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 ARMY
TM 9-6650-235-13&P
MARINE CORPS
TM-08552A-13&P
Table 5-2. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
LENSES
1. DISTORTED IMAGE IS SEEN THROUGH M3
BORESCOPE.
Step 1. Check focus of the eyepiece
assembly (1).
Focus eyepiece assembly
as necessary by loosening
thumbscrew (2) and turning
eyepiece assembly (1)
clockwise or counterclock-
wise for a clear image.
Step 2. Check assembled borescope for
proper number of objective tube
and borescope extension tube
sections.
The minimum quantity of tubes
that may be used are the two
sections of the objective tube
assembly. When borescope
extension tubes are used, each
borescope extension tube
consists of two sections and
both sections must be used
together. These sections
must also be assembled in
the proper order since the
lenses are positioned differ-
ently in the forward and rear
sections.
Step 3. Check lenses in the components of
the M3 Borescope for damage due
to heat, moisture, or cracks. Heat
damage will cause discoloration of
lenses and separation of bonded
lenses. Moisture will cause
fogging and possible fungus growth
on lenses.
Replace any damaged lenses
authorized at direct support
maintenance.
Step 4. Check for proper sequence of
lenses.
Locate lenses in proper
sequence (page 5-11).
5-4
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