Exabyte EXB-8500 Maintenance Manual
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Exabyte EXB-8500 Maintenance Manual

8 mm catridge tape subsystem
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  • Page 1 (;% PP &DUWULGJH 7DSH 6XEV\VWHP 0DLQWHQDQFH ...
  • Page 2 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...
  • Page 3 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.
  • Page 4 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.

  • Page 5: Table Of Contents

    1.3 Other Test Standards ......1-6 2 Approaches to Maintaining the EXB-8500 ....2-1 2.1 Required Tools and Equipment .
  • Page 6 7.1 Required Tools ......7-1 7.2 Preparing the EXB-8500 ......7-1 7.3 Removing the Card Retainers .
  • Page 7 13.7 Testing the Replacement ..... . . 13-3 14 Cleaning the EXB-8500 ......14-3 15 Loading New Microcode to the EXB-8500 .
  • Page 8 18.1 Required Tools and Equipment ....18-1 18.2 Preparing the EXB-8500 ..... . . 18-2 18.3 Adjusting the Servo Read Amplitude for EXB-8200 Format .
  • Page 9 Figures Figure 3-1 Location of R-Packs (Back View of EXB-8500) ....3-4 Figure 4-1 Location of Top Cover Screws ..... . . 4-3 Figure 5-1 Location of Door Release Lever (Side View of EXB-8500) .
  • Page 10 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 .
  • Page 11 Part 1 Preparing for Maintenance...

  • Page 13: General Information

    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.

  • Page 14: Intended Audience

    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.

  • Page 15: Related Publications

    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...

  • Page 16: Other Test Standards

    1 General 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. 510204...

  • Page 17: Approaches To Maintaining The Exb-8500

    2 Approaches to Maintaining the EXB-8500 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.

  • Page 18: Table 2-1 Tools Needed For Exb-8500 Maintenance Procedures

    Such as Emulation Technology’s Pull-A-PLCC™. Or an EXABYTE-manufactured 8mm cleaning cartridge. EXABYTE automatic head sync tape for the EXB-8500, part number 180025. Depending on your requirements, you can load new microcode in one of three ways. See Chapter 15. Additional tools required to adjust the servo read amplitude include: EXPERT software, a blank EXATAPE, and an oscilloscope.

  • Page 19: Required Test Equipment

    2 Approaches 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...

  • Page 20: Static Protection Requirements

    2 Approaches 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...

  • Page 21: Replace Parts

    2 Approaches to Maintaining the EXB-8500 Use a known good power supply for each EXB-8500 under test to verify operation and to eliminate any outside influences on the test. Verify that all power to the test area is clean and free of feedback or inductive spikes.

  • Page 22: Test The Exb-8500 After Replacing Parts

    EXB 8500 8mm Cartridge Tape Subsystem. When you replace the SYS card, SYS card cover, deck, or main housing, you must also use the automatic head sync tape from EXABYTE to adjust the head sync timing (see Chapter 17). When you replace the KRW card, you must also adjust the servo read amplitude (see Chapter 18).
  • Page 23 2 Approaches to Maintaining the EXB-8500 Table 2-2 Tests and Procedures to Perform after Replacing FRUs Field Replaceable Tests or Procedures to Discussed in... Unit (FRU) Perform after Replacement Card retainer EXPERT WrtVari Chapter 7 EXPERT WrtVari Deck assembly EXPERT Motion...
  • Page 24 2 Approaches to Maintaining the EXB-8500 Notes: 510204...
  • Page 25 Part 2 Replacing Field Replaceable Units...

  • Page 27: Pack Replacement

    10-pin 9-resistor Single in-line package (SIP) Socket-mounted 110 ohms The differential version of the EXB-8500 (DIF card) does not use internal R-packs. WARNING Before starting any replacement procedures, make sure that the EXB-8500 is not in use, as follows: 1. Make sure that any current operation has completed and that tape motion has stopped.

