Panasonic UF-6300, Service Manual

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6.2.8 SNS PC Board
Each sensor consists of an LED and photo transistor. When documents are placed on the ADF tray or are
moving, a shutter in the document sensor opens. The light from the LED turns the photo transistor “ON”,
and the output voltage from the sensor becomes a “Low” level. With no document on the ADF tray, the
shutter interrupts the light path, and output from the sensor is kept at a “High” level. Operation of the RP
Sensor is exactly the same as the ADF Sensor. The ADF Cover Sensor operation is similar, except that the
output from the sensor is kept at a “Low” level when the cover is closed and becomes a “High” level when
the Printer Cover is opened.
Read Point
Sensor
GND
+5V
+5V
nBPNT
PC3
Shutter
A
K
(S-Door)
ADF Cover Sensor
CPU
(IC1)
Shutter
PC2
A
K
ADF
Sensor
GND
PC1
Shutter
A
K
SC PC Board PNL1 PC Board
+5VP
+5VP
PNL CPU
IC1