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G-2 Troubleshooting Without Diagnostics
Power Problems
This section identifies some quick checks for power–related problems.
Table G-1
Solutions for Power Problems
Problem Possible Solution
Computer will not turn on. Ensure that the computer is connected to a power source.
Cables to the external power source are unplugged. Ensure that cables
connecting the computer and the external source are plugged in properly.
A PCI or ISA card that has been installed is defective. Remove any adapter
card that was just installed.
Computer does not automatically display the date
and time.
The real-time clock (RTC) battery may need to be replaced. See Chapters 5
and 6 for replacement procedures.
Thermal Problems
This section identifies a thermal problem that could be related to the processor overheating.
Table G-2
Solutions for Thermal Problems
Problem Possible Solution
Computer screen frozen, the power supply fan
continues to run, and the power LED is illuminated.
1. Turn off the computer and let everything cool down.
2. Check to ensure that the air duct is installed and the processor is under
the flap (Pentium II minitower system only).
3. Check for 3 inches of clearance at the front and back of the computer.
4. Resume operation.
5. If lock-up continues, run diagnostics for total system.
6. Look for software or interrupt conflicts.
7. Replace the processor, if necessary. See Chapters 5 and 6 for
replacement procedures.
- MAINTENANCE 1
- & SERVICE GUIDE 1
- 278041-001 2
- 278785-002 2
- Maintenance and Service Guide 3
- About this Guide 5
- Product Description 5
- Compaq Utilities 6
- Contents v 7
- Jumper and Switch Information 9
- Specifications 9
- Symbols and Conventions 11
- Technician Notes 12
- System Serial Number 12
- Figure 1-1 13
- Personal Computer Models 14
- 1.2 Features 15
- 1.2.1 Pentium System Feature 15
- 1-4 Product Description 16
- 1.3 System Design 17
- 1.3.1 Design Overview 17
- 1.3.2 System Board 18
- 1.3.3 Processor 18
- 1.3.4 System Memory 18
- 1.3.5 Cache Memory 18
- 1.3.6 Graphics Controllers 19
- 1.3.7 Chipsets 19
- VIA Chipset 19
- 440LX Chipset 19
- 1.3.8 System I/O 20
- 1.3.9 System BIOS 20
- PCI Auto-Configuration 20
- IDE/EIDE Auto-Configuration 20
- ISA Plug and Play Capability 20
- 1.3.10 Expansion Slots 21
- 1.3.11 Power Supply 21
- 1.3.13 Serial Port 21
- 1.3.14 Parallel Port 21
- Preloaded Software 22
- System Drivers 23
- Asset Management 24
- Configuration Management 24
- Integration Management 25
- Fault Management 25
- Security Management 25
- Table 1-3 26
- Lights and Controls 26
- 1.4.2 Drive Positions 27
- Figure 1-3 27
- Table 1-4 27
- 1.4.3 Rear Panel Connectors 28
- Figure 1-4 28
- Rear Panel Connectors 28
- Table 1-5 28
- Table 1-6 29
- 1.5.2 Drive Positions 30
- Figure 1-6 30
- Table 1-7 31
- 1.5.3 Rear Panel Connectors 32
- Figure 1-7 32
- Table 1-8 33
- 1.6 Enhanced Keyboard 34
- Figure 1-8 34
- Enhanced Keyboard 34
- Table 1-9 35
- 1.7 Options 36