  • Page 28: Removing An R-Pack

    3.2 Removing an R-Pack To remove an R-pack, follow these steps: 1. Locate the two R-packs on the back of the EXB-8500. Figure 3-1 shows the locations of these R-packs, labeled RP1 and RP2. 2. Using a pair of flat-nose pliers, grasp either one of the R-packs in the center.

  • Page 29: Installing An R-Pack

    If you replace the R-packs, be sure to use the correct size and type of terminators. Otherwise, damage to the EXB-8500 can occur. The EXB-8500 uses two 10-pin, 9-resistor SIP terminators of 110 ohms. Replacement R-packs are available from EXABYTE (part number 002228).

  • Page 30: Testing The Replacement

    3 R-Pack Replacement 3.4 Testing the Replacement To test the replacement of an R-pack, run the EXPERT WrtVari test. If the test fails, check the EXPERT trace log for causes and to help determine the appropriate action to take. Note: Refer to the EXPERT User’s Guide for more information on running EXPERT tests.

  • Page 31: Top Cover Replacement

    4 Top Cover Replacement 4 Top Cover Replacement This chapter describes how to remove and replace the top cover. Compatibility of the Top Cover with the KRW Card There are two versions of the top cover: One version has a conductive gasket on its underside. The other version does not have a conductive gasket on its underside.

  • Page 32: Required Tools

    2. Unload the data cartridge by pressing the unload button or issuing a LOAD/UNLOAD (1Bh) command to the EXB-8500. 3. Disconnect the power cord from the EXB-8500. 4. Disconnect the SCSI cable from the EXB-8500. 5. Move the EXB-8500 to the maintenance area.

  • Page 33: Removing The Top Cover

    Use a T-10 TORX bit for the remaining three screws. 2. Gently lift the cover at the rear of the EXB-8500 so that the tabs located at the rear and on each side of the top cover are clear of the main housing.

  • Page 34: Replacing The Top Cover

    EXB-8500 and the two downward bent tabs toward the rear of the EXB-8500. 2. Slide the cover toward the front of the EXB-8500 so that the flat tabs are inserted into the corresponding slots on the faceplate.

  • Page 35: Testing The Replacement

    4 Top Cover Replacement 4.4 Testing the Replacement To test the replacement of the top cover, run the EXPERT WrtVari test. If the test fails, check the EXPERT trace log for causes and to help determine the appropriate action to take. Note: Refer to the EXPERT User’s Guide for more information on running EXPERT tests.
  • Page 36 4 Top Cover Replacement Notes: 510204...

  • Page 37: Door Replacement

    1. Open the door by using a small nonconductive tool, such as a potentiometer adjustment tool, to move the door release lever toward the front of the EXB-8500. Figure 5-1 shows the location of the door release lever. The amount of force required to activate the door release lever is slight, and the lever should move no more than one-eighth of an inch.

  • Page 38: Figure 5-1 Location Of Door Release Lever (Side View Of Exb-8500)

    5 Door Replacement Figure 5-1 Location of Door Release Lever (Side View of EXB-8500) 2. Using a flat-blade screwdriver, separate the door from the door retainer. The locking tabs that hold the two together are near the top edge of the door.

  • Page 39: Replacing The Door

    View A in Figure 5-3 shows how the door, the door retainer, and the door bracket are positioned on the EXB-8500. View B shows a side view of the door, the door bracket, and the door retainer.
  • Page 40 5 Door Replacement To replace the door, follow these steps: 1. To avoid damaging tape, ensure that there is no data cartridge in the EXB 8500. 2. Position the door on the arms of the door bracket so that the bottom locking tabs on the door are in the notches on the bottom of the door bracket.

  • Page 41: Faceplate Replacement

    2. Unload the data cartridge by pressing the unload button or issuing a LOAD/UNLOAD (1Bh) command to the EXB-8500. 3. Disconnect the power cord from the EXB-8500. 4. Disconnect the SCSI cable from the EXB-8500. 5. Move the EXB-8500 to the maintenance area.

