M239 SMOKE GRENADE LAUNCHER SYSTEM (cont)

M239 SMOKE GRENADE LAUNCHER SYSTEM (cont) - TM-9-2350-256-20_407

M239 SMOKE GRENADE LAUNCHER SYSTEM (cont) - TM-9-2350-256-20_409

TM-9-2350-256-20 Carrier Cargo Tracked 6-Ton M548A1 (2350-01-096-9356) M548A3 2350-01-369-6081 Manual
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CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS TM 9-2350-256-20 2-19 ELECTRICAL TROUBLESHOOTING-Continued M239 SMOKE GRENADE LAUNCHER SYSTEM-Continued WARNING Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts a metal surface a direct short may result in instant heating of tools, damage to equipment, and injury or death to personnel. D Place a jumper wire from pin A to socket A. Place red lead of multimeter on pin B of M239 launcher power switch box and black lead to ground. Turn MASTER and ARM SMOKE switches ON and check for voltage. Place red lead of multimeter on pin D of ARM SMOKE box assembly and black lead to ground and check for voltage. Turn MASTER and ARM SMOKE switches OFF. If voltage is present on both pins, go to step F. If voltage is not present on either pin, go to step E. E Reconnect smoke grenade launcher system wiring harness to M239 launcher power switch box. Remove M239 launcher power switch box from mounting bracket (see paragraph 15-1). Disconnect connector from terminal 2 of ARM SMOKE switch. Place red lead of multimeter on wiring harness and black lead to ground. Turn MASTER switch on and check for voltage. Turn MASTER switch OFF. If voltage is not present, repair/replace wire in power switch box assembly for M239 smoke grenade launcher assembly (see paragraph 6-92). If voltage is present, replace ARM SMOKE switch (see paragraph 15-1). F Reconnect smoke grenade launcher system wiring harness to M239 launcher power switch box. Disconnect smoke grenade launcher system wiring harness from FIRE SMOKE box assembly. Place red lead of multimeter in socket B and black lead to ground. Turn MASTER and ARM SMOKE switches ON and check for voltage. Place red lead of multimeter in socket D and black lead to ground and check for voltage. Turn MASTER and ARM SMOKE switches OFF. If voltage is present in both sockets, go to step G. If voltage is not present in either socket, repair/replace smoke grenade launcher system wiring harness (see paragraph 6-91). 2-340

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