Specifications

C-7
PagePro25
(5) Synchronizing Roller 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.
Without paper, the sensor arm is pressed by a spring and the end of the sensor engages with the photointerrupter. Thus,
the light from the LED of the photointerrupter is blocked and the photointerrupter turns OFF. As a result, the output of the
photointerrupter is “H”.
On the other hand, when paper is taken up, the sensor arm is pushed by the paper and the end 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”.
(6) 1st Cassette Paper Size Detection
The paper size for the 1st paper cassette is set by the switch on the 1st cassette paper size detecting board (PWB-S1).
The switch is a rotary encoder with four output lines. The output levels of the four output lines vary with the rotational
angles of the switch. These four outputs are fed to the control circuit on the main board and decoded to detect the paper
size being selected.
Synchronzing Roller Sensor (PC2)
Light passes:
Output = L
Paper
Light is blocked:
Output = H
[No paper]
[Paper present]
1st Cassette Paper Size Detecting Board (PWB-S1)
Size 1
Paper size decoded signalsDecoder
Size 2
Size 3
Size 4