Panasonic KX-FP101AL Service Manual page 147

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.)
Out of the Read Position
At the Read Position
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.)
No document
Set document
Operation Board
Phototransistor Signal (IC301-20 pin)
OFF High level
ON
Operation Board
Phototransistor Signal (IC301-20 pin)
ON
OFF High level
147
Low level
Low level
KX-FP101AL