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Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.05 Paper-End Detection Mechanism
Rear Paper Feed
When paper is installed in the printer, it prevents the paper-end lever (Tip A) from falling into the groove of
the paper chute and platen. This activates the paper-end sensor.
When the printer runs out of paper, the paper-end lever falls into the groove of the paper chute. The rear
part of the paper-end lever deactivates the paper-end sensor. An out-of-paper condition is detected.
Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead
position.
Bottom Paper Feed
Paper installed in the printer contacts the paper-end lever (Tip B). The paper prevents the bottom
paper-end lever from falling into the slot in the bottom paper guide. This causes the rear part of the
paper-end lever to activate the paper-end sensor.
When the printer runs out of paper, the tip of the bottom paper-end lever falls into the hole in the bottom
paper guide. The rear part of the paper-end lever activates the paper-end sensor. An out-of-paper
condition is detected.
Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead
position.
Cut-Sheet Paper Feed
Paper installed in the printer prevents the paper-end lever (Tip C) from falling into the groove of the paper
chute. The paper-end sensor is activated.
When paper is removed, the paper-end lever falls into the groove of the paper chute. The rear part of the
paper-end lever deactivates the paper-end sensor. An out-of-paper condition is detected.
Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead
position.
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