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

14 Speaker output low---------------------------a. Defective component or wire in

a. Perform the electrical equipment

electrical equipment cabinet

cabinet 1A16 checks (para

1A16.

3-11, section 7 (step i, J, and

k)).

b. Speaker 1A15A8LS1 defective--------------b. Check ea- r 1A15A8LS1 by

substitution (fig. 3-4).

c. Orderwire chassis 1A13A7

c. Replace orderwire chassis 1A13A7

defective.

(para 3-30).

Both the green and red lamps

Defective wiring between indicator

Use the T-1064/GRC-144 inter-

of any status or alarm in-

and its associated lamp driver.

connecting diagram (fig. 5-15)

dicator lighted

and TS-862 B/U to isolate the

defective wiring.

RING indicator does not

a. Defective wiring in electrical

a. Perform the electrical equipment

light amber when 1600

equipment 1A16.

cabinet 1A15 checks (para

Hz ring signal is present.

3-11c, section 8 (step u)).

b. Orderwire chassis 1A18A7

b. Replace orderwire chassis 1A18A7

defective

(para 3-30).

CNTRL ALARM indicator

a. Defective wiring in electrical

a. Remove the orderwire assembly

lighted red (all other

equipment cabinet 1A15.

1A13 (para 3-30) and use the

alarm indicators lighted

TS-..52 B/U to check for eon-

green).

tinuity between pins 22, 23, and

25 of connector A165W27XA13B

and CABINET GROUND lug

E1 (fig. 6-15). If continuity is

obtained, perform the electrical

equipment cabinet lA16 checks

(para 3-11c, section 7 (steps

p, q, and r).

b. Orderwire chassis 1A18A7

b. Replace orderwire chassis 1A1A7

defective

(para 3-0).

TRAF indicator lighted red-----------------a. Defective wiring in plate assembly

a. Perform the plate assembly 1A16

1A16

checks (para -10c sections

2, 3, 5, and 6).

b. Defective wiring in electrical

b. Perform the electrical equipment

equipment cabinet 1A1.

cabinet 1A16 cheeks (para

3-11c, sections 4 and 5).

c. Digital data modem chassis

e. Replace digital data modem chassis

1A12A12 defective.

1A12A12 (para 8-29).

RF POWER indicator lighted

a. Coaxial cable 1A16W22 defective----------a. Turn meter selector switch on

red.

meter panel assembly 1A15A8

to 3RD MULT (LOCAL OSC).

If meter indication is not in the

yellow band, proceed to step f

below. If meter indication is in

the yellow band, remove alarm-

monitor 1A5 and perform the

plate assembly 1A16 checks

(para 8-1oa, section 4, (step o)).

b. Transmitter frequency mixer

b. Check transmitter frequency mixer

stage 1A9 defective.

stage lA9 by substitution

(TM 11-5820-695-12).

c. Radio frequency bandpass filter

c. Check radio frequency bandpass

1FL3 defective

filter 1FL8 (para 3-36) by

substitution.

d. Radio frequency low pass filter

d. Check radio frequency low pass

1FL4 defective.

filter 1FIA by substitution (para

e. Connector adapter 1CP4 or direc-

e. Check connector adapter 1CP4 and

tional coupler lDC1 defective.

directional coupler 1DC1 by

substitution (para 336).

3-6