TROUBLESHOOTING CHART (continued). - TM-9-2350-287-20-1

(2) ONE OR MORE M3 UNITS (ELECTRIC AIR HEATERS) FAIL TO OPERATE.

TROUBLESHOOTING CHART (continued). - TM-9-2350-287-20-1_427

TM-9-2350-287-20-1 Carrier Ammunition Tracked M992A21 (2350-01-352-3021) EIC:AE6 Manual
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TM 9-2350-287-20-1 2-19. TROUBLESHOOTING CHART (continued). x. NBC SYSTEM (continued). (2) ONE OR MORE M3 UNITS (ELECTRIC AIR HEATERS) FAIL TO OPERATE. No flow from M2A2 air purifier unit (continued). CONTINUED FROM B B. 5. Turn MASTER switch OFF (refer to TM 9- 2350-287-10). I Is voltage present? I 1 Replace M3 electric air heater(s) (para 22- 3). Verify problem is solved. C. NOTE Trace the electrical lead from the defective M3 unit back to the harness connector pin on the NBC control box (J2 connector). Leads are numbered (415D to 415G) for easy identification. 1. Reconnect wire harness 12330296 to input connection of M3 unit(s). 2. Disconnect harness from NBC control box J2 connector. 3. Place red lead of multimeter in sockets A,C,E or F (depending on which M3 unit is defective) of control box power box outlet and ground black probe. 4. Turn MASTER switch and NBC POWER switch ON (refer to TM 9-2350-287-10). 5. Check for 24 ± 3 vdc. 6. Turn MASTER switch and NBC power switch OFF (refer to TM 9-2350-287-10). Is voltage present? Continued on next page 2-374

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