TM 9-1240-400-34&P
4-11.
FINAL INSPECTION INSTRUCTION (CONT)
TELESCOPE LOCKING CLAMP
Position bushing adapter (figure 5, appx D), or elbow
telescope M139 (1), in telescope mount socket (2) and
close telescope locking clamp (3). Bushing adapter, or
elbow telescope (1) should lock securely when locked in
place with telescope locking clamp (3) and eyebolt
assembly (4).
INSTRUMENT LIGHT
1
Inspect instrument light (1) for defective wiring or
damaged parts.
2
Test illumination in a darkened area using 24-volt
d.c. power supply.
3
Connect instrument light (1) to elbow telescope (2).
4
Turn variable resistor knob (3), to maximum and
minimum point, for light intensity variation.
5
LED should provide adequate illumination for easy
legibility of the elbow telescope reticle.
6
Remove M138 telescope mount (4) from surface
plate.
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