Canon imageclass mf4890dw User Manual

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Cleaning the Platen Glass and Feeder 
If a scanned image has unexpected specks, clean the platen glass and feeder.
Cleaning the Platen Glass
Turn OFF the machine and disconnect all the cables from the machine.
Remove any documents from the platen glass.
Open the feeder.
Clean the platen glass with a soft, dry cloth.
 
Close the feeder.
Reconnect all the cables, and then turn ON the power.
Cleaning the Feeder
Turn OFF the machine and disconnect all the cables from the machine.
Remove any documents from the feeder.
Open the feeder cover, clean the rollers with a well wrung-out cloth 
dampened with water, and then wipe them with a soft and dry cloth.
 
MF4890dw 
MF4880dw/
MF4770n
When cleaning the machine, do not use tissue paper, paper towels, or 
similar materials for cleaning. They can generate static electricity.
Close the feeder cover.
Reconnect all the cables, and then turn ON the power.