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Phaser 8400/8500/8550/8560 Color Printer Service Manual 2-25
Theory of Operation
Paper Pick for Tray 1
To pick a sheet of paper, the Tray 1 solenoid actuates, and the drive gear
rotates slightly to engage with the drive train. A bias force from the lift plate
against a rotating cam causes the roller to rotate enough so the missing tooth
gear engages the drive train. This allows the lift plate and paper stack to
rotate against the Pick Roller. The Pick Roller then rotates to pick the paper. A
Separator Pad prevents multiple sheets from being picked by the Pick Roller.
Key differences in the Tray 1 pick process include:
■ Increased lift plate force to support heavier paper.
■ 100-sheet capacity.
■ Pick Roller to create the buckle for the deskew process.
■ Pick Roller drive to disengage when the door is opened and closed.
■ Pivoting separator pad to prevent it from binding.
s8500-024
Spring Loaded Lift Plate
Cam
Drive Gear
Pick Roller
Separator Pad