Canon AM1 Service Manual page 39

Adjustment
3. Loosen the Fixation Screw.
1x
4. Move the Adjustment Plate left or right according to the scale [1] value checked in step 2. (As the Adjustment Plate
is moved toward the left of the machine by 1 tooth [2], the left edge margin is increased by 0.5 mm.)
[1]
[2]
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