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Page Title:
Table 5-2. TROUBLESHOOTING (CONT) |
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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
NOTE
The electric light control knob is
used for 115-volt operation only.
The 24-volt operation of the M3 Bore-
scope bypasses the electric light
control.
3. LAMP IN ILLUMINATING HEAD ASSEMBLY OR BI,IND
ILLUMINATING HEAD ASSEMBLY IS TOO BRIGHT OR
TOO DIM.
Step 1.
For 115-volt operation, rotate electric
light control knob (10) clockwise or
counterclockwise.
Replace the electric light
control (pages 5-78 and 5-97)
if lamp intensity cannot be
controlled.
Step 2.
On later model borescopes, check that the
115-V/24-V toggle switch (11) is in the
correct position for applied voltage.
Place 115-V/24-V toggle switch
in the proper position for
applied voltage.
Step 3.
For 24-volt operation, check that the proper
lamp is installed in the illuminating head
assembly or blind illuminating head assembly
and that there are no loose connections in
the adapter tube assembly, objective tube
assembly, or borescope extension tubes.
Replace lamp or repair defective
assembly.
4. 24-V LAMP ILLUMIINATES, BUT 115-V LAMP
DOES NOT.
Reset circuit breaker (6) on adapter tube
assembly (7).
If lamp does not illuminate,
repair the adapter tube assembly
(7).
5-7
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