I have a problem, the toner in the bottle is over, after adding a new one, the whole sheets are covered with a gray background, give too much toner. There is sc29-11 error, with the settings of auto drum potential pops up error 3. I have replaced the drum for another,i changed the image density to lighest, but it is still the same. Is it a fault of a used developer or a potential sensor broken?
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