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8 Contents
Control Panel Assembly (Service-only
Procedure)
. . . . . . . . . . . . . . . . . . . . . . . . 131
Removing the Control Panel Assembly
. . . . . . . 131
Installing the Control Panel Assembly
. . . . . . . 133
System Board (Service-only Procedure)
. . . . . . . . 133
Removing the System Board
. . . . . . . . . . . . 133
Installing the System Board
. . . . . . . . . . . . 136
4 Troubleshooting Your System . . . . . . . . 137
Safety First—For You and Your System . . . . . . . . . 137
Start-Up Routine
. . . . . . . . . . . . . . . . . . . . . 137
Checking the Equipment
. . . . . . . . . . . . . . . . . 138
Troubleshooting IRQ Assignment Conflicts
. . . . 138
Troubleshooting External Connections
. . . . . . . 139
Troubleshooting the Video Subsystem
. . . . . . . 139
Troubleshooting the Keyboard
. . . . . . . . . . . 140
Troubleshooting the Mouse
. . . . . . . . . . . . 141
Troubleshooting Basic I/O Functions
. . . . . . . . . . 141
Troubleshooting a Serial I/O Device
. . . . . . . . 142
Troubleshooting a USB Device
. . . . . . . . . . . 143
Troubleshooting a NIC
. . . . . . . . . . . . . . . . . . 143
Troubleshooting a Wet System
. . . . . . . . . . . . . 144
Troubleshooting a Damaged System
. . . . . . . . . . 146
Troubleshooting the System Battery
. . . . . . . . . . 147
Troubleshooting Power Supplies
. . . . . . . . . . . . 147