Canon PIXMA MG4200 Series On-Screen Manual page 154

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C155
Cleaning the Protrusions inside the Machine
Important
Be sure to turn off the power and disconnect the power plug before cleaning the machine.
You need to prepare: cotton swab
If the protrusions inside the machine are stained, wipe off any ink from the protrusions using a cotton swab
or the like.
> Maintenance > Cleaning the Machine > Cleaning the Protrusions inside
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