TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM9-2350-311 -20-1 3-3 TROUBLESHOOTING CHART — CONTINUED af. VENTILATED FACE PIECE SYSTEM CIRCUIT — (1) NBC INDICATOR LIGHT FAILS TO OPERATE; NBC CONTINUED HEATERS AND PURIFIER OPERATE I INITIAL SETUP I Tools General mechanic’s tool kit (item 64, Appx H) Multimeter (item 36, Appx H) TA-1 probe kit (item 43, Appx H) A 1. Remove LED from NBC indicator light assembly. 2. Place red lead of multimeter in center socket and black lead to ground. 3. Turn MASTER and NBC switches ON and check for voltage. 4. Turn MASTER and NBC switches OFF. Is voltage present? I Replace LED (para 8-17). CONTINUED ON NEXT PAGE 3-344