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

f. Transmitter frequency mixer stage

f. Turn meter selector switch to ZND

1A9 defective.

MULT. If meter indication is

not in yellow band, proceed to

step q below. If meter indication

is in yellow band, check 1A9 by

substitution.

g. Transmitter frequency multiplier

g. Turn meter selector switch to

group lA10 defective.

AMPL-MULT. If meter indica-

tion is not in yellow band, pro-

ceed to step h below. If meter

indication is in yellow band,

check transmitter frequency

multiplier group 1A10 by

substitution (TM 11-5820-

696-12).

h. Defective wiring in plate assembly

h. Turn meter selector switch to

1A16.

SYNTHESIZER. If meter

indication is not in yellow band,

proceed to step k below. If

meter indication is in yellow

band, perform the plate assembly

1A16 checks (para -10c,

section 7).

t. Coaxial cable 1A15W16 defective-----------i. Check coaxial cable 1A15W16

(fig. 3-13) by substitution.

j. Coaxial circulator 1HY,1 defective-----------j. Check coaxial circulator 1HY1 by

substitution (para -28).

k. Defective wiring in electrical

k. Perform the electrical equipment

equipment cabinet lA15.

cabinet 1A15 checks (para

3-31, section 8).

l. Electrical equipment chassis

l. Replace electrical equipment

1A14A10 defective.

chassis 1A14A10 (para 3-31).

20 SYNTH LOCK indicator

a. Electrical equipment chassis

a. Check electrical equipment chassis

lighted red.

1A14A10 defective.

1A14A10 by substitution (para

3-S1).

b. Defective wiring -------------------------------- b. Remove electrical frequency syn-

thesizer 1A14 (para 38-1) and

alarm monitor 1A5, and check

for continuity between pin 7 of

connector 1A16W27XA14 and

pin 17 of connector 1A16W25-

XASB (fig. 5-15). Also check

resistance between pin 8 and 9

of connector 1A16W26XA5A.

Resistance should be greater than

10 ohms.

21 REFL RF POWER indicator

a. Coaxial cable 1W25 defective---------------a. Check coaxial cable 1W26 (fig.

lighted red.

3-13) by substitution.

b. Directional coupler 1DC1

b. Check directional coupler 1DC1 by

defective.

substitution (para 3-36).

c. Duplexer CU-1891/GRC defective----------c. Check Duplexer CU-1891/GRC

by substitution.

d. Switch, Waveguide SA-1679/

d. Check Switch, Waveguide SA-

GRC defective

1679/GRC by substitution.

22 CABLE TO RADIO MODEM

a. Defective wiring in electrical

a. Perform the electrical equipment

indicator lighted red.

equipment cabinet lA16.

cabinet 1A16 checks (para

(Applicable to standard

311c, sections 4 and 5).

cable terminal operation

b. Digital data modem chassis

b. Replace digital data modem chassis

only).

LA12A12 defective.

1A12A12 (par 3-29).

Change 6 3-6.1/(3-6.2 blank)