RA81 Disk Drive Service Manual

Company:Digital Equipment Corporation
Part:EK-0RA81-SV-001
Date:1982-10
Keywords:

Table of Contents

  • Chapter 1 General Information
    • 1.1 Introduction
    • 1.2 RA81 Disk Drive Description
    • 1.3 RA81 Maintenance Features
    • 1.4 RA81 Maintenance Philosophy
    • 1.5 RA81 Related Documentation
  • Chapter 2 Removal and Replacment Procedures
    • 2.1 Introduction
    • 2.2 Removing Power from the Disk Drive
    • 2.3 Removing the Back Cabinet Door and End Panels
    • 2.4 Replacing the Control Panel Lights and Switch Covers
    • 2.5 Replacing the Air Filter
    • 2.6 Extending and Retracting the Drive on Slides
    • 2.7 Raising the Logic Access Covers
    • 2.8 Removing the Servo and Personality Modules
    • 2.9 Removing the Microprocessor Module
    • 2.10 Raising the Drive Logic Chassis
    • 2.11 Removing the DC Power Harness Assembly
    • 2.12 Removing the Front Bezel Fans
    • 2.13 Removing the HDA and the Read/Write Module
    • 2.14 Removing the Brush Ground Spring
    • 2.15 Removing the Front Bezel
    • 2.16 Removing the Operator Control Panel and Cable
    • 2.17 Removing the Logic AC Harness
    • 2.18 Removing the Drive Power Supply
    • 2.19 Removing the Power Supply Fans
    • 2.20 Removing the HDA Speed and Temperature Sensors
    • 2.21 Removing the Belt Tension Microswitch
    • 2.22 Replacing the Spindle Belt
    • 2.23 Removing the Motor/Brake Assembly
    • 2.24 Removing the Motor Actuator Assembly
    • 2.25 Removing the Wing Pivot Assembly
  • Chapter 3 Adjustments
    • 3.1 Introduction
    • 3.2 Belt Tension Adjustment
  • Chapter 4 Drive-Resident Diagnostics
    • 4.1 Introduction
    • 4.2 Functional and Diagnostic Firmware
    • 4.3 The Diagnostic Terminal
    • 4.4 Diagnostic Command Selection
      • 4.4.1 Run Diag
      • 4.4.2 Run Reca
      • 4.4.3 Run Seek
      • 4.4.4 Run Read
      • 4.4.5 Run Serv
      • 4.4.6 Run Inte
      • 4.4.7 Run Alte
      • 4.4.8 Run Rand
      • 4.4.9 Run Incr
      • 4.4.10 Run Diag Test=xx
    • 4.5 Diagnostic Monitor Utility Commands
      • 4.5.1 Help
      • 4.5.2 Set Diag Loop xxxx
      • 4.5.3 Set Term Speed=xxxx
      • 4.5.4 Show Radi
      • 4.5.5 Show Vers
      • 4.5.6 Show Dcvi
      • 4.5.7 Show Term Speed
      • 4.5.8 Show Diag Loop
      • 4.5.9 Show Diag Faul
      • 4.5.10 Show Diag Stat xxxx
      • 4.5.11 Show Diag Memo xxxx=aaaa
      • 4.5.12 Exit
    • 4.6 Diagnostic Error Reports
    • 4.7 Exiting Diagnostic Monitor Mode
  • Chapter 5 Fault Isolation
    • 5.1 Introduction
    • 5.2 Subsystem Error Message Information
      • 5.2.1 Error Message Status Line Interpretation
      • 5.2.2 Real-Time Drive State Message Interpretation
    • 5.3 Troubleshooting Procedures and Tips
      • 5.3.1 Basic Drive Troubleshooting
      • 5.3.2 Module LED Indicators
      • 5.3.3 Power Supply Troubleshooting
      • 5.3.4 HDA Formatting Procedure
      • 5.3.5 HDA Identification
      • 5.3.6 HDA Fault Isolation
