TM 9-1240-400-34&P
VISUAL INSPECTION
1
Check that all screws are present.
2
Check that mounting surface (1) is clean and
free of nicks and burrs.
3
Check that M139 elbow telescope (2) is free of
dirt and foreign matter, that all parts are present,
and that paint is not chipped.
4
Look through eyepiece assembly (3) and check
that there is no dirt or moisture on lenses (4) and
reticle assembly (5).
5
Look through optical instrument cell assembly
(6) and check that no dirt or moisture is present
on lens (7) or optical instrument prism (8).
EYEPIECE ASSEMBLY FOCUS INSPECTION AND ADJUSTMENT
1
Position M139 elbow telescope on flat surface.
2
Focus dioptometer eyepiece (1) until reticle is
sharp.
3
Set dioptometer range scale (2) at minus 0.75 to
minus 1.0.
3-19
