I have a Bizhub C450 that won't retain touch screen calibration, and sometimes won't let me calibrate at all. First, the machine pretty much loses touchscreen calibration randomly; always when power cycled, but sometimes just for fun...! Second, the calibration isn't always possible (Accessability-->Touch Panel Adjust) because it doesn't always sense all four calibration points. But... if I power cycle, sometimes it WILL let me calibrate; and when I can, the calibration is always accurate and the touchscreen works fine *until* it just goes away again. I thought it might be the NVRAM; that doesn't explain why the calibration routine doesn't sense all 4 buttons. Also, all counters appear correct, and I have NO error codes. I thought it might be the touch screen cable; I disassembled the operator panel, removed and cleaned the touchpanel flex cable (DeOxit) and made sure it was inserted correctly. No change. I thought it might be the touch screen itself; but if it's bad, why would it suddenly start working when power cycled? I am stumped... Could really use another brain looking at this...
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