TM 9-2350-287-20-1
I
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.
Initial Setup:
Tools/Test Equipment:
Equipment Conditions:
l Digital multimeter (DMM) (Item 13, Appendix I)
l MASTER switch set to OFF (refer to TM
l General mechanics tool kit (Item 24,
9-2350-287-10).
Appendix I)
NOTE
l Instead of using multimeter
for voltage check, STE/lCE
troubleshooting, INDIVIDUAL
BATTERY VOLTAGE TEST-TEST
89 maybe performed.
l Instead of using multi meter
for continuity check, STE/lCE
troubleshooting, TEST 91 may
be performed.
l M3 electric air heaters can require
up to 15 minutes of warm-up before
producing heat.
A. Check hose(s) between M2A2 unit and inop-
erative M3 unit(s).
Are hoses in good condition?
1
Repair 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 and
ground black probe.
3. Turn MASTER switch and NBC POWER
switch ON (refer to TM 9-2350-287-10).
4. Check for 24 ± 3 vdc.
Continued on next page
2-373