1-14 Service Manual
4023-001
1st Cassette Tray 1 Double Feed Sensor
The double feed sensor (located on the double feed detecting
sensor board (PWB-H)) detects the possibility of double feed. This
sensor uses a photo reflector.
The double feed sensor detects whether the leading edge of paper
to be taken up next runs 10 mm or more from the paper nip point. If
paper runs 10 mm or more, double feeding may occur if the paper is
taken up in the normal printing interval. To avoid this, the printer
prolongs the printing intervals as long as the double feed sensor
detects a double feed status. This results in the reduction of the
number of sheets fed per minute.
1st Cassette Tray 1 Synchronizing Roller Sensor (PC2)
This sensor detects that the paper is fed inside the printer.
Light reflects: Output=L Light does not reflect: Output=H
1 Paper
2 Paper Take-up Roller
3 Double Feed Sensor
1 Synchronizing Roller Sensor (PC2)
2 Paper
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