Lexmark 12L0103, Reference

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Installing a toner cartridge
The toner cartridge contains the printer’s supply of toner, the material that
adheres to the paper to create the printed page.
When the toner cartridge is empty,
Replace Toner
appears on the operator
panel display, indicating that it is time to replace the toner cartridge.
NOTE: Enough residual toner remains in the printer at this point
that you can press
Go
and continue printing for a short
while. However, we strongly recommend that you change
the toner cartridge immediately. If you do not, the printer
will stop operating when
Replace Toner To Continue
appears on the display. You will then have to replace the
toner cartridge before you can continue to use the printer.
Although we advise you to shake a new toner cartridge vigorously before
you install it in the printer,
never remove a used cartridge and shake it in
an attempt to extend the life of the cartridge. After removing a used toner
cartridge, we recommend that you only insert a new cartridge in the toner
box.