Panasonic KX-FLB758RU Service Manual page 187

7.9.3. CIS POSITION SENSOR
These Sensors detect whether or not CIS is in home position.
When the CIS is detected, the shelter plate shuts off the sensor light, the photo-transistor turns OFF, and the input signal of
IC610-100pin /IC610-101pin becomes a high level.
When there is no CIS, the shelter plate let the sensor light pass through, the photo-transistor turns ON, and the input signal of
IC610-100pin /IC610-101pin becomes a low level.
ADF Home Sensor
FB Home Sensor
Phototransistor
Home position
Not Home position
Phototransistor
Home position
Not Home position
Signal(IC610 - 100pin)
OFF High level
ON Low level
Signal(IC610 - 101pin)
OFF High level
ON Low level
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KX-FLB758RU