Read Panasonic KX-NT553RU-B / KX-NT556RU-B Service Manual online
10
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
2. Handset call
Transmitting signal is input from handset microphone
input to IC502-K18, K19 A/D conversion, Gain adjustment by a
built-in DSP of IC502.
Receiving signal input from IP Line
Receiving signal input from IP Line
Gain adjustment and D/A conversion by DSP of IC502 output from IC502-V18, V19
output to handset speaker.
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
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
Handset
R116
C101
C103
C145
R114
C142
R112
C127
C138
R119
C141
R120
3.3k
C139
R115
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
R108
R111
AGND
MICBIAS
R131
C150
C125
C126
C133
C134
C102
C118
C122
D106
D107
D108
D109
JK102
2
3
4
5
L104
L105
AGND
AGND
AGND
AGND
AGND
M18
M17
K18
K19
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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