  • Page 42: Removing The Faceplate

    EXB-8500. 2. Open the door by using a small nonconductive tool, such as a potentiometer adjustment tool, to move the door release lever toward the front of the EXB-8500. Figure 6-1 shows the location of the door release lever. Note: The amount of force required to activate the door release lever is slight, and the lever should move no more than one-eighth of an inch.

  • Page 43: Figure 6-2 Location Of Faceplate Screws

    6 Faceplate Replacement Figure 6-2 Location of Faceplate Screws 6. Position the EXB-8500 so that it is resting on the rear of the main housing with the door facing up. 7. Move the faceplate away from the main housing. October 1991...

  • Page 44: Replacing The Faceplate

    6.3 Replacing the Faceplate To replace the faceplate, follow these steps: 1. Position the EXB-8500 so that it is resting on the rear of the main housing with the door facing up. 2. With the door bracket closed, slide the faceplate around the door frame and align it with the four mounting screws (see Figure 6-2).

  • Page 45: Card Retainer Replacement

    2. Unload the data cartridge by pressing the unload button or issuing a LOAD/UNLOAD (1Bh) command to the EXB-8500. 3. Disconnect the power cord from the EXB-8500. 4. Disconnect the SCSI cable from the EXB-8500. 5. Move the EXB-8500 to the maintenance area.

  • Page 46: Removing The Card Retainers

    7 Card Retainer Replacement 7.3 Removing the Card Retainers To remove a card retainer, follow this step: 1. Grasp the ends of the card retainer between your thumb and first finger and lift straight up. You should feel no resistance when removing a card retainer.

  • Page 47: Replacing The Card Retainers

    EXB-8500. If the cards are aligned squarely in the EXB-8500, the card retainers will slide on with little or no force.
  • Page 48 7 Card Retainer Replacement Notes: 510204...

  • Page 49: Deck Hanger Replacement

    8 Deck Hanger Replacement This chapter describes how to remove and replace the deck hanger, which separates the card section of the EXB-8500 from the deck section. The deck hanger has two functions: The plastic portion of the deck hanger prevents the KRW ribbon cable from interfering with the moving parts of the deck.

  • Page 50: Required Tools

    Torque limiting screwdriver, 3.4 to 5.0 inch-pounds (3.9 to 5.8 kg-cm) T-10 TORX bit T-8 TORX bit #1 flat-blade screwdriver 8.2 Preparing the EXB-8500 To access the deck hanger, first remove these parts in the following order: Top cover Chapter 4...

  • Page 51: Removing The Deck Hanger

    2. Using a #1 flat-blade screwdriver, press one of the tabs toward the rear of the EXB-8500 while pulling up on the same end of the deck hanger. Hold that end of the deck hanger in the unlocked position until you release the other tab.

  • Page 52: Replacing The Deck Hanger

    8 Deck Hanger Replacement 8.4 Replacing the Deck Hanger To replace the deck hanger, follow these steps: 1. From the front of the EXB 8500, position the copper shield so that the left side of it is to the left of the black tab that protrudes from the tape load mechanism.

  • Page 53: Reassembling The Exb-8500

    8 Deck Hanger Replacement 8.5 Reassembling the EXB-8500 To reassemble the EXB-8500, replace these parts in the following order: Card retainers Chapter 7 Top cover Chapter 4 8.6 Testing the Replacement To test the replacement of a deck hanger, perform the following steps: 1.
  • Page 54 8 Deck Hanger Replacement Notes: 510204...

  • Page 55: Edge Mounted Card Replacement

    2. Unload the data cartridge by pressing the unload button or issuing a LOAD/UNLOAD (1Bh) command to the EXB-8500. 3. Disconnect the power cord from the EXB-8500. 4. Disconnect the SCSI cable from the EXB-8500. 5. Move the EXB-8500 to the maintenance area.

