Lexmark W820 - Optra B/W Laser Printer Service Manual page 36

Mechanical Stacker Tray Components
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Drive for Top Tray Exit
The rotation of the Exit Top Motor transmits a driving force to the Exit Top Belt. Driving the
Exit Top Belt transmits a driving force to the Exit Top Gear (Lower, Middle and Upper), to
rotate them. Then, the rotation of each gear rotates the Exit Top Roller.
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Service Manual
4025-Finisher
The Lift Up Motor supplies a driving force to the Elevator Shaft via each gear on the
Elevator Drive Unit.
The Elevator Drive Unit supplies the driving force generated by the Lift Up Motor to
the Elevator Drive Gear and Liner Encoder.
The Elevator Drive Gear rotates the Elevator Shaft by the driving force transmitted
from the Elevator Drive Unit.
The Elevator Belt elevates the Stacker Tray by the rotation of the Elevator Shaft.
The Lift Up Gear 3 rotates the Liner Encoder by the driving force transmitted from
the Lift Up Motor.