Read Panasonic KX-DT521RU Service Manual Supplement online
5
3. Headset Call
Transmitting signal is input from headset microphone
input to IC410-pin 26 amplified by a built-in analog amplifier of
IC410
A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.
Receiving signal is sent by data from PBX
Gain adjustment and D/A conversion by a built-in DSP of IC410 amplified by
a built-in analog amplifier of IC410
output from IC410-pin 42 output to headset speaker.
IC410
C571
R566
AGND
AGND
AGND
AGND
AGND
MICBIAS
L461
L462
R569
C576
C577
C578
C579
C581
R570
C580
DG
DCX81
26
LIN0
42
LOUT
CN400
2
CN205
13
3
HESMIN
HESSPOUT
12
Main PCB
IC205
ASIC2
Ope PCB
CN202
1
4
2
3
3
5
AGND
AG
C226
C205
AG EADGND
HEADGND HEADGND
HEADGND
HEADGND
R222
R223
C207
HEADGND
AG
HEADGND
C217
C218
D246
L209
D247
L210
L212
D245
L208
C221
6
GKEYIN0
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