  • Page 56: Required Tools

    Known good EXB-8500 EXPERT software Blank EXATAPE Oscilloscope Potentiometer adjustment tool 9.2 Preparing the EXB-8500 The edge connector socket-mounted cards plug into the SYS card. To access these cards, first remove these parts in the following order: Top cover Chapter 4...

  • Page 57: Removing An Edge Mounted Card

    2. Rock the card from left to right to release it from the edge connector socket. This will require a reasonable amount of force since the card fits securely into the socket. 3. Lift the card straight up and out of the EXB-8500. Figure 9-1 Edge Connector Mounted Cards...

  • Page 58: Replacing The Krw Card

    The KRW card, shown in Figure 9-1 on page 9-3, has a ribbon cable connected to it and is the only card with the major components facing the front of the EXB-8500. To remove the KRW card’s ribbon cable, follow these steps: 1.

  • Page 59: Compatibility Of The Krw Card With The Top Cover

    9 Edge Mounted Card Replacement Compatibility of the KRW Card with the Top Cover There are two versions of the KRW card: One version, shown in Figure 9-2, has a bus bar at the top. The other version, shown in Figure 9-3, has two springs at the top. Figure 9-2 KRW Card with Bus Bar Figure 9-3...

  • Page 60: Replacing An Edge Mounted Card

    Before you replace the KRW card, ensure that the new KRW card is compatible with your top cover. If you have a KRW card with springs, remove the gasket from your top cover before reassembling the EXB-8500. 9.5 Replacing an Edge Mounted Card To replace an edge mounted card, follow these steps: 1.

  • Page 61: Reassembling The Exb-8500

    9 Edge Mounted Card Replacement 9.6 Reassembling the EXB-8500 To reassemble the EXB-8500, replace these parts in the following order: Deck hanger Chapter 8 Card retainers Chapter 7 Top cover Chapter 4 9.7 Adjusting the Servo Read Amplitude If you have replaced the KRW card, you must also adjust the servo read amplitude.
  • Page 62 9 Edge Mounted Card Replacement Notes: 510204...

  • Page 63: Sys Card Cover Replacement

    10 SYS Card Cover Replacement 10 SYS Card Cover Replacement This chapter describes how to remove and replace the SYS card cover. This cover also serves as the bottom cover of the EXB-8500. WARNING Before starting any replacement procedures, make sure that the EXB-8500 is not in use, as follows: 1.

  • Page 64: Removing The Sys Card Cover

    10.2 Removing the SYS Card Cover To remove the SYS card cover, follow these steps: 1. Turn the EXB-8500 upside down so that the SYS card cover is facing 2. Use a T-8 TORX bit to remove the six screws that hold the SYS card cover to the main housing.

  • Page 65: Replacing The Sys Card Cover

    10.4 Adjusting the Head Sync Timing After you replace the SYS card cover, you must adjust the head sync timing using the EXABYTE automatic head sync tape for the EXB-8500. For instructions on using this tape, see Chapter 17. 10.5 Testing the Replacement To test the replacement of the SYS card cover, perform these steps: 1.
  • Page 66 10 SYS Card Cover Replacement Notes: 10-4 510204...

  • Page 67: Sys Card Replacement

    Torque limiting screwdriver, 3.4 to 5.0 inch-pounds (3.9 to 5.8 kg-cm) T-10 TORX bit T-8 TORX bit Tweezers #1 flat-blade screwdriver Floppy diskette containing microcode files EXABYTE automatic head sync tape for the EXB-8500, part number 180025 October 1991 11-1...

  • Page 68: Preparing The Exb-8500

    11 SYS Card Replacement 11.2 Preparing the EXB-8500 The SYS card is mounted on the bottom of the EXB 8500 and is the card into which the other cards (KRW, KCD, and SIF or DIF) are inserted. The SYS card performs the functions of a mother board and contains all of the control circuitry.

