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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
Probable cause
Malfunction
Corrective action
6- continued
b. Loss of ac input volt-
indicator
DSC688. If no
age to megohmmeter
indicator DSM694.
voltage, replace
capacitance indi-
cator DSC688.
(Refer to para-
graph 4-8.)
a. Faulty switch S403.
a. Check and replace
7. When simulating
as required.
probe capacitance,
(Refer to para-
rotation of
graph 4-9.)
PROBE MMF
b. Short or significant
b. Check and replace
range selector
value change of
as required.
switch S403 (28,
(Refer to para-
capacitor C403,
figure 2-1) does
graph 4-12. )
not cause proper
C404, C405 or
C406.
CAPACITANCE
INDICATOR (6)
reading.
a. Faulty switch S402.
8. When simulating
a. Check and replace
as required.
probe capacitance,
rotation of
(Refer to para-
PROBE MMF
graph 4-9.)
range selector
switch S402 (29,
figure 2-1) does
b. Check and replace
b. Short or significant
not cause proper
value change of
as required,
CAPACITANCE
capacitors C407,
(Refer to para-
INDICATOR (6)
C408, C409, C410
graph 4-12.)
reading.
or C411.
9. When simulating
Faulty variable capacitor
Check and replace as
probe capacitance,
C401.
required. (Refer to
rotation of PROBE
25-250 MMF con-
trol (27, figure
proper CAPACI-
TANCE lNDICATOR
(6) reading.
10. When simulating
Faulty variable capacitor
Check and replace as
compensator
C402.
required. (Refer to
rotation of
COMP 25-250
MMF control (22,
figure 2-1) does
not cause proper
CAPACITANCE
INDICATOR (6)
reading.
4-10
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