Service Manual for KENWOOD KDC8020

B51-7868-00 (S) 3420

SERVICE MANUAL

CD RECEIVER

KDC-5019/519/8020

KDC-7021/7021Y/B7021

This service manual does not include information on the CD mechanism assembly (exploded view, parts list,

schematic diagram or mechanism operation description).

For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X

: B51-7867-00).

Front glass

(B10-4157-01)

Panel assy

(A64-2578-02)

Front glass

(B10-4158-01)

Panel assy

(A64-2579-02)

KDC-5019

KDC-519

Front glass

(B10-4162-01)

Panel assy

(A64-2583-02)

Front glass

(B10-4160-01)

Panel assy

(A64-2581-02)

KDC-8020

KDC-7021/Y

Front glass

(B10-4163-01)

Panel assy

(A64-2584-02)

KDC-B7021

DC cord

(E30-4942-05)

: KDC-7021Y

(E30-4956-05)

: KDC-7021/B7021

Antenna adaptor

(T90-0523/0534-05)

KDC-7021/7021Y/B7021 only

Screw set

(N99-1704-05)

Screw set

(N99-1722-05)

Bracket (L)

(J19-5051-03)

KDC-5019/519/8020 only

Bracket (R)

(J19-5052-03)

Lever

(D10-4562-04)x2

(D10-4621-04)x2: KDC-7021/B7021

Mounting

hardware assy

(J21-9716-03)

Torsion

coil spring

(G01-2924-04)

Plastic

cabinet assy

(A02-1497-13)

Remote

controller assy

(A70-2025-05)

Remote controller assy

(A70-0886-15)

Escutcheon

(B07-3010-02)

DC cord

(E30-4940-05)

: KDC-5019/519

DC cord

(E30-4939-05)

: KDC-8020

q

KDC-5019/519/7021/7021Y/8020/B7021

2

BLOCK

DIAGRAM

PLL+B

FM+B

Q43,44

Q45,46

AM+B

DIMMER

MUTE

2WAY

DET.

ACC

BU DET.

A8V

Q4-6

IC3

Q9

Q7,8

Q10-13

SERVO AVR

SERVO+B

SW5V

Q3

Q50,51

Q30

Q1,2

SW5V

BU5V

P CON

ANT-CON

Q26-29

MUTE

IC8

Q32,33,35

DRIVER

MUTE

Q37-40

POWER IC

IC4

SYSTEM MI-COM

CD

CH

F/E

A1,Q53

E-VOL

IC2

PRE OUT

SP-OUT

DIMMER

TEL-MUTE

ACC

ANT-CONT

Q24,25

P-CONT

BACK UP

A-CONT

P-CONT

DECODER

RDS

IC1

IC14

Q52

EX.AMP CONTROL

ILLUM

+B

RESET

SW

RESET IC

IC16

IC2

IC1

Q7

Q3,4

Q5

LCD

DRIVER

REMO

G/R SW

DIMMER

SW

BUFFER

NOISE

Q36

OUTPUT VOLTAGE

CONTROL

EX.AMP

Q14

Q15

Q31

(E,Z) TYPE

(K,M) TYPE

NAVI-MUTE

PANEL 5V

KEY

MATRIX

SW14V

SRM

MECHA.

SRM

DRIVER

MOTOR

(BACK LIGHT)

LCD

ED1

CH

QU

A

L

SERVO+B

MUTE R

STOP

SW2

LO/EJ

MUTE L

RST

SW3

SW1

SDA

SCL

A8V

BU5V

SW5V

RST

REQ C

CLK

CH-CON

DATA H

REQ H

CD

AM

FM

P MUTE

MUTE

SW5V

PANEL5V

L

D

ATA

L

CE

L

CLK

L

D

ATA

S

DIMMER

REMO

RESET

ILL+B

SRM

SW1

SRM

DET

SRM

SW2

SRM

SW3

SRM

SUB-

SRM

SUB+

RDCK

RDD

A

QU

A

L

SD

A

SCL

AFS

A8V

PLL DATA

PLL CLK

IFC OUT

S-METER

SW5V

DATA C

BACK UP

BU5V

PANEL 5V

CHANGER

AM

FM

230mV

1200mV

251mV (E,Z) TYPE

470mV (K,M) TYPE

AUDIO OUT

NOISE

CD

3600mV

855mV

1372mV

3600mV

600mV

1800mV

DRIVER

MUTE

MO SW

LCD

AVR

(X16- )

IC15

(E,Z) TYPE

(K,M) TYPE

(E,Z) TYPE

KDC-5019/519/7021/7021Y/8020/B7021

3

COMPONENT DESCRIPTION

q SWITCH UNIT(X16-154X-XX, X16-1892-7X)

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

IC1

LC75808W

LCD driver with key matrix

IC2

RS-171

Remote sensor IC

Q1

DTA114EUA or KRA302 Key permission SW

For the key scanning start and the key detection SW

Q3

2SC4081

Red LED SW

When a base goes Hi, RED LEDs are turned on.

Q4

2SC4081

Green LED SW

When a base goes Hi, GREEN LEDs are turned on.

