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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Chapter 1-0Vi~Rview
Scope of Chapter
Concept Mlodules
Electronics Tray
Processor Board
Memory Board
Video Monitor
Power Supply
Concept Options
Operating System Software
Floppy Disk Drive
Winchester Disk Drive Options
Archival and Back-Up Option
Network Option
Chapter 2-Functional Description
Scope of Chapter
Concept Processor Board
Microprocessor
Bus Buffers
Memory Mapper
Roms and Static RAM
Omninet
ROM and Static RAM Sockets
50-Pin I/O Slots
Adlc
Data Communication Ports
Interrupts
Memory Arbitration
Calendar
Bell, Timer, and VIA
Data Acknowledge
Data Acknowledge Timing
Concept Mlemory Board
Oscillator
Horizontal Timing
Vertical Timing
RAM Timing
Memory Selection
Horizontal Timing Circuit
Video Address Counter
Memory Multiplexing
Memory Array
Memory Buffers
Video Shift Registers
Chapter 3-Disassembly
Installation
Visual Inspection
Video Monitor Removal and Disassembly
Concept Rear View
Latch Screws
Keyboard Disassembly and Cleaning
Corvus Dealer Service
Electronics Tray Disassembly and Assembly
Electronics Tray Power Connections
Power Supply Removal
Chapter 4-Adjustments
Scope of Chapter
Concept Power Supply Adjustments
Preparations for Video Adjustments
Video Alignment and Adjustment
CRT Adjustment Yoke
Horizontal and Vertical PCA
Chapter 5-Troubleshooting
Scope of Chapter
Levell Troubleshooting
Video Monitor
CORCOM Setting
Power Supply
Monitor Voltage Test Points
Power-On Self Tests
Self Test Error Codes
Boot Problems
Rev 03 Boot Switch Settings
Rev 04 Boot Switch Setting
Level 2 Troubleshooting
Macsbug Installation Procedures
Rev 03 ROM and RAM Locations
Rev 04 ROM and RAM Locations
Communicating with Macsbug
Operating Procedures
Macsbug Routines
Component Level Troubleshooting
Proc~Ssor Signal Descriptions
Processor Test Points
Memory and Video Controller Test Points
Appendix Aschematics and Assembly Drawings
Assembly Drawings
Appendixb Troubleshooting Flow Chart
Appendix B: Troubleshooting Flow Chart
Appendix C: Test Point Signals
Processor Board Signals
Memory Board Signals
Appendix 0: Timing Charts
Appendix E: Macsbug
Macsbug Commands
Macsbug Routines
Self Test Routines
General Memory and 110 Maps
ROM Mapping of I/O Slots
Omninet
Clock/Calendar/ Altmap/Volume
Data Communication and Keyboard Registers
Appendix F: Maps
Appendix G: Memory Board Jumper Layout
Data Communication Ports Jl and J2
Board Connectors J4, J5, and J6
Additional Connectors
Appendix H: Connector Descriptions
Appendix I: Concept Parts List
Appendixj Specifications
Motorola MC68000
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Table of Contents
Troubleshooting
CHAPTER 5-TROUBLESHOOTING
44
Scope of Chapter
46
Level 2 Troubleshooting
53
MACSbug Routines
56
APPENDIXB TROUBLESHOOTING FLOW CHART
78
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