3.
Push down the lock lever (1) and take the toner cartridge out of the
drum unit (2).
4.
Unpack the new drum unit and put the toner cartridge firmly into the
new drum unit until you hear it lock into place. If you put the
cartridge in correctly, the lock lever on the drum unit will lift
automatically.
5.
Put the drum unit and toner cartridge assembly back into the
machine. Do not close the top cover yet.
