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Xerox 5314 throwing a U8 code

Hi,

I know the U8 code is showing the the optics sensor isn't reading enough light at the main board even though the exposure lamp comes on. I have cleaned the platten and 5 mirrors. In diagnostic mode I can turn on the exposure lamp, and erase lamp. But it still does a U8 code whenever I try to copy. Is it the exposure sensor, and if so where is it located? Or is it possibly the main board? I don't want to throw a lotr of money at it but would like to fix it if possible. Thanks, Dan

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