Canon IMAGE FORMULA DR-7550C Reference Manual page 50

5.
Open the roller holder, and insert the new pickup
roller.
IMPORTANT
Install the Pickup Roller so that side with the gear is on the left.
Gear
6.
Close the roller cover. Check that it makes a latching
sound and that it is securely returned to its original
position.
42
IMPORTANT
Failure to firmly close the roller holder and roller cover may
cause a feed error. Always be sure to check that the roller holder
and roller cover are closed.
7.
Gently lower the upper unit (a). Press down on both
sides of the upper unit to ensure that it is securely
closed (b).
■ Removing and Reinstalling the Feed Roller
1.
Press the Open/Close button and carefully raise the
upper unit until it stops.
Open/Close Button