Question about Brother MFC 7420 All-In-One Laser Printer

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Brother MFC 7420N network connection failed

My 7420 was working fine until I got the famous "rear door open" error message after a paper jam. I fixed the jam. But now the router will not communicate with the printer. 
I unplugged the network cable from the printer and plugged it my laptop and the router connection LED immediately lights up confirming a good connection.  I reconnected the network cable to the printer and the LED goes off on the routher and stays off.  A cable diagnostic test using the builtin feature of the router reports that the network cable is not plugged into anything.
I unplugged the cable from the printer and inspected the inside of the network port for bent pins.  Nothing there and if I plug the cable back into my laptop the router reports the cable as fine.
This just seems wierd after a paper jam.
Any suggestions where I can go from here.  Thanks.

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  • puddleboots Jan 15, 2009

    The solution to this problem was that the network cable was in fact defective.  One of the 8 crimps within the RJ45 connector became open when I disturbed it to fix the "open door" error.  For some reason when plugging the defective cable into a laptop there was no connection problem and I suspect it was not using the defective connection where the printer was.  The defect was found using a cable tester and the connector was replaced.  Everything fine now.

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  • 56 Answers

Open the back door.
Pull down the black rear chute the exposes the fuser (opens just like the door)
In the middle you will see a black piece of plastic that is a paper sensor. In the middle of the rod that that piece is on there is a flag that sticks down through a slot. This piece is off and out of position, snap it back in so the flag is through the slot and the rod and pieces rotate freely.

That will FIXYA!

Posted on Jan 15, 2009

  • John Tuminaro
    John Tuminaro Jan 15, 2009

    Great! You should keep the instructions i sent you becuase it is a common issue with this model.

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