Exabyte EXB-8500 Guide

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Copyright
Copyright 1991 by EXABYTE Corporation. All rights reserved. This item and the information
contained herein are the property of EXABYTE Corporation. No part of this document may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language
or computer language in any form or by any means, electronic, mechanical, magnetic, optical,
chemical, manual, or otherwise, without the express written permission of EXABYTE
Corporation, 1685 38th Street, Boulder, Colorado 80301.
Disclaimer
EXABYTE Corporation makes no representation or warranties with respect to the contents of
this document and specifically disclaims any implied warranties of merchantability or fitness for
any particular purpose. Further, EXABYTE Corporation reserves the right to revise this
publication without obligation to notify any person or organization of such revision or changes.
Trademark Notices
EXABYTE is a registered trademark and EXATAPE is a trademark of EXABYTE Corporation.
Pull-A-PLCC is a trademark of Emulation Technology, Inc. TORX is a registered trademark of
Camcar Division of Textron, Inc.
Revision History for 510204
Previous revisions of this manual include the following:
Revision Date
000 August 1991 (initial release)
For information about the changes and enhancements to this revision, refer to page iv.
ii 510204

Product Warranty Caution
The EXB-8500 8mm Cartridge TapeSubsystem (EXB-8500) iswarranted tobe freefrom defects
in materials, parts, and workmanship and will conform to the current product specification upon
delivery. For the specific details of your warranty, refer to your sales contract or contact
the company from which the EXB-8500 was purchased.
The warranty for the EXB-8500 shall not apply to failures of any unit when:
■The EXB-8500 is repaired by anyone other than the Manufacturer’s personnel or
approved agent.
■The EXB-8500 is physically abused or is used in a manner that is inconsistent with the
operating instructions or product specification defined by the Manufacturer.
■The EXB-8500 fails because of accident, misuse, abuse, neglect, mishandling,
misapplication, alteration, faulty installation, modification, or service by anyone other
than the factory service center or its approved agent.
■The EXB-8500 is repaired by anyone, including an approved agent, in a manner that is
contrary to the maintenance or installation instructions supplied by the Manufacturer.
■The Manufacturer’s serial number tag is removed.
■The EXB-8500 is damaged because of improper packaging on return.
CAUTION
Returning the EXB-8500 in unauthorized packaging may damage the unit and void
the warranty.
If you are returning the EXB-8500 for repair, package it in its original packaging (or
in replacement packaging obtained from your vendor). Refer to the packing
instructions in the EXB 8500 8mm Cartridge Tape Subsystem User’s Manual.
If problems with the EXB-8500 occur, contact your maintenance organization; do not void the
product warranty by allowing untrained or unauthorized personnel to attempt repairs.
October 1991 iii

Changes and Enhancements to This Manual
This revision of EXB-8500 8mm Cartridge Tape Subsystem Maintenance includes the following
changes and enhancements:
■Updated Chapters 4 and 9 to describe different versions of the KRW card and top cover.
■Added Chapter 18 to describe how to adjust the servo read amplitude for the newer
version of the KRW card.
■Updated regulatory and safety agency standards.
■Updated torque values in all chapters whose instructions involve removing and replacing
screws.
iv 510204

