Panasonic KX-FT21BX Service Manual page 157

[Motor Position Sensor]
This sensor is a detection switch for recording the position of the CAM.
[Recording Paper Sensor (SW1) ]
When there is no recording paper, the plate is separated from the switch lever and the switch turns off.
Pin 9 of CN1 (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 CN1 (Analog board) becomes a low level.
PLATE
+5V
R77
SW3
CN5
1
R78
2
Digital Board
Signal (IC1-174 Pin)
Home position
Other
+5V
R3
SW1
Analog Board
Signal (CN1-9 Pin)
Paper Low level
No paper High level
- 131 -
IC1
174
C78
Low level
High level
CN1
9
R1
C1
KX-FT21LA