Question about Brother MFC-9420CN All-In-One Laser Printer

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MFC 9420 CN paper tray issue

I came to the defective engine board conclusion as well, and your description of the page count is correct; however, I did not see this anywhere in the Brother Service manual. Any suggestions on where to find a replacement board? I actually found a complete printer for $279.00. I'm going to call my Brother Service center and get a quote on the engine board tomorrow.
Any Idea what conditions cause the board to die? Also thanks for confrming the cure for me.

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  • skiddgp58 Jul 25, 2008

    Where can I get a service manual have exhausted all my sources. Scott

  • Anonymous Feb 19, 2009

    i have already replced the opc belt and fusing roller. I am not spending another 400 to replace this stupid engine controller. The machine is just 2 years old.

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Look in the parts manual for "engine controller board." You can get replacement boards through at least some of the authorized service centers. I got a refurbished board from a good guy in St. Charles, Illinois (Tom). You can contact him by email. tomb@busauto-inc.com.

I'd shy away from buying a complete printer. No guarantee it has an updated board and then you'll be back to where you started.

I'm pretty sure the board dies from a firmware bug that's been dormant until recently. Not sure if the bug is triggered by reaching a certain page count, date, or something else, but if you notice, the reported problems all seem to be emerging within a few months of each other even though the printer was first released more than two years ago. Generally after the warranty expires.

Posted on Apr 04, 2008

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