-01
File-Protect Sensor
5.4.6
Front Panel Assy
29-28467-01
Front Panel
5.4.7
Front Panel Air Filter
29-28481-01
Air Filter
3.3
Front Panel Touch Switch
29-28463-01
Control Switch Circuit Board
5.4.2
Gas Spring Assy
29-28484-01
—
—
Head Assy
29-28474-01
Read/Write Head
5.4.20
Head PWB Assy
29-28478-01
Head Circuit Board
5.4.9
FRU
5–2 Removal/Replacement Procedures
Table 5–1 (Cont.): TSZ07 FRUs
FRU
Part
Number
Removal/Replacement
Procedure
Section
Hub Lock Solenoid
29-28475-01
Hub Lock Solenoid
5.4.10
Interface SCSI PWB Assy, Single-ended
29-28477-01
Interface Circuit Board
5.4.12
Interface SCSI PWB Assy, Differential
29-30410-01
Interface Circuit Board
5.4.12
Door Lock
29-28476-01
Door Lock
5.4.4
Interlock Switch
29-28476-02
Interlock Switch
5.4.13
Plenum Assy
29-28482-01
Plenum
5.4.17
Power Supply Assy
29-28461-01
Power Supply
5.4.18
Read Head Flex Circuit Assy
29-28473-01
Head Circuit Board
5.4.9
Read/Write Formatter PWB Assy
29-28480-01
Read/Write Formatter Circuit
Board
5.4.19
Roller Guide Assy
29-24101-00
Roller Guide 1
5.4.22
Roller Guide Assy
29-24081-00
Roller Guide 3 and 4
Roller Guide 5
5.4.24
5.4.25
Servo PWB Assy
29-28479-01
Servo Circuit Board
5.4.26
Supply Hub
29-24077-00
Supply Hub
5.4.27
Supply Motor Assy
29-28470-01
Supply Motor
5.4.29
Tape-in-Path Sensor
29-28483-01
Tape-in-Path Transmitter
5.4.33
Tape Sensor Assy
29-24093-00
Tape-in-Path Receiver
5.4.32
Tape Tension Sensor Assy
29-28471-01
Tension Sensor/Roller Guide 2
5.4.34
Take-up Motor Assy
29-28469-01
Take-up Motor
5.4.31
Top Cover Assy
29-28462-01
Top Cover
5.4.35
Write/Erase Flex Circuit Assy
29-28472-01
Head Circuit Board
5.4.9
Terminator, SCSI
12-30522-01
—
—
Removal/Replacement Procedures 5–3
5.1 Tools and Materials
Table 5–2 lists the special tools and materials necessary to service the TSZ07 Tape Drive.
Table 5–2: Special Tools and Materials
Item
Part Number
Tape, Master Skew
FD-11319-01
Glyptol
90-09536-00
Loctite 601
90-09321-00
Lubriplate
—
Tape, Cleaning Kit
22-00012-00 (TUC01-00)
Tape, Crimping Tool
47-00038-00
Interlock Disable Tool
29-28408-01
5.2 Opening the Tape Drive to the Operator Access Position
The operator access position provides access to the tape path. There are two procedures for
obtaining operator access to the drive, as follows:
•
Operator Access for the Rack-Mount Drive
•
Operator Access for the Table-Top Drive
5.2.1 Operator Access for the Rack-Mount Drive
To place the tape drive in the operator access position, proceed as follows:
WARNING
Before performing Step 1, ensure that the cabinet is stabilized by extending its support legs fully before pulling the drive out of the cabinet on its
slides.
1. If the drive is mounted in the H9642 style cabinet, remove the shipping bracket from the
rear of the drive next to the SCSI cable connector. Otherwise, proceed to step 2.
2. Reach underneath the left front corner of the front panel and squeeze the rack latch. See
Figure 5–1 for location of rack latch.
3. Pull the drive outward until the slide locks engage.
4. Raise the top cover and place the cover retainer arm in the recess next to the tape path.
See Figure 5–1 for location of the cover retaining arm.
To reinstall the drive into the cabinet or rack, proceed as follows:
1. Fold the cover retaining arm out of the way and then close the top cover.
2. Press the slide locks inward and push the drive into the cabinet.
5–4 Removal/Replacement Procedures
5.2.2 Operator Access for the Table-Top Drive
To place the tape drive in the operator access position, proceed as follows:
NOTE
Step 1 applies to early versions of the TSZ07 which have latches that engage
the top cover. If these latches are not present, proceed to step 2.
1. Push down on the top front corners to release the latches, then lift the enclosure lid.
2. Raise the top cover and place the cover retainer arm in the recess next to the tape path.
To close the enclosure, proceed as follows:
1. Fold the cover retaining arm out of the way and close the top cover of the tape drive.
2. Close the enclosure lid by pushing down on the top front corners of the enclosure lid until
the latches lock.
Figure 5–1: Operator Access Position
Removal/Replacement Procedures 5–5
5.3 Opening the Tape Drive to the Service Access Position
The service access position provides access to the internal electronic and mechanical parts
of the drive. There are two procedures for obtaining service access to the drive, one for the
rack-mounted drive and one for the table-top drive, as follows:
•
Service Access for the Rack-Mount Drive
•
Service Access for the Table-Top Drive
5.3.1 Service Access for the Rack-Mount Drive
To place the tape drive in the service access position, proceed as follows:
WARNING
Before performing Step 1, ensure that the cabinet is stabilized by extending its support legs fully before pulling the drive out of the cabinet on its
slides.
1. If the drive is mounted in the H9642 style cabinet, remove the shipping bracket from the
rear of the drive next to the SCSI cable connector. Otherwise, proceed to step 2.
2. Reach underneath the left front corner of the front panel and squeeze the rack latch, then
pull the drive outward until the slide locks engage.
3. Raise the top cover and place the cover retainer arm in the recess next to the tape path.
4. Locate and loosen the two retainer screws on the deckplate (shown in Figure 5–2).
5–6 Removal/Replacement Procedures
Figure 5–2: Location of Retaining Screws
5. Fold the cover retaining arm out of the way and then close the top cover.
6. While grasping the bottom of the front panel, lift upward. When the gas strut is fully
extended, the safety support automatically locks the deck plate in the service access
position. The service access position is shown in Figure 5–3.
WARNING
Do not service the drive unless the safety support is set against the gas
strut shaft.
Removal/Replacement Procedures 5–7
Figure 5–3: Service Access Position
To reinstall the drive into the cabinet or rack, proceed as follows:
CAUTION
When performing the next step, make sure the cables are secure and are
not pinched.
