Disassembly

TM 11-6720-242-35

Cover (MP186)

Dust cover (transit body cover) (MP181)

Screw (H103-124)

Catch (luggage catch) (M.P179-180)

Gasket (shielding gasket) (MP188)

Rivet (H95-98)

Screw (H,164471)

Gasket (MP182)

Nut plate (MP258)

Cover (MP183)

Cover (MP265)

Screw (H99-102)

Screw (H176-185)

Cover (prism cover) (MP268)

Gasket (MP186187)

Screw (MP272-274)

Strike (MP40-4043)

Gasket (MP269-Z70)

Screw (H125-126)

Glet (MP271)

Pin (MP263)

Dust cap (MP169)

198

Housing (MP204)

Dust cap (MP170)

(3) The positioning of the two bars (15, fig. 3-

10) on angle (6) will govern the positioning of the board

(2) Remove the four screws (8) from the

horizontally. The slots through which the attaching

underside of chassis (36) and withdraw the power supply

screws are threaded into the bars permit the

assembly (7) from the mating connector.

adjustments needed to obtain the designated vertical

(3) If malfunctioning has not been isolated to

dimension.

a part, refer to paragraph 3-5 and perform the test

(4) Mount the two bars (15) on angle (6) but

procedures before disassembly.

do not tighten the screws. Position the board over the

b. Disassembly (fig. 3-10).

bars and thread screws (13) into the bars from the

NOTE

underside of angle (6). Do not fully tighten the screws.

Before removing an electrical part, note

(5) Adjust the board to comply with the 0.905-

its orientation and tag the connection

inch dimension shown in figure 811. The holes through

points.

which screws (13, fig. 3-10) are threaded into bars (15)

(1) Remove four screws (2), lockwashers (3),

are oversized to permit movement. When the

and flatwashers (4) attaching the two covers (1) to the

measurement has been obtained, tighten screws (13).

assembled angles (6 and 7). Separate the angles. A pad

(5) is cemented to the inside of each cover (1) and

(6) Readjust the board until it extends beyond

unless damaged need not be disassembled.

angle (6) a distance of 0.336 inch and its elevation in

the slot complies with the 0.462-inch dimension shown

(2) Remove screw (9) and saddle washer (10)

in figure 3-11.

attaching cable clamp (11) to angle (7).This will give

(7) Tighten the four screws (13, fig. 3-10) and

leeway to harness (8)

recheck the dimensions.

(3) From the outer surface of angle (6)

(8) Test the reassembled power

supply

remove the two screws (13) attaching transformer (12)

assembly as described in paragraph 3-5.

and transformer (14).

b. Installation of Power Supply Assembly (fig. 38).

(4) Remove four screws (13) attaching power

(1) Install the power supply assembly in the

supply board assembly (16) to the two bars (15),

reverse sequence of the removal procedures of

attached to angle (6). Withdraw the hoard assembly.

paragraph 3-25a.

(2) Coat the bottom of the power supply

(5) Position the board assembly (16) with the

housing and the contacting area of the chassis with

wiring side facing up and indicate the connection point

silicone grease.

on each wire. Then unsolder the wires from the

(3) Coat the threads of the attaching screws

connection points on the board assembly (16).

with glyptal.

3-26. Reassembly and Installation of Power Supply

Assembly

3-27. Removal and Replacement of Ac and Dc Circuit

a. Reassembly (fig. 3-10).

Breakers (fig. 3-8)

NOTE

(1) Reassemble the power supply assembly

A single procedure is given for the

in reverse of the disassembly procedures described in

removal and replacement of both

paragraph 3-25b above and in accordance with the

circuit breakers.

following special instructions.

(2) The positioning of the board assembly

(16) on angle (6) is critical and the dimensions shown in

figure 3-11 must be maintained.

3-17