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TM 9-1220-220-34
2-2.
PERFORMANCE TEST (CONT)
FRAME 3
Step
Procedure
Symptom
Maintenance Action
1.
Check that ballistic
Oscillation or stalling in
Set circuit breaker switch (2) to
computer (1) does not move
ballistic computer.
OFF. Tell your supervisor.
back and forth more than
ten times or does not stall.
2.
Set circuit breaker switch (2)
...
...
to OFF.
3.
While looking into range
...
...
scale window (3) of range
finder (4), turn range knob
(5) until range scale reads
2000 meters.
4.
Check that inner (range)
...
...
index (6) of ballistic com-
puter (1) reads 2000
meters.
WARNING
Do not set circuit breaker
switch (2) to ON until all
personnel and equipment are
out of the way of gun
movement.
5.
While looking into gunner's
Rough or bouncy
Set circuit breaker switch
periscope (7), set circuit
movement of gunner's
(2) to OFF. Check and
breaker switch to ON. Check
periscope reticle.
reposition ballistics drive
that reticle moves smoothly
(does not jerk or bounce).
step 1 only; then go to para
4-5, frame 2).
GO TO FRAME 4
Para 2-2 Cont Vol I
2-6

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