Canon IMAGE FORMULA DR-7550C Reference Manual page 51

2.
Open the roller cover.
3.
Pull the roller lock lever down.
4.
Slide the feed roller to the right, and then pull them
towards you.
5.
Remove the feed roller.
6.
Place the new feed roller on the pin.
7.
Put the feed roller in place (a), and align the notch in
the roller's axle with the shaft on the scanner (b).
3
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