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TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download

Page 202 of 828

TM 9–2350–311–20–2 3–90 Change 2 3–3 TROUBLESHOOTING — CONTINUED h. CAB LIGHTING SYSTEM — CONTINUED (1) ONE OR MORE DOME LIGHTS ARE OUT, BUT SIGHTING EQUIPMENT LIGHTS OPER- ATE. — CONTINUED 1. Turn MASTER switch to OFF. 2. Remove incandescent lamp from failed socket assembly. 3. Place red multimeter lead on contact in center of socket and black lead to ground. 4. Turn MASTER switch to ON. 5. Turn dome light switch to the position of the failed socket assembly. 6. Check for voltage. Is battery voltage present? 1. Turn MASTER switch to OFF. 2. Reconnect wire 138 to dome light assembly if disconnected. 3. Remove cover from faulty dome light assembly (para 8–11). 4. Turn MASTER switch to ON. NOTE Dome light assembly switch must be placed in position B for blue (blackout) light output terminal “R”, then position C for white light output terminal “W”. 5. Place red multimeter lead to dome light assembly switch output terminals (R, then W) and black lead to ground. 6. Check for voltage. Is battery voltage present in both positions? yes no C CONTINUED FROM STEP A OR B Replace dome light assembly switch (para 8–11 ). END OF TASK yes no D Repair or replace dome light assembly (para 8–11). Replace incandescent lamp (para 8–11 ). OUTPUT TERMINALS R AND W + – DOME LIGHT ASSEMBLY SWITCH