- 1.7.5 Monitor Options 37
- 1.7.8 PD-CD Drive 38
- 1.7.9 Modems 38
- 2.1 Getting Ready 39
- 2.1.1 Preparing the Computer 39
- 2-2 Compaq Utilities 40
- 2.2 Computer Setup 41
- Table 2-1 42
- Built-In Devices 42
- Quick Boot 42
- 2.2.1 Security Features 43
- Entering a Power-On Password 44
- Changing a Power-On Password 44
- Deleting a Power-On Password 45
- Table 2-5 45
- Clearing the Password 46
- Figure 2-1 46
- Figure 2-2 46
- 2.2.2 QuickLock/QuickBlank 47
- 2.3 Computer Checkup (TEST) 48
- 2.10 ROMPaq 52
- 2.11.1 Asset Management 53
- 2.11.2 Fault Management 54
- Monitor Fault Diagnosis 54
- Proactive Backup 55
- Surge-Tolerant Power Supply 55
- 2.11.3 Security Management 55
- Remote ROM Flash 56
- Upgrading Flash ROM 57
- Using Remote ROM Flash 57
- FailSafe Boot Block ROM 58
- Table 2-6 59
- Keyboard Light Combinations 59
- Figure 2-3 59
- Keyboard Lights 59
- Remote Security Management 60
- Replicated Setup 60
- Using Replicated Setup 60
- Power Management 60
- Compaq Integrated Software 61
- Universal Driver Manager 61
- 2.11.5 Integration Management 62
- Desktop Management Interface 62
- 2-26 Compaq Utilities 64
- 2.13 Prefailure Warranty 65
- Figure 3-1 66
- 3.1 System Unit 67
- Figure 3-2 67
- System Unit, Desktop 67
- Table 3-1 68
- Figure 3-3 69
- System Unit, Minitower 69
- Table 3-2 70
- 3.2 Mass Storage Devices 71
- Figure 3-4 71
- Mass Storage Devices 71
- Table 3-3 72
- 3.3 Cables 73
- Figure 3-5 73
- Table 3-4 74
- Figure 3-6 75
- Optional Boards 75
- Table 3-5 76
- Standard and Optional Boards 76
- Figure 3-7 77
- System and Riser Boards 77
- 3.5 Keyboards 79
- Table 3-6 80
- 3.6 Monitors 81
- Figure 3-9 81
- Monitors 81
- Table 3-7 82
- Figure 3-10 84
- Miscellaneous Hardware Kit 84
- Table 3-8 84
- Figure 3-11 85
- Table 3-9 85
- Figure 3-12 86
- Table 3-10 86
- 3.9 Miscellaneous Parts 87
- Figure 3-13 87
- Table 3-11 87
- Figure 3-14 88
- Miscellaneous Parts 88
- Table 3-12 88
- 3.10 Shipping Boxes 89
- 3.11 Documentation 90
- Table 3-15 90
- Documentation 90
- 3.12 Software 91
- Table 3-16 91
- Software 91
- EMOVAL AND 94
- EPLACEMENT 94
- RELIMINARIES 94
- Table 4-2 95
- 4.1.4 Grounding Workstations 96
- 4.2 Routine Care 97
- Precautions 97
- 4.2.3 Cleaning the Keyboard 98
- 4.2.4 Cleaning the Monitor 98
- 4.2.5 Cleaning the Mouse 98
- 4.3 Service Considerations 99
- 4.3.2 Screws 99
- 4.3.3 Cables and Connectors 99
- 4.3.4 Hard Drives 100
- 4.3.5 Plastic Parts 100
- 4.3.6 Lithium Battery 100
- 5.1 Serial Number 101
- Figure 5-1 101
- Serial Number Location 101
- CAUTION: 103
- 5.4 Feet 104
- Figure 5-2 104
- Installing the Feet 104
- 5.5 Cable Lock 105
- Figure 5-3 105
- Installing the Cable Lock 105
- 5.6 System Unit Cover 106
- Figure 5-4 106
- 5.7 Speaker 107
- Figure 5-5 107
- Figure 5-6 108
- Removing the Speaker 108
- 5.8 Expansion Board 109
- Figure 5-7 109
- Figure 5-8 110
- Figure 5-9 111
- 5.9 System Board Components 112
- Module Upgrade 113
- 5.9.3 Microprocessor 114
- Pentium II System Board 116
- Figure 5-14 116
