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How to reset the Brother DR350 Drum unit whenever you add a new toner cartridge? For a MFC 7420 machine.

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According to the Service manual, when you install the new toner cartridge the drum unit is supposed to be reset automatically. If you go to the following page:

http://www.eserviceinfo.com/index.php?what=search

In the box beside the word Enter type in Brother MFC-7420, and then press the Search button. Once the search is complete you will see a listing like the one I will attach to the end of this note. You need to download all three parts of the file, then unpack the file with whatever program you have to work with RAR files. You will end up with the complete Service Manual for your printer. Page 3-13 of the manual explains what is supposed to take place when you insert your new toner cartridge. Page 9-25 explains what you can do to try and resolve the issue of the new toner not resetting the counter. You can then decide whether you want to try and repair it yourself or have a tech look at it for you.

Here is the image of what the three files will look like after your search:

How to reset the Brother - 599c6df.jpg

Posted on May 11, 2010

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Brother MFC-7420 printing light after installing new cartridge


It could be an issue with the drum unit either being faulty or the internal drum counter having been reset sometime after a new drum was installed. I would recommend removing the currently installed drum unit and trying it in the second printer you mentioned with the toner cartridges that has been confirmed as working.

If the problem persists it is likely to be a froblem with a fuser or another internal part that is not traditionally a consumable item. In which case I would recommend contacting Brother or a printer technician.

Sep 13, 2012 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

My all-in-one printer keeps telling me that I need to change the drum soon. I bought a new drum inserted it into the printer and now I can't print anything. Plus, it is still telling me that I need to...


This message would continue to appear if the drum counter was not reset when you replaced the drum. To reset the drum counter, follow the instructions listed below.

  1. Open the front cover.
  2. Press the Options key on the control panel.
    The display will show "REPLACE DRUM - 1.YES 2.NO".
  3. Press 1 to reset the drum count.
  4. Close the front cover.
Note
    Brother strongly recommends that customers do not use generic drum units and/or toner cartridges, or refill their Brother toner cartridge. Each Brother laser printer is designed to work at pre-set temperatures that are matched exactly to each of our individual toner formulations. Each individual component is designed to work with the other to ensure quality and reliability. Using non-Brother supplies may affect the hardware performance, print quality and machine reliability. The Brother limited warranty does not apply to any problem that is caused by the use of unauthorized third party drum units, toner cartridges or toner.
    If you are using a genuine Brother drum and toner and after following this procedure the unit continues to show "CHANGE DRUM SOON", your machine may require service. Please contact the Customer Service Center.

May 01, 2010 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Installed new cartridge and comming up machine won't regognise it saying tonner life end install new cartridge


To reset the sensor after installing a new toner cartridge follow these steps. 1. With unit powered On, open the front cover. 2. Press the “Options” key. Display will show “Replace Drum?” 3. Press “Start” key. 4. Press 1,0 . 5. Display will show “Accepted” for approximately 2 seconds. Then display will change to “Cover Open”. 6. Close cover and see if Toner Life End error message has gone.
Try this. We are Brother authorized.

Apr 15, 2010 | Brother MFC-7420 Laser Printer

1 Answer

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.

Jan 05, 2010 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

When printing with my Brother MFC, the pages are dark.


Did you change the toner cartridge with a new genuine oem cartridge?
Do a report print <settings> page from the menu and check the 'Drum life' Bar graph. If close to, or at 0%, get a new Drum unit

Dec 09, 2009 | Brother MFC 7420 All-In-One Laser Printer

2 Answers

Printer ghosting(?) after replacing toner cartridge/drum assembly


helo braxtol! tell me, are you using brother oem toner and drum or are you using a generic brand. you could also have a bad power supply. this is what charges the drum and toner. good luck brother tech

Jan 31, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Toner life ends


There are two units in the machine, a toner cartridge and a drum unit. The toner clips into the drum and then is inserted in the machine. If you changed the toner and you still get this message, you may have a bad or damaged toner detection sensor.

Jun 30, 2008 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Brother Printer won't accept mostly full toner cartridge


On the side of the cartridge (TN2000) there is a white reset flag, this need to set to twevle 'o' clock, thats towards the black roller. If that hasn't been reset the cartridge will register as low.

Jun 11, 2008 | Brother MFC 7420 All-In-One Laser Printer

5 Answers

Refill toner Brother MFC 7420


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

May 22, 2008 | Brother MFC 7420 All-In-One Laser Printer

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