Panasonic KX-FPC135 Service Manual page 177

1. [Read Position Sensor (PS302)]
When a document is brought to the read position, the shelter plate is lifted, the phototransistor becomes ON, and the input
signal of IC301-20 pin (Operation) becomes a low level. When there is no document at the read position, the shelter plate
closes the sensor light, the phototransistor becomes OFF, and the input signal of IC301-20 pin (Operation) becomes a high
level. (When checking this sensor, the IC301-9 pin becomes a low level.)
2. [Document Sensor (PS301)]
When a document is set, the shelter plate closes the sensor light, the phototransistor becomes OFF, and the input signal of
IC301-20 pin (Operation) becomes a high level. When there is no document, the shelter plate is lifted, the phototransistor
becomes ON, and the input signal of IC301-20 pin (Operation) becomes a low level. (When checking this sensor, the IC301-4
pin becomes a low level.)
Operation Board
Phototransistor
Out of the Read Position
At the Read Position
Operation Board
Phototransistor
No document
Set document
Signal (IC301-20 pin)
OFF High level
ON Low level
Signal (IC301-20 pin)
ON Low level
OFF High level
177
KX-FPC135 / KX-FPC141