TM-3-1040-268-20-P
LAUNCHER, GRENADE, SMOKE: SCREENING, RP, M250
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
MAY 1982
TM-3-1040-268-20-P - Page 12 of 72
TM 3-1040-268-20&P
Section Ill. PRINCIPLES OF OPERATION
1-10. M250 LAUNCHER.
a.
Electrical Connections.
The launcher uses the vehicle’s electrical sys-
tem. Electrical receptacle connector on each discharger (fig. 1-1) connects
them to electrical cables in the vehicle.
b.
Loading Dischargers.
Smoke grenades are muzzle-loaded into dis-
charger barrels.
c.
Arming.
Moving a spring-loaded READY/SAFE switch in tank turret to
READY and holding it there closes electrical circuit. A POWER LIGHT, next to
the POWER SWITCH, goes on to warn that launcher is armed for firing.
d.
Firing.
Pressing one of two push switches in turret sends electrical
charge to dischargers. Dischargers are wired to fire grenades from alternate
barrels. Inside each discharger are two resistor assemblies wired to the electri-
cal receptacle connector to reduce current. Each resistor assembly has three
wires connected to jack connectors in three discharger barrels. One resistor is
connected to pin A of the electrical receptacle connector and to barrels 3,4, and
6. The other resistor is connected to pin C and barrels 1,2, and 5. (Aground wire
connects pin B to discharger body.) Pressing one push switch routes current to
three of the jack connectors in each discharger and launches a salvo of six
grenades (three from each discharger). Pressing both switches launches a
salvo of twelve grenades. The charge flows through an electrical contact in
grenade base and fires grenade’s squib fuze.
Figure 1-1. Launcher wiring diagram
1-4
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