1. Pull upward on the safety support to disengage it, then lower the deck plate.
2. Raise the top cover and place the cover retainer arm in the recess next to the tape path.
3. Tighten the two retaining screws into the chassis.
4. Press the slide locks inward and push the drive into the cabinet.
5–8 Removal/Replacement Procedures
5.3.2 Service Access for the Table-Top Drive
To place the tape drive in the service access position, proceed as follows:
NOTE
Step 1 applies to early versions of the TSZ07 which have latches that engage
the top cover. If these latches are not present, proceed to step 2.
1. Push down on the top front corners to release the latches, then lift the enclosure lid.
2. Raise the top cover and place the cover retainer arm in the recess next to the tape path.
3. Locate and loosen the two retainer screws on the deckplate (shown in Figure 5–2).
4. Fold the cover retaining arm out of the way and close the top cover.
5. While grasping the bottom of the front panel, lift upward. When the gas strut is fully
extended, the safety support automatically locks the deck plate in the service access
position. The service access position is shown in Figure 5–3.
WARNING
Do not service the drive unless the safety support is set against the gas
strut shaft.
To close the table-top drive, proceed as follows:
CAUTION
When performing the next step, make sure the cables are secure and are
not pinched.
1. Pull upward on the safety support to disengage it, then lower the deck plate.
2. Raise the top cover and place the cover retainer arm in the recess next to the tape path.
3. Tighten the two retaining screws into the chassis.
4. Fold the cover retaining arm out of the way and close the top cover.
5. Close the enclosure lid by pushing down on the top front corners of the enclosure lid until
the latches lock.
Removal/Replacement Procedures 5–9
5.4 Removal/Replacement Procedures
The following sections provide the specific removal/replacement procedures for the TSZ07.
These procedures are intended for use by qualified technicians who are thoroughly familiar
with the tape drive. Therefore, it is assumed that technicians know whether the drive needs to
be placed in the operator access position or the service access position to perform a particular
removal and replacement procedure. Procedures for placing the drive in the operator and
service positions are provided in Section 5.2 and Section 5.3 respectively.
5.4.1 Blower (P/N 29-28465-01)
To remove the blower, see Figure 5–4 and proceed as follows:
! from the power supply cable.
Remove the three screws " securing the blower # to the plenum $.
1. Disconnect the blower motor connector
2.
To replace the blower, follow the removal procedure in reverse order.
5–10 Removal/Replacement Procedures
Figure 5–4: Removing the Blower
Removal/Replacement Procedures 5–11
5.4.2 Control Switch Circuit Board (P/N 29-28463-01)
To remove the control switch circuit board, see Figure 5–5 and proceed as follows:
1. Remove the front panel display circuit board (refer to Section 5.4.8).
2. Remove two nuts
! to remove control switch circuit board ".
To replace the control switch circuit board, follow the removal procedure in reverse order.
Figure 5–5: Removing the Control Switch Circuit Board
5–12 Removal/Replacement Procedures
5.4.3 Front Door (P/N 29-28466-01)
To remove the front door, see Figure 5–6 and proceed as follows:
1. Remove the front panel (refer to Section 5.4.7).
2. With the front door fully opened, remove the two springs
3. Push the front door inward to separate the arms
4. Remove the front door
!.
" from the pivots #.
$ through the opening in the front panel.
To replace the front door, follow the removal procedure in reverse order. However, note the
following about lubrication and spring attachment:
1. Put a small amount of Lubriplate on each pivot
onto the pivots.
"
# before snapping the front door arms
!
2. The straight arm of the springs
attach to the front panel support; the angled arm of
the spring attaches to the front door arm.
Figure 5–6: Removing the Door
Removal/Replacement Procedures 5–13
5.4.4 Door Lock (P/N 29-28476-01)
To remove the door lock, see Figure 5–7 and proceed as follows:
1. Disconnect both connectors
2. Remove the two clips
lock.
! and " from the door lock #.
$ securing the door lock to the front panel, then remove the door
To replace the door lock, follow the removal procedure in reverse order. However, note the
following about installing clips and using the service aid:
1. Follow the removal procedure in reverse order. The tab on the clips
$ goes downward.
2. Use Service Aid 132 (Section 4.5.2.4) to verify that the door lock functions properly.
Figure 5–7: Removing the Door Lock
5–14 Removal/Replacement Procedures
5.4.5 EOT/BOT Sensor Assembly (P/N 29-28649-01)
To remove the EOT/BOT Sensor Assembly, see Figure 5–8 and proceed as follows:
!
1. Remove the two screws
and washers securing the EOT/BOT Sensor Assembly
deck plate, then remove the assembly.
2. Disconnect the connector
" to the
# from the EOT/BOT Sensor Assembly.
To replace the sensors, follow the removal procedure in the reverse order. Use Service Aid
132 (Section 4.5.2.4) to verify that both sensors function properly.
Figure 5–8: Removing the EOT/BOT Sensor Assembly
Removal/Replacement Procedures 5–15
5.4.6 File-Protect Sensor (P/N FD-11389-01)
To remove the file-protect sensor, see Figure 5–9 and proceed as follows:
! from the file-protect sensor ".
Remove the two screws # securing the sensor to the deck plate.
1. Disconnect the cable
2.
To replace the file-protect sensor, follow the removal procedure in the reverse order. Use
Service Aid 131 (Section 4.5.2.3) to verify that the sensor functions properly.
Figure 5–9: Removing the File-Protect Sensor
5–16 Removal/Replacement Procedures
5.4.7 Front Panel (P/N 29-28467-01)
To remove the front panel, see Figure 5–10 and proceed as follows:
! securing the front panel " to the deck plate %.
Disconnect the electrical connectors # and $, then remove the front panel.
1. Remove the four screws
2.
To replace the front panel, follow the removal procedure in the reverse order. Use Service
Aid 132 (Section 4.5.2.4) to verify that the door lock functions properly.
Figure 5–10: Removing the Front Panel
Removal/Replacement Procedures 5–17
5.4.8 Front Panel Display Circuit Board (P/N 29-28468-01)
To remove the front panel display circuit board, see Figure 5–11 and proceed as follows:
1. Remove the front panel (refer to Section 5.4.7).
!
by placing a board
2. Release the front panel display circuit board from the four standoffs
removal tool over the standoff and gently prying the board away from the standoff.
3. Connector J5, on the opposite side of the board, connects to the control switch circuit
board shown in Figure 5–5.
To replace the front panel display circuit board, follow the removal procedure in the reverse
order. Make sure that connector J5 on the front panel display board connects to the control
switch circuit board.
