Sharp MX-M623U - Manual (Page 42)

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MAINTENANCE
REPLACING THE TONER CARTRIDGES
Be sure to replace the toner cartridge when the message "Change the toner cartridge." appears.
In copy mode
OK
Change the toner cartridge.
Ready to scan for copy.
(Change the toner cartridge.)
Ready to scan for copy.
(Toner supply is low.)
If you continue to use the machine without replacing
the cartridge, the following message will appear
when the toner runs out.
When the message appears in the message display,
replace the toner cartridge.