Since replacing the main CPU board the Ricoh MPW2400 copier works fine, but loses its touch screen calibration.
It calibrates fine once set, but days later on restart one is back to its incorrect setting.
I see mention elsewhere that this is a function of a bad touch panel, but that makes no sense.
I have written code myself for this functionality....
The cpu calibration routine must save the couple x,y locations, then it does some math to sort out the correct geometry to match what is required.
The data must be saved to NVRAM or somewhere when the power is off to be retained.
Seems to me it isn't doing this as it should.
Either that, or the touch panel despite calibrating, offers x,y positions that are outside the original programmer's self enforced limits, and is discarding them, not saved, despite allowing the touch panel to work exactly correctly.
I swapped the NVRAM battery on CPU board swapping, it should be fine but I haven't gone back and checked it.
Any thoughts on this from those having experienced this?
Thanks much.
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