TM 9-1240-400-34&P
IMAGE TILT ADJUSTMENT
1
Suspend plumbline in front of projector collimator (1).
2
Install dioptometer (2) in telescope holder (3) and adjust so dioptometer faces eyeshield (4).
3
Install a parallax shield on eyeshield (4).
4
Sight through dioptometer (2), directly on to plumbline and revolve dioptometer, in telescope holder (3), until
vertical line is superimposed on plumbline and secure telescope holder.
5
Position dioptometer (2) directly in front of eyeshield (4).
6
Image of vertical line must be within 1 degree (17.78 mils) as seen through dioptometer (2) and as measured on
test reticle projector collimator (1).
7
If required measurement cannot be met, remove
four screws (5), four lockwashers (6), access
cover (7), and gasket (8) to gain access to optic
cell assembly (9).
8
Remove setscrew (10) from plug hole next to
access cover (8) to gain access to three
setscrews (11).
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