Paper Detection Mechanism - OKIDATA ML590 Service Manual

Page: 85
Service Guide ML590/ML591
Chapter 2 Principles of Operation

2.2.06 Paper Detection Mechanism

Top Feed Paper Detection
When the cut sheet paper is inserted into the printer, Point A of Paper Near End Lever - B is
pushed backward rotating Paper Near End Lever - A.
As Paper Near End Lever - A rotates, it contacts the Rear Sensor Lever, rotating it.
The Rear Sensor Lever rotates, unblocking the Rear / Top Paper End Sensor.
Rear Feed Detection
When paper is fed from the rear push tractor, Point B is pushed backward rotating Paper Near
End Lever - A.
As Paper Near End Lever - A rotates, it contacts the Rear Sensor Lever, rotating it.
The Rear Sensor Lever rotates, unblocking the Rear / Top Paper End Sensor.
Bottom Feed Detection
When the paper is fed from the bottom of the printer, Point C is pushed, rotating the Bottom Paper
End Lever.
As the Bottom Paper End Lever rotates, it contacts and rotates the Bottom Sensor Lever.
The Bottom Sensor Lever rotates, unblocking the Bottom Paper End Sensor.
Note: The method for detecting a paper-end condition is in the reverse order,
that is, paper-end is detected when the Paper End Sensor is blocked.