TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 449 of 1275
TM 9-2350-311 -20-1 (5) AIR PURIFIER, DRIVER’S AND CANNONEER NO. 2 NBC HEATERS FAIL TO OPERATE T OO I S General mechanic’s tool kit (item 64, Appx H) Multimeter (item 36, Appx H) TA-1 probe kit (item 43, Appx H) A 1. Disconnect lead 439 from NBC switch. 2. Place red lead of multimeter on NBC switch 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 I Repair or replace lead 439 of ventilated I I I face piece system power harness I (para 8-62). 1 B 1. Reconnect lead 439 to NBC switch. 2. Disconnect lead 438 from NBC switch. 3. Place red lead of multimeter in lead 438 and black lead to ground. 4. Turn MASTER switch ON and check for voltage. 5. Turn MASTER switch OFF. Is voltage present? I I 1 Replace NBC switch (para 8-17). 1 CONTINUED ON NEXT PAGE 3-349