RA81 Disk Drive Maintenance Guide

Company:Digital Equipment Corporation
Part:AA-M879B-TC
Date:1983
Keywords:

Table of Contents

  • 1 Introduction
    • 1.1 Scope
    • 1.2 Related Documentation
  • 2 Removal and Replacement
    • 2.1 FRU Locations
  • 3 Adjustments
    • 3.1 Introduction
    • 3.2 Belt Tension Adjustment
  • 4 Drive-Resident Diagnostics
    • 4.1 Introduction
    • 4.2 Diagnostic Terminal Connection and Setup
    • 4.3 Diagnostic Commands
    • 4.4 Diagnostic Utility Commands
      • 4.4.1 Diagnostic Loop Mode
    • 4.5 Diagnostic Error Reports
    • 4.6 Exiting Diagnostic Monitor Mode
  • 5 Fault Isolation
    • 5.1 Introduction
    • 5.2 Subsystem Error Message Interpretation
      • 5.2.1 Error Message Status Line Interpretation
      • 5.2.2 Real-Time Drive State (RTDS) Interpretation
    • 5.3 Troubleshooting Procedures and Tips
      • 5.3.1 Basic Drive Troubleshooting
      • 5.3.2 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 HDA Shipment Procedure
      • 5.3.9 Write-Protect Function Test
      • 5.3.10 Spindle Motor Thermal Time-outs
      • 5.3.11 Changing a Drive Unit Number
      • 5.3.12 RA81 Signal Diagram
    • 5.4 RA81 Drive Check-out Procedures
  • Appendix A Hexadecimal Number Conversions
  • Appendix B Diagnostic Sequence Lists
  • Appendix C Subsystem Run Diagnostics
  • Appendix D Run Diag Test List
  • 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

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