Panasonic UF-585 Service Manual page 202

Panasonic UF-585 / 595
6.2.9 SNS PC Board
Each sensor consists of an LED and phototransistor. 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 phototransistor "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 Printer Cover Sensor (ILS PC Board) 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.
Printer Cover Sensor
(ILS PC Board)
Read Point
Sensor
PNL CPU
IC1
ADF
Sensor
210
+5V
Shutter
A
PC2
K
Shutter
A
PC3
K
+5VP
Shutter
A
PC1
K
PNL1 PC Board
+5V
nBPNT
+5VP
GND
SCA/SCB PC Board
CPU
(IC1)
GND
MPU