5–18 Removal/Replacement Procedures
Figure 5–11: Removing the Front Panel Display Circuit Board
Removal/Replacement Procedures 5–19
5.4.9 Head Circuit Board (P/N 29-28478-01)
To remove the head circuit board, see Figure 5–12 and proceed as follows:
CAUTION
When removing or replacing the head circuit board, be careful not to
damage the head cables plugged into J3 and J4 of the head circuit board;
they are fragile. The cable plugged into J3 (closest to J2 ) is referred
to as the Read Head Flex Circuit Assembly (P/N 29-28473-01) in Table 5–1.
The cable plugged into J4 (next to J3 ) is referred to as the Write/Erase
Flex Circuit Assembly (P/N 29-28472-01) in Table 5–1.
$
1. Disconnect connectors J1
!, J2 ", J3, J4 $ and J5 #.
2. While supporting the head circuit board, remove the three screws
to the top plate, then remove the board from the drive.
"
% attaching the board
To replace the head circuit board, follow the removal procedure in the reverse order. When
connecting the head cables, the printed-circuit-board portion of each connector faces outward
and the ninety-degree pins face inward. After replacing the head circuit board, calibrate the
read/write head using Service Aid 513 (refer to Section 4.5.4.1).
5–20 Removal/Replacement Procedures
Figure 5–12: Removing the Head Circuit Board
Removal/Replacement Procedures 5–21
5.4.10 Hub Lock Solenoid (P/N 29-28475-01)
To remove the hub lock solenoid, see Figure 5–13 and proceed as follows:
! from the hub lock solenoid ".
Remove the two screws # attaching the solenoid to the deck plate, then remove the
1. Disconnect the connector
2.
solenoid.
To replace the hub lock solenoid, follow the removal procedure in the reverse order. However,
make sure the bell crank plunger
is inserted through the spring
and into the solenoid
. Verify that the hub lock functions properly using Service Aid 132 Section 4.5.2.4.
"
$
5–22 Removal/Replacement Procedures
%
Figure 5–13: Removing the Hub Lock Solenoid
Removal/Replacement Procedures 5–23
5.4.11 Input Air Duct
There are two procedures for removing the input air duct. The procedure used depends on if
the TSZ07 has a plenum with or without a removable access panel. To remove the input air
duct, see Figure 5–14 and proceed to Section 5.4.11.1 or Section 5.4.11.2 as appropriate:
5.4.11.1 Removal Procedure Without Plenum Access Panel
Use this procedure if the plenum does not have a removable access panel.
1. Remove the front panel (refer to Section 5.4.7).
!
2. To remove the input air duct , gently move it backwards (towards rear of drive) to
disengage the two teeth
from the metal shield (located behind the control panel) and
by squeezing the left side of
simultaneously disengage the duct from the plenum tooth
the duct where it enters the plenum . Then slide the duct out of the plenum. (Rotating
the duct while you slide it out makes removing it easier.)
"
$
#
5.4.11.2 Removal Procedure With Plenum Access Panel
Use this procedure if the plenum has a removable access panel.
1. Remove the front panel (Refer to Section 5.4.7).
2. Remove the input air duct
the front of the shield.
!
by moving it backwards to disengage the two teeth
" at
5.4.11.3 Replacing the Input Air Duct
Follow the appropriate removal procedure (Section 5.4.11.1 or Section 5.4.11.2) in reverse
order.
5–24 Removal/Replacement Procedures
Figure 5–14: Removing the Input Air Duct
Removal/Replacement Procedures 5–25
5.4.12 Interface Circuit Board (P/N 29-28477-01/29-30410-01)
To remove the interface circuit board, see Figure 5–15 and proceed as follows:
1. If possible, record configuration parameters before replacing the board. Use Service Aid
142 to review the configuration parameters. For information on Service Aid 142, refer to
Section 4.5.2.6.
2. Remove the read/write formatter circuit board (refer to Section 5.4.19).
3. Disconnect connectors J1
!, J5 ", and J6 #.
$
by placing the board removal
4. Release the interface circuit board from the six standoffs
tool over each standoff and gently prying the board away from the standoff.
To replace the interface circuit board, proceed as follows:
1. Follow the removal procedure in the reverse order.
2. Run Service Aid 524 (refer to Section 4.5.4.2).
3. Run Service Aid 525 (refer to Section 4.5.4.3).
4. Run Service Aid 513 (refer to Section 4.5.4.1).
5. If the default configuration parameters need to be changed, run Service Aid 142 (refer to
Section 4.5.2.6).
6. Run Service Aid 543 (refer to Section 4.5.4.6).
7. Run Service Aid 542 (refer to Section 4.5.4.5).
5–26 Removal/Replacement Procedures
Figure 5–15: Removing the Interface Circuit Board
Removal/Replacement Procedures 5–27
5.4.13 Interlock Switch (P/N 29-28476-02)
To remove the interlock switch, see Figure 5–16 and proceed as follows:
1. Remove the front panel (refer to Section 5.4.7).
2. Disconnect the two wires
! from the interlock switch ".
3. Press inward on the sides of the switch and move it upward to remove it.
To replace the interlock switch, follow the removal procedure in reverse order.
Figure 5–16: Removing the Interlock Switch
5–28 Removal/Replacement Procedures
5.4.14 Left Output Air Duct
To remove the left output air duct, see Figure 5–17 and proceed as follows:
! attaching the air duct " to the deck plate.
Disconnect the air duct from the nozzle #.
1. Remove the screw
2.
To replace the left output air duct, follow the removal procedure in reverse order.
Figure 5–17: Removing the Left Output Air Duct
Removal/Replacement Procedures 5–29
5.4.15 Manual Release Switch
To remove the manual release switch, refer to Figure 5–18 and proceed as follows:
1. Remove the front panel (refer to Section 5.4.7).
2. Place both front panel cables behind the metal shield. The metal shield is located behind
the front panel and not shown in Figure 5–18.
3. Remove the screw attaching the right output air duct to the shield.
4. Remove the three screws attaching the metal shield to the deck plate, then remove the
shield.
!
5. Remove the two screws
and washers securing the manual release switch
plate, then remove the switch.
" to the deck
To replace the manual release switch, follow the removal procedure in reverse order. Note
that the short leg of the switch hooks behind the pin
in the deck plate.
#
Figure 5–18: Removing the Manual Release Switch
5–30 Removal/Replacement Procedures
5.4.16 Packer Arm
To remove the packer arm, refer to Figure 5–19 and proceed as follows:
1. Remove the read/write formatter circuit board (refer to Section 5.4.9).
! and wave washer ".
Remove the packer arm # from the deck plate by pulling it upward.
Check whether the upper bearing $ and lower bearing % are damaged.
2. Remove the grip ring
3.
4.
Replace if
necessary.
