ARM620 E7-90 E7-80

[hellcat]

This machine keeps popping up E7-90 and E7-80

I know these are both PCU communication troubles. I have reseated all connectors from PCU to scan board to the MFP board.

The codes clears out for a short time 30 mins to an hour and comes right back each time. It will usually lock up the entire machine (cant press buttons of go into sim). I have flashed machine with no difference in problem. I am guessing replacing pcu board. Any other suggestions out there? Ive worked on tons of these machines and never had this issue on one yet. Thanks for the help.

[skookumchuck]

Any accessories? If there is a fax unit, try unplugging that. Not really specific to that machine but a good general thing to try.

[hellcat]

yes it has a ARFN16 and Fax, Unplugged both to get down to a basic machine pretty much and still no difference

[igi]

Symptom:	E7-90 trouble (The cooling fans turn on and off (twice) before staying off and the display locks up with "hanging logo").
Cause:	Faulty Mother Board - replace.

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