ThisiP4300 printer has worked well for 6 years. Recently it has started to miss lines of black text when print quality set to Standard, my normal setting. When quality is set to High all lines are printing. If I print several copies of the same page, exactly the same lines are missing. If I print copies of a second page the same lines arre missing on each copy but they will be at different locations from the first page. I have tried the cleaning options and the head alignment with no change in the problem. Much thanks for any suggestions.
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