Xerox 4400DT - Phaser B/W Laser Printer, Руководство по обслуживанию, Страница: 453 / 503

8-40 Phaser 4400 Laser Printer Service Manual
Function of Major Components
The two figures on page 8-39 show the major components of the Stacker.
■
Drive Motor Assembly — Drives the Stacker Mid Roller Assembly and the
Exit Roller Assembly.
■
Offset Motor Assembly — Shifts the Offset Roller Assembly.
■
Stack Full Sensor and Stack Full Actuator — Detects when the stacking of
the Exit Tray exceeds 500 sheets of paper.
■
Stacker PWB — Controls Stacker operations.
■
Offset Roller Assembly — Drives printed pages into the Stacker Tray,
offsetting each from the normal position.
■
Stacker Exit Sensor Assembly — Located between the Mid Stacker Roller
Assembly and the Offset Roller Assembly, it detects when paper passes into
the Tray Exit.
■
Home Sensor — The Stacker Home Sensor detects when the Offset Roller
Assembly is in the home position. It is turned On when the Core Gear is
located at the sensing point of the Stacker Home Sensor.
■
Direction Solenoid and Lever — Switches the paper path between the
normal paper path and the Stacker paper path.
Stacker Control
Offset Motor Control
When the end of a sheet of paper reaches the Stacker Exit Sensor Assembly, the
sensor signal goes Low. The Offset Motor Assembly begins rotating clockwise for a
specified time after the signal goes Low. This clockwise rotation shifts the sheet of
paper from the normal position. At the specified time after the Sensor Assembly Exit
goes Low, the Exit Motor Assembly begins rotating in the counterclockwise
direction, moving the Offset Roller Assembly back into home position, until the
Sensor Stacker Home signal (/Stacker HOME) goes Low. When the power is first
switched on, the Offset Motor Assembly performs this offset operation once to make
sure the Offset Roller Assembly is in the home position.
Duplex Operation
When the printer is running in Duplex mode, the paper partially feeds out into the
standard Exit Tray (under the Stacker Assembly). The paper then reverses direction,
is printed on the second side, and sent to the Exit Tray of the Stacker.
Full Stack Detection
The Engine Logic Board examines the state of the Full Stack Sensor after the Sensor
Assembly Exit signal goes Low. The Engine Logic Board detects that the Exit Tray is
full when the Stack Full Sensor remains High for a set number of successive Exit
Sensor Assembly actuations (sheets of paper exiting in the Stacker). The Stack Full
condition stays in affect until the Stack Full Sensor goes Low.