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TM 55-4920-383-13&P
Table 4-4. Troubleshooting Chart
Malfunction
Probable cause
Corrective action
1.
Test Set completely
inoperative.
2. With DISPLAY TEST
switch depressed,
digital display (7) does
not display 8.8.8.8.8.8.
NOTE
Numbers in parentheses
refer to index numbers of
figure 2-1.
a. Fuse F1 open.
b. Main 115 VAC, 400 Hz
power source faulty.
c. Faulty POWER ON/OFF
switch S1.
d. DC power supply failure.
Burned out filament in digital
displays A1DS1 through A1
DS6.
a. Replace fuse.
b. Use digital voltmeter
and check input
power.
c. Replace switch S1.
d. On power supply
board A 5, check
voltage test points
(see paragraph
4-14 a (4). Replace
power supply A 5 as
required.
Check and replace A1DS1
through A1DS6 as re-
quired.
4-16
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