Sensor Input Circuit - Xerox Phaser 3140 Service Manual

Theory of Operation

Sensor Input Circuit

Paper Empty Sensing
Manual Feed Sensing
Paper Feeding/With Print Cartridge Sensing
2-16
Output Bin Full Sensor
Paper Exit Sensor
Paper Empty Sensor
The Paper Empty (width) Sensor on the Power Supply detects the state of paper
empty and the state of narrow paper width. If the Paper Empty sensor fails to
detect paper existence, it can mean that the Paper Tray is empty, or that narrow
paper is installed.
When the print job comes to the CPU, the pickup action is performed regardless of
a paper empty condition. If the paper comes through to the Feed Sensor, the CPU
recognizes the use of narrow paper, if not, the paper empty state is recognized and
the red LED on the Control Panel is illuminated.
Through the operation of an actuator on the frame, the Manual Feed Sensor
(photo interrupter) detects the existence of paper. The CPU recognizes paper in
the manual feeder, and feeds it into the printer.
When media passes the Feed Sensor actuator, the Feed Sensor sends the feed
event to the CPU. If the Feed Sensor does not detect media after a predetermined
time, a Jam0 state occurs.
Whether the Print Cartridge is inserted or not is detected by CRUM. After the
cartridge is mounted, the sub- CRUM reads the print cartridge information from
contact with CRUM involved in print cartridge. If the Print Cartridge is invalid, the
red LED on the Control Panel illuminates.
Manual Feed Sensor Cover Open Sensor
Paper Feed Sensor
Phaser 3140/3155/3160 Printer Service Manual
s3160-142