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The drum unit is attached to the toner cartridge for the DCP-7020. If you open the front cover (flips down) of the printer, you need to simply pull the drum and toner unit straight out from the printer. You should place the unit on a large drop cloth or piece of paper to ensure that the toner doesn't spill. See chapter 6, page 12 (page 52) of the User's manual for the image of the drum unit. Page 6-19 has the removal procedure. You separate the toner unit from the drum by pressing and holding a lever on the left side of the unit. Then pull the toner cartridge straight out from the drum unit. The User's manual is available from Brother's product support page. The direct link to the manual is http://download.brother.com/welcome/doc000367/DCP-7020_UsaEngUsr_B.pdf .
You need to reset after a new drum, open the front door and press menu or options and it will ask if it's a new drum. after that if you still have the error, you may need a new power supply PCB.
All you need to do is open the front door and press either the options button or menu button, whichever you have, it will ask you if you changed drum, just answer yes, and you're good to go...
"Drum error" is because there is dust or any thing like ink on the drum. After I filled the toner with a other brand dry ink, I got this message. I carefully checked the drum, I found there was some ink on the drum. So took off the toner part, washed the drum kit with the tap water. wait it dry. There is a rubber roller inside, it will take time to dry. after the drum kit dry, I rolled the drum, there still something on the drum, I use a tissue paper cleared it. put the toner back, insert it back to the printer. It is fixed.
The printers have a counter chip on the drum which tell you to change it (good or worn) at certain page counts. (that how they make money). Ofter you can chance the counter chip if you have the savvy. These can be found on ebay for about $6 or even cheap replacement drums and toners can be found there.
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