I have a friend/profitable customer. They bought SCX-6545. They had constant black lines via the scanner glass. Many times I could not find anything on the glass, but they had lines. I replaced scan glass, scanner unit, main board, etc. Finally I replaced the machine with a new one. They are getting lines with the new one. They had a Konica-Minolta and Panasonic from me and never had this issue. Any one had this and/or how would you address this?
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