Canon IMAGEFORMULA CR-190I - Manual (Page 44)

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B
Press the Open Button, and push the Back Maintenance
Cover open to the back.
C
Wipe the feed path with a firmly wrung cloth, moistened
slightly with water or mild detergent. Then, wipe off with a
clean, dry cloth.
D
Close the Back Maintenance Cover.
E
Close the Front Maintenance Cover in the order shown in the
diagram below.
Feed Path