Read Panasonic KX-NT543RU / KX-NT543RU-B / KX-NT546RU / KX-NT546RU-B (serv.man2) Service Manual online
9
KX-NT543RU/KX-NT543RU-B/KX-NT546RU/KX-NT546RU-B
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.
3. Headset Call
Transmitting signal is input from headset microphone and amplified by IC105
→ input to IC501-pin H4 → 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 E2 →
output to headset speaker.
+
-
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
+
-
AG2
R144
MICBIAS2
AG2
C164
AG2
OPBIAS2
AG2
R143
HESMIC2
HESSPOUT2
IC105
3
2
1
C168
R142
C161
C165
C169
C167
C166
C170
L112
C178
AG2
R137
R155
C160
CN101 CN205
2
3
C187
AG2
R140
R141
IC501
BBIC
R547
H4
E2
C221
C217
C218
JK202
1
4
2
3
5
C226
C205
D245
21
D247
21
D246
21
L210
L209
L208
10
11
AG
AG
C207
R223
HEADGND
ASIC
IC205
HEADGND
HEADGND
HEADGND
HEADGND
L212
AG
HEADGND
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