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Figure 2-27. Test unit TB1 of audio amplifier 3A1, rear view, showing location of parts.
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TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
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Localizing Troubles - TM-11-6625-564-450064
TM 11-6625-564-45
Figure 2-28. Component bracket on test unit chassis,
showing location of parts.
resistance measurement diagram for audio am-
2-8. localizing Troubles
plifier 3A1 is figure 2-29. Chassis resistance
a. General Instructions. In the trouble-
and continuity measurement procedures for the
shooting chart in b below, procedures are out-
test unit are given in paragraph 2-7c. If op-
lined for localization of trouble by operation
erational symptoms are not known or if they
of the test unit with the radio set simulator in
indicate possibility of short or open circuits,
a self-testing mode. Connect the equipment
make the resistance and continuity tests indi-
as shown in the interconnecting block diagram
cated in paragraph 2-7c before proceeding.
in figure 3-1, TM 11-6625-564-12. The parts
Note: If the symptoms indicate trouble in audio am-
locations of the test unit are given in figures
plifier 3A1, proceed to paragraph 2-8c before making
2-23 through 2-28. The test unit voltage and
voltage and resistance measurements.
Correction
Step No.
Symptom
Replace lamps.
Lamps may be burned out.
Indicator lamp does not
light.
a. Replace CB1.
a. POWER switch CB1 is defective.
2
a. T/R lamp does not light
when Function SE-
LECT switch S4 is
Replace S4.
FUNCTION SELECT switch
set to T/R.
S4 is defective.
When
lamps
are
not
b. POWER switch CB1 is defective.
b. Replace CB1.
burned h. T/R&G lamp does not
Replace S4.
FUNCTION SELECT switch
out.
light when FUNC-
S4 is defective.
TION SELECT
switch S4 is set to
T/R+G.
52

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