How can I color print with MFC 7420 printer? - Brother MFC-7420 Printer

SOURCE: mfc-7420 Black Line horizontal across paper in 3 places

try moving the small blue slider on top of the drum cartridge side to side 10 times.

SOURCE: Brother MFC-7420 just started printing a shadow image

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.

Clive

• 4362 Answers
• Posted on Jan 30, 2010

SOURCE: brother mfc-7420 - unable to print

OK Try
Solution:

• Machine off
• Switch on the machine while holding down the “menu”button until all the leds are flashing on/off. Now you are in “maintenance” mode.
• Press 80
• Press the “mono start” button several times until you see “purge: xxxx”
• Press “2783” in order to reset the purge counter. You will see: “purge:0000”
• Press the "stop" button.
• Press “99” to exit the maintenance mode.