T-1054(P)/GRC-144(V) and T-1054 (P)A/GRC-144(V) Troubleshooting Chart-continued

TM 11-5820-695-35

NOTE

For Radio Sets AN/GRC-144(V)3 and AN/GRC-144()4 check Switch, Waveguide SC-D-958093-001

(AN/TRC-175) K band, SC-D-958093-002 (AN/TRC-138) SRWBR receiver, or SC-D-958093-003

(AN/TRC-138) SRWBR transmitter.

T-1054(P)/GRC-144(V) rf output

Same as item No. 19 in this chart

Perform the corrective action for

power less than 150 milli-

item No. 19 in this chart.

watts as determined by test

Switch, Waveguide SA-1679/GRC

b. Check Switch, Waveguide SA-

defective.

1679/GRC by substitution.

c. Adapter, Waveguide UG-1883/

c. Check Adapter, Waveguide UG-

GRC defective.

1883/GRC by substitution.

Cannot calibrate the T-

Defective component or wire in

Remove alarm monitor 1A5 (TM 11-

1054(P)/GRC-144(V) traffic

metering circuit.

5820-695-12) and check resis-

metering circuit (para 3-60).

tance between pin 12 of

connector 1A16W25XA6B and

the E1 CABINET GROUND lug

on top of 1A15 (fig. 5-15). Note

that resistance varies smoothly

from zero to 5,000 ohms as

potentiometer 1A15A8R7 (fig. 3-

4) is varied from one extreme to

the other.

Make the same

resistance check between pin 17

of 1A15A8S4B and pin 12 of

connector 1A16W25XASB.

Change 6 3-9