TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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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. 4-28