Contents
1GeneralInformation..............................1-3
1.1AboutThisManual............................1-3
IntendedAudience...........................1-4
RelatedPublications..........................1-5
1.2 Regulatory and Safety Agency Standards . . . . . . . . . . . . . . . 1-5
1.3OtherTestStandards ..........................1-6
2ApproachestoMaintainingtheEXB-8500..................2-1
2.1RequiredToolsandEquipment.....................2-1
2.2RequiredTestEquipment........................2-3
TestSoftware..............................2-3
TestTapes...............................2-3
2.3StaticProtectionRequirements.....................2-4
2.4 Recommended Approaches to Maintenance . . . . . . . . . . . . . . 2-4
Test the EXB-8500 before Replacing Parts . . . . . . . . . . . . . . 2-4
ReplaceParts .............................2-5
TesttheEXB-8500AfterReplacingParts...............2-6
3R-PackReplacement .............................3-3
3.1RequiredTools .............................3-3
3.2RemovinganR-Pack ..........................3-4
3.3InstallinganR-Pack...........................3-5
3.4TestingtheReplacement ........................3-6
4TopCoverReplacement ...........................4-1
4.1RequiredTools .............................4-2
4.2RemovingtheTopCover ........................4-3
4.3ReplacingtheTopCover ........................4-4
4.4TestingtheReplacement ........................4-5
5DoorReplacement ..............................5-1
5.1RequiredTools .............................5-1
5.2RemovingtheDoor ...........................5-1
5.3ReplacingtheDoor ...........................5-3
October 1991 v

6FaceplateReplacement ...........................6-1
6.1RequiredTools .............................6-1
6.2RemovingtheFaceplate ........................6-2
6.3ReplacingtheFaceplate ........................6-4
7CardRetainerReplacement .........................7-1
7.1RequiredTools .............................7-1
7.2PreparingtheEXB-8500 ........................7-1
7.3RemovingtheCardRetainers......................7-2
7.4ReplacingtheCardRetainers......................7-3
7.5ReassemblingtheEXB-8500......................7-3
7.6TestingtheReplacement........................7-3
8DeckHangerReplacement..........................8-1
8.1RequiredTools .............................8-2
8.2PreparingtheEXB-8500 ........................8-2
8.3RemovingtheDeckHanger.......................8-3
8.4ReplacingtheDeckHanger.......................8-4
8.5ReassemblingtheEXB-8500......................8-5
8.6TestingtheReplacement........................8-5
9EdgeMountedCardReplacement......................9-1
9.1RequiredTools .............................9-2
9.2PreparingtheEXB-8500 ........................9-2
9.3 Removing an Edge Mounted Card . . . . . . . . . . . . . . . . . . . 9-3
9.4ReplacingtheKRWCard........................9-4
DetachingtheKRWCard’sRibbonCable...............9-4
Compatibility of the KRW Card with the Top Cover . . . . . . . . . . 9-5
9.5ReplacinganEdgeMountedCard ...................9-6
9.6ReassemblingtheEXB-8500......................9-7
9.7AdjustingtheServoReadAmplitude..................9-7
9.8TestingtheReplacement........................9-7
10SYSCardCoverReplacement ...................... 10-1
10.1RequiredTools............................ 10-1
10.2RemovingtheSYSCardCover................... 10-2
10.3ReplacingtheSYSCardCover ................... 10-3
10.4AdjustingtheHeadSyncTiming................... 10-3
10.5TestingtheReplacement ...................... 10-3
vi 510204

11SYSCardReplacement..........................11-1
11.1RequiredTools............................11-1
11.2PreparingtheEXB-8500.......................11-2
11.3RemovingtheMountingScrews...................11-3
11.4 Disconnecting the SYS Card Connectors . . . . . . . . . . . . . . 11-4
11.5ReconnectingtheSYSCardConnectors ..............11-7
11.6 Reattaching the SYS Card to the Main Housing . . . . . . . . . . . 11-7
11.7ReassemblingtheEXB-8500 ....................11-8
11.8 Loading Microcode onto a New SYS Card . . . . . . . . . . . . . . 11-8
11.9AdjustingtheHeadSyncTiming...................11-8
11.10TestingtheReplacement......................11-9
12DeckAssemblyReplacement.......................12-1
12.1RequiredTools............................12-1
12.2PreparingtheEXB-8500.......................12-2
12.3RemovingtheDeck .........................12-2
12.4ReplacingtheDeck .........................12-3
12.5ReassemblingtheEXB-8500 ....................12-3
12.6AdjustingtheHeadSyncTiming...................12-3
12.7TestingtheReplacement.......................12-4
13MainHousingReplacement........................13-1
13.1RequiredTools............................13-1
13.2PreparingtheEXB-8500.......................13-2
13.3RemovingtheMainHousing.....................13-2
13.4ReplacingtheMainHousing.....................13-3
13.5ReassemblingtheEXB-8500 ....................13-3
13.6AdjustingtheHeadSyncTiming...................13-3
13.7TestingtheReplacement.......................13-3
14CleaningtheEXB-8500 ..........................14-3
15LoadingNewMicrocodetotheEXB-8500................15-1
15.1DecidingWhichLoadingMethodtoUse...............15-1
15.2 Where to Find Code Loading Information . . . . . . . . . . . . . . 15-1
16RemovingTapefromtheTapePath ...................16-1
16.1BeforeStartingtheProcedure....................16-1
PreliminaryProcedure........................16-2
RequiredTools............................16-2
16.2PreparingtheEXB-8500.......................16-2
October 1991 vii

