When the drum unit on the HL-L2390DW reaches the end of its useful life, an error message will appear on your printer's LCD. How will I know if it's time to replace the drum unit on my Brother HL-L2390DW? Insert the new toner cartridge and drum unit assembly back into the printer.Push the new toner cartridge firmly into the drum unit until it clicks into place.
Unbox the new cartridge and remove it from the packaging.Push down the green lock lever and take the toner cartridge out of the drum unit.Pull the toner cartridge and drum unit assembly out of the printer.Turn on the HL-L2390DW and then open the front cover.Here's how to replace the toner cartridge on the Brother HL-L2390DW:
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