REPLACE PMC COMMUNICATIONS CABINET 12 VDC POWER SUPPLY

TM 5-6350-275-24&P

3-27. REPLACE PMC COMMUNICATIONS CABINET 12 VDC POWER SUPPLY. (Figure 3-33 and 3-34).

This task consists of:

a. Remove

b. Install

INITIAL SETUP:

Tools:

Equipment Condition:

Screwdriver, Flat tip (Item 6, App B)

PMC cabinet doors open

Screwdriver, Flat tip (Item 7, App B)

Wire Cutters (Item 24, App B)

General Safety Instructions:

Remove all jewelry while working on

Materials/Parts:

equipment.

12 vdc Power Supply 5105-E05

Wear ESD wriststrap while handling electronic

assemblies.

WARNING

When working on high-voltage components, always have an additional person present, and keep one hand

away from equipment to reduce hazard of current flowing through vital organs of body. Remove all

jewelry from fingers, wrists, and neck before working on electrical components. Failure to do so may

result in serious injury or death.

Shut off power source before attempting to disconnect, service, or connect wires or cables. Failure to do

so may result in serious injury or death.

To avoid personal injury, use an adequate number of personnel to lift or move equipment weighing over

50 pounds or oversize equipment. Observe correct lifting techniques. Failure to do so may result in

serious injury or death.

a. Removal

(1) Place power supply A switch (Figure 3-33, 2) and power supply B switch (Figure 3-33, 4) to off.

(2) Open rear door on PMC cabinet #B and remove power supply ac power cord from ac power source.

(3) Remove protective cover (5) by removing four screws (6) holding cover to standoffs (7). (Ref. Fig. 3-34)

(4) Tag and remove wires from power supply input terminal power block. (Item 13)

(5) Tag and remove wires from TB (Item 12) for power supply being replaced.

(6) Remove tie down straps holding input/output wiring to power supply.

(7) Remove four screws (8), washers (9), and nuts (10) holding power supply to front panel assembly (11).

(8) Remove power supply from cabinet #B.

3-101