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Quadrants
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Electronic Cavity
TM   750-116 d.  Quadrant,  M17,  (fig.  3-39). NOTE While purging the quadrant, ensure the pressure relief valve is working by checking for nitrogen gas escaping from the valve. Figure  3-39  M17  and  M18  Quadrants (1) Perform  purging  and  charging  procedure  para 2-5.a. (2) Purge instrument at 7 psig for 5 minutes. (3) Turn pressure regulator off (CCW) and note when relief valve closes. (4) If relief valve closes before reaching 1 psig, re- move hose assembly and depress valve core until all pres- sure  has  escaped. (5) Charge  instrument  at  1  psig  for  60  seconds. (6) Leak test for a minimum of 5 minutes. e.  Quadrant,  M18  (fig.  3-39).  Refer  to  para 3-11. d.  for   procedures. 3-12.    RANGEFINDERS. a. Laser. (1) Optical Cavity (fig. 3-40). NOTE See appendix C for Service Kit containing re- placement parts for M1 and M1A1 Tanks. Figure  3-40  Laser  Rangefinder  Optical  Cavity (a) Remove cover and check lens for cracks and breaks. If damage is evident, do not attempt purging and charging  procedure. (b) (c) (d) (e) (f) (g) (h) (i) Perform purging procedure para  2-5.c. Remove inlet plug and preformed packing. Install valve extension on inlet port. Attach hose assembly to valve extension. Loosen, but do not remove sealing screw. Purge instrument at 5 psig for 5 minutes. While purging, leak test lens area. Remove hose assembly and valve extension from inlet port. (j) Reassemble  by  tightening  sealing  screw  and  in- stalling cover. (k) Install  inlet  port  cap.  Install  inlet  plug  with  pre- formed packing attached and outlet screw with preformed packing  attached. 3-18

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