Oki ML520, ML521 manual Rear Feed Detection, Bottom Feed Detection

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Service Guide ML520/521

Chapter 2 Principles of Operation

2.2.06Paper Detection Mechanism Top Feed Paper Detection

When cut sheet paper is inserted into the printer, Point A of the Rear/Top Paper Feed Lever is pushed backward, causing the Sensor Lever to rotate.

As the Sensor Lever rotates, it contacts the Rear Sensor Lever. This makes the Rear Sensor Lever rotate.

The Rear Sensor Lever rotates, unblocking the Rear / Top Paper End Sensor (SNS1).

Rear Feed Detection

When paper is fed from the Rear Push Tractor, Point B is pushed backward. This makes the Sensor Lever rotate.

As the Sensor Lever rotates, it contacts the Rear Sensor Lever. This makes the Rear Sensor Lever rotate.

The Rear Sensor Lever rotates, unblocking the Rear / Top Paper End Sensor (SNS1).

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 the Bottom Sensor Lever. This makes the Bottom Sensor Lever rotate.

The Bottom Sensor Lever rotates, unblocking the Bottom Paper End Sensor (SNS2).

NOTE:

The method for detecting a paper-end condition is the reverse of the above. PAPER-END is detected when the Bottom Paper End Sensor (SNS2) is blocked.