Replacement of Parts in Power Supply Chassis Assembly 1A1A13

TM 11-5820-695-35

Figure 3-6. Radio patch panel (p/o 1A15), top interior view, part location.

(f) Release meter panel assembly

multiplier metering

1A15A8 and position it downward until it rests against

circuits (para 3-59).

electrical equipment cabinet 1A15.

1A16AR5 ............................ Calibration of T-1054/

(g) Tighten the two screws from front

GRC-144 reflected rf

of 1A15A8 (C, fig. 3-8) to secure the housing to the

power metering circuit

cover.

(para 385).

(h) Insert the lens assembly into the

1A15A8R6........................... Calibration of T-1054/

housing so that the bulb board slot aligns with the bulb

GRC-44 rf power

board index key (D, fig. 3-8).

metering circuit (para

13-57).

(i) Replace the new lens and diffuser

1A15A8R7........................... Calibration of T-1054/

with the lens and diffuser of replaced indicator light

GR-144 traffic meter-

assembly (B, fig. 3-8).

ing circuit I(para 3-60).

(j) Rotate lens assembly 90 so that

3-22. Replacement of Parts in Power Supply

lens and legend index it at top of light, 'then push lens

Chassis Assembly 1A1A13

assembly into housing.

(fig. 3-9 through 3-11).

(k) Finger tighten the two meter panel

captive screws to secure meter panel assembly

To replace any part in power supply chassis assembly

1A15A8.

1A1A13; remove power supply 1A1 (a below) and refer

c. Replacement of Potentiometer 1A15A8R2

to applicable replacement procedure (b through f below)

through 1A14A8R7 (fig.

3-4).

To replace a

for the part to be replaced. After the part has been

potentiometer, remove equipment power (para 320a),

replaced, refer to the steps of g below for replacement

replace the defective potentiometer, restore equipment

of power supply 1A1. Parts, located on terminal boards

power (para 3-20b) and then perform the applicable

1A1A13TB1 and 1A1A14TB2 are removed using

calibration procedure listed in the chart below.

standard soldering techniques (para 3-19).

POTENTIOMETER CALIBRATION

a. Removal of Power Supply 1A1.

Potentiometer

Calibration procedure

(1) Set the POWER ON/OFF switch on

1A15A8R2, A15A8SR3,

Calibration of T-1054/ and

meter panel assembly 1A15A8 to OFF.

1A15ASR4.

GRC-144 frequency

Potentiometer

Calibration procedure

3-37