C12, TM 9-2350-230-12
TABLE 8-4. TROUBLESHOOTING - CONTINUED
Malfunction
Probable cause
Corrective action
M81/EI GUN-LAUNCHER-
Continued
122. Insufficient current
d.
Defective 120 v power supply.
d. Replace 120v power supply
available at firing
(fig. 10-16. 1).
probe to fire weapon-
Continued
e.
IN battery limit switch
e.
Replace IN battery limit
defective
switch.
f. Recoil mechanism safe-to-
f. Notify support maintenance.
fire switch defective.
g. Defective firing circuit relay
g.
Replace relay box (ig.
box
CAUTION:
A short circuit in firing probe or harness may damage K-1 relay in loader's
control box. Notify support maintenance if malfunction still occurs.
123. Breech mechanism
a.
Defective handcrank assem-
a.
Notify support maintenance.
fails to open or
bly.
close manually.
b.
Seized breech chamber and/
b.
Notify support maintenance.
or breech mechanism.
124. Breech mechanism
a. Breech drive solenoid
a. Replace spring, plunger,
binds in manual
plunger jammed in locked
or solenoid, if damaged.
operation
power position.
b. Dirt or foreign material
b. Clean breech chamber and
on breech chamber
exposed surface of
surfaces and/or spindle
spindle assembly and
assembly
apply light coating of
lubricating oil
125. Breech mechanism
a.
Defective electrical wiring
(FSN 9150-949-0323)
fails to operate
harness.
electrically
a. Check continuity between
electric drive motor
plug (P101), solenoid
plug (P103), and limit
switch plugs (P105 and
P106) with large input
power receptacle. Re-
place harness if defective
b.
Defective electric drive
(fig. 11-12).
motor.
b.
Replace motor (fig. 11-14).
8-40
