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KX-T7730CA
4.2.5. 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 → C3 → Q1 → D1 → Telephone
Line
2. Reception Signal Path
The input signal from the telephone line is sent to the receiver through the following path:
Telephone Line → D1 → Q1 → C3 → T1 → C4 → Q3 → R10 → C8 → R12 → Q4 → C26 → R32 → IC10 → C32 → R34 →
C27 → R208 → Q8 → C31 → JK3 → JK2 → Handset Speaker
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