To replace the packer arm, follow the removal procedure in reverse order. When replacing the
packer arm, adjust the grip ring on the packer arm shaft until the wavewasher is compressed
to approximately 50%. If either bearing ( or ) needs to be replaced, apply Loctite 601 (P/N
90-09321-00) to the outside of the bearing where it contacts the deck plate before installing
the new bearing.
$ %
Figure 5–19: Removing the Packer Arm
Removal/Replacement Procedures 5–31
5.4.17 Plenum (P/N 29-28482-01)
To remove the plenum, refer to Figure 5–20 and proceed as follows:
1. Remove the left output air duct (refer to Section 5.4.14).
2. Remove the right output air duct (refer to Section 5.4.21).
3. Remove the input air duct (refer to Section 5.4.11).
4. Disconnect the motor connector
5. Remove the four screws
!.
" attaching the plenum # to the top plate.
To replace the plenum, follow the removal procedure in reverse order.
5–32 Removal/Replacement Procedures
Figure 5–20: Removing the Plenum
Removal/Replacement Procedures 5–33
5.4.18 Power Supply (P/N 29-28461-01)
To remove the power supply, refer to Figure 5–21 and proceed as follows:
! and J2 " from the power supply #.
Remove the two nuts $ and nut plate % attaching the power supply to the side of the
1. Disconnect the connector J1
2.
chassis.
3. Remove the two nuts
& attaching the power supply to the bottom of the chassis.
4. Lift the rear of the power supply just enough to clear the standoffs and then lift the front
of the supply and carefully maneuver it out of the drive.
To replace the power supply, follow the removal procedure in reverse order.
5–34 Removal/Replacement Procedures
Figure 5–21: Removing the Power Supply
Removal/Replacement Procedures 5–35
5.4.19 Read/Write Formatter Circuit Board (P/N 29-28480-01)
To remove the read/write formatter circuit board, refer to Figure 5–22 and proceed as follows:
! and J4 ".
Remove the two screws #.
Release the circuit board $ from the standoff % by pulling the board off the standoff.
Remove the board by pulling on the two extractor grips &.
1. Disconnect J3
2.
3.
4.
To replace the read/write formatter board, follow the removal procedure in reverse order. Run
Service Aid 513 (refer to Section 4.5.4.1).
5–36 Removal/Replacement Procedures
Figure 5–22: Removing the Read/Write Formatter Circuit Board
Removal/Replacement Procedures 5–37
5.4.20 Read/Write Head (P/N 29-28472-01)
To remove the read/write head, see Figure 5–23 and proceed as follows:
1. Remove the head circuit board (refer to Section 5.4.9).
! that attach the read/write head " to the deck plate $.
While holding the head, remove the center screw #, then remove the head.
2. Remove the four screws
3.
To replace the read/write head, proceed as follows:
1. Follow the removal procedure in reverse order. However, leave the head covered until the
installation is completed, and do not tighten the center screw .
#
2. Perform the Skew Adjustment (refer to Section 6.3).
3. Run Service Aid 513 (refer to Section 4.5.4.1).
Figure 5–23: Removing the Read/Write Head
5–38 Removal/Replacement Procedures
5.4.21 Right Output Air Duct
To remove the right output air duct, refer to Figure 5–24 and proceed as follows:
•
•
•
Remove the front panel (refer to Section 5.4.7).
! attaching the air duct " to the deck plate.
Disconnect the air duct from the nozzle # and slide it forward through the opening in
Remove the screw
the shield.
To replace the right output air duct, follow the removal procedure in reverse order.
Removal/Replacement Procedures 5–39
Figure 5–24: Removing the Right Output Air Duct
5–40 Removal/Replacement Procedures
5.4.22 Roller Guide 1 (P/N 29-24101-00)
To remove roller guide 1, refer to Figure 5–25 and proceed as follows:
! attaching the roller guide ", then remove the roller guide.
If there are any shims # between the roller guide and the mounting plate $, save them.
1. Remove the screw
2.
NOTE
Any shims removed from the location of roller guide 1 must be used again
when replacing the roller guide. Do not swap shims between rollers.
To replace roller 1, perform the removal procedure in reverse order and adhere to the following
note.
NOTE
# when you removed the roller guide, place them
" and the mounting plate $.
If you saved any shims
between the roller guide
Figure 5–25: Removing Roller Guide 1
Removal/Replacement Procedures 5–41
5.4.23 Roller Guide 2
For removal and replacement instructions for roller guide 2, refer to Section 5.4.34.
5.4.24 Roller Guide 3 or 4 (P/N 29-24081-00)
To remove roller guide 3 or 4, refer to Figure 5–26 and proceed as follows:
1. Remove the screw
! securing the roller guide ", then remove the roller guide.
To replace roller guide 3 or 4, perform the removal procedure in reverse order.
Figure 5–26: Removing Roller Guide 3 or 4
5–42 Removal/Replacement Procedures
5.4.25 Roller Guide 5 (P/N 29-24081-00)
To remove roller guide 5, refer to Figure 5–27 and proceed as follows:
! from the top of the roller guide ", then remove the roller guide.
If there are any shims # between the roller guide and the mounting plate $, save them.
1. Remove the screw
2.
NOTE
Any shims removed from the location of roller guide 5 must be used again
when replacing roller 5. Do not swap shims between rollers.
To replace roller 5, perform the removal procedure in reverse order and adhere to the following
note.
NOTE
# when you removed the roller guide, place them
" and the mounting plate $.
If you saved any shims
between the roller guide
Figure 5–27: Removing Roller Guide 5
Removal/Replacement Procedures 5–43
5.4.26 Servo Circuit Board (P/N 29-28479-01)
To remove the servo circuit board, refer to Figure 5–28 and proceed as follows:
1. Remove the read/write formatter circuit board (refer to Section 5.4.19).
2. Disconnect connectors J2
#
! and J3 ".
3. Release the board
from the nine standoffs by placing the board removal tool over each
standoff and gently prying the board away from the standoff.
To replace the servo circuit board, proceed as follows:
1. Perform the removal procedure in reverse order.
2. Run Service.
5–44 Removal/Replacement Procedures
Figure 5–28: Removing the Servo Circuit Board
Removal/Replacement Procedures 5–45
5.4.27 Supply Hub (P/N 29-24077-00)
To remove the supply hub, refer to Figure 5–29 and proceed as follows:
!
1. Rotate the supply hub
until the two screws
shaft are facing toward the front door.
2. Loosen the two screws
" that secure the supply hub to the motor
", then remove the supply hub.
To replace the supply hub, proceed as follows:
1. Install the supply hub
! on the motor shaft, but do not tighten the two screws.
