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CONDITION
Ringing
Call Waiting
Tone Dial (Handset)
Tone Dial
(Speakerphone)
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)
IC1 pin52 IC5 SWA IC1 pin53 IC5 SWB IC1 pin54 IC5 SWC IC1 pin55 IC5 SWD
L
OFF
L
OFF
H
ON
H
ON
JK3
C24
R26
L
OFF
L
OFF
H
ON
L
OFF
C34
Q5
C21
12
L
OFF
H
ON
L
OFF
H
ON
R21
Q3
C4
H
ON
L
OFF
L
OFF
L
OFF
T1
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