Isolating Troubles in T-1054(P)/ GRC-144(V) Primary Power Distribution Circuits

TM 11-5820-695-35

Item No.

Symptom

Probable trouble

Corrective actions

Cable loopback test

a. Coaxial cable 1A15W7 or

Check coaxial

(TM 11-5820-695-12)

1A15W4.

Cables 1A15W7 and

indicates that Radio

1A15W4 (fig. 3-13)

Set AN/GRC-144(V)3

by substitution,

of AN/GRC-144(V)4

using an external

is faulty.

hookup.

Digital data combiner

Check digital data

1A12 chassis defective.

combiner 1A12

chassis by substitution.

3-7. Isolating Troubles in T-1054(P)/ GRC-144(V)

(3) Remove composite assembly 1A13/

Primary Power Distribution Circuits

1A14 (para 3-30).

Procedure.

WARNING

(1) Refer to the chart (c below) and

connect the multimeter leads between the two pins

115 vac is present in T-1054(P)/ GRC-

referenced in the troubleshooting chart (para 3-6 ) by

144(V). Do not perform any of the

section and step number. If the troubleshooting chart

continuity or resistance checks given

indicates a section but does not give a step number,

this

paragraph

while

the

perform all of the steps given in that section starting with

equipment is connected to the

step a.

primary power source.

(2) Observe that multimeter indication is

Preparation of T-1054(P)/GRC-144(V).

within the tolerance specified in the chart for each step.

If it is not, refer to the T-1054(P)/GRC-144(V)

(1)

Remove power supply 1A1 (para 3-22).

interconnecting diagram (fig. 5-15 or 5-15.1) to

determine whether the fault is defective wiring or a

(2) Remove switch 1A15A8S3 protective

defective circuit element.

cover (fig. 3-4) by removing the two nuts and screw that

secure it to meter panel assembly 1A15A8.

Change 6 3-11