2. Perform the Supply Hub Adjustment (refer to Section 6.4).
Figure 5–29: Removing the Supply Hub
5–46 Removal/Replacement Procedures
5.4.28 Supply Hub Bell Crank
To remove the supply hub bell crank, refer to Figure 5–30 and proceed as follows:
1. Remove the supply hub (refer to Section 5.4.27).
2. Remove the clip
the bell crank.
! securing the supply hub bell crank " to the supply motor, then remove
To replace the supply hub bell crank, proceed as follows:
1. Perform the removal procedure in reverse order.
2. To ensure that the hub lock functions properly, run Service Aid 132 (refer to Section 4.5.2.4).
Figure 5–30: Removing the Supply Hub Bell Crank
Removal/Replacement Procedures 5–47
5.4.29 Supply Motor (P/N 29-28470-01)
To remove the supply motor, refer to Figure 5–31 and proceed as follows:
1. Remove the supply hub (refer to Section 5.4.27).
! securing the supply hub bell crank " to the supply motor #.
Disconnect the two connectors ($ and %) from the motor.
Loosen the four screws & securing the supply motor to the deck plate.
Hold the motor while removing the four screws &.
When removing the motor from the deck plate, slide the supply hub bell crank " off the
stud ' on the motor.
2. Remove the clip
3.
4.
5.
6.
To replace the motor, proceed as follows:
1. Perform the removal procedure in reverse order.
2. Perform the Supply Hub Adjustment (Section 6.4).
5–48 Removal/Replacement Procedures
Figure 5–31: Removing the Supply Motor
Removal/Replacement Procedures 5–49
5.4.30 Take-Up Hub
To remove the take-up hub, refer to Figure 5–32 and proceed as follows:
! away from the take-up hub " using tape or string.
Loosen the two screws # that secure the take-up hub " to the take-up motor shaft, then
1. Secure the packer arm
2.
remove the take-up hub.
To replace the take-up hub, proceed as follows:
1. Install the take-up hub
" on the take-up motor shaft. Do not tighten the two screws #.
2. Perform the Take-Up Hub Adjustment (refer to Section 6.5).
5–50 Removal/Replacement Procedures
Figure 5–32: Removing the Take-Up Hub
Removal/Replacement Procedures 5–51
5.4.31 Take-Up Motor (P/N 29-28469-01)
To remove the take-up motor, refer to Figure 5–33 and proceed as follows:
1. Remove the take-up hub (Section 5.4.30) and the plenum (Section 5.4.17) or the plenum
access panel, depending on the configuration.
! and ") from the motor #.
2. Disconnect the two connectors (
$ securing the take-up motor to the deck plate.
Hold the motor while removing the four screws $, then remove the motor.
3. Loosen the four screws
4.
To replace the take-up motor, proceed as follows:
1. Perform the removal procedure in reverse order.
2. Perform the Take-Up Hub Adjustment (refer to Section 6.5).
5–52 Removal/Replacement Procedures
Figure 5–33: Removing the Take-Up Motor
Removal/Replacement Procedures 5–53
5.4.32 Tape-In-Path Receiver (P/N 29-24093-00)
To remove the tape-in-path receiver, refer to Figure 5–34 and proceed as follows:
! from the tape-in-path receiver ".
Remove the screw # attaching the tape-in-path receiver " to the deck plate, then remove
1. Disconnect the connector
2.
the receiver.
To replace the tape-in-path receiver, proceed as follows:
1. Perform the removal procedure in reverse order.
2. Check that the sensor functions properly using Service Aid 131 (Section 4.5.2.3).
Figure 5–34: Removing the Tape-in-Path Receiver
5–54 Removal/Replacement Procedures
5.4.33 Tape-In-Path Transmitter (P/N 29-28483-01)
To remove the tape-in-path transmitter, refer to Figure 5–35 and proceed as follows:
! from the tape-in-path transmitter ".
Remove the two screws # attaching the tape-in-path transmitter " to the deck plate,
1. Disconnect the connector
2.
then remove the transmitter.
To replace the tape-in-path transmitter, proceed as follows:
1. Perform the removal procedure in reverse order.
2. Check that the sensor functions properly using Service Aid 131 (Section 4.5.2.3).
Figure 5–35: Removing the Tape-in-Path Transmitter
Removal/Replacement Procedures 5–55
5.4.34 Tension Sensor/Roller Guide 2 (P/N 29-28471-01)
To remove tension sensor/roller guide 2, refer to Figure 5–36 and proceed as follows:
! from the head circuit board.
Remove the screw " attaching the roller guide #, then remove the roller guide.
If there are any shims $, save them.
1. Disconnect connector J5
2.
3.
NOTE
$
Any shims
removed from the location of tension sensor/roller guide 2
must be used again when replacing the roller guide. Do not swap shims
between roller guides.
To replace tension sensor/roller guide 2, perform the removal procedure in reverse order and
adhere to the following note.
NOTE
$ when you removed the roller guide, place them
# and the mounting plate.
If you saved any shims
between the roller guide
5–56 Removal/Replacement Procedures
Figure 5–36: Removing Tension Sensor/Roller Guide 2
Removal/Replacement Procedures 5–57
5.4.35 Top Cover (P/N 29-28462-01)
To remove the top cover, refer to Figure 5–37 and proceed as follows:
1. Remove the four screws
cover.
! attaching the top cover " to the hinges, then remove the top
To replace the top cover, proceed as follows:
1. Perform the removal procedure in reverse order.
2. If necessary, adjust the rear hinges so that the top cover opens and closes without binding.
3. If necessary, adjust the top cover latches to ensure that the top cover closes correctly. The
latches are located at the front of the top cover.
Figure 5–37: Removing the Top Cover
5–58 Removal/Replacement Procedures
Chapter 6
Adjustment Procedures
This chapter provides the Interlock Switch Disable Procedure to disable the front panel for
troubleshooting, testing and adjustment of the drive. This chapter also provides the following
adjustment procedures and the Operation Verification procedure. The adjustment procedures
include:
•
Read Threshold Adjustment
•
Skew Adjustment
•
Supply Hub Adjustment
•
Take-up Hub Adjustment
The Operation Verification procedure is used to ensure that the drive operates properly after
troubleshooting, FRU replacement, and/or adjustment procedures have been performed.
CAUTION
If it is necessary to turn off or remove the drive to make an adjustment,
always shut down the host system first to prevent an abnormal interruption
to system operation.
Adjustment Procedures 6–1
6.1 Interlock Switch Disable Procedure
This procedure describes how to disable the top cover interlock switch on the front panel
using the interlock switch disable tool (P/N 29-28408-01) for troubleshooting, testing, and
adjustment purposes. Disabling this interlock switch also disables the front door lock.
Another method of disabling the top cover interlock switch and front door lock is by using
Service Aid 533, as described in Section 4.5.4.4.
