Panasonic KX-FT21RS - Manual (Page 150)

9.4. SCHEMATIC DIAGRAM (OPERATION CIRCUIT)
OV/3.3V/5V
5V
0V
5V
0V
5V
0V
PAPER 5V
Document
sensor
sensor
NO PAPER 0V
Read
position
5V
0V
SENSOR SCAN 5V
KEY SCAN 0V
KX-FT21RS
150