Panasonic KX-FLB852CX Service Manual page 239

7.12.4. SORTER ENTER SENSOR
This sensor detects whether the recording paper exits or not.
When there is a recording paper at the position of the sensor, the input signal of IC604-27pin becomes low level.
When there is no recording paper at the position of the sensor, the input signal of IC604-27pin becomes high level.
7.12.5. SORTER BIN1 SENSOR
This sensor detects whether an output tray #1 is full of paper or not.
When the output tray is full of paper, the input signal of IC604-28pin becomes high level.
When the output tray is not full of paper, the input signal of IC604-28pin becomes low level.
Signal (IC604-27pin)
A paper exists
No papers
Signal (IC604-28pin)
TRAY #1 is full
TRAY #1 is not full
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Low level
High level
High level
Low level
KX-FLB852CX / KX-FLB852CXS