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ARMY
TM 9-6650-235-13&P
MARINE CORPS
TM-08552A-13&P
Table 5-2. TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM
NOTE
Procedures for the blind illumi-
nating head assembly (5) will be the
same as for the illuminating head
assembly (4).
On later model borescopes ensure that
the 115-V/24-V toggle switch is in the
proper position for the applied voltage.
2. LAMP (3) WILL NOT ILLUMINATE IN
ILLUMINATING HEAD ASSEMBLY (4) OR BLIND
ILLUMINATING HEAD ASSEMBLY (5).
Step 1.
Check for a tripped circuit
breaker (6) on the front of
adapter tube assembly (7).
Reset tripped circuit breaker
(6) by pressing it in. If the
circuit breaker trips again,
disconnect power and using
multimeter, check for short
circuit.
Step 2.
Check lamp (3) in the illuminating
head assembly (4) by removing and
installing a spare lamp.
If lamp (3) lights, discard
defective lamp. If lamp
does not light, install the
blind illuminating head
assembly with the correct
lamps installed for the
supply voltage being used.
If lamps in the blind illumi-
nating assembly light, use a
multimeter to check the
wiring of the illuminating
head assembly for an open
circuit. Check lamps in the
blind illuminating head assembly
(5) in the same manner.
5-5
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