Canon mp620 - Manual (Page 602)

again.
If the problem is not resolved after performing cleaning again, the protrusions inside the machine
may be stained. Clean them according to instructions.
Cleaning the Protrusions Inside the Machine
Note
When performing Bottom Plate Cleaning again, be sure to use a new piece of paper.
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Page 602 of 815 pages Cleaning the Inside of the Machine (Bottom Plate Cleaning)