Tip & How-To about Brother MFC 7840W Printer

How to extend the life of a TN-330 drum kit for MFC-7840W Wireless Printer

If you have received any of the following messages on your Brother MFC-7840W wireless multifunction printer while utilizing the TN-330 drum kit then you may not have to replace your drum, at least not yet.

Drum End Soon
Drum Error
Toner Life End
Toner Low

I had this issue happen to me about 150 pages ago (some text, some pictures) and I still haven't replaced my drum after I executed this little trick.

Take your drum kit out of your printer (make sure you turn off and unplug any cables first)

Take some black electrical tape and cut a inch by inch square off.

Place the black tape over the optical port as shown in the picture below.

Then put the drum back into the printer, cable everything back up and turn the power on.

Your drum should last a long time beyond what was supposed to be a low toner.

Hopes this saves you some money.

Posted by on

Brother MFC 7840W Printer Logo

Related Questions:

1 Answer

How do you reset counter on Toner for TN-360

No, If you use a refill in your recent toner cartridge you need to reset the toner, if you use a new toner cartridge, no need to reset.

Aug 28, 2014 | Brother MFC 7840W Printer

1 Answer

mfc 7840w wireless printer through bell router

How do I connect a Brother MFC 7840W printer to a Bell Network. Every time I try to connect, I get a connection NG message on the printer. Any help would be greatly appreciated

Nov 14, 2012 | Brother MFC-8870dw Wireless Multifunction...

1 Answer

i have an mfc 7840w brother printer and changed the drum unit and I am still getting a drum error message

Maybe you left part of the seal or a piece of tape on the toner unit. The actual drum should look green, and it should be perfectly smooth (no dents)

Jul 05, 2012 | Brother MFC 7840W Printer

1 Answer

My brother printer say Drum Error, so we replaced the drum. Same message. No incoming faxes are working and we have stored faxes we cannot receive.

Try cleaning the corona wire on the drum. It looks like a blue tab along the top of the drum. It may be necessary to reboot the printer also. You will likely lose those stored faxes but might be needed to reset the system.

Feb 28, 2011 | Brother MFC 7840W Printer

Not finding what you are looking for?

3,986 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Brother Office Equipment & Supplies Experts

James Cagle
James Cagle

Level 2 Expert

478 Answers


Level 3 Expert

379 Answers


Level 3 Expert

838 Answers

Are you a Brother Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions