Read Position Sensor - Panasonic KX-MB2230JT Service Manual

KX-MB2230JT/ KX-MB2270JT/ KX-MB2515JT/ KX-MB2545JT/ KX-MB2575JT/ DP-MB310JT

6.12.7. 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 IC300-AB24pin 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 IC300-AB24pin becomes low level.
This sensor LED is controlled by IC300-M26pin.
A document exists
No document
LED control
Sleep
Standby
70
Signal (IC300-AB24pin)
High level
Low level
Signal (IC300-M26pin)
50% duty
High