Canon imageCLASS MF266dn II User Manual page 19

Platen glass
Place books, thick paper, thin paper, and other originals that cannot be placed in the feeder on the platen
glass to copy or scan. The placed originals are scanned in a fixed position.
Ventilation slots
Air inside the machine is released through the ventilation slots to cool down the inside of the machine.
Do not place objects next to the ventilation slots, as this can prevent ventilation.
● To ensure efficient use of the machine, regularly clean the surface and platen glass.
Cleaning the Surface of the Machine(P. 521)
Cleaning the Platen Glass(P. 525)
● If the following symptoms occur when using the feeder, clean the feeder:
- Originals become dirty
- Originals frequently jam
- Printouts appear smudged after scanning, copying, or sending faxes
About the Machine
10
Placing Originals(P. 137)
Cleaning the Feeder(P. 526)