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.

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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)

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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.

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