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 TM 9-1220-220-34
2-2.
PERFORMANCE TEST (CONT)
FRAME 2
Step
Procedure
Symptom
Maintenance Action
1.
Set range correction knob (1)
...
...
on ballistics computer (2)
according to the number of
effective rounds fired (see
log book and decal on cover
(3)).
2.
Pull range correction knob
...
...
(1) out and turn right or
left as required.
3.
Push in and turn
...
...
superelevation hand crank
(4) to the left until
superelevation counter (5)
reads 0 (zero).
4.
Set circuit breaker switch (6)
...
...
to ON.
WARNING
Do not press reset button
(7) on ballistics computer
(2) until all personnel and
equipment are out of the
way of gun. Gun may move
up or down.
5.
Press and release reset
...
...
button (7) on ballistics
computer (2).
6.
Note the reading of outer
...
.
pointer (8) of ballistics
computer (2).
7.
Check that range movement
Range movement is not
Set circuit breaker switch to
(reading of outer pointer
the same
OFF. Place correct number of
(8)) is the same as reading
turns on input shaft Vol II,
on inner pointer (9).
para 44, frame 4, and para 4-5,
frame 9).
GO TO FRAME 3
2-4
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