Contact Systems CS-400E Optical Correction

Does anyone know how often the optical sensor goes bad on the CS-400E machines. I have 2 machines and it seems that the optical correction does not work anymore. I keep getting an optical correction error, when the mode is turned on the correction does not see the PTH and says to recenter. I was wondering if anyone else out there has had this problem or knowledge of the failure rate of these optical sensors.

Thanks,

Paul

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