Duplex Sensors - Xerox Paser 7400 Service Manual

Sensor Function (Continued)
Sensor
Inverter Upper Paper-
Present Sensor
Inverter Lower Paper-
Present Sensor
Inverter Paper-in Sensor

Duplex Sensors

The Duplex Unit receives media diverted to the Side Exit by the Exit Gate. The media
is detected by the Duplex Entrance Sensor and drawn into the Duplex Unit. The
media is inverted and exits the Duplex Unit just above Registration Roller #2. Media
moves through the Duplex Unit as follows:
1.
After Side 2 is printed, the Exit Gate Solenoid switches the Exit Gate to its side
output position. This directs the sheet downwards toward the Duplex Unit.
2. As the sheet reaches the Duplex Entrance Sensor, roller 1 turns, drawing the
media into the lower portion of the Duplex Unit
3. After the trailing edge of the media clears the Duplex Entrance Sensor, and with
the Duplex Reverse Sensor High, the Entrance Roller is reversed and the Duplex
Solenoid is activated to position the Duplex Gate to direct the inverted media into
the upper portion of the Duplex Unit.
4. The Duplex Rollers transport the media out of the Duplex Unit and into the
printer where Side 1 is printed. This portion of the duplex path is monitored by
the Front and Rear Duplex Sensors.
Duplex Entrance Sensor
Duplex Reverse
Sensor
Duplex Front Sensor
Theory of Operation
Function
Detects the leading edge of the selected paper size.
Detects the trailing edge of the selected paper size.
Detects the presence of media in the Inverter.
Duplex Rear Sensor
Paper End Sensor
s7400-676
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