- 5.9.4 Cache Memory (Pentium 117
- System Only) 117
- 5.10 Riser Board 118
- Figure 5-16 118
- Removing the Riser Board 118
- 5.11 Riser Brace 119
- Figure 5-17 119
- Removing the Riser Brace 119
- 5.12 Expansion Board Guide 120
- Figure 5-18 120
- 5.13 Replacement Battery 121
- Figure 5-19 121
- Figure 5-20 122
- 5.14 Front Bezel Assembly 123
- 5.14.1 Front Bezel 123
- Figure 5-21 123
- Removing the Front Bezel 123
- 5.14.2 Power Button 124
- Figure 5-22 124
- Removing the Power Button 124
- 5.14.3 Bezel Blank 125
- Figure 5-23 125
- Removing the Bezel Blank 125
- 5.14.4 Compaq Logo 126
- Figure 5-24 126
- Replacing the Compaq Logo 126
- 5.15 Power Supply Assembly 127
- 5.15.1 Power Switch Assembly 127
- Figure 5-25 127
- Removing the Power Switch 127
- Figure 5-26 128
- 5.15.2 Power Supply 129
- Figure 5-27 129
- Removing the Power Supply 129
- 5.16 Mass Storage Devices 130
- Figure 5-29 131
- Removing a 3.5-Inch Drive 131
- 5.16.2 5.25-Inch Drive Bays 132
- Figure 5-31 133
- Removing the CD-ROM Drive 133
- Figure 5-32 134
- Locating the Mounting Screws 134
- Figure 5-33 135
- Figure 5-34 135
- Figure 5-35 136
- 5.17 Drive Cage 137
- Figure 5-36 137
- Removing the Drive Cage 137
- 5.18 LED Cable 138
- Figure 5-37 138
- Figure 5-38 139
- 5.19 System Board 140
- Figure 5-39 141
- Figure 5-40 142
- 6.1 Serial Number 143
- Figure 6-1 143
- 6.4 Feet 145
- Figure 6-2 145
- 6.5 Cable Lock 146
- Figure 6-3 146
- 6.6 Exposing the Chassis 147
- 6.6.1 Access Panel 147
- Figure 6-4 147
- Removing the Access Panel 147
- 6.6.2 Minitower J Hood 148
- Figure 6-5 148
- Removing the J Hood 148
- 6.7 Riser Brace 149
- Figure 6-6 149
- 6.8 Expansion Board 150
- Figure 6-7 150
- Figure 6-8 151
- Removing an Expansion Board 151
- Figure 6-9 151
- 6.9 Expansion Board Guide 152
- Figure 6-10 152
- 6.10 Riser Board 153
- Figure 6-11 153
- 6.11 Speaker 154
- Figure 6-12 154
- 6.12 System Board Components 155
- 6.12.2 Microprocessor 156
- Figure 6-15 158
- Figure 6-16 159
- 6.13 System Board 161
- Figure 6-19 161
- Figure 6-20 162
- 6.14 Replacement Battery 164
- Figure 6-22 164
- Figure 6-23 165
- Figure 6-24 166
- 6.16 Front Bezel Assembly 167
- 6.16.1 Front Bezel 167
- Figure 6-25 167
- 6.16.2 Power Button 168
- Figure 6-26 168
- 6.16.3 Bezel Blank 169
- Figure 6-27 169
- Removing the Bezel Blank 169
- 6.16.4 Compaq Logo 170
- Figure 6-28 170
- Replacing the Compaq Logo 170
- 6.17 Power Supply Assembly 171
- Figure 6-29 171
- Figure 6-30 172
- 6.17.2 Power Supply 173
- Figure 6-31 173
- 6.18 LED Cable 174
- Figure 6-32 174
- Figure 6-33 175
- 6.19 Mass Storage Devices 176
- Figure 6-35 177
- 6.19.2 5.25-Inch Drive Bays 178
- Figure 6-37 179
- Removing the CD-ROM Drive 179
- Figure 6-38 180
- Figure 6-39 181
- Figure 6-40 181
- Figure 6-41 182
- UMPER AND 184
- NFORMATION 184
- 7.1 System Board Switches 185
- Figure 7-1 185
- Table 7-1 186
- Figure 7-2 187
- Table 7-2 187
- 7.1.2 Switch Settings 188
- Figure 7-3 188
- Table 7-3 188
- 7.2 System Board Jumpers 189
