Panasonic KX-T7730X - Handset Circuit

CONDITION IC1 pin52 IC5 SWA IC1 pin53 IC5 SWB IC1 pin54 IC5 SWC IC1 pin55
IC5
SWD
Ringing L OFF L OFF L OFF H
ON
Call Waiting L OFF L OFF H ON L
OFF
Tone Dial (Handset) H ON H ON L OFF L
OFF
Tone Dial
(Speakerphone)
H ON L OFF H ON L
OFF
7.5. HANDSET CIRCUIT
1) Transmission Signal Path
The input signal for the handset microphone is sent through the telephone line via the following
path:
Handset MIC(JK2) JK3 C24 R26 C34 Q5 C21 R21 Q3 C4 T1
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