Xerox 8500DN Service Manual - Page 58
Paper Pick for Trays 2 - 4, Exit Sensor, Deskew Sensor, Preheat Exit Sensor, Strip Sensor
UPC - 095205022063
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Page 58 highlights
Theory of Operation Paper Pick for Trays 2 - 4 Note Trays 3 and 4 are 525-Sheet Feeders. For Trays 2 through 4, the paper pick process is different than the pick process used by Tray 1. To pick a sheet of paper, the Media Path Drive starts, and the pick clutch engages, which turns the Pick Roller and the Nudger Roller. The Nudger Roller advances one sheet of paper forward into the pick nip. The Retard Roller prevents two sheets from advancing. The sheet of paper continues past the Take Away Roller until the sheet completes the deskew process. When using the optional 525-sheet feeder, paper is pre-picked from the tray and staged in the paper path while the printer is printing previous pages. The deskew process uses a reverse/buckle deskew for all three paper paths. The paper is driven against the non-rotating rollers, which are reversing during simplex, causing a buckle in the paper ensuring the leading edge is straighten to prevent skewing. The deskew rollers do not reverse during duplex printing. Strip Sensor Exit Sensor Preheat Exit Sensor Deskew Roller Deskew Sensor Take Away Roller Retard Roller Pick Roller Nudger Roller s8500-025 2-26 Phaser 8400/8500/8550/8560 Color Printer Service Manual