KX-NT551RU-B - Panasonic Telephone Service Manual (repair manual). Page 10

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10
KX-NT551RU/KX-NT551RU-B
3. Headset Call
Transmitting signal is input from headset microphone 
 input to IC502-N15  A/D conversion, Gain adjustment by a built-in
DSP of IC502.
Receiving signal input from IP Line 
 Gain adjustment and D/A conversion by DSP of IC502  output from IC502-L17  out-
put to headset speaker.
IC502 CN205
Handset
R118
MICBIAS
C137
HEADSET-OUT
C136
L108
R113
C143
HEADSET-IN
AGND
AGND
AGND
AGND
AGND
R126
C205
C130
C144
HEADSET_IN
001:4E
HEADSET_OUT
001:4E
L106
N15
L17
C221
C217
CL204
CL203
CL206
CL205
C218
JK202
1
4
2
3
5
C226
C205
AG_PAD
L210
L209
L208
AG
AG
AG
C207
R223
HEADGND
HEADGND
HEADGND
HEADGND
HEADGND
D247
1
2
D246
1
2
D245
1
2
12
14
Handset
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