  • Page 69: Figure 11-1 Sys Card Screws

    11 SYS Card Replacement 11.3 Removing the Mounting Screws Using a T-8 TORX bit, remove the two screws that mount the SYS card to the main housing. Figure 11-1 shows the locations of the screws. Once these screws are removed, the SYS card will be loose and the connectors can be removed.

  • Page 70: Disconnecting The Sys Card Connectors

    To disconnect the SYS card connectors, follow these steps: 1. Turn the EXB-8500 so that it is resting on its side with the bottom facing toward you and the front facing to your left. 2. Pull the SYS card away from the main housing so that you can access the connectors.

  • Page 71: Figure 11-2 Sys Card Connectors

    11 SYS Card Replacement Figure 11-2 SYS Card Connectors 3. Starting with the connector closest to the rear of the EXB-8500, remove all of the connectors along the edge facing you. Note: Use a pair of tweezers (or similar tool) to push down on the bottom of the key portion of the connector plug, then push the plug away from the SYS card connector socket.

  • Page 72: Figure 11-3 Sys Card Connectors

    Figure 11-3 SYS Card Connectors 4. Turn the EXB-8500 so that it is resting on its back with the front facing 5. Pull the SYS card away from the main housing and remove all of the connectors along the front edge of the card.

  • Page 73: Reconnecting The Sys Card Connectors

    To reconnect the SYS card connections, follow the instructions for removing the SYS card connections in reverse order, as follows: 1. Start at the rear of the EXB-8500 and work around to the front. 2. Then, work across the front and back toward the rear.

  • Page 74: Reassembling The Exb-8500

    85E- xxxx .BIN Customer-specific code, where xxxx is the code level Use the EXB-8500 Monitor program to load the new code from these files onto your SYS card. For more information about using the Monitor program, refer to the Monitor User’s Guide for the EXB 8500 8mm Cartridge Tape Subsystem.

  • Page 75: Testing The Replacement

    11 SYS Card Replacement 11.10 Testing the Replacement To test the replacement of the SYS card, do the following: 1. Run the EXPERT Inter_chg test. 2. Run the EXPERT WrtVari test. 3. Run the EXPERT Motion test. If any EXPERT test fails, check the EXPERT trace log for causes and to help determine the appropriate action to take.
  • Page 76 11 SYS Card Replacement Notes: 11-10 510204...

  • Page 77: Deck Assembly Replacement

    To replace the deck assembly, you need the following tools: T-10 TORX bit T-8 TORX bit #1 flat-blade screwdriver #1 Phillips screwdriver Pointed, non-conductive tool, such as a potentiometer adjustment tool EXABYTE automatic head sync tape for the EXB-8500, part number 180025 October 1991 12-1...

  • Page 78: Preparing The Exb-8500

    1. Using a #1 Phillips screwdriver, remove the four Phillips screws that mount the deck to the main housing, as shown in Figure 12-1. 2. Carefully push the deck out the front of the EXB-8500 and away from the main housing.

  • Page 79: Replacing The Deck

    To replace the deck, follow these steps: 1. Carefully slide the new deck in place and start the four mounting screws to hold the deck in place while you are reassembling the EXB-8500. Do not tighten these screws yet. 2. Install the faceplate from the old deck on the new deck (see Chapter 6).

  • Page 80: Testing The Replacement

    12 Deck Assembly Replacement 12.7 Testing the Replacement To test the replacement of the deck, do the following: 1. Run the EXPERT Inter_chg test. 2. Run the EXPERT WrtVari test. 3. Run the EXPERT Motion test. If any EXPERT test fails, check the EXPERT trace log for causes and to help determine the appropriate action to take.

  • Page 81: Main Housing Replacement

    Torque limiting screwdriver, 3.4 to 5.0 inch-pounds (3.9 to 5.8 kg-cm) T-10 TORX bit T-8 TORX bit #1 flat-blade screwdriver Pointed, non-conductive tool, such as a potentiometer adjustment tool EXABYTE automatic head sync tape for the EXB-8500, part number 180025 October 1991 13-1...

