Question about Brother MFC 420CN All-In-One InkJet Printer

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Won't turn on

Can the mother board be broken? Machine won't turn on.

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  • Anonymous Aug 01, 2008

    no leds no power??

  • Newbee01 Aug 11, 2008

    I have the same problem, my led screen went and then when I unplugged it and plugged it back in the power just won't come on tried different outlets but with no success! Any assistance would be greatly appreciated.

  • georgie6011 Apr 13, 2009

    doesn't work!! mine won't turn on wither, for no reason!!! i just bought it!!


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Had the same problem with my 420 CN. The only way I got it to work again was to unplug from power bar and plug directly into wall. Machine powered 4 seconds after I plugged it in. I hope it works for you too.

Posted on Jan 11, 2009

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Posted on Jan 02, 2017

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This is a PCU PCB Communication error. 9 times out of ten it will reset by simply switching the machine off and then on again. If the problem persists here is the section from the manual that describes the possible causes and remedies.

MFP - PCU PWB communication error
Trouble content
PCU PWB connector connection trouble. PCU PWB - MFP PWB connection trouble. PCU PWB trouble.
MFP PWB trouble.
Mother board trouble.
Check & Remedy
Check connection of the PCU PWB, the MFP PWB, and the mother board.
Check the ground.
Replace the PCU PWB.
Replace the MFP PWB. Replace the mother board.
I hope this helps

Good Luck

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1 Answer

Lcd light has gone on MCF 210C Brother machine,

Possible failure of the power supply unit or the LCD unit of the printer. You will need to remove the power supply and check the voltage feed to the mother board and the sub panel LCD unit.
If there is supply to the unit then the LCD panel is faulty, if not the mother board has errors as it fails to communicate to the panel.

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1 Answer

Co500 code

check the thermistor; clean or change ; 2nd check fuse and thermostat using the tester';; 3 check the lock beside of the machine ,, 4 check the halogen lamp of the fixing unit',,5 check the board at the back of the machine;; i mean not mother board;; back of the mother board,, its a rectangular shape board';; if you do that, the machine will function correctly.

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1 Answer

Machine display Full memory messege. Idone what

On this fax machine if you tried everything and still no luck, you might want to try to reset the main board.
This will reset the main board to factory settings.
When you do this, you may need to enter all your information back in again, speed dials, date, time, ect....
On this type of problem, sometimes this works, sometimes the problem maybe more indepth such as, replacing the main board on the machine. I am talking about the large mother board.
Hold down these buttons at the same time... Menu, 1, 3 and * button.
While holding these buttons, use the left hand to power on the machine, while holding these buttons for about 15 seconds...
When you let go of them, the machine should come back on to a normal screen.
There can be other changes in the memorywhen you reset the main board information.
If the machine does not come back on to a normal messege screen, you may need to replace the mother board.
Good luck.

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....have you check the hard disk and the memory ?...check if it functionally normal...

Jan 30, 2009 | Office Equipment & Supplies

1 Answer


Hi there. I think the model is a Canon iR2016. If yes the problem is that the machine is not loading the firmware. The best solution is to get a new mother board for the machine. Just make sure you have the newer version of maotherboards. Having a different connector for the ROM board.

Jan 23, 2009 | Office Equipment & Supplies

1 Answer

The printer stops during use and will not start back.

Michael Benson called me yesterday afternoon and spoke with me. He walked me through a check of the machine and agreed it is the mother board going out. He was very helpful and gave me several options of what could or needed to be done. I will speak to our mayor regarding this and get back with your company if we decide to buy a refurbished machine.

Michael was very helpful.

Thank you,
Lynn Rowland

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There is a little sensor that goes back to the mother board that says the door is closed. This sensor may be malfunctioning because: the sensor itself is broken, or the mother board in the printer is not receiving the pulse. The wire that goes from the sensor to the mother board may be broken or pinched. You can contact to find out what part you may need.
thanks hope this helps Helen
Also you can look to see if debris is caught in the sensor area. Use a flashlight and dust sensor off.

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1 Answer

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that's on either mother board or system control board..requires a special soldering it under warranty?

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Canon copy machine NP6025. Error E800.

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Dec 11, 2007 | Office Equipment & Supplies

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