Removal and Replacement of Power Supply AI PS2

TM 11-6625-2937-13

Remove tags from wires.

(2) Locate power supply Al PS3 (14) on rear

(4) Reconnect connectors P1 and P2 to J15 and

panel and tag wires connected to its six terminals (nine

J16, respectively, on circuit card assembly rack I A2.

wires).

(5) Secure connectors PI (9) and P2 (10) to J15

(3) Unsolder wires tagged in step (2) from

and J16, respectively, on circuit card assembly rack (11)

power supply AIPS3 terminals and place carefully aside.

by tightening four screw lock assemblies (8).

CAUTION

(6) Replace top and bottom access covers (para

Hold power supply AI P.S3 securely to

5-14b).

prevent damage to adjacent hardware

5-19. Removal and Replacement of Power Supply

while performing steps (4) and (5).

Al PS2 (fig. 5-3)

(4) Remove four nuts (12) and associated

a. Removal. Remove power supply A1PS2 (13, fig.

washers securing power supply A1PS3 to rear panel of

5-3, sheet 2) as follows:

control-interface unit.

WARNING

(5) Remove power supply A1PS3, being careful

Ensure all power is disconnected from equipment.

to clear rear panel.

(1) Remove top and bottom access covers from

b. Replacement. Replace power supply A IPS3 as

control-interface unit (para 5-14a).

Place control-

follows:

interface unit on its left side.

(1) Verify that base of power supply A1PS3 (14) and

(2) Locate power supply A1PS2 (13) on rear

mounting surface on rear panel are completely coated

panel and tag wires connected to its seven terminals (13

with silicone heat sink compound. Apply silicone heat

wires).

sink compound (Dow Corning 340) as required to

(3) Unsolder wires tagged in step (2) from

uncoated areas.

power supply AI PS2 terminals and place carefully aside.

(2) Position replacement power supply A1PS3

CAUTION

on mounting surface on rear panel. Secure in place with

Hold power supply AIPS2 securely to

four nuts (12) and associated washers.

prevent damage to adjacent hardware while

(3) Reconnect wires to six terminals of AIPS3.

performing steps (4) and (5).

Remove tags from wires.

(4) Remove four nuts (12) and associated

(4) Replace top and bottom access covers (para

washers securing power supply AIPS2 to rear panel of

5-14b).

control-interface unit.

(5) Remove power supply AIPS2, being careful

5-21. Removal and Replacement of Electrical

to clear rear panel.

Equipment Housing 1A1(fig. 5-3)

b. Replacement. Replace power supply AIPS2 as

a. Removal. Remove electrical equipment housing

follows:

1A1 (15, fig. 5-3) as follows:

(1) Verify that base of power supply A1PS2 (13) and

(1) Remove top and bottom access covers from

mounting surface on rear panel are completely coated

control-interface unit (para 5-14a) Place control-interface

with silicone heat sink compound. Apply silicone heat

unit in its normal operating position.

sink compound (Dow Corning 340) as required to

(2) Loosen four screw lock assemblies (8)

uncoated areas.

securing connectors PI (9) and P2 (10) to J15 and J16,

(2) Position replacement power supply AIPS2

respectively, on circuit card assembly rack I A2 (11)

on mounting surface on rear panel. Secure in place with

(3) Disconnect connectors PI and P2 from J 15

four nuts (12) and associated washers.

and J16, respectively, and set aside carefully.

(3) Reconnect wires to seven terminals of

(4) Loosen, but do not remove, four Allen

A1PS2. Remove tags from wires.

screws (6) on right side support of electrical equipment

(4) Replace top and bottom access covers (para

housing IAI.

5-14b).

(5) Loosen, but do not remove, four nuts (I)

5-20. Removal and Replacement of Power Supply

securing power supply A I1'S 1 (7) to rear panel of

A1PS3 (fig. 5-3)

control interface unit.

a. Removal Remove power supply AIPS3 (14, fig.

NOTE

5-3, sheet 2) as follows:

It may be necessary to disconnect five

wires on power supply AIPSI (para 5-18a)

WARNING

to perform step (6).

Ensure all power is disconnected from equip ment.

(6) Loosen power supply A1PS1 (7) sufficiently

(1) Remove top and bottom access covers from

to gain access to the four Allen screws (6) on left side

control-interface unit (para 5-14a).

Place control-

support of electrical equipment housing I AI Repeat step

interface unit on its left side.

(5) as required.

5-14