  • Page 82: Preparing The Exb-8500

    1. Grasp the main housing by the sides toward the front. 2. Spread the sides of the main housing apart. 3. Push the main housing away from the rest of the EXB-8500 until it is completely separate from the deck and cards, as shown in Figure 13-1.

  • Page 83: Replacing The Main Housing

    The screws for the SYS card cover should go through the SYS card cover and SYS card before they go into the main housing. 13.5 Reassembling the EXB-8500 To reassemble the EXB-8500, replace these parts in the following order: SYS card cover Chapter 10 Card retainers...
  • Page 84 13 Main Housing Replacement Notes: 13-4 510204...
  • Page 85 Part 3 Performing Other Maintenance Procedures...
  • Page 87 14 Cleaning the EXB-8500 14 Cleaning the EXB-8500 The EXB-8500’s heads and tape path should be cleaned on a regular basis. The only cleaning material authorized for use with the EXB-8500 is an EXABYTE-manufactured 8mm cleaning cartridge. IMPORTANT Using cloth swabs, cotton swabs, cleaning agents, or non-EXABYTE cleaning cartridges will void the warranty on the EXB-8500.
  • Page 88 EXB-8500. Leave the door open. 2. Place the cleaning cartridge in the EXB-8500 and close the door. The EXB-8500 automatically performs the remainder of the cleaning cycle. When the cleaning cycle is complete, the cleaning cartridge is unloaded and ejected from the EXB-8500.

  • Page 89: Loading New Microcode To The Exb-8500

    15 Loading New Microcode to the EXB-8500 When a new firmware release becomes available, you can download the microcode to the EXB-8500 in one of three ways: Using a microcode update tape (part number 180026) Using the EXB-8500 Monitor program...
  • Page 90 15 Loading New Microcode to the EXB-8500 Notes: 15-2 510204...

  • Page 91: Removing Tape From The Tape Path

    This chapter describes how to remove a data cartridge and tape that is loaded in the tape path of a nonfunctioning EXB-8500. Use this procedure only as a last option when it is necessary to preserve the data on the tape. Removing a data cartridge from a nonfunctioning EXB 8500 involves these steps: 1.

  • Page 92: Preliminary Procedure

    16 Removing Tape from the Tape Path Preliminary Procedure Before attempting the tape removal procedure, power the EXB-8500 off and back on again to attempt to clear a possible hang condition. If the green LED is lit, indicating Ready status, press the unload button or issue a LOAD/UNLOAD (1Bh) SCSI command to unload the data cartridge.

  • Page 93: Figure 16-1 Taping Open The Data Cartridge Door

    16 Removing Tape from the Tape Path 16.3 Preparing the Data Cartridge To avoid damaging the tape with the data cartridge door during this procedure, you must tape open the data cartridge door. To tape the door open, follow these steps: 1.

  • Page 94: Figure 16-2 Location Of Screw For Erase Head Bracket

    16 Removing Tape from the Tape Path 16.4 Removing the Erase Head Bracket and Tape Guide The erase head bracket, shown in Figure 16-2, is a molded black plastic part mounted onto two posts. The erase head is attached to the bracket where the wires emerge and lead to the connector on the SYS card.
  • Page 95 3. Position the erase head bracket so that it is hanging over the side of the EXB-8500 and away from the tape path. 4. Gently lift the tape guide straight up at the primary mounting post, so that it is removed from all three posts at the same time.

  • Page 96: Removing The Tape From The Tape Path

    Figure 16-3, by positioning the tool between the tape and the rotating head and moving the tool toward the rear of the EXB-8500. This pulls the tape off of the takeup reel and makes a loose loop in the tape.

