Panasonic KX-T7730CA, Service Manual

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10
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