IBM RS/6000 44P 270 Service Manual page 276

7. Disconnect the six power cables from the power supply connectors in the following
order (P3, P4, P6, P5, P2, and P1). Ensure that the cables allow clearance for
power supply removal.
P1
P2
P5
8. Remove the power cables from the I/O board connectors (J16 and J19).
9. Remove the retaining screws that secure the power supply to the rear of the
system unit.
258
Service Guide
Power Supply
Front View Side View
P6 P4 P3
Power
Supply
Screws (4)