Question about Brother MFC-9420CN All-In-One Laser Printer
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.
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. firstname.lastname@example.org.
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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Posted on Jan 02, 2017
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