Service Manual for KENWOOD KDC-422

KDC-4022

OFF

NF

-

+

DAB

F.SEL

M.RDM

REP

SCAN

RDM

AUD

C.S.

MENU

NAME.S

DISP

AUTO

AME

Front glass

(B10-4303-01 : KDC-422)

(B10-4326-01 : KDC-4022)

Panel assy

(A64-2823-02 : KDC-422 )

(A64-2853-02 : KDC-4022)

KDC-6023

OFF

NF

-

+

DAB

F.SEL

M.RDM

REP

SCAN

RDM

AUD

MENU

NAME.S

DISP

AUTO

GSM

Front glass

(B10-4309-01 : KDC-6023)

Panel assy

(A64-2832-02 : KDC-6023)

Escutcheon

(B07-3022-02)

Plastic cabinet assy

(A02-1486-13)

Mounting hardware assy

(J21-9716-03)

Screw set

(N99-1730-15)

Lever

(D10-4589-04)

Depends on model. Refer to the parts list.

DC cord

(E30-4940-05)

Remote controller assy(RC-505)

(A70-2040-05)

Screw set

(N99-1719-15)

Not supplied

Remote controller assy(RC-410)

(A70-2026-05)

·CD MECHANISM OPERATION DESCRIPTION is not in this sevice manual.

Please refer to service manual for X92-4450-0X (B51-7889-00).

CD mechanism extension cord (24PIN) : W05-0934-00

B53-0023-00 (N) 1724

CD RECEIVER

KDC-4022

KDC-422

KDC-6023

SERVICE MANUAL

KDC-4022/422/6023

2

BLOCK

DIAGRAM

BUFFER

Q101

RDS

DECODER

IC7

Q201

BUFFER

EEPROM

IC10

IC1

(V-ILL ONLY)

DA CONVERTER

IC3

IC2

REMOCON

RESET SW

ENCODER

ROTARY

S24

WITH

LCD DRIVER

KEY MATRIX

IC1

LCD

PANEL DET

S1

EJECT SW

S1

EJECT ILLUMI

DSI

u-COM

IC2

MPX

E-VOL

&

EXT AMP

DIMMER

ACC DET

TEL MUTE

B.U DET

PRE MUTE

DRIVER

MUTE

IC6

POWER

IC

IC4

THERMAL

PROTECT

PRE OUT

(REAR/NF)

EXT.AMP.CON

DIMMER

ACC

TEL MUTE

BACK UP

AUX IN

(REAR) 3PRE

PRE OUT

(FRONT)

PRE OUT

SP OUT

SURGE DET

SW REG

CD MECHA+B

SERVO

SERVO+B

SW 14V

Q21

IC9

OPEL DISP I/F

WIRED REMO/

SUPPLY

IC

IC3

POWER

ANT DET

P CON

RESET

IC8

SW 5V

Q4

PANEL 5V

Q152

SW5V

S-METER

AUDIO OUT

IFC OUT

PLL-DATA

PLL-CLK

SW5V

AM+B

A8V

SW3

SW2

SW1

MS CLK

MS DATA

M MUTE L

SW4

M MUTE R

LO/EJ

M STOP

MOSW

M RST

SERVO+B

A8V

BU5V

CD MECHA+B

DATA C

CH MUTE

CH RST

REQ H

REQ C

CH CLK

CH-CON

DATA H

BUCK UP

NOISE

QUAL

S-METER

R

DA

T

A

R

CLK

FM

AM

MP IN

LEVEL

CD

QUAL

AFS

CH

SW5V

BU5V

P

ANEL

DET

EJECT

DSI

L

CLK

L

D

ATA

S

L

C

E

L

D

ATA

L

VOL

A

VOL

B

REMO

V

DA

T

A

V

CLK

O-CE

O-DA

T

A

O-CLK

PRE MUTE

MUTE

P-MUTE

EXT.AMP.CON

DIMMER

PHONE

ACC DET

B.U DET

BEEP

PS1-0

PS1-1

PS1-2

PS2-0

PS2-2

RST

FREE

REAR

FRONT

BU5V

BUCK UP

A8V

AUX

SW5V

BACK UP

AM+B

FM+B

ILLUMI

A8V

BU5V

TUNER

CD

EX.CH

SWITCH UNIT (X16- )

DAUGHTER UNIT

(X89- )

KDC-4022/422/6023

3

q CD PLAYER UNIT (X32-5400-00)

COMPONENTS DESCRIPTION

Ref.No.