Q5

2SC4081

VLCD AVR

For LCD driver IC

Q6

DTA114EUA or KRA302 REMO SW

While a base goes Lo, PAN 5V is supplied to the Remote sensor IC.

Q7

DTC143ZK

Dimmer SW

Usually Q7's base goes Hi. When DIMMER mode is selected, pulse

wave shape is applied to Q7's base.

q ELECTRIC UNIT(X25-939X-XX, X25-8762-7X)

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

IC1

UPD703033GC139

System MI-COM.

IC2

TDA7407D

E.VOL & N.C.MPX IC

IC3

M5237ML

AVR IC

IC is combined with Q4, and it works as the error detection, the driver.

IC4

TA8273H

Power IC

HD74HC02FP

IC8

or TC74HC02AF

Mute logic

2-input NOR x 4

or 74VHC02SJ

IC14

TDA7479D

RDS decoder

IC15

LB1930M

Motor driver IC

IC16

S-80837ANNP

Reset IC

When BU 5V voltage is less than 3.7V, IC outputs Lo.

Q1

2SB1548(P)

BU 5V AVR

While BACKUP is applied, AVR outputs +5V.

Q2

2SC4081 or 2SD1819A

Q1 and Q2 are inverted Darlington connection.

Q3

2SA1576A or 2SB1218A SW 5V

While a base goes Lo, SW 5V is supplied to the microprocessor

peripheral circuits.

Q4

2SB1548(P)

A8V AVR

Q4 is combined with IC3, and it outputs +8.3V.

Q5

DTC144EUA or UN5213

A8V AVR SW

A8V AVR ON/OFF control

Q6

DTA124EUA or KRA303

While Q5's base goes Hi, Q6 is turned on, and A8V AVR is working.

Q7

DTA124EUA or KRA303

A8V AVR and SERVO +B AVR ON/OFF control

Q8

DTC144EUA or UN5213

SW14V SW

While Q8's base goes Hi, Q7 is turned on, A8V AVR and SERVO +B

AVR are working.

Q9

2SD2375

SERVO +B AVR

When Q9's base goes Hi, SERVO +B AVR outputs +7.6V.

Q10

2SB1184

ILL +B AVR

While Q11's base goes Hi, AVR outputs +10.7V.

Q11

2SC4081 or 2SD1819A

Works during POWER ON mode with a panel attached to the set.

Q12

DTC144EUA or UN5213

ILL +B SW

ILL +B AVR ON/OFF control

Q13

DTA124EUA or KRA303

While Q12's base goes Hi, Q13 is turned on, and ILL +B AVR is working.

Q14

DTA123JK or KRA105S EXT. AMP CON. SW

When a base goes Lo, Q14 is turned on, and control pulse waveform

shape is outputted.

Q15

DTC144EUA or UN5213 Small lamp detection SW

When vehicle small lamps turn on, Q15 is turned on .

Q24

DTC114YUA or UN5214

ANT-CON. SW

When Q24's base goes Hi, Q25 is turned on.

Q25

2SB1277(Q,R)

Works during the tuner reception mode.

Q26

2SB1277(Q,R)

P-CON SW

When Q29's base goes Hi, Q26 is turned on .

Q29

DTC114YUA or UN5214

Works during POWER ON mode.

Q27

2SA1576A or 2SB1218A

P-CON. protection SW

Protect Q26 by turning ON when P-CON output is grounded.

Q28

DTA124EUA or KRA303 P-CON. protection inhibit SW

Prevents Q27 tuning ON during start-up after power ON.

While BACKUP is applied, a base goes Hi, and Q30 is turned on.

Q30

2SC4081 or 2SD1819A BU detection SW

When momentary power down has detected, a base goes Lo, and

Q30 is turned off.

Q31

2SC4081 or 2SD1819A

ACC detection SW

While ACC is applied, a base goes Hi, and Q31 is turned on.

Q32

DTA124EUA or KRA303 Mute driver for L Ch.

When BU detection SW or System RESET or MI-COM.'s Pre-mute is

Q33

DTA124EUA or KRA303 Mute driver for R Ch.

working, a base goes Lo, and Q32 and Q33 are turned on.

Q35

DTC124EUA or UN5212 E. VOL mute SW

When BU detection SW or MI-COM.'s mute is working, a base goes

Hi, and Q35 is turned on.

Q36

2SC4081 or 2SD1819A Noise buffer

KDC-5019/519/7021/7021Y/8020/B7021

4

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

Q37

DTC143TUA or KRC410 Audio mute SW (Front L)

When Q37's base goes Hi, Pre-output is muted.

Q38

DTC143TUA or KRC410 Audio mute SW (Front R) When Q38's base goes Hi, Pre-output is muted.

Q39

DTC143TUA or KRC410 Audio mute SW (Rear L)

When Q39's base goes Hi, Pre-output is muted.

Q40

DTC143TUA or KRC410 Audio mute SW (Rear R)

When Q40's base goes Hi, Pre-output is muted.