  • Page 97: Figure 16-3 Exb-8500 With Tape Loaded (Tape Guide And Erase Head Bracket Removed)

    Figure 16-3 EXB-8500 with Tape Loaded (Tape Guide and Erase Head Bracket Removed) 5. Remove the tape from around the guide posts and rollers at points 3 and 4, shown in Figure 16-3. Be sure to place the tool inside the tape loop to avoid touching the tape recording surface or the head assembly.

  • Page 98: Removing The Door And Faceplate

    16 Removing Tape from the Tape Path 6. Position the tool between points 4 and 5 inside the tape loop. Point 5, shown in Figure 16-3, is an “L” shaped molded black plastic part. The “L” is mounted upside-down and prevents the tape from riding up over the rotating drum.

  • Page 99: Winding The Loose Tape And Ejecting The Data Cartridge

    To wind the loose tape and eject the data cartridge, follow these steps: 1. Position the EXB-8500 so that it is resting on the left side of the main housing with the door facing to your left.

  • Page 100: Reassembling The Exb-8500

    9. Replace the erase head bracket, attaching it with the screw that you removed earlier. Tighten the screw to 5.0 inch-pounds (5.8 kg cm) of torque. 16.8 Reassembling the EXB-8500 To reassemble the EXB-8500, replace these parts in the following order: Faceplate Chapter 6 Door...

  • Page 101: Adjusting The Head Sync Timing

    Microcode level 85C-0050 or higher To determine the levels of the boot PROM code and microcode, see the label on the top of the EXB-8500. If you do not have code at the required levels, you can order a free upgrade from EXABYTE.

  • Page 102: Using The Head Sync Tape

    1. Apply power to the EXB-8500 and wait for it to complete its power-on self-test. 2. Press the unload button on the EXB-8500 and wait for the door to open. 3. Insert the head sync tape in the EXB-8500 and close the door.

  • Page 103: Adjusting The Servo Read Amplitude

    This procedure cannot be performed correctly on EXB-8500s with main housings of any other color. Adjusting the servo read amplitude for the EXB-8500 involves the following steps: Connecting the EXB-8500 whose amplitude needs adjusting to an oscilloscope.

  • Page 104: Figure 18-1 Location Of Test Points On Krw Card

    18 Adjusting the Servo Read Amplitude 18.2 Preparing the EXB-8500 To prepare the EXB-8500 for adjusting the servo read amplitude, follow these steps: 1. Connect the EXB-8500 whose amplitude needs adjusting to the power source and to the SCSI bus of your personal computer.

  • Page 105: Figure 18-2 Location Of Ground Points On The Krw Card

    Figure 18-2 shows the locations of the ground points. You are now ready to adjust the servo read amplitude for both EXB-8200 and EXB-8500 formats. Figure 18-2 Location of Ground Points on the KRW Card...

  • Page 106: Adjusting The Servo Read Amplitude For Exb-8200 Format

    2. Using the EXPERT Short test in EXB-8200 format, write a 50-MByte file to tape. 3. Once the write operation is complete, rewind the data cartridge. 4. After you have set up the EXB-8500 and oscilloscope as described in Section 18.2, set the oscilloscope to the following: Volts/division = 200 millivolts Time/division = 2 milliseconds 5.

  • Page 107: Figure 18-3 Oscilloscope Reading For Exb-8200 Format Servo Read Amplitude

    2. Using the EXPERT Short test in EXB-8500 format, write a 50-MByte file to tape. 3. Once the write operation is complete, rewind the data cartridge. 4. After you have set up the EXB-8500 and oscilloscope as described in Section 18.2, set the oscilloscope to the following: Volts/division = 200 millivolts Time/division = 2 milliseconds B delay to the falling edge of head sync = 100 µsec.

  • Page 108: Figure 18-4 Oscilloscope Reading With No Delay

    5. Locate the potentiometer labeled R37 at the top of the KRW card near the right edge. 6. While reading the 50-MByte, EXB-8500 format file using the EXPERT Short test, use the potentiometer adjustment tool to adjust the R37 potentiometer so that the amplitude for the servo zones displayed on the oscilloscope is 800 millivolts ±50 millivolts.

