Panasonic KX-TS105B Service Manual page 17

(6.3V)
4.2V
(5.8V)
IC201
3.7V
R315
3
(3.7V)
0
IC303
VOUT VCC
The voltage during ON-Hook is indicated.
( ) shows the voltage during OFF-Hook.
Handset & Headset Incoming Signal
Handset & Headset Outgoing Signal
IC1
(6.3V)
IC304
3.9V
(5.7V)
R100
100K 390K
Speaker Phone Incoming Signal
Speaker Phone Outgoing Signal
Battery Low
3.8V
4.5V
IC302
KX-TS105B : SCHEMATIC DIAGRAM