Read Panasonic KX-UT113RU / KX-UT113RU-B / KX-UT123RU / KX-UT123RU-B (serv.man3) Service Manual online
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KX-UT113RU/KX-UT113RU-B/KX-UT123RU/KX-UT123RU-B
4.2.4.
Analog Circuit
1. Speaker phone call
Transmitting signal is input from microphone and amplified by IC103
→ input to IC501-pin G2 → A/D conversion, Gain adjust-
ment and echo cancel by a built-in DSP of IC501.
Receiving signal input from IP Line
Receiving signal input from IP Line
→ Gain adjustment and D/A conversion by DSP of IC501 → output from IC501-pin E1,F1
→ Amplified by IC101 and output to Speaker.
Class D Amp IC101 is controlled as follows;
IC101-pin1 H (3.3V): Amp ON , IC101-pin1 L (0V): Amp OFF
Class D Amp IC101 is controlled as follows;
IC101-pin1 H (3.3V): Amp ON , IC101-pin1 L (0V): Amp OFF
2. Handset call
Transmitting signal is input from handset microphone and amplified by IC103
→ input to IC501-pin J1 → A/D conversion, Gain
adjustment by a built-in DSP of IC501.
Receiving signal input from IP Line
Receiving signal input from IP Line
→ Gain adjustment and D/A conversion by DSP of IC501 → output from IC501-pin H1,G1
→ output to handset speaker.
+
-
MIP
AG3
OPBIAS
SPP
SPN
SPAMPEN
C117
5V
AG3
MICBIAS
C134
R101
R102
R102
R130
R131
SPP
SPN
MIP
MIN
L101
L102
IC103
3
2
1
C122
C110
R124
R125
C129
C130
R126
R127
C111
C101
C102
C102
C135
AG3
L103
L104
D108
DL101
1
2
3
C174
C175
C121
C118
C176
C177
C123
C126
C138
DG
DG
DG
DG
DG
DG
DG
DG
DG
DG
C182
C183
C184
R109
R152
C185
AG3
C105
IC101
1 STBY
2 NC
3 IN+
4 IN-
5
OUT+
6
VDD
7
GND
8
OUT-
9
FIN
CL103
CL104
CL106
CL105
DG
DG
C191
C190
C192
C193
AG3
AG3
R118
R119
D107
D101
D102
IC501
BBIC
E3
F1
E1
G2
+
-
AG3
HSMICINP
C115
OPBIAS
MICBIAS
AG
AG3
AG
AG
JK101
1
2
3
4
2
3
4
5
R132
R133
IC103
5
6
7
C127
C128
R122
R123
C109
C124
R128
R129
D103
D104
D105
C125
C137
C139
C179
C180
C181
DG
DG
DG
DG
R112
R153
C186
AG3
C107
DG
DG
C143
C141
L108
L107
DG
DG
C189
C188
C146
C147
R120
R121
D106
L106
L105
IC501
BBIC
C542
DG
J1
H1
G1
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