Canon IMAGE FORMULA DR-9050C - Manual (Page 53)

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Main
ten
a
nce
2. Grasp the roller cover with your fingers, and pull it up
to remove it.
3. Push the roller lock lever up (a) and move it to the left
(b) to unlock the roller.
4. Remove the retard roller.
5. Set the retard roller into place in the scanner.
6. Align the notches in the roller with the shaft pins in the
scanner, then slide the roller lock lever in the
direction indicated by the arrow.
7. Pull the roller lock lever down to lock the retard roller
in place.