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

TM 11-5820-695-35

Item No.

Symptom

Probable trouble

Corrective action

31 Meter indication for 3RD

a. Meter calibration required--------------a. Turn meter selector switch to 2ND

MULT (LOCAL OSC)

MULT. If meter indication is

meter selector switch posi-

not in yellow band, perform the

tion not in yellow band.

corrective action given for item

No. 30 in this chart. If meter

indication is in yellow band,

calibrate the 3RD MULT

(LOCAL OSC) metering cir-

cuit (para 3-59).

b. Coaxial circulator 1A10HY1

b. Replace coaxial circulator

defective.

1A10HY1 (para 3-27)

32 Meter indication for RF

a. Meter calibration required----------------a. Calibrate the T-1054(P)/GRC-144(V)

POWER meter selector

rf power metering circuit

switch position not in yellow

(para 3-57).

band.

b. Same as item No. 19 in this chart-----b. Perform the corrective action

given In item No. 19 in this

chart.

33 Meter indication for REFL

a. Meter calibration required---------------a. Calibrate the T-1054(P)/GRC -144(V)

RF POWER meter selector

reflected rf power metering

switch position is greater

circuit (para 3-58).

than 20.

b. Defective wiring in plate assembly

b. Perform the corrective action

1A16.

given for item No. 21 in this

chart.

34 Meter indication for OW

a. Defective wiring In plate assembly

a. Perform the plate assembly 1A16

TEST meter selector switch

1A16.

checks (para 3-10c, section 2).

position not 100 10.

b. Defective wiring in electrical

b. Perform the electrical equipment

equipment cabinet 1A15.

cabinet 1A15 checks (para

3-11c, sections 4, 5, and 7).

c. Digital data modem chassis

c. If standard cable terminal opera-

1A12A12 defective.

tion is being used, replace digital

data modem chassis 1A12A12

(para 3-29).

35 Modulator frequency not 50

a. Modulator frequency adjustment

a. Perform the modulator frequency

MHz +20 kHz as deter-

required.

adjustment (para 3-62).

mined by test (para 3-71).

b. Component 1A8 or 1A7

b. Check components 1A8 and 1A7

defective

by substitution (TM 1-5820-

695-12).

36 Electrical frequency synthe-

a. Defective component in electrical

a. One at a time, replace each com-

sizer 1A14 frequency error

frequency synthesizer 1A14.

ponent (1A14A1 through

greater than 3 kHz as

1A14A7) in electrical frequency

determined by test (para

synthesizer 1A14 (TM 11-

3-71).

5820-695-12).

b. Electrical equipment chassis

b. Replace electrical equipment

1A14A10 defective.

chassis 1A14A10 (para 3-31).

CHANGE 6

3-8.1/(3-8.2 blank)