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PREFACE
The COMPAQ DESKPRO 386 PERSONAL COMPUTER MAINTENANCE
AND SERVICE GUIDE is a troubleshooting, maintenance, and repair guide
that can be used as a reference when servicing the COMPAQ DESKPRO 386
Personal Computer.
All troubleshooting and repair procedures are detailed to allow subassem-
bly/module-level repair only.
CAUTION
Because of the complexity of the individual boards and subassemblies,
Compaq Computer Corporation strongly recommends that you do not
attempt to make field repairs at the component level.
- COMPAQ DESKPRO 386 1
- Personal Computer 1
- MAINTENANCE AND 1
- SERVICE GUIDE 1
- Compaq Computer Corporation 3
- SUMMARY OF TEXT 7
- REQUIRED TOOLS AND SUPPLIES 9
- ADDITIONAL INFORMATION 10
- CONTENTS 11
- Chapter 6 13
- ILLUSTRATED PARTS CATALOG 13
- Chapter 7 13
- Chapter 8 14
- Chapter 9 15
- MASS STORAGE CONFIGURATIONS 15
- Appendix A 15
- INDEX A-1 15
- Chapter 1 27
- OPERATING AND 27
- PERFORMANCE 27
- SPECIFICATIONS 27
- Performance Specifications 28
- 1.3 COMPAQ ENHANCED 29
- KEYBOARD 29
- 1.4 84-KEY KEYBOARD 29
- 1.5 COMPAQ DUAL-MODE MONITOR 30
- 1.6 COMPAQ COLOR MONITOR 31
- FOR THE EXPANSION UNIT 45
- Chapter 2 49
- POWER-ON SELF-TEST 49
- (POST)/PROBLEM ISOLATION 49
- 2.3 PRELIMINARY STEPS TO 50
- PROBLEM ISOLATION 50
- 2.4 PROBLEM ISOLATION 50
- FLOWCHART 50
- (Post)/Problem Isolation 52
- Chapter 3 59
- SETUP PROGRAM 59
- 3.2 HOW TO RUN SETUP 60
- Chapter 4 65
- ADVANCED DIAGNOSTICS 65
- 4.2 MAIN MENU 66
- Format a Diskette 67
- Run the SETUP Program 67
- SETUP Program 67
- Display ROM Versions 67
- 4.3 ADVANCED DIAGNOSTICS 68
- 4.4 TEST SELECTION MENU 69
- Keyboard 70
- Parallel Interface 70
- Video Controller 72
- Display Characteristics 72
- Character Set 72
- 80 x 25 Display 72
- 40 x 25 Display 73
- 320 x 200 Standard Graphics 74
- 640 x 200 Standard Graphics 74
- Lightpen 75
- Display Memory Pages 75
- Gray Scale/Color 76
- 640 x 200 Color Graphics 77
- 640 x 350 Color Graphics 78
- Monochrome Text 79
- 640 x 350 Monochrome Graphics 79
- 640 x 480 Graphics 80
- 256 Color Mode 80
- Diskette Drive 81
- Monochrome Video Board 82
- Asynchronous Communications 82
- Interface 82
- Modem Internal Loopback 83
- Auto Originate Mode 83
- Auto Answer Mode 83
- Modem External Termination 83
- Fixed Disk Drive 84
- Head Select 85
- Run All the Above Tests 85
- Read Verify 85
- Format Menu 85
- Surface Analysis 87
- Change Interleave 87
- Display Current Interleave 87
- (for diagnostic use only) 88
- Enhanced Color Graphics 89
- Video Graphics Controller 89
- 5.3 ADVANCED DIAGNOSTICS 96
- ERROR CODES 96
- Manual No. 108033-003 100
- 5.4 MEMORY ERROR CODES 123
- 127
- 5.5 EXTDISK MESSAGES 128
- Table 5-5. EXTDISK Messages 129
- ILLUSTRATED PARTS 133
- 6.2 SPARE PARTS LIST, U.S 134
- 6.4 PARTS LIST 142
- [ page missing ] 149
- 6.5 300-/600-MEGABYTE FIXED 153
- DISK DRIVE EXPANSION UNIT 153
- PARTS LIST 153
- REMOVAL AND 159
- REPLACEMENT 159
- PROCEDURES 159
- (Installed) 161
- 5. Set the monitor aside 162
- 7.3 KEYBOARD 163
- 7.4 POWER FUSE 164
- 7.5 PREPARING THE 166
- SYSTEM UNIT FOR THE 166
- INTERNAL REMOVAL AND 166
- REPLACEMENT PROCEDURES 166
- 7.6 SYSTEM UNIT COVER AND 167
- INTERNAL CONFIGURATION 167
- 7.7 POWER SUPPLY 170
- 7.8 BATTERY 173
- 7.9 SECURITY LOCK 176
- 7.10 EXPANSION BOARD(S) 177
- Board Signal Cables 180
- 7.11 80287 COPROCESSOR 181
- 7.12 MEMORY EXPANSION 182
- BOARD(S) 182
- 7.13 MEMORY CHIP(S) 184
- 7.14 SPEAKER ASSEMBLY AND 187
- SECURITY LOCK SWITCH 187
- (see Figure 7-32) 189
- 7.15 MASS STORAGE DEVICE(S) 191
- Removal and Replacement 192
- IMPORTANT 196
- 7.16 SYSTEM BOARD 197
- 7.17 INTEL 387 COPROCESSOR 203
- 7.18 LOST KEY 207
- 7.19 300-/600-MEGABYTE FIXED 208
- Fixed Disk Drive Unit 209
- Terminating Resistor 211
- Power Supply 212
- JUMPER SETTINGS AND 217
- SWITCH SETTINGS 217
- 8.2. SYSTEM BOARDS 218
- 000413) 223
- EXPANSION BOARDS 226
- Bank 3 Enabled 227
- Bank 3 Disabled 227
- (assy. no. WD1005WAH) 229
- (assy. no. WD1002WAH) 235
- 8.9 HOST ADAPTER BOARD 236
- Configuration Switch Bank SW1 240
- Configuration Switch Bank SW2 242
- Configuration Switch Bank SW3 243
- Enhanced Color Graphics Board 243
- 8.11 VIDEO DISPLAY 244
- CONTROLLER BOARDS 244
- (assy. no. 000160) 245
- (assy. no. 000345) 245
- (assy. no. 000525) 246
- PRINTER BOARD 248
- 8.14 300-/600-MEGABYTE 252
- FIXED DISK DRIVE 252
- EXPANSION UNIT 252
- MASS STORAGE 257
- CONFIGURATION 257
- 9.2 SYSTEM CONFIGURATION 258
- Mirroring 260
- Duplexing 261
- 9.3 SETTING UP THE 262
- EXTERNAL FIXED DISK 262
- DRIVE EXPANSION UNIT 262
- Format Command 263
- Novell Netware Configuration 263
- ABEND: Not enough memory 267
- A-2 Appendix A, Index 270
- A-4 Appendix A, Index 272
- A-6 Appendix A, Index 274
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