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TM 11-6625847-12
4-15.
Test Set, Trouble Isolation Chart
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
1
POWER indicator will not
a. Defective external 28-volt
a. Higher category repair re-
illuminate.
dc power supply.
quired.
b. Improper seating of input
b. Tighten power connector.
power connector.
c. Defective fuse----------------------------
e. Replace fuse.
d. Defective indicator light ----------------
d. Replace indicator light. "-/
e. Defective POWER switch--------------
e. Higher category repair re-
quired.
2
Adjustment of IF OSCIL-
a. Defective switch--------------------------
a. Higher category repair re-
LATOR 11.75 MC out-
quired.
put level control fails
b. Defective IF OSCILLATOR
b. Higher category repair re-
to produce correct fre-
control.
quired.
quency indication.
3
Rotating IF OSCILLA-
a. Defective IF OSCILLATOR
a. Higher category repair re-
TOR 11.75 MC output
control.
quired.
level control does not
b. Defective oscillator assem-
b. Higher category repair re-
vary output rf level
bly.
quired.
from 0 to 300 mv; how-
ever, correct frequency
indication is present.
4
Adjustment of IF OSCIL-
a. Defective switch -------------------------
a. Higher category repair re-
LATOR 2 1.75,15 MC
quired.
output level control fails
b. Defective IF OSCILLATOR
b. Higher category repair re-
to produce correct fre-
control.
quired.
quency indication.
c. Defective oscillator assem-
c. Higher category repair re-
bly.
quired.
5
Rotating IF OSCILLA-
Defective oscillator --------------------------
Higher category repair required.
TOR 2 1.7515 MC out-
level control does not
vary rf output level
from 0 to 300 mv; how-
ever, correct frequency
indication is obtainable.
6
Adjustment of IF OSCIL-
a. Defective switch -------------------------
a. Higher category repair re-
LATOR 3 1.7525 MC
quired.
output level control fails
b. Defective IF OSCILLATOR
b. Higher category repair re-
to produce correct fre-
control.
quired.
quency indication.
c. Defective oscillator assem-
c. Higher category repair re-
bly.
quired.
7
Rotating IF OSCILLA-
a. Defective IF OSCILLATOR
a. Higher category repair re-
TOR 3 1.7525 MC output
control.
quired.
level control does not vary
b. Defective oscillator assem-
b. Higher category repair re-
rf output level from 0 to
bly.
quired.
300 mv; however, cor-
rect frequency indica-
tion is obtainable.
8
Correct signal not obtain-
a. Broken or improperly seated
a. Higher category repair re-
able at PULSE GEN-
connector.
quired.
ERATOR OUTPUTS 3
b. Defective pulse generator--------------
b. Higher category repair re-
connector. quired.
9
Correct signal not obtain-
Same as 8 above ----------------------------
Same as 8 above.
able at PULSE GEN-
ERATOR OUTPUTS 2
connector.
10
Correct signal not obtain-
Same as 8 above ----------------------------
Same as 8 above.
able at PULSE GEN-
ERATOR OUTPUTS 1
connector.
4-6

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