Panasonic KX-FLB852CX Service Manual page 242

KX-FLB852CX / KX-FLB852CXS
7.12.10. READ POSITION SENSOR
This sensor detects the front edge of the document.
When the front edge of the document is detected, the shelter plate closes the sensor light.
So the photo-transistor turns off and the input signal of IC604-111pin becomes high level.
When the front edge of the document is not detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on and the input signal of IC604-111pin becomes low level.
7.12.11. REGISTRATION SENSOR
This sensor detects whether the recording paper is at the sensor position.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC604-112pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC604-112pin becomes high level.
Photo-transistor
A document exits
No document
Photo-transistor
Paper exits
No paper
Signal (IC604-111pin)
OFF High level
ON Low level
Signal (IC604-112pin)
ON Low level
OFF High level
242