KX-DT543RU, KX-DT546RU - Panasonic Telephone Service Manual (repair manual). Page 11

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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.

IC300 controls Data Communication (refer to chapter 4.2.3) between PBX and proprietary telephone, and DXDP Communication
(refer to chapter 4.2.4) .
IC410 controls IC300 with SPI (Serial peripheral interface).
PCM signal (encoded audio signal) is exhanged between IC300 and IC410.

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

CN160

13

3

HESMIN

HESSPOUT

12

Main PCB

IC150

ASIC2

Ope PCB

JK160

1

4

2
3

5

AGND

AGND

AGND

C165

C167

C166

AGND   HEADGND

HEADGND   HEADGND

HEADGND HEADGND HEADGND

R160

R161

C164

HEADGND

AGND

HEADGND

C159

C158

D162

L160

D161

L161

L162

D163

L163

C168

C169

6

GKEYIN0