Component Name

Application/Functions

Operation/Condition/Compatibility

IC1

AN22002AA

RF amplifier adapted for CD-RW

Generation of RF signal based on the signals from the APC circuit and

pickup, and generation of servo error (focusing error and tracking error)

signals. Detection of dropout, anti-shock, track crossing and off-track

conditions, included gain control function during CD-RW.

IC2

MN6627771KP

CD signal processor built-in MI-COM

Focusing, tracking, sled and spindle servo processing. Automatic

adjustment (focusing, tracking, gain, offset and balance) operations.

Digital signal processing (DSP, PLL, sub-codes, CIRC error correction,

audio data Interpol ration) operations, and Microcomputer function.

IC3

BA5824FP

4CH BTL driver

Focusing coil, tracking coil, spindle motor and sled motor driver, disc

loading and eject operation.

IC4

NJM4580M1

Low pass filter

2nd low pass filter for audio signals.

Q1

MCH6101

APC

LD power control.

Q2

2SA1362(Y)

D.5V SW

When P ON signal gose"L", Q2 is ON.

Q3

DTC124EUA

Q4 SW

When P ON signal gose"L" (SW+5V AVR is ON), Q3 is ON.

Q4

DTA143XUA

A.8V SW

When P ON signal gose"L" (Q3 is ON), Q4 is ON.

Q5

2SC4081

Current driver

Current driver.

Q6

2SA1576A

Current driver

Current driver.

D1

DAN202U

Protection diode

Laser diode protection.

D2

MA8051-L

Zener diode

DAC AVR/LPF reference voltage (A.5V).

D3

DA204U

Current driver

Current driver.

q ELECTRIC UNIT (X25-9800-11/12/21)

Ref.No.

Component Name

Application/Functions

Operation/Condition/Compatibility

IC1

UPD703030GC013

System microcomputer

Control for TUNER unit, CD mechanism, volume & tone, LCD driver and

external CD changer unit

IC2

TDA7411

Electronic volume & N.C.MPX

Control for source selector, volume & tone, and FM multiplex detector.

IC3

BA4911-V4

Power supply IC

Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con).

IC4

TA8273H

Audio power amp IC

Amplifier for audio signal to derive for 4channel speakers (50W maximum

for each channel).

IC6

HD74HC27FP

Muting control IC

Control for timing for mute.

IC8

PST3436UL

Reset IC

When detection voltage goes below 3.5V or less Reset IC output change

to "L" signal.

Q1

2SC4081

Serge detection

When backup voltage become more than 24V output is "L" (momentary

power down) / When backup voltage become less than 24V output is "H".

Q2

2SC4081

Backup detection

When BU voltage supplied output is "L" / When BU voltage not supplied

or momentary power down is detected output is "H".

Q3

2SC4081

ACC detection

When ACC voltage supplied output is "L".

Q4

2SA1036K

SW 5V

When base voltage is "L" Q4 is ON.

Q21

2SD2375

AVR

Servo regulator.

Q22

UMC2N

SW

Servo SW.

Q23

UMC2N

IC control

Power supply IC controller.

Q31

UN5213

Dimmer control

When base voltage is "H" dimmer is ON.

SW1

OUT

1.5-3.0V

Audio ON

3.5-5.0V

Audio, P-con ON

7.0V-

Audio, P-con, P-ant ON

SW2

2.0-3.0V

Illumination, FM ON

4.0V-

Illumination, AM ON

KDC-4022/422/6023

4

COMPONENTS DESCRIPTION

Ref.No.

Component Name

Application/Functions

Operation/Condition/Compatibility

Q151

UN5114

DSI driver

When base voltage level is "L" DSI LED is light up / When base voltage

level is "H" DSI LED turns off / When panel assy is pull off, cut off the

supply to panel 5V AVR.

Q152

2SA1576A

Panel 5V SW

When panel assy attached to the unit, Q152 base goes "L" and supply to

panel 5V AVR to panel assy .

Q153

UN5213

Illumination control

When Q153 base voltage to "H", illumination is light up.

Q154

2SA1577

Illumination control

When Q153 base voltage to "H", illumination is light up.

Q201

UN5216

Buffer amp

Noise buffer amp.

Q350

UN5112

Pre & NF mute SW

When base voltage to "L", drive to pre & NF mute SW(Q351,355,357).

Q351

UN5216

Pre mute SW

When base voltage to "H", muting to the pre Lch or NF Lch line.