16.3PreparingtheDataCartridge .................... 16-3
16.4 Removing the Erase Head Bracket and Tape Guide . . . . . . . . 16-4
16.5 Removing the Tape from the Tape Path . . . . . . . . . . . . . . . 16-6
16.6RemovingtheDoorandFaceplate ................. 16-8
16.7 Winding the Loose Tape and Ejecting the Data Cartridge . . . . . . 16-9
16.8ReassemblingtheEXB-8500 ....................16-10
17AdjustingtheHeadSyncTiming..................... 17-1
17.1RequiredEquipment......................... 17-1
17.2UsingtheHeadSyncTape ..................... 17-2
18AdjustingtheServoReadAmplitude .................. 18-1
18.1RequiredToolsandEquipment ................... 18-1
18.2PreparingtheEXB-8500....................... 18-2
18.3 Adjusting the Servo Read Amplitude for EXB-8200 Format . . . . . 18-4
18.4 Adjusting the Servo Read Amplitude for EXB-8500 Format . . . . . 18-5
19ReplacingtheBootPROM ........................ 19-1
19.1RequiredTools............................ 19-1
19.2PreparingtheEXB-8500....................... 19-2
19.3 Removing and Replacing the Boot PROM . . . . . . . . . . . . . 19-3
RemovingtheExistingBootPROM................. 19-3
InstallingaNewBootPROM .................... 19-4
19.4ReassemblingtheEXB-8500 .................... 19-5
viii 510204

Figures
Figure 3-1 Location of R-Packs (Back View of EXB-8500) . . . . . . . . . . . . . . . 3-4
Figure 4-1 LocationofTopCoverScrews .......................4-3
Figure 5-1 Location of Door Release Lever (Side View of EXB-8500) . . . . . . . . . 5-2
Figure 5-2 Separating the Door Parts (Front View of EXB-8500) . . . . . . . . . . . 5-2
Figure 5-3 Position of Door, Door Retainer, and Door Bracket . . . . . . . . . . . . . 5-3
Figure 6-1 Location of Door Release Lever (Side View of EXB-8500) . . . . . . . . . 6-2
Figure 6-2 LocationofFaceplateScrews........................6-3
Figure 8-1 Deck Hanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Figure 8-2 Correct Position of Deck Hanger’s Copper Shield . . . . . . . . . . . . . 8-4
Figure 9-1 Edge Connector Mounted Cards . . . . . . . . . . . . . . . . . . . . . . 9-3
Figure 9-2 KRWCardwithBusBar...........................9-5
Figure 9-3 KRWCardwithSprings...........................9-5
Figure 9-3 Compatibility of the KRW Card with the Top Cover . . . . . . . . . . . . . 9-6
Figure 10-1 SYS Card Cover Screws (EXB-8500 Shown Upside Down) . . . . . . . 10-2
Figure 11-1 SYS Card Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
Figure 11-2 SYS Card Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Figure 11-3 SYS Card Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6
Figure 12-1 Location of Deck Screws . . . . . . . . . . . . . . . . . . . . . . . . 12-2
Figure 13-1 Removing the Main Housing . . . . . . . . . . . . . . . . . . . . . . . 13-2
Figure 16-1 Taping Open the Data Cartridge Door . . . . . . . . . . . . . . . . . . 16-3
Figure 16-2 Location of Screw for Erase Head Bracket . . . . . . . . . . . . . . . 16-4
Figure 16-3 EXB-8500 with Tape Loaded (Tape Guide and Erase Head Bracket
Removed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-7
Figure 18-1 Location of Test Points on KRW Card . . . . . . . . . . . . . . . . . . 18-2
Figure 18-2 Location of Ground Points on the KRW Card . . . . . . . . . . . . . . 18-3
Figure 18-3 Oscilloscope Reading for EXB-8200 Format Servo Read Amplitude . . 18-5
Figure 18-4 Oscilloscope Reading with No Delay . . . . . . . . . . . . . . . . . . 18-6
Figure 18-5 Oscilloscope Reading for EXB-8500 Format Servo Read Amplitude . . 18-7
Figure 19-1 Location of Boot PROM on the SYS Card . . . . . . . . . . . . . . . . 19-3
Figure 19-2 Location of Notch in Boot PROM . . . . . . . . . . . . . . . . . . . . 19-4
October 1991 ix

