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Open the front of the printer by pulling the front panel toward you and down. (where you replace the toner cartridge) Remove the toner cartridge/drum unit assembly by pulling up and toward you. separate the drum unit from the toner cartridge by pressing the green release tab on the side and lifting them apart. place the toner cartridge into the new drum unit replace back in the printer press "clear/back" button and then press "1" to cancel "replace drum" message close the front panel. http://support.brother.com/g/b/faqend.aspx?c=au&lang=en&prod=mfc7340_us_as&faqid=faq00000154_039
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.
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.
You dont say what model it is but in 90% of cases with the brother printer, it is the fault of the toner cartridge. I am presuming that the toner cartridge you put in was a generic brand. On the left hand side of the toner cartridge there is a counter reset lever that needs to be in the correct position to reset the printer. You can either return the toner cartridge and request another or try to reposition the lever & gearing by taking off the left cover.
To get every bit of toner powder out of the cartridge, first remove the
toner unit from the drum assembly. Second, find the little circular
window on the right-side of the toner cartridge. Third, place a piece
of black electrical tape over the clear window, cannot be clear tape.
Fourth, re-install the toner cartridge into the drum assembly. Last,
put the complete unit back into your printer. This worked for me.
The problem with a new toner cartridge that will not signal the printer that it has been changed has to do with a gear positioned wrong on the new or rebuilt cartridge... we had 3 factory brand new toners that would not clear the replace the toner message... I finally found the following link that came from a toner company that sells refills that tells how to reposition the gear to let the machine know a new cartridge has been installed. I did the proceedure on pages 5 & 6 having to reposition the gear and all cartidges then worked flawless... it works.