To disable the interlock switch, proceed as follows:
1. Switch off the tape drive and place it in the operator access position (refer to Section 5.2).
2. Insert the interlock switch disable tool into the interlock switch located behind the front
panel (see Figure 6–1) and turn the tool ninety degrees clockwise.
3. To re-enable the interlock switch, turn the tool ninety degrees counterclockwise and
remove it.
6–2 Adjustment Procedures
Figure 6–1: Location of Interlock Switch
Adjustment Procedures 6–3
6.2 Read Threshold Adjustment
The read threshold adjustment calibrates the read/write head by adjusting the write current to
the head and setting the read-after-write threshold for all densities. To make this adjustment,
proceed as follows:
1. Switch on the drive.
2. Load a reference level tape, or a known good tape, with a write-enable ring. Data will be
written to the tape.
3. Run Service Aid 513. It automatically adjusts the read threshold. For information on the
service aid, refer to Section 4.5.4.1.
6.3 Skew Adjustment
The skew adjustment sets the coils in the read/write head so that they align with recorded
data on a tape. This ensures that a tape written to in this drive may be read on another
drive. To perform this adjustment, proceed as follows:
1. Place the tape drive in the service access position (refer to Section 5.3).
2. Switch on the drive.
3. Load a master skew tape without a write-enable ring.
4. Connect an oscilloscope probe to pin 10/19 of connector J6 of the head circuit board.
Connect the ground clip to pin 20 of J6.
5. Set the controls of the oscilloscope as follows:
Gain—0.2 volts/division
Trigger—Internal, (+), ac
Sweeptime—2 microseconds/division. Adjust the time base so that one period of the
wave form fills the display.
6. Start Service Aid 222 in the Robot Mode (refer to Section 4.5.3.3).
CAUTION
To prevent the master skew tape from being damaged, reverse the tape
direction only at BOT and EOT, and do not use the REWIND switch to
move the tape.
7. While running the tape forward and then in reverse, turn the skew adjustment screw
(see Figure 6–2) until the outputs of all tracks fall within 27 percent or less of the data
time as shown in Figure 6–3. (The screw can be reached through the circular hole in the
center of the head circuit board.)
8. Apply glyptol or torque seal to the skew adjustment screw. The Digital part number for
glyptol is 90-09536-00, however, any non-conductive sealant of this type may be used.
6–4 Adjustment Procedures
9. Unload the master skew tape and exit the service aid.
10. Disconnect the oscilloscope.
Figure 6–2: Location of Skew Adjustment Screw
Adjustment Procedures 6–5
Figure 6–3: Skew Adjustment Waveform
6–6 Adjustment Procedures
6.4 Supply Hub Adjustment
The supply hub adjustment is used to set the vertical position of the supply hub on the supply
motor shaft so that tape is wound and rewound properly on a loaded reel. To perform this
adjustment, proceed as follows:
1. Refer to Figure 6–4 and then loosen the two screws
supply motor shaft.
" securing the supply hub ! to the
Figure 6–4: Location of Supply Hub Screws
2. Position the supply hub until the top of the supply motor shaft and the base of the supply
hub dwell are aligned as shown in Figure 6–5.
3. Tighten the two locking screws.
4. Load a scratch tape.
5. Run the tape to EOT then back to BOT using Service Aid 222 in the Robot Mode. For
details on Service Aid 222, refer to Section 4.5.3.3.
Adjustment Procedures 6–7
6. After the tape has been completely unwound and rewound back on the supply reel, check
that the tape is vertically centered on the supply hub (top or bottom of the tape should not
be rubbing on the reel). If the tape is centered, the adjustment is correct; if not, proceed
as follows:
a. Unload the tape.
b. Loosen the two screws on the supply hub.
c.
Move the hub up or down as necessary on the motor shaft.
d. Retighten the screws, then go back to step 4.
Figure 6–5: Aligning Motor Shaft with Supply Hub Dwell
6–8 Adjustment Procedures
6.5 Take-Up Hub Adjustment
The take-up hub adjustment is used to set the vertical position of the take-up hub on the
take-up motor shaft so that tape is wound and rewound properly on the take-up hub. To
perform this adjustment, proceed as follows:
1. Refer to Figure 6–6, and secure the packer arm
tape or string.
2. Loosen the two screws
! away from the take-up hub " using
# securing the take-up hub " to the motor shaft $.
3. Align the base of the take-up hub with the top plate.
4. Place the packer arm against the hub.
5. Load a scratch tape.
6. Wind the tape on the take-up hub by running the tape to EOT using Service Aid 222 in
the Robot Mode. For details on Service Aid 222, refer to Section 4.5.3.3.
7. The tape is now loaded on the take-up hub. Check that the tape is vertically centered on
the take-up hub. If it is, the adjustment is correct; if not, proceed as follows:
a. Unload the tape.
b. Secure the packer arm away from the take-up hub.
c.
Loosen the two screws on the take-up hub.
d. Move the hub up or down as necessary on the motor shaft.
e.
Retighten the screws, then go back to step 4.
Adjustment Procedures 6–9
Figure 6–6: Adjusting the Take-Up Hub
6–10 Adjustment Procedures
6.6 Operation Verification
When you have completed troubleshooting, replaced a FRU, or made an adjustment to the
drive, the drive must be verified for proper operation. To verify the drive operation, proceed
as follows:
1. Power on the drive and see that it passes the power up diagnostics as described in Chapter
4.
2. Load a tape and run it to EOT and back to BOT, or use Service Aid 222. For details on
Service Aid 222, refer to Section 4.5.3.3.
3. Read and write to a known good tape or use Service aid 212. For details on Service Aid
212, refer to Section 4.5.3.2.
4. Unload the tape to ensure that it unloads properly as described in Chapter 2.
Adjustment Procedures 6–11
Appendix A
Specifications
Table A–1 provides the physical, environmental, electrical, and performance specifications for
the TSZ07 Tape Drive.
Table A–1: TSZ07 Specifications
PHYSICAL
Table-Top Unit
(TSZ07-CA/FA)
Rackmount Unit
(TSZ07-AA/DA)
Cabinet Unit
(TSZ07-BA/BB, -EA
/EB)
Height
26.90 cm (10.59 in)
22.23 cm (8.75 in)
106.7 cm (42 in)
Width
50.50 cm (19.88 in)
43.18 cm (17.00 in)
55.9 cm (22 in)
Depth
68.43 cm (26.94 in)
62.23 cm (24.5 in)
76.2 cm (30 in)
Weight
36.74 kg (81 lbs)
31.8 kg (70 lbs)
106.6 kg (235 lbs)
Shipping Weight
40.82 kg (90 lbs)
36.28 kg (80 lbs)
148.5 kg (330 lbs)
Specifications A–1
Table A–1 (Cont.): TSZ07 Specifications
ENVIRONMENTAL
Acoustic Noise Emission
Acoustics—declared values per ISO 9296 and ISO 7779:
Sound Power Level
LWAd, B
Sound Pressure Level
LpAm, dBA
(bystander positions)
Product
Idle
Operate
Idle
Operate
TSZ07-CA
5.8
6.2
41
43
TSZ07-BA/B
5.8
6.2
38
43
TSZ07-AA
5.8
6.2
39
43
(Current values for specific configurations are available from Digital representatives. 1 B = 10 dBA.)
