TM 11-6625-828-45
Malfunction
Probable cause
Corrective acts
11.
%M meter M102 needle does
Defective electron tubes V116 and
Replace defective tubes.
not respond to movement of 90-
V11S.
MOD
control
R130
with
Defective meter M102.
Replace meter.
MODULATION switch S102 at
Defective meter circuit.
Check details of meter circuit.
the 90- position and cannot be
Defective potentiometer R130.
Replace defective parts.
aligned with the meter redline.
Defective electron tubes V103 and
Replace potentiometer.
V104.
Replace defective tubes.
Defective diodes CR103 and CR104.
Replace defective diodes. Check de-
tails of variable amplifier and
Defective resistor R133.
limiter
circuits.
Replace
Defective ratio detector-discriminator
defective parts.
Z101.
Replace resistor.
Defective switch S102.
Check details of Z101 circuit. Replace
Defective 90cycle filter Z102.
defective parts.
Defective potentiometer R144.
Replace switch.
Defective resistors R145, R146, R149,
Replace filter.
R151, and R153.
Replace potentiometer.
Defective electron tube V105.
Replace defective resistors.
Defective Resistors R161 and R231.
Defective electron tubes V116 and
Replace tube. Check details of 90-to
V115.
150-cycle filter amplifier circuit.
Defective meter M102.
Replace defective parts.
Defective meter circuit.
Replace defective resistors.
Replace defective tubes.
Defective potentiometer R144.
12.
%M meter M102 needle does
Defective electron tubes V103 and
Replace meter.
not respond to movement of 150-
V104.
Check details of meter
circuit.
MOD
control
R144
with
Defective diodes CR103 and CR104.
Replace defective parts.
MODULATION switch S102 at
Replace potentiometer.
the 150- position and cannot be
Defective resistor R133.
Replace defective tubes.
aligned with the meter redline.
Defective ratio detector-discriminator
Z101.
Replace defective diodes. Check de-
Defective switch S102.
tails of variable amplifier and
Defective 150-cycle filter Z103.
limiter
circuits.
Replace
Defective resistors R147, R148, R150,
defective parts.
R152, R154, and R157.
Replace resistor.
Defective electron tube V105.
Check details of Z101 circuit. Replace
defective parts.
Defective resistors R161 and R231.
Replace switch.
Defective electron tubes V116 and
Replace filter.
V115.
Replace defective resistors.
Defective meter M102.
Defective meter circuit.
Replace tube. Check details of 90- to
150-cycle filter amplifier circuit.
Defective pickup coil L103.
Replace defective parts.
13.
RF meter M101 needle does not
Defective capacitor C104.
Replace defective resistors.
align with meter red LEVEL SET
Defective switch S102.
Replace defective tubes.
line and
%M
meter M102
Defective variable amplifier circuit,
needle does not indicate in the
limiter circuit, or ratio detector-
Replace meter.
broad
red
area
when
discriminator Z101 circuit.
Check details of meter circuit.
MODULATION switch S102 is in
Replace defective parts.
any of the AMP LOC positions.
Defective 90-cycle filter Z102 or 150-
Replace pickup coil.
cycle filter Z103.
Replace capacitor.
Replace switch.
Check details of variable amplifier,
limiter,
or
ratio
detector-
discriminator circuits. Replace
defective parts.
Replace defective filter.
2-5