Epson DFX8500 PCB's

[The Fixer]

I have been getting a few "dead" units. No error, just on/off
P/S checks out ok {fan spun}
Driver Bd's voltage checks are all correct.
Left I/O bd is correct 5v sys. ok.
New P-head=no change.
Logic a bit harder to test, should I suspect the EEPROM?
{easier to put in!}
Upper assy. is all good.
Looking for a training site for just this unit. Epson is mute, and google only gets sales stuff. Too many on contract to be sending out.

[jtymabel]

check out the interlock for the top clamshell. i have the service manual if you need it...i could not upload it.