Schallemissionswerte - Werteangaben nach ISO 9296 und ISO 7779/DIN EN27779:
Schalleistungspegel
LWAd, B
Schalldruckpegel
LpAm, dBA
(Zuschauerpositionen)
Produkt
Leerlauf
Betrieb
Leerlauf
Betrieb
TSZ07-CA
5,8
6,2
41
43
TSZ07-BA/B
5,8
6,2
38
43
TSZ07-AA
5,8
6,2
39
43
(Aktuelle Werte für spezielle Ausrüstungsstufen sind über die Digital Equipment Vertretungen erhältlich.
1 B = 10 dBA.)
Temperature
Operating
without tape
10°C to 40°C
(50°F to 104°F)
Operating
with tape
15°C to 32°C
(59°F to 90°F)
Non-operating
-40°C to 66°C
(-40°F to 151°F)
Storage
5°C to 50°C
(41°F to 122°F)
Operating
without tape
28°C (82°F) max.
Operating
with tape
25°C (77°F) max.
Storage
32°C (90°F) max.
(Wet Bulb Temperature)
A–2 Specifications
Table A–1 (Cont.): TSZ07 Specifications
ENVIRONMENTAL
Relative Humidity
(Noncondensing)
Operating with tape
20% to 80%
Operating without tape
10% to 90%
Non-operating
95% max.
Storage
10% to 95%
2400 m (8,000 ft) max.
Non-operating
9000 m (30,000 ft) max.
Altitude
Operating
PERFORMANCE
Tape Speed
Record
100 ips (2.54 m/s)
Long Term Speed
Variation
±3% of nominal
Instantaneous Speed
Variation
±4% of long term
Load/Unload Time
55 seconds nominal
Ramp Delay
250 milliseconds ±5%
Rewind Time
110 seconds nominal (150 maximum) with 2400 foot tape
Reposition Time
780 ms
Tape Tension
8.0 ounce (226.8 g) nominal
Record Size
1 byte to 64 kilobytes
Data Format
Phase Encoding, 1600 bpi, compatible with ANSI X3.39-1986
Group Code Recording, 6250 bpi, compatible with ANSI X3.54-1986
Specifications A–3
Table A–1 (Cont.): TSZ07 Specifications
PERFORMANCE
SCSI Data Transfer Rates
Mode:
Asynchronous
Synchronous
Cable Length:
Rate (maximum):
1.5 Mb/sec
(Asynchronous)
4.0 Mb/sec
(Synchronous)
Part Number
TSZ07-AA
Single-ended
TSZ07-BA
Single-ended
TSZ07-BB
Single-ended
TSZ07-CA
Single-ended
TSZ07-DA
Differential-ended
TSZ07-EA
Differential-ended
TSZ07-EB
Differential-ended
TSZ07-FA
Differential-ended
Tape Data Capacity (Unformatted)
Density
2400 ft (732m)
Reel Size
15.25
17.78
21.59
26.67
A–4 Specifications
cm
cm
cm
cm
1600 bpi/43 Mb
6250 bpi/160 Mb
(6.0 in) with a minimum of 300 feet of tape
(7.0 in)
(8.5 in)
(10.5 in)
19.68 ft (6 m)
Table A–1 (Cont.): TSZ07 Specifications
POWER
The ac power supply operates on single-phase ac power. The supply provides auto-range operation in either of
two voltage ranges, low or high (see below). The power supply automatically selects the appropriate voltage and
frequency range without any internal or external modification.
Voltages
Nominal
Operating
Low range
High range
100 to 120 V ac
200 to 240 V ac
88 to 140 V ac
176 to 259 V ac
Frequency
Nominal
Operating
Low range
High range
50 Hz
60 Hz
47.5 to 52.5 Hz
57.0 to 63.0 Hz
Power Consumption
250 W nominal
400 W maximum
TAPE
Tape used must be half-inch (12.7 mm) width computer grade tape that complies to ANSI standard X3.40-1983.
Digital recommends that only 1.5 mil (0.038 mm) be used.
Specifications A–5
Appendix B
Small Computer System Interface (SCSI)
B.1 Introduction
The Small Computer System Interface (SCSI) consists of circuitry and a bus for handling
control signals, messages, status bytes, and commands.
The SCSI 2 generates signals and translates tape drive data and status information into the
appropriate format for the SCSI bus. Commands presented to the SCSI bus are translated
into drive executable commands by the interface.
NOTE
For more information on these topics, please refer to the Small Computer
System Interface: A Developer’s Guide (EK-SCSIS-DK).
B.2 Signals
The definitions of the SCSI signals are provided in Table B–1. On single-ended interfaces,
signals are active-low. Table B–2 provides pinout information for the single-ended connectors.
Table B–3 provides pinout information for the differential-ended connectors.
Small Computer System Interface (SCSI) B–1
Table B–1: SCSI Bus Signals
Signal Name
Description
Acknowledge (ACK)
Set by an initiator to acknowledge a REQ/ACK data transfer handshake.
Attention (AN)
Set by an initiator to indicate the Attention condition.
Busy (BSY)
Indicates that the bus is being used.
Control/Data (C/D)
Indicates whether control information or data is on the bus. A true signal
indicates control.
Data Bits (DB0-7, P)
There are eight data bits and a parity bit. DB7 is the most significant bit
and has the highest priority during arbitration. Parity is odd.
Input/Output (I/O)
This signal controls the direction of data movement on the bus with
respect to an initiator. A true signal indicates input to the initiator. This
signal is also used to distinguish between the Selection and Reselection
phases.
Message (MSG)
This signal is set active by a target during the Message phase.
Request (REQ)
This signal is set active by a target to request a REQ/ACK data
handshake.
Reset (RST)
Indicates the Reset condition.
Select (SEL)
Set active by an initiator to select a target, or by a target to reselect an
initiator.
