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 TM 55-4920-416-13
Section VI
NAVAER 17-15C-539
TABLE 6-1 (Cont)
TROUBLESHOOTING
TROUBLE
CAUSE
REMEDY
2.
Line fuse blows soon after ON-OFF
Shorted lead or connection in power cable.
Replace power cable or check for shorts.
switch is thrown.
DC OPERATION
Shorted leads to motor or pilot light.
Leads from J1 pin E to motor connector
and pilot light frayed and grounded. Repair
or replace.
Short in noise filter, or motor.
Remove connector P2 from motor. If fuse
does not blow when test set is turned on,
then short is either in the filter or motor.
Replace motor assembly.
AC OPERATION
Shorted leads to switch or fuse.
Remove mating connector to J1. With S1
open, resistance between prongs A and D
or B and C on J1: Infinity. Close S1.
Resistance between A and D or B and C:
Zero. Resistance between A and B or C
and D for S1 open or closed : Infinity.
Replace or repair shorted leads.
Shorted leads to transformer or shorted
Remove mating connector to J1.
transformer primary.
Resistance between prongs I and J on J1:
2.8 ohms. Resistance between either
prong and chassis : Infinity. Resistance
between pins 1 and 2 of transformer with
both leads disconnected 2.8 ohms. Repair
or replace grounded leads.
Replace
shorted transformer.
Shorted transformer secondary or rectifier.
Unsolder one yellow lead from transformer.
Turn on test set. If fuse does not blow,
then rectifier is shorted. Replace. If fuse
continues to blow, then transformer is
shorted.
3.
Indicator lamp out; motor does not run.
Power cable loose.
Tighten.
Line cord not plugged into live outlet.
Trace line failure.
DC OPERATION
Open lead in power cable or from power
Resistance between prongs of the line cord
receptacle to motor and lamp.
with OFF-ON switch in OFF position:
Infinity.
With OFF-ON switch in ON
position : Approximately 1.7 ohms. Check
continuity of all wires in power cable
28
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