Canon DR-7090C - Manual (Page 58)

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14. Attach the cleaning paper to the scanning area
cleaning tool.
15. Open the inner cover.
16. Wipe the platen roller located behind the inner cover
with a cloth moistened with plain water and
thoroughly wrung out. Next, wipe the roller with a soft,
dry cloth.
IMPORTANT
When cleaning the platen roller, rotate the roller slowly while
wiping it.
17. Clean the feeder’s scanning area along the rail.
Platen
Roller