I changed the CIS unit. I turned the copier on and everything seemed to start up then I noticed no display.
When changing the CIS unit. I turned off the power switch, but did not turn off main power switch or un plug the machine.
I then removed the operation panel unit and installed it to another MX-M550n and the panel unit worked fine. I then installed the panel unit from the MX-M550 into the MX-M700n and I again got no display. So these tests eliminate the operation panel unit as the problem.(i hope) now do i go straight to the MFP controller PWB. and/or mother PWB. any ideas?
thanks,
In-the_dark.
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