Dell ChengMing 3990 Service Manual page 4

Expansion card................................................................................................................................................................... 37
Removing the expansion card...................................................................................................................................37
Installing the expansion card.................................................................................................................................... 39
WLAN module.................................................................................................................................................................... 40
Removing the WLAN module....................................................................................................................................40
Installing the WLAN module.......................................................................................................................................41
Coin-cell battery................................................................................................................................................................ 42
Removing the coin cell battery................................................................................................................................ 42
Installing the coin cell battery...................................................................................................................................43
Processor............................................................................................................................................................................ 43
Removing the processor............................................................................................................................................43
Installing the processor.............................................................................................................................................. 45
System board..................................................................................................................................................................... 46
Removing the system board..................................................................................................................................... 46
Installing the system board....................................................................................................................................... 48
Chapter 4: Troubleshooting......................................................................................................... 51
EC Diag LED Behavior ..................................................................................................................................................... 51
Dell Enhanced Pre-Boot System Assessment - ePSA Diagnostic 3.0...............................................................53
System error messages................................................................................................................................................... 53
Recovering the operating system................................................................................................................................. 53
Real-Time Clock (RTC Reset)........................................................................................................................................54
Backup media and recovery options.............................................................................................................................54
Wi-Fi power cycle..............................................................................................................................................................54
Chapter 5: Getting help and contacting Dell................................................................................ 55
4 Contents