B–2 Small Computer System Interface (SCSI)
Table B–2: Pin Assignments for the Single-Ended Shielded Connections
Signal
Contact
Number
Contact
Number
Signal †
Ground
1
26
-DB0
Ground
2
27
-DB1
Ground
3
28
-DB2
Ground
4
29
-DB3
Ground
5
30
-DB4
Ground
6
31
-DB5
Ground
7
32
-DB6
Ground
8
33
-DB7
Ground
9
34
-DBP
Ground
10
35
Ground
Ground
11
36
Ground
Ground
12
37
Ground
Open
13
38
TERMPWR
Ground
14
39
Ground
Ground
15
40
Ground
Ground
16
41
-AN
Ground
17
42
Ground
Ground
18
43
-BSY
Ground
19
44
-ACK
Ground
20
45
-RST
Ground
21
46
-MSG
Ground
22
47
-SEL
Ground
23
48
-C/D
Ground
24
49
-REQ
Ground
25
50
-I/O
†A minus sign indicates an active low signal.
Small Computer System Interface (SCSI) B–3
Table B–3: Pin Assignment for the Differential Shielded Connections
Signal
Contact
Number
Contact
Number
Signal
Ground
1
26
Ground
+DB0
2
27
-DB0
+DB1
3
28
-DB1
+DB2
4
29
-DB2
+DB3
5
30
-DB3
+DB4
6
31
-DB4
+DB5
7
32
-DB5
+DB6
8
33
-DB6
+DB7
9
34
-DB7
+DBP
10
35
-DBP
DIFFSENS
11
36
Ground
Open
12
37
Open
TERMPWR
13
38
TERMPWR
Open
14
39
Open
+ATN
15
40
-ATN
Ground
16
41
Ground
+BSY
17
42
-BSY
+ACK
18
43
-ACK
+RST
19
44
-RST
+MSG
20
45
-MSG
+SEL
21
46
-SEL
+C/D
22
47
-C/D
+REQ
23
48
-REQ
+I/O
24
49
-I/O
Ground
25
50
Ground
B–4 Small Computer System Interface (SCSI)
B.3 SCSI Bus Phases
A description of the SCSI bus phases are provided in Table B–4.
Table B–4: SCSI Bus Phases
Bus Phase
Description
Bus control phases:
Bus Free
Indicates that no SCSI device is actively using the bus.
Arbitration
Allows one SCSI device to gain control of the bus.
Selection
Allows an initiator to select a target.
Reselection
Allows the target to reconnect to an initiator.
Information
transfer phases:
Command
Allows the target to request command information from the initiator.
Data
Provides data transfer between the initiator and the target.
Status
Provides status information from the target to the initiator.
Message
Allows the transfer of messages between the initiator and the target.
B.4 SCSI Bus Conditions
The SCSI bus has two asynchronous conditions, the Attention (AN) condition, and the Reset
(RST) condition.
B.4.1 Attention Condition
The Attention (AN) condition allows an initiator to inform a target that the initiator has a
message ready. The target may get this message by performing a Message Out phase.
B.4.2 Reset Condition
The Reset (RST) condition is used to immediately clear all SCSI devices from the bus. This
condition takes precedence over all other phases and conditions. During the Reset condition,
the state of all SCSI bus signals other than RST is not defined.
Small Computer System Interface (SCSI) B–5
B.5 SCSI Message System
The SCSI message system allows communication between an initiator and a target for the
purpose of interface management.
A message may be one, two or multiple bytes in length. One or more messages may be sent
during a single Message phase, but a message may not be split over Message phases. The
initiator is required to end the Message Out phase (by negating AN) when it sends certain
messages.
B.5.1 Messages — Format and Codes
One-byte, two-byte, and extended message formats are defined. The first byte of the message
determines the format as follows:
Table B–5: Messages — Format and Codes
Value
Message Format
00h
One-byte message (COMMAND COMPLETE)
01h
Extended messages
02h-1Fh
One-byte messages
20h-2Fh
Two-byte messages
30h-7Fh
Reserved for future standardization
80h-FFh
One-byte message (IDENTIFY)
B–6 Small Computer System Interface (SCSI)
B.5.2 Messages
Table B–6 lists the SCSI messages implemented by Digital in the TSZ07.
Table B–6: SCSI Messages
Message
ABORT
BUS DEVICE RESET
COMMAND COMPLETE
DISCONNECT
IDENTIFY
INITIATOR DETECTED ERROR
MESSAGE PARITY ERROR
MESSAGE REJECT
NO OPERATION
RESTORE POINTERS
SAVE DATA POINTER
SYNCHRONOUS DATA TRANSFER REQUEST
Small Computer System Interface (SCSI) B–7
B.6 Status
A status byte must be sent from the target to the initiator during the Status phase at the
completion of each command.
The contents of the SCSI status byte must conform to rules of the SCSI 2 specification.
Otherwise, there are no restrictions on the use of this byte. Table B–7 lists the status bytes.
Table B–7: Status Bytes
Status Byte
Description
Good
The target has successfully completed the command.
Check Condition
Any error, exception, or abnormal condition that causes sense data to be set must
cause a Check Condition status. The REQUEST SENSE command must be issued
following a Check Condition status, to determine the nature of the condition.
Condition Met
The SEARCH DATA command returns this status whenever a search condition
is satisfied. The logical block address of the logical block that satisfies the search
may be determined with a REQUEST SENSE command. This status is also
returned by the PRE-FETCH command when there is sufficient space in the cache
memory for all of the addressed logical blocks.
Busy
The target is busy. This status is returned whenever a target is unable to
process the command from an otherwise acceptable initiator (that is, there are
no conflicting reservations). The recommended initiator recovery action is to issue
the command again at a later time.
Intermediate
Linked commands are not implemented.
Reservation
Conflict
This status is returned whenever a SCSI device attempts to access a logical unit or
an extent within a logical unit that is reserved with a conflicting reservation type
for another SCSI device. The recommended initiator recovery action is to issue the
command again at a later time.
Queue Full
Tagged queuing is not implemented.
B–8 Small Computer System Interface (SCSI)
B.7 Commands
For a complete discussion of the SCSI commands implemented by Digital, please refer to the
Small Computer Systems Interface: A Developer’s Guide (EK-SCSIS-DK). Table B–8 provides
a list of the supported SCSI commands for the TSZ07.
Table B–8: TSZ07 SCSI Commands
COPY
ERASE
INQUIRY
LOAD/UNLOAD
LOG SENSE
MODE SELECT
MODE SENSE
READ
READ BLOCK LIMITS
READ BUFFER
READ REVERSE
RECOVER BUFFERED DATA
RELEASE UNIT
REQUEST SENSE
RESERVE UNIT
REWIND
SEND DIAGNOSTIC
SPACE
TEST UNIT READY
VERIFY
WRITE
WRITE BUFFER
WRITE FILEMARKS
Small Computer System Interface (SCSI) B–9