Some
Brother laser printers have separate consumables - the toner cartridge
and the drum unit. From time to time you may need to replace only the
drum unit and not the toner cartridge.
The
error LED lights up, or an error message shows on a flat screen panel,
when the drum unit is near the end of its working life. Use the drum
unit until you have a print quality problem, then replace the drum unit
with a new one.
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