  • Page 109: Figure 18-5 Oscilloscope Reading For Exb-8500 Format Servo Read Amplitude

    18 Adjusting the Servo Read Amplitude Figure 18-5 Oscilloscope Reading for EXB-8500 Format Servo Read Amplitude 4. Once the amplitude is adjusted, disconnect the oscilloscope from the KRW card and eject the data cartridge. October 1991 18-7...
  • Page 110 18 Adjusting the Servo Read Amplitude Notes: 510204 18-8...

  • Page 111: Replacing The Boot Prom

    2. Unload the data cartridge by pressing the unload button or issuing a LOAD/UNLOAD (1Bh) command to the EXB-8500. 3. Disconnect the power cord from the EXB-8500. 4. Disconnect the SCSI cable from the EXB-8500. 5. Move the EXB-8500 to the maintenance area.

  • Page 112: Preparing The Exb-8500

    Chapter 9 Note: You do not need to remove the KRW card, which is the card closest to the front of the EXB-8500. IMPORTANT When removing or inserting a card, hold the card on the edges. To avoid damaging the card, do not hold the components or connectors mounted on the card.

  • Page 113: Figure 19-1 Location Of Boot Prom On The Sys Card

    19 Replacing the Boot PROM 19.3 Removing and Replacing the Boot PROM After removing the edge-mounted cards, you can replace the boot PROM. The boot PROM is the socket-mounted chip in the right rear corner of the SYS card (or motherboard). Removing the Existing Boot PROM To remove the existing boot PROM, follow these steps: 1.

  • Page 114: Figure 19-2 Location Of Notch In Boot Prom

    19 Replacing the Boot PROM Installing a New Boot PROM To install the new boot PROM, follow these steps: 1. Locate the notch on the corner of the PROM as shown in Figure 19-2. Figure 19-2 Location of Notch in Boot PROM 2.

  • Page 115: Reassembling The Exb-8500

    If the pins are badly bent or broken, do not use the PROM. Begin the procedure with a new PROM. 19.4 Reassembling the EXB-8500 To reassemble the EXB-8500, replace these parts in the following order: SIF or DIF card Chapter 9...
  • Page 116 19 Replacing the Boot PROM Notes: 19-6 510204...
  • Page 117 Glossary Glossary µm Micrometer (0.00003937 inches). µs or µsec Microsecond. A unique identifier assigned to each device or address subsystem on the SCSI bus. Also referred to as the SCSI ID. Initiator or target devices connected to the SCSI bus. bus devices Eight bits or one character.
  • Page 118 Glossary The EXB-8500 8mm Cartridge Tape Subsystem. EXB-8500 The EXB-8500 can store up to 5.0 gigabytes of data on a single 8mm data cartridge. Federal Communications Commission. The portion of the front of the EXB 8500 that frames faceplate the door.
  • Page 119 EXB 8500. See also DIF card. The main printed circuit card, or motherboard, at the SYS card bottom of the EXB-8500. This card controls servo operations as well as the operations of the other printed circuit cards in the EXB 8500.
  • Page 120 Glossary Notes: 510204...
  • Page 121 2-1 – 2-8 cleaning 14-3 – 14-4 list of FRUs for removing tapes from 16-1 – 16-10 agency certification of EXB-8500 testing amplitude tools for maintaining See servo read amplitude EXPERT automatic head sync tape, using 17-1 – 17-2...
  • Page 122 PROM (boot PROM), replacing 19-1 – 19-6 R-packs, replacing 3-3 – 3-6 read amplitude See servo read amplitude safety standards met by EXB-8500 servo read amplitude adjusting 18-1 – 18-8 tools required to adjust 18-1 SIF card, replacing 9-1 –...

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