- Figure 7-5 190
- Figure 7-6 190
- 7.2.2 Clearing Configuration 191
- Figure 7-7 191
- Figure 7-8 191
- Figure 7-9 192
- Figure 7-10 192
- 7.3 Hard Drives 193
- Figure 7-13 194
- Table 7-7 194
- Jumper Settings 194
- Table 7-8 195
- Table 7-9 195
- Figure 7-16 196
- Table 7-10 196
- Figure 7-18 198
- Table 7-12 198
- Figure 7-21 200
- Table 7-15 200
- 7.5 Optional PD-CD Drives 201
- 7.6 Diskette Drive 202
- 8.1 System 203
- Table 8-1 203
- Desktop System Specifications 203
- Table 8-2 204
- Table 8-3 205
- System Interrupts 205
- Table 8-4 205
- System DMA 205
- Table 8-5 206
- System I/O 206
- Continued 206
- Table 8-6 208
- System Memory Map 208
- 8.2 Drives 209
- Table 8-7 209
- 1.44 MB Diskette Drive 209
- Table 8-8 210
- Hard Drives 210
- Table 8-9 211
- Ultra SCSI Hard Drives 211
- Table 8-10 212
- CD-ROM Drives 212
- Table 8-11 213
- PD-CD Drive 213
- Continued 214
- Table 8-12 215
- LS-120 Drive 215
- 8.3 Audio System 216
- 8.4 Keyboard 216
- 8.5 Mouse 217
- 8-16 Specifications 218
- ONNECTOR 219
- SSIGNMENTS 219
- Table A-3 220
- Parallel Interface 220
- Table A-4 220
- Serial Interfaces 220
- Connector Pin Signal 221
- Connector and Icon Pin Signal 221
- Table A-8 222
- Ultra-Wide SCSI Connector 222
- Table A-14 224
- IDE/EIDE Drive Cable 224
- General Requirements 225
- Country-Specific Requirements 226
- Cable Select 227
- Automatic Soft-Drive Types 228
- Table C-1 228
- Soft-Drive Type Assignments 228
- Table C-2 229
- IDE Cable Transfer Rates 229
- Guidelines for Installing 230
- Optional SCSI Devices 230
- Termination 231
- Table E-1 232
- Summary of Test Error Codes 232
- Table E-2 233
- Table E-3 234
- Memory Test Error Codes 234
- Table E-4 234
- Keyboard Test Error Codes 234
- E-4 Diagnostic Error Codes 235
- Table E-9 236
- Hard Drive Test Error Codes 236
- Table E-10 236
- Tape Drive Test Error Codes 236
- Table E-11 237
- Video Test Error Codes 237
- Table E-12 238
- Audio Test Error Codes 238
- Table E-13 238
- Table E-14 239
- SCSI CD-ROM Test Error Codes 239
- Table E-15 239
- SCSI Error Codes 240
- Table E-16 240
- SCSI Device Names 240
- Table E-17 240
- SCSI Test Names 240
- Table E-18 241
- SCSI Test Error Codes 241
- Table F-1 243
- Power-On Self-Test Messages 243
- Checklist for Solving Minor 246
- Problems 246
- Power Problems 247
- Diskette Drive Problems 248
- Table G-3 248
- Display Problems 249
- Table G-4 249
- Printer Problems 250
- Table G-5 250
- Hard Drive Problems 251
- Table G-6 251
- Table G-7 252
- CD-ROM Drive Problems 253
- Table G-8 253
- Memory Problems 254
- SCSI Problems 254
- Network Problems 255
- Table G-11 255
- Resolving Audio 257
- Hardware Conflicts 257
- Table G-12 257
- Audio Interface Settings 257
- IMITATIONS 258
- Table H-1 259
- SDRAM Memory Technologies 259
- Table H-2 260
- Index I-1 261
- I-2 Index 262
- Index I-3 263
- I-4 Index 264
- Index I-5 265
- I-6 Index 266
- Index I-7 267
- I-8 Index 268
- Index I-9 269
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