DOWNLOAD Panasonic KX-DT543RU / KX-DT546RU Service Manual ↓ Size: 2.22 MB | Pages: 31 in PDF or view online for FREE

ORDER NO. KMS1604791SE

When servicing, you must confirm which service manual should be referred by the following methods.

L 3 0 2

JK300

R301

R 3 0 3

R311

C 3 0 2

C 3 0 4

R 5 5 2

R 5 5 4

C 5 5 0

C 5 5 1

C 5 5 6

C 5 5 7

C558

T3

C 5 8 9

P N L B 2 2 9 1 Z C - G W

C

REF-2

PbF

Refer to “PNLB2291ZC”

Model No.

KX-DT543/-B
KX-DT546/-B

E

KMS1403012CE

KX-DT543AL/AL-B
KX-DT546AL/AL-B

E

KMS1403047CE

KX-DT543NE/NE-B
KX-DT546NE/NE-B

E

KMS1401980CE

KX-DT543NZ/NZ-B
KX-DT546NZ/NZ-B

E

KMS1404058CE

KX-DT543RU/RU-B
KX-DT546RU/RU-B

E

KMS1404050CE

KX-DT543SX/SX-B
KX-DT546SX/SX-B

E

KMS1403013CE

KX-DT543UK/UK-B
KX-DT546UK/UK-B

E

D

D

D

D

D

D

D

KMS1403014CE

Suffix

Destination

KX-DT543X/X-B
KX-DT546X/X-B

F

E

KMS1403015CE

USA, Canada

(*Supplement 3 there is no.)

Australia

Europe

Russian, Ukraine, Kazakhstan

India

United Kingdam

Asia, Latin America, Middle Esat, Africa

Compatibility

Parts

Set Production

Original

New

Early (before change)

Late (after change)

Original parts may be used in early production sets only. 
New parts may be used in late production sets only. Stock both original 
and new parts.

Service Manual

Order No.

2

PAGE

PAGE

1 Technical Descriptions------------------------------------------3

1.1. Circuit Operations ------------------------------------------3

1.1.1. LCD Circuit ----------------------------------------------3
1.1.2. Reset Circuit --------------------------------------------3
1.1.3. Analog Circuit ------------------------------------------4

2 Troubleshooting Guide------------------------------------------6

2.1. No Operation ------------------------------------------------6
2.2. ASIC1(IC300) Does Not Operate -------------------- 12
2.3. LCD Does Not Operate --------------------------------- 13
2.4. DXDP Does Not Work ---------------------------------- 14
2.5. Audio Problem -------------------------------------------- 15
2.6. Handset Does Not Work-------------------------------- 15

2.6.1. Receive ------------------------------------------------ 15
2.6.2. Send ---------------------------------------------------- 16

2.7. Headset Does Not Work-------------------------------- 17

2.7.1. Receive ------------------------------------------------ 17
2.7.2. Send ---------------------------------------------------- 18

2.8. Speaker-Phone/Ringer Does Not Work ------------ 19

2.8.1. Receive / Ringer ------------------------------------- 19
2.8.2. Send ---------------------------------------------------- 19

2.9. LED Does Not Light ------------------------------------- 20

2.10. EHS Does Not Work------------------------------------- 21

2.10.1. EHS (Plantronics)  Does Not Work ------------- 21
2.10.2. EHS (Jabra) Does Not Work --------------------- 22

3 Schematic Diagram--------------------------------------------- 23

3.1. Main No.1 -------------------------------------------------- 23
3.2. Main No.2 -------------------------------------------------- 25

4 Printed Circuit Board ------------------------------------------ 27

4.1. Main Board------------------------------------------------- 27

4.1.1. Component View ------------------------------------ 27
4.1.2. Bottom View ------------------------------------------ 28

5 Exploded View and Replacement Parts List ----------- 29

5.1. Replacement Parts List --------------------------------- 29

5.1.1. Main Board Parts ------------------------------------ 29

3

LCD data are output from pin 66 of IC410 to LCD module.
LCD contrast is set by electronic volume in LCD module.
VCC33 (+3.3V) of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving volt-
age (approx. 13.8V(KX-DT546) / 10.0V(KX-DT543).)
The driving voltage is observed between pin 12 (V0) and pin 13(XV0) of CN460.

The lighting of the backlight is controlled by Q460.
The power of the backlight is output from DOUT4V5 of IC410.

IC410 (DCX81) is reset internally by itself when power is supplied.
Reset Signal is output from IC410 and input into IC300 (pin 1) ,CN460 (pin 5) and IC150 (pin 41).

D460

C460

L460

C462

C466

C464

C463

CN460

1

ESD-VSS

2

SCL

3

SDA

4

A0

5

/RES

6

/CS

7

VDD1

8

VD1

9

VSS

10

VDDA

11

VM

12

VO

13

XVO

14

VG

15

ESD-VSS

C467

DG

DG

VCC33

C461

C465

DG

DG

96

66

95

94

97

R435

R437

R436

R434

SPI_CLK

SPI_D0

LCD_A0

LCD_RS

LCD_CS0

7

LCD_BL

Q460

LED-

LED+

DCX81

IC410

25

C574

C575

LCD_PWR

DG

LCD Backlight

R463

C583

C582

DG

C584

DOUT4V5

EXGPIO10

GPIO18

GPIO17

GPIO16

GPIO15

GPIO19

6

IC410

DCX81

R423

DG

3.3V

C362

DG

1

IC300

RSTN

10

R424

DG

CN400

10

CN160

5

ASIC_RST

R155

41

C151

DG

94

CN460

5

/RES

LCD_RS

IC150

VCC33

5

EXGPIO9

GPIO15

EXGPIO8

VCC1

VCC2
VCC3

VCC4

94

79

73

ASIC1

LCD

RESET

ASIC2

Main PCB

Ope PCB

3.3V

RSTN

64

RESETIC

DG

DG

DG

C429

R474

R473

C469

IC470

C468

4

1

3

2

4

1. Speaker phone call

Transmitting signal is input from microphone 

 input to IC410-pin 33 and 34  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 38 and 40  output to Speaker.

2. Handset call 

Transmitting signal is input from handset microphone 

 input to IC410-pin 35 and 36  amplified by a built-in analog ampli-

fier 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 41  output to handset speaker.

MIP

SPP

SPN

SPAMPEN

IC410

DCX81

DG

AGND

AGND

AGND

SPP

AGND

SP2

MIP

AGND

MIC1

DG

AGND

SP1

MICBIAS

SPN

MIC2

MIN

AGND

AGND

C500

C501

C504

C503

C507

C502

C506

C530

C531

C532

C534

C535

C537

C538

R534

R532

R533

C536

DG

DG

DG

DG

G

D

G

D

D500

D501

D530

D531

R565

C569

C540

C541

R530

R531

38

SPOUTP

40

SPOUTN

34

MIP

33

MIN

R535

HSMICINP

IC410

DCX81

AGND

AGND

AGND

AGND

AGND

AGND

MICBIAS

AGND

AGND

AGND

AGND

C515

C516

C517

R517

R518

R519

R520

C521

C522

C523

C524

C526

C527

C528

DG

DG

DG

DG

D515

D516

D517

HSMIP

HSMIN

HSSPOUT

JK501

1
2
3
4

5

L463

L464

L465

R564

C570

C518

C513

C514

R515

R516

C525

C519

C520

R574

DG

Handset Jack

36

HSMIP

35

HSMIN

41

HSSPOUTP