      • 5.3.7 HDA Substitution Procedure
      • 5.3.8 Shipment of HDAs
      • 5.3.9 Write Protect Function Test
      • 5.3.10 Power Failure
      • 5.3.11 Spindle Motor Thermal Timeouts
      • 5.3.12 Changing a Drive Unit Number
      • 5.3.13 RA81 Block Diagram
    • 5.4 RA81 Drive Checkout
  • Appendix A Hexadecimal Number Conversions
  • Appendix B Diagnostic Sequence Lists
  • Appendix C Subsystem Run Diagnostics
  • Appendix D RA81 Diagnostic Test Description
    • D.1 Test 0 (Entire Drive Sequence)
    • D.2 Test 1 (Master ROM Test)
    • D.3 Test 2 (LED Test)
    • D.4 Test 3 (Three-Board Bus Test)
    • D.5 Test 4 (Microprocessor-Only Bus Test)
    • D.6 Test 5 (Personality/Microprocessor Bus Test)
    • D.7 Test 6 (Servo/Microprocessor Bus Test)
    • D.8 Test 7 (Head Select Mux Test)
    • D.9 Test 8 (Sector/Byte Counter Test)
    • D.10 Test 9 (F.E. Front Panel Test)
    • D.11 Test A (Stream Test)
    • D.12 Test B (Master RAM Timer Test)
    • D.13 Test C (Personality Module Logic Test)
    • D.14 Test D (Personality Module Wrap Test)
    • D.15 Test E (R/W Fault Force Test)
    • D.16 Test F (Read Only Test)
    • D.17 Test 10 (Write and Read Test)
    • D.18 Test 11 (Read-Only Cylinder Formatter)
    • D.19 Test 12 (Master Hardcore Sequence Tests)
    • D.20 Test 13 (Master Read/Write Sequence Tests)
    • D.21 Test 14 (Servo Sequence Tests)
    • D.22 Test 15 (Entire Servo Sequence Tests)
    • D.23 Test 16 (Entire Drive Sequence, Spun Up)
    • D.24 Test 17 (Entire Drive Sequence, Spun Down)
    • D.25 Test 18 (Drive Idle Sequence Tests)
    • D.26 Test 19 (Slave ROM Test)
    • D.27 Test 1A (Slave Microprocessor Bus Test)
    • D.28 Test 1B (Servo PLO Test)
    • D.29 Test 1C (Servo Sanity Timer Test)
    • D.30 Test 1D (Servo DAC Test)
    • D.31 Test 1E (Servo Positioner Loop Test)
    • D.32 Test 1F (Servo Velocity Loop Test)
    • D.33 Test 20 (Servo Track Counter Test)
    • D.34 Test 21 (Servo Slow Seek Test)
    • D.35 Test 22 (Guard Band Detect Test)
    • D.36 Test 23 (Incremental Seek, F.E. Mode)
    • D.37 Test 24 (Seek-Seek, F.E. Mode)
    • D.38 Test 25 (Random Seek Test)
    • D.39 Test 26 (Seek-Seek, Default Mode)
    • D.40 Test 27 (Incremental Seek, Default Mode)
    • D.41 Test 28 (Servo Outer Guard Band Seek)
    • D.42 Test 29 (Servo Inner Guard Band Verify)
    • D.43 Test 2A (Servo Recalibration)
  • Appendix E System Fault Codes
  • Appendix F Front Panel Fault Identification
  • Appendix G Error Code Troubleshooting Table
  • Appendix H FRU Part Number List
  • Appendix I Diagnostic Terminal Instructions
    • I.1 Introduction
    • I.2 Shift Keys
    • I.3 Control Characters
    • I.4 Continue and Clear Keys
    • I.5 X-ON, X-OFF Keys
    • I.6 Delete Key
    • I.7 Display Scroll Switch
    • I.8 Break Key
    • I.9 CR Key
    • I.10 Escape Key
    • I.11 Line Feed Key
    • I.12 Space Key
    • I.13 Up and Down Arrow Keys
    • I.14 Top and Bottom Keys

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