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Localizing Troubles - TM-11-6625-564-450031
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TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
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Radio Set Simulator Troubleshooting Chart. (cont)
C2, TM 11-6625-564-45
Symptom
Step No.
Correction
Probable trouble
c. XMIT lamp does not
c. Power switch CBl is defective.
c. Replace switch CB1.
Replace relay K1.
light when PTT switch  Relay K1 is defective.
Replace relay K2.
is depressed.
Relay K2 is defective.
Replace PTT switch S2.
PTT switch S2 is defective.
d. Replace switch CB1.
d. POWER switch CBl is defective.
d. T/R lamp does not
Replace resistor R1.
Resistor Rl is defective.
light.
Replace relay K1.
Relay K1 is defective.
Replace relay K2.
Relay K2 is defective.
e. Replace switch CB1.
e. POWER switch CB1 is defective.
e. T/R+G lamp does not
Replace relay K1.
light.
Relay K1 is defective.
Replace relay K2.
Relay K2 is defective.
f. SQ. DIS lamp does
f. Replace switch CB1.
f. POWER switch CBl is defective.
not light.
Replace relay K2.
Relay K2 is defective.
3
a. Use voltage and resistance read-
a. A component of audio amplifier
a. Audio from test unit no
ings given in figure 2-14 to
good in headset at
1A2 is defective.
radio set simulator.
isolate trouble. Replace defec-
tive part.
Use voltage and resistance read-
A component of transient blanker
ings given in figure 2-16 to
1A4 may be defective and,
isolate trouble. Replace defec-
therefore, may not be supply-
tive part.
ing the correct voltage to the
amplifier.
b. Replaces AUDIO GAIN potenti-
b. Audio of a above is not
b. AUDIO GAIN potcntiometer is
varied when AUDIO
ometer R23.
defective.
GAIN is controlled.
A componet of audio amplifier
4
Use voltage and resistance read-
Audio from headset at
1A1 id defective.
ings given in figure 2-13 to iso-
radio set simulator not
late trouble. Replace defective
good in headset at test
unit
part.
Use voltage and resistance read-
A component of transient blanker
ings given in figure 2-16 to iso-
1A4 may be defective and, there-
late trouble. Replace defective
fore, may not be supplying the
part.
correct voltage to the amplifier.
Replace relay K1.
Relay K1 defective.
Positive 225 volts dc not
5
present at pin H of J2,
Use voltage and resistance read-
with PTT switch pot
A component of power converter
ings (fig. 2-15) to isolate trouble.
depressed.
1A3 is defective.
Replace defective part.
Use voltage and resistance readings
A component of transient blanker
given in figure 2-16 to isolate
1A4 may be defective; and there-
trouble. Replace defective part.
fore may not be supplying the
correct voltage to the amplifier.
Use voltage and resistance read-
Positive 9.65 volts + 1 volt
A component of power converter
6
ings (fig. 2-15) to isolates trouble.
ac PP is not present at
1A3 is defective.
Replace defective part.
pin L of J20.
Replace defective part.
R17, CR3, or CR4 may be defective.
Replace diode CR1.
Meter M1 does not indi-
Diode CR1 is defective.
7
Replace meter M1.
cate in the green sector
Meter M1 is defective.
TEST SELECT switch S1
Replace switch S1.
of scale A when TEST
is defective.
SELECT switch Sl is
Use voltage and rcsistance read-
A component of power converter
set to ADF.
ings (fig. 2-15) to isolate trouble.
lA3 is defective.
Replace defective part.
23

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