TM 11-6625-596-45
Action and indication
Possible cause
Correction
No signal at 1A3J8-H------------------------ Check continuity between 1A3A11-3
deflect when RINGER button is
and 1A3J8-H.
depressed
No signal at 1A3J8-F------------------------ Replace 1A3A8.
No signal at 1A3J8-Y------------------------ Check continuity (1A4S6C depressed)
between 1A3J8-Y, 1A4S6C-2, 1A4S6C-1,
and 1A3J8-F.
No signal at 1A3J&-W----------------------- Check continuity (1A4S6E depressed)
between 1A3J8-W, 1A4S6E-2, 1A4S6E-
1,
and 1A3J8-F.
No signal at 1A3J8-X------------------------ Replace 1A3A8.
No signal at 1A3J8-E------------------------ Replace 1A3A8.
No signal at 1A3J8-A------------------------ Check continuity between 1A3J8-E and
1A3J8-A.
Note. Greatly reduced amplitude ringe
No signal at 1A3J8-T------------------------ Check continuity between:
tests operate normally but meter
a. 1A3J8-7, 1A4S6N-7, and 1A3R13-3.
does not indicate on insulation resis-
b. 1A3R13-2 and 1A3J8-T.
tance tests
No signal at 1A3J8-S------------------------ Replace 1A3A8.
No signal at 1A3J8-Z------------------------ Check continuity between 1A3J8-S,
1A4S5A-11, 1A4S5A-10, and 1A3J8-Z.
No signal 1A3J8-X---------------------------- Replace 1A3A8.
No signal at 1A3J8-A------------------------- Check continuity between 1A3J8-X,
1A4S6N-4, 1A4S6N-5, and 1A3J8-A.
EARPHONES button 1A4S6G de-
Open switch------------------------------------ Check continuity between 1A4S6F-7,
pressed, no reading on meter.
1A4S6F-6, and 1A3J2-F.
Test microphone placed on test loud-
speaker; LEVEL and VALUE con-
trols 1A4AT1 through 1A4AT4 as
follows: A-10, B-8, C-6, D-10.
TEST CONDITION switch 1A4S9 to
COUPLER.
to DRIVER.
Press LOW button 1A4S5A. No
No signal at 1A4S9-3------------------------ Check continuity between:
reading on meter
a. 1A2A14J12-1 and 1A2A14R2-1.
b. 1A2A14R2-2 and 1A4S9-3.
Check 1A2A14C1 for short to ground
(TEST CONDITION switch 1A4S9
at ART REC momentarily).
Replace microphone 1A2A4A4 or inject
No signal at 1A4T2-10---------------------- Press READ MIC CURRENT button
1A4S5F and check for short from
1A4T2-2 to ground.
Check for short 1A4T2-10 to ground. If
no short, replace 1A4T2.
No signal at 1A4AT1-1------------------------
Check continuity between 1A4AT1-1
and 1A4T2-10.
No signal at 1A4AT1-3---------------------- Replace 1A4AT1.
No signal at 1A4AT2-1---------------------- Check continuity between 1A4AT2-1
and 1A4AT1-3.
No signal at 1A4AT2-3---------------------- Replace 1A4AT2.
No signal at 1A3J1-L--------------------------
Check continuity between 1AJ1l-L and
1A4AT2-3.
No signal at11A3J1-A-------------------------
Check for 10 volts de at 1A3Jl-C; replace
1A3A1.
No signal at 1A3FL-1--------------------------
Check continuity between 1A3Jl-A,
1A4S6H-1, 1A4S5B-3, and 1A4FLl-1.
No signal at 1A3FL1-3---------------------- Replace 1A3FL1.
No signal at 1A3J1-P--------------------------
1A4S6H-5, and 1A3Jl-P.
No signal at 1A3J1-R------------------------ Replace11A3A1.
No signal at 1A3J2-S------------------------- Check continuity between 1A3A1-R and
SOUND POWER TELEPHONE
1A4S5B-5.
button 1A4S6H depressed; no
Open switch------------------------------------ Check 1A4S6H.
deflection of meter.
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