IBM 6643 - Manual (Page 34)

Fan removal
To remove the rear bucket housing-fan do the following:
1. Remove the rear bucket housing, see “Rear bucket housing (rear cover)
removal” on page 21.
2. Remove the rear EMC cover assembly, see “Rear EMC cover assembly
removal” on page 23.
3. Remove the fan assembly (four screws) from the EMC cover assembly.
Power supply removal
Note:
Make sure the power supply voltage switch is set to the proper operating voltage; 115V or
230V.
26 Hardware Maintenance Manual