Have a MX-3640 document feeder that after scanning requests 5 1/2 by 8 1/2 paper. copier indicates 8 X 11 paper in document feeder. All switches working in document feeder. replaced board in document feeder and motor for possible timeing issue. Happens on only 8 x 11 paper not 8 x 11R or any other size. Talked to Sharp technical they are out of ideas.
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