Q43

DTC124EUA or UN5212

FM +B SW

When Q43's base goes Hi, Q44 is turned on, and A8V is supplied to the F/E.

Q44

2SB1277(Q,R)

Works during FM reception mode.

Q45

DTC124EUA or UN5212

AM +B SW

When Q45's base goes Hi, Q46 is turned on, and A8V is supplied to the F/E.

Q46

2SB1277(Q,R)

Works during AM reception mode.

Q50

DTC144EUA or UN5213

PAN 5V SW

While a panel is attached to the set, Q50 and Q51 are turned on, and

Q51

2SA1576A or 2SB1218A

BU 5V is supplied to the panel.

Q52

2SC4081 or 2SD1819A

Composite signal output buffer

Q53

DTC144EUA or UN5213

IFC buffer

Waveform shaping

KDC-5019/519/7021/7021Y/8020/B7021

5

MICROCOMPUTER'S TERMINAL DESCRIPTION

q IC1(ELECTRIC UNIT : X25-939X-XX, X25-8762-7X)

Pin No.

Pin Name

I/O

Description

Processing Operation

1

AM+B

O

AM+B control

Hi: During AM reception

2

FM+B

O

FM+B control

Hi: During FM reception, Hi: During FM reception

if with RDS, RDBS

3

AFS

O

Noise detection time constant switching terminal

Hi: During FM reception, Lo: During FM seek or

AF search

4

PLL-DATA

I/O Data input/output with F/E

5

PLL-CLK

I/O Clock output to F/E

6

EVDD

-

Positive power supply connection terminal

Connected to BU 5V lines.

7

EVSS

-

Ground connection terminal

Connected to GND lines.

8

N.C.

O

Not used(N.C.)

9

BEEP

O

BEEP sound output

10

REMO

I

Data input from the remote control light sensor

11

PRE-MUTE L

O

Pre-out mute control (L)

When M MUTE L input is Lo during CD source

selected, PRE MUTE L outputs Lo.

12

PRE-MUTE R

O

Pre-out mute control (R)

When M MUTE R input is Lo during CD source

selected, PRE MUTE R outputs Lo.

13

IC2-SDA

I/O Data line with IC2,CD mechanism MI-COM.

14

IC2-CLK

O

Clock line with IC2,CD mechanism MI-COM.

15,16 N.C.

O

Not used(N.C.)

17

DA-SDA / DIM-CON

O

Data output to D/A converter(V-LED model)

Data line with D/A converter

/ Dimmer control output

/ Hi: Dimmer OFF, Pulse wave shape: Dimmer ON

18

TEST

-

Test terminal

Not used(Connected to GND lines)

19

P-MUTE

O

Power IC mute control output

Lo: Mute (during POWER OFF, ALL OFF, TEL

MUTE)

20

P-STBY

O

Power IC standby control output

Lo: Power IC OFF, Hi: Power IC ON, ALL OFF

mode

21

MUTE

O

IC2 mute control output

OPEN(Hi): Mute ON, Lo: Mute OFF

22,23 N.C.

O

Not used(N.C.)

24

ACC-DET

I

ACC detection terminal

Lo: ACC ON, Hi: ACC OFF

25

DIMMER

I

Small lights detection input

Lo: During vehicle small lamps turn on.

26

SW5V

O

SW 5V control output

Lo: POWER ON mode

Bass boost OFF__Hi: 160msec, Lo: 40msec

27

EXT-AMP-CONT

O

External amp. control output

Bass boost LOW__Hi: 130msec, Lo: 70msec

Bass boost HI__ Hi: 100msec, Lo: 100msec

28

P-CON

O

Power control output

Lo: POWER OFF mode, Hi: POWER ON mode

29

ANT-CON

O

Antenna control output

Hi: During TUNER mode or TI reception

30

P-ON

O

SW 14V control output

Hi: POWER ON mode

31

RESET

I

Reset input terminal

Lo: System reset

32

XT1

I

Sub clock resonator connection terminal

Clock count during POWER OFF mode

33

XT2

-

Sub clock resonator connection terminal

34

REGC

-

Capacitor conection terminal for regulator inside

microprocessor

Oscillation: POWER ON mode, Oscillation stop:

35

X2

-

Main clock resonator connection terminal

POWER OFF mode or momentary power down

detected

36

X1

I

Main clock resonator connection terminal

37

VSS

-

Ground connection terminal

Connected to GND lines.

38

VDD

-

Positive power supply connection terminal

Connected to BU 5V lines.

39

CLKOUT

O

Internal system clock output

Not used(N.C.)

40,41 N.C.

O

Not used(N.C.)

42

TYPE0

I

Destination type selection terminal 0

43

TYPE1

I

Destination type selection terminal 1

44

TYPE2

I

Destination type selection terminal 2

45

N.C.

O

Not used(N.C.)

46

IC2 TYPE0

I

IC2 setting terminal

Lo: Initial value

47

IC2 TYPE1

I

IC2 setting terminal

Lo: Initial value

48

CH-REQH

O

Request output to changers

Lo: Request

KENWOOD KDC8020 Service Manual

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