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Re: Toner replacement on Brothers MFC 7420
Open the front cover and try to pull it out strongly.
then use the duster to clean the machine.
then you should able to replace your cartridge easily next time.
mightbe too dirty or you use ODM toner? if yes that's the problem issued from.
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This is a .pdf file-You will need Adobe Reader to read the manual.
Once you have downloaded a copy of the manual to your pc, Go to Section 11-25 (p. 112) and 11-26 (p. 113) Here you will find detailed step-by-step instructions and illustrations on how to remove the toner cartridge from the drum.
Sounds like a bad drum cartridge. Pull the toner/drum cartridge out of the machine and set it down. Press down on a (blue?) tab to release the toner cartridge, and you can lift the toner cartridge out of the drum cartridge. There is a cleaning blade in there - a soft plastic blade that rides against the drum and scrapes off toner that didn't get transferred to the paper. If it gets stuck off the drum surface, images repeat a few inches (one drum circumference) down the page.
A new DR-350 drum unit should fix it. have the machine's power on when replacing it. While the door is open, touch the CLEAR key. The display will read "REPLACE DRUM?" or something like that. Press 1 for Yes.
The MFC7420 has sensors that sense when the toner is low. It lets you know in time to purchase another cartridge before you totally run out. If you can get one same day I wouldn't purchase one until the printer pages start fading.
Most likely cause is a bad toner cartridge. It's likely dumping excessive toner inside the printer. try taking the toner out and hold it sideways and tap it, if toner falls out then your cartridge is defective. try vacuuming the printer and wipe it clean with a dry cloth and and replace the toner with a new one.
Is this a genuine Brother replacement cartridge, if not you may find that it is not recognised by your MFC. Also worth a try is removing and reinstalling the new cartridge ensuring all protective packaging is removed. Also remove and reinstall the Drum unit as Brother actually recommend this as part of a new toner install
open front cover, press OPTION button, on the LCD will appear a message "NEW DRUM?" ....DO NOT RESPOND....just type on the keyboard "*00" and there will appear a message "Accepted" and use it in your pleasure.
PS. in any case i blocked with paper labels the viewing windows from transparent plastic on the toner itself....
Mr. Brother, do not try to be smarter than your customer