AT&T 3B2 Maintenance Reference Manual page 181

Version 3
To remove the power supply, execute the following steps:
1. Remove the leads from the power switch and the LEDs and place them out of the
way.
2. Remove the cables from the disk bridge controller. The bridge controller is
attached to a removable chassis that is latched onto the top of the power supply.
Remove this chassis by lifting up on the locking tab that protrudes from the rear,
and sliding the chassis backward (toward the fans). Place the chassis out of the
way.
3. Remove the four header connectors from the power supply and disconnect the two
+5 V harnesses. The power supply is held inside a cage that is secured to the
bottom of the cabinet, and to the peripheral cage. Remove the two screws and the
bracket holding the peripheral cage to the power supply cage.
4. Insert a screwdriver through the round hole in the bottom of the front face of the
cabinet (underneath the power supply). Apply downward pressure on the
screwdriver to lift the locking tab that holds the power supply cage in place.
When the tab is released, the cage will slide backward toward the fans.
Lift
the
cage out and remove the supply from the cage. See Figure 6-19 for pinouts on the
power supply.
382 Subassemblies
6-41