Canon CLC5151 Reference Manual page 376

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Replacing the Toner Cartridge
Push the new toner cartridge in as far as possible.
Support the new toner cartridge with your hand from underneath while pushing it into the
machine with your other hand.
IMPORTANT
When replacing toner cartridges, make sure that the colour of the toner cartridge matches the
colour of the toner supply port. If the colour is different, the toner cartridge will not fit into the port.
Return the blue lever on the toner supply port to its original position.
Toner Supply Port