RA81 Disk Drive Service Manual

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

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

Address:	http://bitsavers.org/pdf/dec/disc/ra81/EK-0RA81-SV-001_Svc_Oct82.pdf
Site:	Al Kossow's Bitsavers
Format:	PDF
Size:	5273055 bytes (5.0 MiB)

Address:	http://www.vaxhaven.com/images/6/63/EK-0RA81-SV-001.pdf
Site:	VaxHaven
Format:	PDF
Size:	4277274 bytes (4.1 MiB)

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RA81 Disk Drive Service Manual

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