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  TM 11-6130-243-12
b. Troubleshooting Chart.
Sequence
Probable trouble
Corrective measures
Item to reinspected
No.
Defective indicator lamp, or no power Check power input. If correct, replace indicator
1
Indicator lamp does not illuminate.
lamp (para 3-1 1).
input.
Connections to meter faulty or Check for loose connection in output circuit.
DIRECT CURRENT VOLTS meter
2
defective.
Check connections to meter. If meter connections
does not indicate properly.
are not faulty, higher category maintenance is
required.
DIRECT CURRENT AMPERES
Connections to meter or to AM- Check for loose connections at meter and switch. If
3
connections are not faulty, higher category
meter does not indicate properly.
METER switch faulty or defective.
maintenance is required.
Voltage indication on DIRECT
Defective VOLTAGE ADJUST Higher category maintenance is required.
4
switch.
CURRENT VOLTS meter does not
respond to change in position of
VOLTAGE ADJUST switch.
5
Defective circuit breaker switch . . . . Higher category maintenance is required.
With POWER ON circuit breaker
switch set to OFF, DIRECT CUR-
RENT VOLTS meter does not
indicator O, and indicator lamp
does not extinguish.
6
Overheating . . . . . . . . . . . . . . . . . . . . . .
Poor ventilation . . . . . . . . . . . . . . . . . Check vent openings for excessive dirt or foreign
matter.
3-11.
Replacement of Indicator Lamp
c. Pull the defective lamp out and replace it with a
new one. Push the new lamp in and twist it clockwise to
a. T u r n t h e r e d i n d i c a t o r j e w e l c o u n t e r c l o c k w i s e
lock it.
and pull it out to expose the defective lamp.
b. Press in the lamp and turn it counterclockwise to
d. Secure the red indicator jewel in place by turning
unlock it.
it clockwise.
Change 2 3-4
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