20 Most Recent Brother MFC-9840CDW Laser Printer - Page 2 Questions & Answers

Hello, You must reset the drum counter in order to print again. Here is the method http://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=hl2280dw_us&faqid=faq00002837_000#instruction

What make & model of printer??

The clear/back option is usually reserved for resetting drum page counts. Resetting toner page counts is usually achieved by a flag gear on the left hand side of the cartridge that rotates and tags a micro-switch arm inside the printer when the cartridge is first installed. If the micro switch doesn't register, the cartridge count is not reset although the flag gear has rotated and will not do so again unless manually reset.

Black lines on copy come from toner cartridge, or drum unit, or fuser unit which is in the back. check drum and see if you can see line, back of machine with flash light you may be able to see line on fuser roller. Be carefull Fuser is hot. A copy that is good and then starts to get lines usually the drum unit...

Your toner cartridge may be the culprit. Take the cartridge out and shake sideways and up/down. Reinstall it and try again. If it's still printing faded side, replace the cartridge.

Are you using a reman'ed toner cartridge?

You will want to call a tech or contact Brother if under warranty to replace the fuser assembly. We had this problem in the duplexer built into the fuser assembly, we also had to replace the drum to get things back in order.

remove all associated driver and scanner software reinstall all the software with the scanner and printer disconnected then rebootit all connected. Try again

I just had this problem on my 9840. Turned out it was the density sensor shutter solenoid sticking. Turn off the power and unplug the printer. Remove the drum unit then the Transfer belt unit. Turn the machine around. Remove Fuser unit (2 screws). Remove 2 plastic covers over High voltage (they slide to the left with catches on the right) The solenoid is on right. 1 screw holds it in, carefully lift it up as it has a spring on the plunger. Cover the black rubber bumper with scotch tape. Reinstall making sure the plunger fits into the slot and the spring is behind the slot. Re-install the covers on the high voltage. Reinstall the fuser and transfer belt, then drum unit. You may then go about your business again.

As soon as the printer does not read the chip on the toner cartridge correct, it assumes there is non or an empty one. Make sure all contacts on the cartridge and in the printer are clean and shiny. make sure none of the contacts is bent or has a dent.