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2-26 Phaser 8400/8500/8550/8560 Color Printer Service Manual
Theory of Operation
Paper Pick for Trays 2 - 4
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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.
Exit Sensor
Deskew Sensor
Preheat Exit Sensor
Strip Sensor
Deskew Roller
Retard Roller
Take Away Roller
Pick Roller
Nudger Roller
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