Quantcast Localizing Troubles - TM-11-6625-564-450064

 

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Figure 2-28. Component bracket on test unit chassis, showing location of parts.
Up
TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
Next
Figure 2-29. Test unit amplifier 3A1, voltage and resistance measurements diagram.
C2, TM 11-6625-564-45
Step No.
Symptom
Correction
c. ADF lamp doer not
a. POWER switch CB1 is defective.
c. Replace CB1.
FUNCTION SELECT switch
light when FUNC-
Replace S4.
S4 is defective.
TION SELECT
switch S4 in ret to
ADF.
d. POWER SWITCH is defective.
d. Replace CB1.
d. XMIT lamp doer not
FUNCTION SELECT S4 is
light when FUNC-
Replace S4.
defective.
TION SELECT
switch S4 is ret to
T/R or T/R+G with
PTT switch S3 is defective
Replace S3.
PTT switch S3 ret
to either ON or
MOM ON.
Audio to radio ret simu-
MIC SELECT switch S2 is
3
Replace switch S2.
lator headset from test
defective (fig. 2-23).
unit headset not good.
A component of 3A1 is defective.
Use voltage and resistance read-
ings (fig. 2-29) to isolate
trouble. Replace defective part.
4
Audio signal applied to
Replace switch S2.
MIC SELECT switch S2 is defec-
DUM MIC jacks J16
and J17, with MIC SE-
LECT switch S2 in DUM
MIC position, is not heard
in radio ret simulator
headset.
Replace switch S1.
5
Audio to test unit head-
RF DET switch S1 is defective
set from radio net simu-
Replace potentiometer R1.
AUDIO GAIN potentiometer R1 de-
lator headset not good.
RF DET switch S1 in
fective (fig. 2-24).
Replace defective resistor.
OFF position.
Resistor R2 or R3 defective (fig.
Replace transformer T1.
Transformer T1 is defective (fig.
Replace potentiometer R4.
SENSITIVITY potentiometer R4
Radio ret simulator TEST
6
is defective (fig. 2-24).
SELECT switch S1 set
to REMOTE SENS.
When SENSITIVITY
control is rotated, meter
needle on radio set simu-
lator doer not deflect
smoothly across meter
face.
Replace switch S5.
SQ DIS switch S5 is defective (fig.
SQ DIS lamp on radio
7
set simulator does not
2-24).
light when SENSITI-
VITY control is turned
to SQ DIS.
The readout mechanism
8
on the radio set simu-
lator does not indicate
the frequency selected
when :
a. Replace switch S1.
a. The FREQ SELECT
a. Switch FREQ SELECT S1 is
10-megacycle control
defective (fig. 2-24).
is rotated.
53

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