Question about Brother MFC-9840CDW Laser Printer

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Print error 6a

Wont' reset itself; cleaned, taken apart put back together; replace belt still hasn't fixed that error

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6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 832 Answers

SOURCE: printer still wont work...

You've printed a lot, havent you?


It seems that you have to reset the flush counter, too. The flushing box is the 2nd reason for an error unable to clean. This is the small softbox on the left hand side where the printhead runs acorss for before it starts printing. You dont have to change the flushing box. Its OK to do a reset only:

Call up maintanance modus. press 8 then 0 then several times start mono until FLUSH XXXXXXXXXX (where X are No.) appears. Press the reset code again. After leaving the maintanance mode your mfc should work without a problem.


BTW: What exactly did you do with the waistinktank? I hope you have replaced it by a new one!

In case you have cleaned with water and reinstalled it,  the tank wont take up ink anymore! The ink will flow into the machine and the sensor will give you the error code again (That could be another reason why you still have the error code!)


Please be careful and buy a new one as a sparepart from a service partner who can be found on the brother homepage of your country!

Posted on Oct 12, 2007

  • 832 Answers

SOURCE: Error 46, 5B, and now 38

Did you deformate the pf encoder disc when reassembling the printer? This is the round foil being installed on one of the three wheels on the left side. This might be reason for the scratching sound.
5B happens when there is no ink within the purge unit tubes. It cant do a negative pressure to purge the printhead.

Try to fix the encoder disc and put some ink onto the purge station where normally the print head is in parking position. Afterwards the print engine should work again. Have ink carts placed well. The machine will try to purge the ink and is trying to do a neg. pressure again.

In case you wont be lucky you will have to go shopping to buy a new one...

Posted on Nov 08, 2007

  • 832 Answers

SOURCE: printer trouble

read my answer here:

Posted on Nov 30, 2007

  • 1113 Answers

SOURCE: brother 420

error 51 = The purge cam switch does not come ON or OFF even after the purge cam has been driven by the specified number of pulses.
Fix is
Switching arm assembly not engaged correctly If the switching arm does not move smoothly, clean it.

Ink cartridge/purge switch harness not connected correctly
Correct the connection.

Purge cam switch broken Replace the purge cam switch.

Gear(s) on the maintenance unit broken Replace the maintenance unit.

Paper feed motor broken Replace the paper feed motor.

Main PCB defective. Replace the main PCB.

Cleaning of these print heads rarely if ever is successfull, they are electronic devices unlike other brands of printers

Posted on Dec 04, 2007

  • 150 Answers

SOURCE: error code 6a on a brother dcp-7020 fuser unable

you need a new fuser. Not easy to install for most people I think I have a used one for sale for 40.00 805-520-3003 steven

Posted on Feb 14, 2010

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