See the section on Replacing the toner cartridge i
n page 10.3 of the manual.
When the toner cartridge is completely empty:
• Toner Empty, Replace Toner1 appears on the display.
• The machine stops printing. Incoming faxes are saved in memory.
At this stage, the toner cartridge needs to be replaced.Check the type of the toner cartridge for your machine. (Page 12.1)
There are many well explained steps in the manual.