CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedM239 SMOKE GRENADE LAUNCHER SYSTEM-ContinuedWARNINGRemove all jewelry such as rings, dog tags,bracelets, etc. If jewelry contacts a metalsurface a direct short may result in instantheating of tools, damage to equipment, andinjury or death to personnel.JReconnect smoke grenade launcher system wiringharness to FIRE SMOKE box assembly. Disconnectcable assembly for M239 smoke grenade launcher, lefthand side discharger feed through from launcherassembly. Place red lead of multimeter in socket A andblack lead to ground. Turn MASTER and ARM SMOKEswitches ON, push LEFT switch, and check for voltage.Turn MASTER and ARM SMOKE switches OFF. Checkground circuit for continuity by placing red lead ofmultimeter in socket B and black lead to ground. Ifvoltage and continuity are present in all circuits, refer toTM 9-1330-200-12. If voltage or continuity is notpresent in any circuit, repair/replace cable assembly forM239 smoke grenade launcher, right hand sidedischarger feed through (see paragraph 6-104).2-342
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