HP Color 9850mfp Service Manual - Page 471
Formation of a registration loop, Letter / Legal / 5.5 by 8.5R / A5R / A4
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Punch kit overview 2 holes / 4 holes / Inch 2 holes / Swedish 4 holes MFPs B6 / 16K 3 holes MFP Letter / Legal / 5.5 by 8.5R / A5R / A4 Rack Punch unit Belt Punch shift motor (M802) FRONT Guide shafts Punch unit Punch edge Paper edge sensor 5mm or 10mm Formation of a registration loop The finisher conveyance motor (M701) turns off temporarily to stop conveyance of paper when the specified time has passed since paper exit PS (PS37) detected the leading edge of the paper. Thus the paper is pressed against the entrance roller forming a loop to correct the bend. When the specified time has passed, M701 turns on to restart conveying the paper. The above operation is not performed when conveying a large paper (220 mm and longer in direction of conveyance) and in the non-punching mode. When punching the paper conveyed from PI, the loop is formed on the PI's side. For details, refer to Q3636A SHB. (Main body) Entrance roller Loop Direction of paper conveyance Paper ENWW Punching process 7
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