Epson N2700 manual Timing Roller Sensor Mechanism

EPL-N2700 Revision A

￿(3) MP Cassette Paper Near Empty Sensor (PC5)

This sensor detects the paper near empty status of the MP Cassette paper. The sensor uses a photointerrupter. As the sheets of paper in the paper cassette decrease, the paper lifting plate in the paper cassette lifts. When the paper lifting plate lifts exceeding a certain point, the MP Cassette paper near empty occurs.

￿Paper near empty detection accuracy: 50 ± 30 sheets

When enough paper is present in the paper cassette:

The paper lifting plate is lowered. In this condition, the lower part of the sensor arm is engaged with the photointerrupter. Thus, the light from the LED of the photointerrupter is blocked by the sensor arm and the photointerrupter turns OFF. As a result, the

￿output of the photointerrupter is “H”.

When the remainder of paper decreases:

The upper part of the sensor arm is pressed by the paper lifting plate and the lower part of the sensor arm comes off the photointerrupter. Thus, the light from the LED passes in the photointerrupter and the photointerrupter turns ON. As a result, the output of the photointerrupter is “L”.

￿Timing Roller Front Sensor (PC2)

This sensor detects that the paper is fed inside the printer. The sensor uses a photointerrupter. The output of the sensor is used as a reference for feeding paper inside the printer. This sensor will be ￿activated when paper is fed from any paper source.

No paper is fed:

The sensor arm is pressed by a spring and the end of the sensor engages with the photointerrupter. As a result, the output of the

￿photointerrupter is “H”.

Paper is fed to the Timing Roller Front Sensor:

The sensor arm is pushed by the paper and the end of the sensor arm comes off the photointerrupter. As a result, the output of the photointerrupter is “L”.

Timing Roller Front Sensor (PC2)

MP Cassette Paper
Near Empty Sensor (PC5) Paper				Few Paper	Paper
					Light is blocked:
						Light passes:
					Output = H
						Output = L
			Paper Lifting Plate		[No paper]	[Paper is present]
	Paper Lifting Plate
		Light passes:			Figure 2-8. Timing Roller Sensor Mechanism
Light is blocked:
Output = H		Output = L
[Paper is present]		[Paper near empty]
Figure 2-7. MP Cassette Paper Near Empty Sensor Mechanism
Operating Principles				Printer Mechanism Operating Principles		58