Canon MP980 series On-Screen Manual page 712

Cleaning the Inside of the Machine (Bottom Plate Cleaning) Page 712 of 947 pages
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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