Canon LBP-1210 Getting Started Manual page 14

6.
Do not touch the drum's protective shutter.
Caution:
When setting the toner cartridge, do not put your hands too far inside the
printer. Your hands may be pinched if the front cover closes.
7.
Do not leave the front cover open. Exposure to light can damage the
cartridge's drum.
14
Insert the cartridge into the printer along the guides. Make sure that
the cartridge slides all the way inside the printer.
Always close the front cover immediately after inserting a cartridge.
Installing the EP-25 Cartridge