Panasonic KX-TCD725RUM Service Manual page 185

LINE VOLTAGE 48V DC +100mVrms at 1kHz
HANDSET ON CHARGE
+12V
+5V
IC10
+2.8V
PULLS TOWARDS
0V DURING RING
12V DC
RING
IC8
IC11
48V DC
CLIP
(CALLER ID
IC2
3.8V DC
2.8V DC
IC7 IC1
+48V DC ON-HOOK
+6.8V DC OFF-HOOK
N.M.
N.M.
0R
IC3
N.M. N.M.
CHARGE
PULSE
IC9
IC5
(at 40mA)
1.4V DC