Tables
Table 2-1 Tools Needed for EXB-8500 Maintenance Procedures . . . . . . . . . . . 2-2
Table 2-2 Tests and Procedures to Perform after Replacing FRUs . . . . . . . . . . 2-7
Table 4-1 Compatibility of the Top Cover with the KRW Card . . . . . . . . . . . . . 4-1
x510204

Part 1
Preparing for Maintenance

1 General Information
This manual provides instructions for performing maintenance procedures on
the EXABYTE®EXB 8500 Cartridge Tape Subsystem (EXB 8500). It lists
the diagnostic tools available for the EXB 8500 and recommends approaches
to analyzing failures and verifying fixes. It explains how to load upgrades to
firmware, clean the tape path, and remove, replace, and adjust field
replaceable units (FRUs).
1.1 About This Manual
This manual contains the information described below.
Part 1 - Preparing for Maintenance
To prepare for EXB-8500 maintenance, read Chapters 1 and 2. These chapters
contain the following:
■Chapter 1 provides general information about the EXB-8500, including
information about using this manual, related publications, and the
EXB 8500’s compliance with regulatory and safety agency standards.
■Chapter 2 contains information about the tools and materials you need to
test and maintain the EXB-8500 and describes recommended approaches
to testing and maintaining the EXB-8500.
Part 2 - Replacing Field Replaceable Units
Chapters 3 through 13 provide step-by-step instructions for removing and
replacing EXB-8500 field replaceable units (FRUs). These chapters also
recommend tests to perform after a part has been replaced to ensure that it
was replaced correctly. Instructions for replacing the following FRUs are
included:
■R-packs (terminators)
■Top cover
■Door
■Faceplate
■Card retainer
■Deck hanger
■Edge mounted cards (DIF/SIF, KCD, and KRW cards)
■SYS card cover (bottom cover)
■SYS card
■Deck assembly
■Main housing
October 1991 1-3
1General Information

Part 3 - Performing Other Maintenance Procedures
Chapters 14 through 17 contain additional maintenance procedures that
should be performed as needed. The following information is included:
■Chapter 14 contains instructions for cleaning the EXB 8500.
■Chapter 15 provides a brief discussion on loading new firmware to the
EXB-8500.
■Chapter 16 contains instructions for removing tape from the tape path of a
nonfunctioning EXB 8500.
■Chapter 17 contains instructions for using the automatic head sync tape to
adjust the head sync timing for the EXB 8500.
■Chapter 18 contains instructions for adjusting the servo read amplitude for
the EXB-8500 for both 8200 and 8500 read modes.
■Chapter 19 contains instructions for replacing the boot PROM located on
the EXB-8500’s SYS card.
■A glossary, index, and reader’s comment form are included at the back of
this manual.
Intended Audience
This manual is provided to assist EXABYTE self-maintenance contract
customers in the testing and maintenance of the EXB-8500.
IMPORTANT
The procedures in this manual must be performed by a qualified
service technician whose organization has a self-maintenance
agreement with EXABYTE Corporation. If these steps are performed
by a non-qualified individual, the product warranty will be voided.
1-4 510204
1General Information

