Canon M111021 ユーザーズマニュアル

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Cleaning the Scanning Glass and Rollers
If stripes appear on scanned images or if dirt appears on scanned 
documents, clean the scanning glass and rollers. Clean the scanning 
glass and rollers regularly.
1
Remove the Top Cover.
2
Pull the Open Button, and pull the Front Maintenance 
Cover open to the right and left.
IMPORTANT
If you notice paper dust in the feed path when you open the 
Maintenance Cover, clean it out with a cotton swab.
3
Press the Open Button, and push the Back Maintenance 
Cover open to the back.
4
Remove the Roller Cover.