Cpu Board Removal And Replacement - HP 400 Series Servicing Manual

5.3.7 CPU Board Removal and Replacement (Model 400t and 400dl)
Perform the following steps to remove the CPU board:
1. Disconnect all external cables to the system and remove the top cover.
2. Remove the graphics controller board and the memory boards from the system
3. If present, remove the network interface board from the system unit.
4. Disconnect all internal cables connected to the CPU board (see Figure 5-10 for
5-12 FRU Removal and Replacement
unit.
the locations of the cable connectors). If the system has two disk drives, re-
move one drive so that you can easily disconnect the disk drive data cables
from the CPU board.
NOTICE: When you disconnect the graphics cable from the
CPU board, note the connector from which you
disconnect the cable (SGC or DIO-II) so that you
reconnect the graphics cable to the correct connec-
tor.