Canon AM1 Service Manual page 40

5. Tighten the Fixation Screws.
NOTE:
If you move the Adjustment Plate, it may cause the difference in level of the cassettes.
If you are concerned with the difference in level of the cassettes, adjust it by loosening the 2 screws on the side.
6. Pull out the next upper cassette, and check that the Adjustment Plate is correctly pushed against the frame.
CAUTION:
If the Adjustment Plate is not correctly pushed against the frame, image cannot be correctly adjusted.
When checking Cassette 3, the Between-cassette Cover needs to be removed.
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Adjustment