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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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...

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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

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my brother mfc-7840w printer keeps telling saying there is a drum error and will not print. i clean the corona wire and reset everything yet the same thing happens again and again. how do i fix this?


The drum is the photosensitive roller that the image is charged onto so I'm afraid cleaning the corona wire won't help. If the drum is removeable try reseating it, otherwise it looks like you may need to buy a new drum kit for it.

Apr 28, 2010 | Brother MFC 7840W Printer

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