Product Info

1X UBS Macro B T S FRU 220 V AC P ower Supply Module (PSM) Shelf

Procedure 10 -3 R emo ving the failed 220 V AC PSM shelf (Continued)

PSM weighs appro ximately 5 kg. Be careful when handling the PSM to prev ent

damage to the equipment and personal injury .

Remove all the PSMs from the slots of the 220 V AC PSM shelf .

Grasp the handle on the front panel of the PSM with one hand. Slowly pull the

PSM out of the shelf slot while carefully supporting the bottom of the module with the

other hand.

Remove the ﬁller panels (if used) from the slots of the 220 V AC PSM shelf . Using a T25

TORX bit and driver , loosen the captive retaining thumbscrew on the ﬁller panel until it is

disengaged from the shelf .

Y ou will be disconnecting multiple cables/wires from connectors. If necessary ,

use masking tape and a marker and temporarily tag each cable as to the proper

connector before disconnection.

Disconnect the +27 V DC output power cable on the rear of the PSM shelf from the +27 V

DC input power cable on the rear of the PDU by separating the orange connectors.

Disconnect the back -up battery cable (if used) from the +27 V DC output power connector

on the rear of the 220 V AC PSM shelf by separating the orange connectors.

Using a TORX T20 bit and driver , remove the 4 screws securing the terminal block cover box

to the 220 V AC PSM shelf . Remove the terminal block cover box from the PSM shelf .

The terminal block cover box may have conduit attached to it. It may be necessary

to free the conduit so that the box can be moved out of the way .

Using a ﬂat blade screwdriver , turn the ground terminal

screw counter clockwise (CCW) to open the terminal.

Disconnect the ground wire from the terminal.

Using a ﬂat blade screwdriver , turn each AC supply line wire

terminal screw counter clockwise (CCW) to open the terminals.

Disconnect the AC supply line wires from the terminals.

1 1

Disconnect all of the cables connected to the 220 V AC PSM shelf front panel connectors.

Using TORX T25 driver , loosen the two rack mounting screws in the keyhole slots of the

220 V AC PSM shelf rack mounting ﬂanges. Do not remove these two screws. Leave the

screw heads extending 8 mm out from the rack surface. These two screws will serve as

hanger screws.

Continued

68P09283A64 -3 10 -13

FOA SEP 2007