Xerox 3400N - Phaser B/W Laser Printer, Service Manual

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34 Xerox Phaser 3400 Printer Service Guide
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The registration sensor has two purposes. First, it is used to monitor paper movement. If
the paper takes too long getting to the sensor, or it stays at the sensor too long, the Print
Engine Controller Board will shut down the printer and light both the Paper and Error
LEDs on the control panel. Second, the signal generated by the sensor tells the Print
Engine Controller Board that the paper is almost at the transfer area and it is time to start
the xerographic process. It is important that the leading edge of the paper enters the
transfer area at the same time that the leading edge of the drums developed image reaches
the transfer area.
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The registration and paper out sensors are mounted on the Print
Engine Controller Board. The Fuser Exit sensor is mounted on the
rear frame.
P3400-012
Registration
Actuator
Paper Out
Actuator
Fuser
Exit Sensor
Actuator
Printer
Bottom
View