Panasonic KX-FT72BR-G Service Manual page 119

5.5.1. MOTOR POSITION SENSOR
This sensor is a detection switch for recording the position of the CAM.
5.5.2. COVER OPEN AND PAPER SET SWITCH (SW1)
When there is no recording paper, the plate is separated from the switch lever and the switch turns off.
Pin 9 of CN101 (Analog board) becomes a high level.
When there is recording paper, the plate pushes the switch lever and the switch turns ON.
Pin 9 of CN101 (Analog board) becomes a low level.
Digital Board
Signal (IC1-174 Pin)
Home position Low level
Other High level
Analog Board
Signal (CN1-9 Pin)
Paper Low level
No paper High level
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KX-FT72BR-G