TM 11-6625-1702-12
Checks and corrective measures
Probable trouble
Trouble
symptom
Item
Higher
category
of
maintenance
Defective
voltage
regulator
.
.
(1)
(1)
Voltage
at
MV
OUTPUT
a.
3
is
required.
terminals
very
unstable
and
sensitive.
Higher
category
of
maintenance
voltage
divider
(1)
Load
resistor,
(1)
b.
Output voltage zero - - - - - -
is
required.
defective
or
voltage
regulator
shorted.
Higher
category
of
maintenance
(1)
Capacitor
or
microammeter
de-
(1)
c.
Output
voltage
okay
but
is
required.
fective.
reads
microammeter
high.
Higher
category
of
maintenance
Defective
microammeter
-
-
(1)
(1)
d.
Output
voltage
okay
but
is
required.
reads
microammeter
low.
Replace
the
TUNE
INDICATOR
Defective
TUNE
INDICATOR
.
(1)
(1)
4
a.
TUNE
INDICATOR
fails
on
the
control p a n e l
to
light.
16).
category of
maintenance
Higher
(2)
Defective
transistor
or
resistor
_
(2)
is
required.
Higher
category of
maintenance
(1)
Defective
transistor,
re-
(1)
b.
TUNE
INDICATOR
does
is
required.
sistor,
or
capacitor.
not
extinguish
when
test
coupler
is
connected
and
MV
ADJUST
control
is
fully
counterclockwise.
Higher
category of
maintenance
(1)
Defective
capacitor,
or
(1)
TUNE
INDICATOR
does
c.
is
required.
transistor.
not
reach
full
brilliance.
Higher
category of
maintenance
(1)
(1)
Defective
transistor
-.-
.
.
d.
Repetition
period
too
long
is
required.
(greater
than
20
ms)
when
TUNE
INDICA-
TOR
reaches
full
brilli-
ance.
a.
5
Higher
category of
maintenance
(1)
Defective
power
sensor,
RF
SE-
(1)
Test
coupler
does
not
is
required.
LECT
switch,
or
associated
cycle.
connectors
or
wiring.
category of
maintenance
Higher
b.
(1)
Defective
test
coupler
or
wir-
(1)
TUNE
INDICATOR
does
is
required.
not
extinguish
and
test
ing.
coupler
does
not
stop
tuning
when
rf
is
re-
moved.
Higher
category of
maintenance
a.
Test
coupler
does
not
6
(1)
Defective
RF
SELECT
switch
(1)
is
required.
cycle.
or
associated
connectors
or
wiring.
Higher
category of
maintenance
b.
(1)
Defective wiring - - - - - - - - - - - - - - - - - - (1)
TUNE
INDICATOR
does
is
required.
not
extinguish
and
test
coupler
does
not
stop
tuning
when
rf
is
re-
moved.
maintenance
is
7
a.
437S-1 type test coupler Defective test coupler - - - - - - - - - - - - - - - - -
Higher
category
of
required.
operates.
--------
maintenance
is
b.
437S-lA
type
test
coupler
Defective
test
coupler
Higher
category
of
required.
does
not
operate.
(2) Pull out the defective lamp from the
R e p a i r s and Adjustments
indicator jewel.
a. Replacement of Indicator Lamps.
( 3 ) Replace the defective lamp with a
(1) Rotate the indicator jewel counter-
new one of identical rating by pressing it into
c l o c k w i s e and remove it from the indicator
light assembly.
t h e indicator jewel.
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