Related Publications
The following manuals and user’s guides will help you understand some of
the tasks referred to in this manual.
■EXB-8500 8mm Cartridge Tape Subsystem User’s Manual, 510201
■EXB-8500 8mm Cartridge Tape Subsystem Product Specification, 510200
■EXPERT User’s Guide, 510010
■Monitor User’s Guide for the EXB-8500 8mm Cartridge Tape Subsystem,
510206
1.2 Regulatory and Safety Agency Standards
When purchased from EXABYTE Corporation, the EXB-8500 is certified as
a component by the following domestic and international product safety
standards. Certification of the final product is the responsibility of the system
integrator.
■UL Standard 1950, 1st Edition, Information Technology Equipment
■UL Standard 478, 4th Edition, Electronic Data Processing Units and
Systems
■CSA Standard certified C22.2 No. 220-M1986, Information Processing
and Business Equipment
■CAN/CSA Standard C22.2 No. 950-M89, Safety of Information
Technology Equipment (pending)
■IEC 950/EN60950, Safety of Information Technology Equipment
including Electrical Business Equipment (TUV)
When integrated into a final product, the EXB-8500 is designed to meet the
requirements of the following agencies:
■FCC Rules, Part 15, Class B, Computing Devices
■Canadian Department of Communications, Radio Interference Regulation,
Digital Apparatus, Class B
■VDE Vfg 1046/1984, Class B
■CISPR Publication 22, 1985, Class A
October 1991 1-5
1General Information

1.3 Other Test Standards
When shipped, the EXB-8500 is packaged in a manner that complies with the
testing criteria defined by National Safe Transit Association (NSTA) Project 1.
1-6 510204
1General Information

2 Approaches to Maintaining the EXB-8500
This chapter lists the tools and equipment required for testing and maintaining
the EXB 8500 and describes the recommended approaches to maintaining the
EXB 8500.
2.1 Required Tools and Equipment
Refer to Table 2-1 on page 2-2 to determine the tools you need to perform the
procedures described in this manual. Also, a list of the tools needed for a
procedure is provided in the chapter for the procedure.
Note: In Table 2-1, the term “T-# bit” indicates a specific size of TORX®
driver bit for a torque-limiting screwdriver, 3.4 to 5.0 inch-pounds
(3.9 to 5.8 kg-cm).
October 1991 2-1
2Approaches to Maintaining the EXB-8500

To replace
this part or
perform this
procedure . . .
You will need the following tools . . .
T-10 bit T-8 bit Tweezers #0 Phillips screwdriver #1 Phillips screwdriver #1 flat-blade screwdriver Flat-nose pliers Potentiometer adjustment tool PROM removal toola EXABYTE 8mm Cleaning Cartridgeb EXABYTE automatic head sync tapec Adhesive tape Microcode filed Servo read amplitude adjustment toolse
Boot PROM ✓✓ ✓
Card retainer ✓✓
Cleaning ✓
Deck assembly ✓✓✓ ✓✓
Deck hanger ✓✓ ✓✓
Door ✓✓ ✓
Faceplate ✓✓✓✓
Head sync ✓
KCD card ✓✓
KRW card ✓✓ ✓✓ ✓ ✓
Main housing ✓✓ ✓✓ ✓ ✓
Microcode ✓
R-pack ✓
SIF or DIF card ✓✓
SYS card ✓✓✓ ✓✓ ✓ ✓
SYS card
cover ✓✓
Tape
removal ✓✓✓✓✓✓ ✓ ✓
Top cover ✓✓
aSuch as Emulation Technology’s Pull-A-PLCC™.
bOr an EXABYTE-manufactured 8mm cleaning cartridge.
cEXABYTE automatic head sync tape for the EXB-8500, part number 180025.
dDepending on your requirements, you can load new microcode in one of three ways. See Chapter 15.
eAdditional tools required to adjust the servo read amplitude include: EXPERT software, a blank EXATAPE, and
an oscilloscope. See Chapter 18 for instructions.
Table 2-1 Tools Needed for EXB-8500 Maintenance Procedures
2-2 510204
2Approaches to Maintaining the EXB-8500