Q352

UN5216

Pre mute SW

When base voltage to "H", muting to the pre Rch or NF Rch line.

Q354

UN5112

Pre & NF mute SW

When base voltage to "L", drive to pre & NF mute SW(Q32,356,358).

Q355

UN5216

Pre mute SW

When base voltage to "H", muting to the front Lch line.

Q356

UN5216

Pre mute SW

When base voltage to "H", muting to the front Rch line.

q SWITCH UNIT (X16-2020-10/12)

Ref.No.

Component Name

Application/Functions

Operation/Condition/Compatibility

IC1

LC75808W

LCD driver

Drive for LCD unit.

IC2

PNA4S22M

Remote control IC

Receiving for the remote control unit.

Q1

2SC4081

VLCD AVR

When base voltage level goes 7.9V Q1 is ON.

Q2

DTA114EUA

Remo. ON SW

When base voltage level goes "L" the power supply IC2 is turned "ON".

Q3

2SC4081

key illumination SW

Lights up for green key illumination when base voltage level goes "H".

Q4

2SC4081

key illumination SW

Lights up for red key illumination when base voltage level goes "H".

Q5

2SC4081

Dimmer control SW

Lights up for LCD back light when base voltage level goes "H".

KDC-4022/422/6023

5

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin No.

Name

I/O

Description/Processing Operation

1

PLL CLK

O

CLK output terminal to Front End

2

N.C

-

Open

3

PANEL DET

I

Panel assy detect terminal ( Panel assy come off : L)

4

IC2 SDA

I/O

Control Data input / output terminal for electric volume, CD mechanism

5

IC2 SCL

O

Clock DATA output terminal for electric volume, CD mechanism

6

VDD

-

Power supply input terminal (BU 5V)

7

VSS

-

GND

8

FLIP-DET

I

Panel assy open detect terminal (panel close : L )

9

BEEP

O

Beep audio signal output terminal

10

REMO

I

Remote control signal input terminal

11

R QUAL

I

RDS decoder QUAL signal input terminal

12

R DATA

I

RDS decoder Data signal input terminal

13

L CE

O

CE output for LCD driver IC

14

VILL DATA

O

Variable illumination DATA out put terminal for D/A converter

15

VILL CLK

O

Valuable illumination CLK out put terminal for D/A converter

16

DSI

O

Disc guide illumination control terminal

17

DIM CON

O

Dimmer control terminal

18

TEST

-

Test terminal

19

ILL CON

O

Illumination control terminal

20

VOL A

I

Volume key input terminal

21

VOL B

I

Volume key input terminal

22

MOSW

O

CD mechanism motor IC control output terminal (Loading,eject ,brake :L )

23

LO/EJ

O

CD mechanism loading / eject control terminal

24

M STOP

O

Request signal (Mechanism is STOP) output to CD mechanism (active L)

25

M RST

O

Reset signal output to CD mechanism (active L)

26

MUTE

O

Muting signal output terminal

27

LOE/LIM SW

I

Down SW detection from CD mechanism

28

M-MUTE L

I

Request for muting signal from CD mechanism (Mute request : L )

29

M-MUTE R

I

Request for muting signal from CD mechanism (Mute request : L )

30

PANEL 5V

O

Control for Panel5V AVR

31

RESET

I

Reset terminal (Active : L )

32

XT1

I

Sub clock input terminal (32.768KHz)

33

XT2

I

Sub clock input terminal (32.768KHz)

34

REGC

-

Regulator output terminal

35

X2

I

Main clock input terminal (20MHz)

36

X1

I

Main clock input terminal (20MHz)

37

VSS

-

GND

38

VDD

-

Power supply input terminal (BU 5V)

39

NC

-

Open

40

IC2 TYPE1

I

Electric volume condition setting terminal

41

IC2 TYPE0

I

Electric volume condition setting terminal

42

TYPE2

I

Destination setting terminal

43

TYPE1

I

Destination setting terminal

44

TYPE0

I

Destination setting terminal

45

CD MECHA+B

O

AVR control for CD mechanism ( For MP3 AVR ON :L )

46

SW 5V

O

Control terminal for SW5V AVR (ON : L , OFF : Hi-Z)

47

PS2-0

O

Power supply IC control terminal

48

PS2-1

O

Power supply IC control terminal

49

PS1-0

O

Power supply IC control terminal

50

PS1-1

O

Power supply IC control terminal

q IC1: ELECTORIC UNIT (X25-9800-11/12/21)

KENWOOD KDC-422 Service Manual

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