Canon i-SENSYS MF6140dn User Manual page 919

4
Insert the toner cartridge.
Fit (A) on both sides of the toner cartridge into the guides located on both sides of the machine and slide the toner
cartridge into the machine until the toner cartridge comes to rest and is held against the back of the machine.
5
Close the front cover.
If you cannot close the front cover
Make sure that the toner cartridge is installed correctly. Do not try to forcefully close the toner cover, as this may damage
the machine.
If there are white lines in the print result or it is blurred or distorted even though the above operations have
been performed, replace the toner cartridge with a new one.
"Replacing the Toner
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Cartridge"