Paper Stack Sections - Lexmark W820 - Optra B/W Laser Printer Service Manual

4025-Finisher

Paper Stack Sections

From the Finisher Exit section, the paper or a bundle of paper is delivered on the Stacker
Tray. The Stacker Height Sensor detects the stack amount of bundles of paper, and
moves up or down the Stacker Tray according to the stack amount. At the initialization,
the absolute position of the Stacker Tray is recognized by the rotation of the Liner
Encoder. The Stacker Tray absolute position is defined to three positions, 25%, 50%, and
100%, according to the stack amount. The slits differently spaced on the Liner Encoder
correspond to respective positions. The absolute position is recognized when the Stacker
Tray Position Sensor detects a slit on the Liner Encoder for the first time. The Stacker Tray
moves up to the position where the Sensor B of the Stacker Height Sensor turns off.
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Introduction