Hmm, I've never had a laser issue with that series and I still have few left in the field, good running machines. I'm going with Hook1 who thought it maybe wasn't toned up completely or that charge assy. They've upgraded that thing 7 or 8 times now trying to fix issues with it, although I find it will usually cause dark on one side, not light. Whenever I do MK's on those I save the old charge assy for a spare, sometimes I even have to reuse it in the new drum cause the brand new one has issues.