TM 9-2350-261-20-11. Turn MASTER SWITCH to ON.2. Turn I.R. switch to ON (See your -10).3. Does I.R. periscope work?1. Replace original I.R. power pack(page 12-134 or 12-137).2. Verify no faults found.1. Remove periscope power circuit 517 lead (1) from I.R.power pack (2).2. Measure resistance between lead ends (1) and (3)(inner and outer).3. Does multimeter read O ohms both times?1. Replace I.R. periscope powerlead.2. Install original I.R. powerpack(page 12-134 or 12-137).3. Verify no faults found.GO TO NEXT PAGEChange 13-113
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