Quantcast Radio Set Simulator Troubleshooting Chart. (cont)

 

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Radio Set Simulator Troubleshooting Chart.
Up
TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
Next
Stage Gain Measurements
TM 11-6625-564-45
Correction
Step No.
Probable trouble
Symptom
Resistor R8 or R10 may be defective.
Replace defective resistor.
Replace defective part.
Relay K2 or POWER switch CB1
may be defective.
Replace defective resistor.
Resistor R3 may be defective.
deter M1 does not indi-
Diode CR1 is defective.
8
Replace diode CR1.
cate in the green sector
Meter M1 is defective.
Replace meter M1.
of scale A when TEST
TEST SELECT switch S1 is defective.
Replace switch S1.
SELECT switch S1 is
Bench +27.5-volt dc supply may be
Adjust or replace +27.5-volt dc
set to +27.5V.
defective.
supply.
Replace defective resistor.
Resistor R9 or R11 may be defective.
Replace diode CR1.
9
deter M1 does not indi-
Diode CR1 is defective.
cate in the green sector
Meter M1 is defective.
Replace meter M1.
of scale A when TEST
TEST SELECT switch S1 is defective.
Replace switch S1.
SELECT switch S1 is
A component of power converter
Use voltage and resistance read-
ings (fig. 2-15) to isolate trouble.
set to +225V.
1A3 is defective.
Replace defective 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 defective resistor.
Resistor R12 or R13 may be defec-
tive.
Meter M1 indicator does
Replace diode CR1.
Diode CR1 defective.
10
not sweep from 0-8 as
Meter M1 is defective.
Replace meter M1.
the SENSIVITY control
TEST SELECT switch S1 is defective.
Replace switch S1.
on the test unit is ro-
Resistor R6 or R7 may be defective.
Replace defective resistor.
tated when TEST SE-
LECT switch S1 is set
to REMOTE SENS.
11
Diode CR1 is defective.
Meter M1 does not indi-
Replace diode CR1.
Meter M1 is defective.
cate in the green sector
Replace meter M1.
of scale A when TEST
TEST SELECT switch S1 is defective.
Replace switch S1.
Resistor R4, R5, or R14
SELECT switch S1 is
Replace defective resistor.
may be defective.
set to SHIELD GND.
Relay K2 or POWER switch CR1
Replace defective part.
may be defective.
12
Meter M1 does not indicate
Diode CR1 is defective.
Replace diode CR1.
CAL on scale B with
Meter Ml is defective.
Replace meter M1.
TEST SELECT switch
Replace switch S1.
TEST SELECT switch S1 in defective.
S1 in VSWR CAL and
Use voltage and resistance read-
A component of power converter
while rotating VSWR
ings (fig. 2-16) to isolate trouble.
1A3 is defective.
CAL control R2 with
Replace defective part.
PTT switch S2 de-
Use voltage and resistance read-
A component of transient blanker
pressed.
ings given in figure 2-16 to iso-
1A4 may be defective and, there-
late trouble. Replace defective
fore, may not be supplying the
correct voltage to the amplifier.
part.
Replace defective relay.
Relay K1 or K2 may be defective.
PTT switch S2 or POWER switch
Replace defective switch.
CB1 may be defective.
VSWR CAL potentiometer R2 may
Replace R2.
be defective.
Uhf test generator 1A5 may have
Use voltage and resistance read-
a defective component.
ings (fig. 4-13) to isolate trouble.
Replace defective component.
24
Change 2

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