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Page Title:
Table 4-1. Troubleshooting Chart-continued |
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 TM 55-4920-325-14&P
Table 4-1. Troubleshooting Chart -continued
Corrective action
Probable cause
Malfunction
c. Replace capaci-
c. Defective capacitance
4 - continued
tance indicator.
indicator DSC686.
(Refer to para-
graph 4-8.)
a. Use VOM to make
a. Open within megohm-
5. When measuring
power-off conti-
meter range selec-
resistance, rota-
nuity check. Re-
tor circuit.
tion of Megohm-
pair as required.
meter RANGE
b. With power off,
b. Open within megohm
SELECTOR
use volt-ohmme-
meter indicator
switch (17, figure
ter and check for
DSM694.
proper resist-
proper effect on
ance across
MEGOHMMETER
GROUND termi-
indicator (14)
nal E101 (5, fig-
pointers.
ure 2-1) and
connector P103
pins as follows:
P103-J-1000
megohms 1%
P103-K-100
megohms 1%
P103-K-100
megohms 1%
P103-B-10
megohms +1%
P103-C-1
megohm1%
Replace megohm-
meter indicator if
resistance is not
as specified above.
(Refer to para-
graph 4-8.)
a. Check and replace
a. Open potentiometer
6. MEGOHMMETER
potentiometer as
R107.
indicator (14, fig-
required. (Refer to
ure 2-1) completely
inoperative.
b. Use UTVM and
check for ac
voltage between
P103-D and -E
and P103-F and
-E of megohmme-
ter indicator. If
no voltage, check
for ac voltage
across same pins
of capacitance
4-9
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