Circuit Operation - Panasonic KX-TS2365RUB Service Manual

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13.4.1 Circuit operation

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On hook
Q101 is open, Q101 is connected as to cut DC loop current and cut the voice signal.
Off hook
Q101 turns on thus providing an off-hook condition (active DC current flow through the circuit)
and the following signal flow id for the DC loop current. T
R124 D106
The receiving signal flows:
TEL line POS101
The transmission signal flows
Mic Q421
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D101 R
Q101 C113
Q424 C435 R437
POS101
R125 C108 Q109
Q108 Pos101
D101 Q101
Q405 Q406
Tel Line
Q108
Speaker