Service manual

Removal and Replacement 7-49
4. Release the power supply tray by removing the two Phillips head screws on the
side of the drawer.
5. Lift the power supply tray to release it from the sheet metal and slide it out from
the drawer.
6. Tilt the tray to allow easier access to the fans.
7. Remove the bracket holding the power harness as it passes from the power
section to the system card cage section of the drawer. Remove the three Phillips
head screws holding the bracket in place.
8. Disconnect the power harness from the system motherboard and fold the harness
back over the power supplies. Remove any modules that prevent you from
disconnecting the harness from the system motherboard.
CAUTION: Secure the power harness connectors in the system card cage to
ensure that they cannot damage the pins in the CPU connectors.
9. Disconnect the three power connectors from the PCI motherboard and pass them
through the hole from the PCI card cage to the power section of the drawer.
10. Disconnect the fan power cables from the power harness.
11. Remove the four Phillips head screws holding the OCP tray to the system
drawer. Slide the tray out of the system drawer far enough to disconnect power
cables attached to the OCP, the floppy, and the CD-ROM drive.
12. Remove the tray from the system.
13. Release the three lever latches on the bracket holding all three fans in place.
14. Disconnect the broken fan’s power cable from the power harness and lift the fan
from the drawer.
Replacement
Reverse the steps in the Removal procedure.
Verification
Power up the system. If the fan you installed is faulty, the system will not power up.
Look at the PCM LEDs to determine that the fan you replaced is functioning
properly.