TM 9-2350-287-20-1I2-19. TROUBLESHOOTING CHART (continued).x.NBC SYSTEM (continued).(2) ONE OR MORE M3 UNITS (ELECTRIC AIRHEATERS) FAIL TO OPERATE. No flow fromM2A2 air purifier unit.Initial Setup:Tools/Test Equipment:Equipment Conditions:l Digital multimeter (DMM) (Item 13, Appendix I)l MASTER switch set to OFF (refer to TMl General mechanic’s tool kit (Item 24,9-2350-287-10).Appendix I)NOTEl Instead of using multimeterfor voltage check, STE/lCEtroubleshooting, INDIVIDUALBATTERY VOLTAGE TEST-TEST89 maybe performed.l Instead of using multi meterfor continuity check, STE/lCEtroubleshooting, TEST 91 maybe performed.l M3 electric air heaters can requireup to 15 minutes of warm-up beforeproducing heat.A. Check hose(s) between M2A2 unit and inop-erative M3 unit(s).Are hoses in good condition?1Repair and replace hoses (para 22-5).Verify problem is solved.B. 1. Disconnect harness 12330296 at input con-nection from defective M3 unit(s).2. Place red lead of multimeter in wire 415 andground black probe.3. Turn MASTER switch and NBC POWERswitch ON (refer to TM 9-2350-287-10).4. Check for 24 ± 3 vdc.Continued on next page2-373
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