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  TM 9-2350-222-20-2-1
3-2.
TURRET CHECKOUT (CONT)
Troubleshooting
Reference
Step
Procedure
Set CUPOLA ELECTRICAL POWER CONTROL
switch to ON and check for the following:
Para 5-3 (without Commander's
a. Commander's periscope M36 daylight reticle
Control Panel installed Para 5-5
light and intensity controlled by light source
(with Commander's Control Panel
control (TM-10).
installed)
Para 5-5
If a Commander's Control Panel is installed,
b.
POWER ON lamp is lit.
c.
Check operation of caliber .50 machine gun
electrical firing circuits and note following:
NOTE
Do steps (1) and (4) on tanks without a Commander's
Control Panel. Do steps (2), (3), and (5) on those tanks
equipped with a Commander's Control Panel.
(1)
Click of gun solenoid is heard when
trigger is pressed (safety switch ON).
GUN READY lamp is lit and click of gun
(2)
solenoid is heard when trigger is pressed
(safety switch ON, LAST ROUND
OVERRIDE switch on).
GUN READY lamp lights when the last
(3)
round sensing switch is pushed down (safety
switch ON. LAST ROUND OVERRIDE
switch OFF).
Remove and replace safety switch
(4)
Click of gun solenoid is not heard when
TM 20-2-3 (para 36-27, 36-28)
trigger is pressed (safety switch OFF).
Click of gun solenoid is not heard when
(5)
trigger is pressed (safety switch OFF, LAST
ROUND OVERRIDE switch on).
Check turret traversing and gun elevation in
2.
manual mode (TM-10) for following:
a. Turret traverses left and right smoothly
without interruption.
b. Perform calibration of Gunner's Quadrant
M1A1 (TM 9-1290-200-14&P).
c. Gun elevates and depresses smoothly without
Para 4-2
interruption. As gun passes zero (while
elevating), gun elevates 10 mils or more in
one revolution of manual elevating handle.
GO TO FRAME 5
Para 3-2 Cont
3-5
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