SECTION V: TROUBLESHOOTING
TM 9-2350-256-20
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.
G
Remove screw securing ground wire. Check ground
wire for continuity by placing red lead of multimeter in
socket G and black lead on ground wire terminal. If
continuity is present, go to step H. If continuity is not
present, repair/replace ground wire of smoke grenade
launcher system wiring harness (see paragraph 6-91).
H
Reconnect ground wire. Place jumper wires from pin G
to socket G and from pin C to socket C. Place red lead
of multimeter on pin B and black lead to ground. Turn
MASTER and ARM SMOKE switches ON, push RIGHT
switch, and check for voltage. Turn MASTER and ARM
SMOKE switches OFF. If voltage is present, go to step
I for right dischargers, and step K for left dischargers. If
voltage is not present, replace FIRE SMOKE box
assembly (refer to TM 3-1040-266-20&P).
CAUTION
The following steps apply to both the LEFT
and RIGHT dischargers. The LEFT and
RIGHT firing buttons fire three grenades
from each side at the same time. Failure to
do all the steps could leave inoperative
firing on some tubes.
I
Reconnect smoke grenade launcher system wiring
harness to FIRE SMOKE box assembly. Disconnect
cable assembly for M239 smoke grenade launcher, right
hand side discharger feed through from grenade
launcher assembly. Place red lead of multimeter in
socket C and black lead to ground. Turn MASTER and
ARM SMOKE switches ON push RIGHT switch, and
check for voltage. Turn MASTER and ARM SMOKE
switches OFF. Check ground circuit for continuity by
placing red lead of multimeter in socket B and black
lead to ground. If voltage and continuity are present in
all circuits, notify Direct Support Maintenance. If
voltage or continuity is not present in any circuit,
repair/replace harness cable assembly for M239 smoke
grenade launcher right hand side discharger feed
through, (see paragraph 6-104).
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