—- TM    5-5420-226-20-1 DETAILED TROUBLESHOOTING PROCEDURE Symptom-72 SUPPORT SYSTEM -   PERISCOPES OPERATOR’S IR   PERISCOPE WILL NOT WORK c ~ ~A~~,NG — The    IR   powerpack is  a   high   voltage item.    Injury    to   personnel or   damage to   M24   IR   periscope could occur if MASTER BATTERY and NIGHT Vl- SION   switches are   ON   when    IR  peri- scope power cable is being connected to,  or  disconnected from, IR  periscope. Be  sure   to  set   MASTER BATTERY and   NIGHT   VISION    switch- es OFF before connecting or disconnecting cable. .p 9$K .,, ,.,, ,, NIGH: MASTER CONTROL PANEL VISION SWITCH FOR   CLARITY QUANDRANT v ASSEMBLIES NOT    SHOWN . r^{--   -.CAUTI(JN.} - --- I Perform M24    IR   periscope night    vi- sion   viewer checks during    darkness I only.   Do  not   expose IR  periscope to I POWER PACKS UNDER FLOOR AT I direct sunlight. !   COMMANDER’S STATION . 1 I ___ ; LT________J I NOTE This procedure   is to  be performed   by two persons. The lead person is referred   to  as  the  first   technician and shall  direct    the  activity of  the  second person    called    the   second technician. D Check   front   accessories harness    connector (CKT   516) ~ at   IR   powerpack for   electrical power. ~ Second Technician (Operator’s Station) l Set   MASTER BAITERY switch OFF. l Set   NIGHT VISION switch OFF. s m M24   lNFRAR~D (lR~PERISCOPE TA10737O 4-681 I