2.2 Required Test Equipment
To perform tests on the EXB-8500 before and after replacing FRUs, you need
the test software and tapes described in this section.
Test Software
EXABYTE recommends the following software and accompanying user’s
guides for testing the EXB-8500:
■EXABYTE EXPERT software (version 6.53 or later) and equipment
required to run EXPERT. EXPERT tests are designed to evaluate the
performance of the EXB-8500 during specific types of operations. For
more information about EXPERT and the equipment required to run
EXPERT, refer to the EXPERT User’s Guide.
■EXABYTE Monitor software for the EXB 8500 (version 10.01 or later)
and equipment required to run Monitor. For more information on Monitor
and the equipment required to run Monitor, refer to the Monitor User’s
Guide for the EXB 8500 8mm Cartridge Tape Subsystem.
Test Tapes
This section describes the tapes that are required to test the EXB 8500 and the
methods you should follow when creating these tapes. Label the tapes
appropriately for easy identification.
Write/Read Test Tape This is an EXATAPE 112m tape. To make this
tape, run the EXPERT Inter_chg test in 8200 mode on the EXB-8500
being tested. Then, read the tape on a known good EXB-8500 to verify
interchangeability.
8200 Mode Interchange Test Tape This is an EXATAPE 112m tape.
To make this tape, run the EXPERT Chg_WrtRd test with the density
code option set for 8200 mode (14h) on the EXB-8500 being tested. Then,
read the tape on a known good EXB-8500 (or EXB-8200 if available).
Carefully check the test tapes to ensure that any failures reported by EXPERT
are EXB-8500-related rather than tape-related. If a media error occurs, repeat
the test with a known good tape to verify that the failure is EXB 8500-related.
October 1991 2-3
2Approaches to Maintaining the EXB-8500

2.3 Static Protection Requirements
The testing and maintenance environments for the EXB-8500 must be free of
conditions that could cause electrostatic discharge (ESD). To ensure that these
environments are as free from ESD as possible, follow these procedures when
testing and maintaining the EXB-8500:
■Static protection for the testing environment
❏Ensure that the power supply connected to the EXB-8500 is properly
grounded.
❏Ensure that the personal computer used for EXPERT and Monitor
software and for the SCSI bus is properly grounded.
■Static protection for the maintenance environment
❏Placeastaticprotectionmatontheworksurface.Usea1-megohm
resistor to ground the static protection mat.
❏Wear a static protection wrist band whenever you handle the
EXB-8500 or EXB-8500 cards that have been removed from their
antistatic bags. Connect this wrist band to the static protection mat or
to other suitable ESD grounding.
❏Keep all cards in antistatic bags when not in use.
2.4 Recommended Approaches to Maintenance
For best results when maintaining the EXB 8500, EXABYTE recommends
the following approaches.
Test the EXB-8500 before Replacing Parts
When a problem arises with the EXB 8500, test the EXB 8500 before
performing any maintenance procedures to determine the problem and
possible solutions. Follow these testing guidelines:
■Use the test equipment listed in Section 2.2 to perform these tests.
■Make sure the test environment meets the static protection requirements
listed in Section 2.3.
2-4 510204
2Approaches to Maintaining the EXB-8500