Replacing the Toner While Printing Is Possible
If you replace the toner cartridge when the message <Black toner is low. Replacement not yet needed.> or <Replace toner cartridge. (Black)> is displayed, follow the procedure below to erase the displayed message.
1.
Press 
(Settings/Registration).
(Settings/Registration).2.
[Adjustment/Maintenance] → [Maintenance] → [Replace Toner While Printing Is Still Possible].
3.
Press the key for the colour of the replaced toner.
4.
Press [Yes].