KX-UT248RU, KX-UT248RU-B (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 11

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4. Bluetooth Headset call

The Bluetooth (BT) Module (IC506) is controlled by IC503 (BBIC) and IC103.
IC503 (BBIC) controls data communication on IC103 and IC506 in serial data.
The Bluetooth headset voices of transmission and reception are transferred by PCM.

Transmitting signal is input from Bluetooth headset microphone 

→ R606 → input to IC506-pin 19 → output from IC506-pin 3

→ R592 → input to IC103-pin 60 and D/A conversion → output from IC103-pin 98,99 → input to IC503-pin A16,B16 and gain
adjustment by a built-in DSP of IC503 

→ IP Line

Receiving signal is input from IP Line 

→ Gain adjustment by DSP of IC503 → output from IC503-pin A13,B13 → input to

IC103-pin 93,94 and A/D conversion 

→ output from IC103-pin 56 → R109 → input to IC506-pin 31 → output from IC506-pin

19 

→ R606 → Bluetooth headset speaker.

IC506

C119

SPP

C120

SPN

C121

MIP

C122

MIN

IC503

R527

R149

R102

C173

A13

B13

A16

B16

C18

D16

T7

P1

P3

M17

BT Module

IC103

93

94

98

99

57

60

56

55

10

11

8

R591

R592

R109

R596

BBIC

R636

3.3V

R531

3.3V

BT_FS

BT_DIN

BT_DOUT

BT_BCLK

2

3

31

32

PCM_SYNC

PCM_OUT

PCM_IN

PCM_CLK

R593

R599

R600

C561

BT_TX

BT_RX

BT_RST

6

9

14

R606

19

Bluetooth

Bluetooth

Headset