KENWOOD KDC-5019, KDC-7021Y, KDC-B7021 Service Manual

CD RECEIVER

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

SERVICE MANUAL

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).

KDC-5019 KDC-519

Front glass (B10-4158-01)

Panel assy (A64-2579-02)

B51-7868-00 (S) 3420

Front glass (B10-4157-01)

Panel assy (A64-2578-02)

KDC-8020 KDC-7021/Y

KDC-B7021

Remote controller assy (A70-2025-05)

Front glass (B10-4160-01)

Front glass (B10-4163-01)

Plastic cabinet assy (A02-1497-13)

Panel assy (A64-2581-02)

Panel assy (A64-2584-02)

Torsion coil spring (G01-2924-04)

KDC-5019/519/8020 only

Escutcheon (B07-3010-02)

Mounting hardware assy (J21-9716-03)

Front glass (B10-4162-01)

Bracket (L) (J19-5051-03)

Screw set (N99-1704-05)

Panel assy (A64-2583-02)

Screw set (N99-1722-05)

Bracket (R) (J19-5052-03)

KDC-7021/7021Y/B7021 only

Remote controller assy (A70-0886-15)

DC cord (E30-4940-05) : KDC-5019/519

DC cord (E30-4939-05) : KDC-8020

DC cord (E30-4942-05) : KDC-7021Y (E30-4956-05) : KDC-7021/B7021

Antenna adaptor (T90-0523/0534-05)

Lever (D10-4562-04)x2 (D10-4621-04)x2: KDC-7021/B7021

PLL+B

FM+B

Q43,44 Q45,46

AM+B

DIMMER

MUTE

2WAY

DET.

ACC

BU DET.

A8V

Q4-6

IC3

Q7,8

Q10-13

SERVO AVR

SERVO+B

SW5V

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

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

RESET

RESET IC

IC16

IC2

IC1

Q3,4

LCD DRIVER

REMO

G/R SW

DIMMER SW

BUFFER

NOISE

Q36

OUTPUT VOL TA GE

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

QUAL

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

P MUTE

MUTE

SW5V

PANEL5V

L DATAL

L CE

L CLK

L DATAS

DIMMER

REMO

RESET

ILL+B

SRM SW1

SRM DET

SRM SW2

SRM SW3

SRM SUB-

SRM SUB+

RDCK

RDDA

QUAL

SDA

SCL

AFS

A8V

PLL DATA

PLL CLK

IFC OUT

S-METER

SW5V

DATA C

BACK UP

BU5V

PANEL 5V

CHANGER

230mV

1200mV

251mV (E,Z) TYPE

470mV (K,M) TYPE

AUDIO OUT

NOISE

CD 3600mV

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

BLOCK DIAGRAM

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

COMPONENT DESCRIPTION

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

Ref.No. Component Name Application/Function Operation/Condition/Compatibility

IC1 LC75808W IC2 RS-171 Remote sensor IC

Q1 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

Q7 DTC143ZK Dimmer SW

DTA114EUA or KRA302

● 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) Q2

Q3 Q4 2SB1548(P) A8V AVR Q4 is combined with IC3, and it outputs +8.3V.

Q5 Q6

Q7 Q8

Q9 2SD2375 SERVO +B AVR When Q9's base goes Hi, SERVO +B AVR outputs +7.6V. Q10 2SB1184 Q11 Q12 Q13

Q14 Q15

Q24 Q25 2SB1277(Q,R) Works during the tuner reception mode. Q26 2SB1277(Q,R) Q29 Q27 Q28

Q30

Q31 Q32 Q33

Q35 Q36

2SC4081 or 2SD1819A 2SA1576A or 2SB1218A

DTC144EUA or UN5213 DTA124EUA or KRA303

DTA124EUA or KRA303 DTC144EUA or UN5213

2SC4081 or 2SD1819A DTC144EUA or UN5213 DTA124EUA or KRA303

DTA123JK or KRA105S DTC144EUA or UN5213

DTC114YUA or UN5214

DTC114YUA or UN5214 2SA1576A or 2SB1218A DTA124EUA or KRA303

2SC4081 or 2SD1819A

2SC4081 or 2SD1819A DTA124EUA or KRA303 DTA124EUA or KRA303

DTC124EUA or UN5212 2SC4081 or 2SD1819A

LCD driver with key matrix

Key permission SW For the key scanning start and the key detection SW

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

Usually Q7's base goes Hi. When DIMMER mode is selected, pulse wave shape is applied to Q7's base.

BU 5V AVR

SW 5V

A8V AVR SW

SW14V SW While Q8's base goes Hi, Q7 is turned on, A8V AVR and SERVO +B

ILL +B AVR

ILL +B SW

EXT. AMP CON. SW Small lamp detection SW ANT-CON. SW

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

P-CON. protection inhibit SW

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

ACC detection SW While ACC is applied, a base goes Hi, and Q31 is turned on. Mute driver for L Ch. When BU detection SW or System RESET or MI-COM.'s Pre-mute is Mute driver for R Ch. working, a base goes Lo, and Q32 and Q33 are turned on.

E. VOL mute SW Noise buffer

While BACKUP is applied, AVR outputs +5V. Q1 and Q2 are inverted Darlington connection. While a base goes Lo, SW 5V is supplied to the microprocessor peripheral circuits.

A8V AVR ON/OFF control While Q5's base goes Hi, Q6 is turned on, and A8V AVR is working. A8V AVR and SERVO +B AVR ON/OFF control

AVR are working.

While Q11's base goes Hi, AVR outputs +10.7V. Works during POWER ON mode with a panel attached to the set. ILL +B AVR ON/OFF control While Q12's base goes Hi, Q13 is turned on, and ILL +B AVR is working. When a base goes Lo, Q14 is turned on, and control pulse waveform shape is outputted. When vehicle small lamps turn on, Q15 is turned on . When Q24's base goes Hi, Q25 is turned on.

When Q29's base goes Hi, Q26 is turned on . Works during POWER ON mode.

Prevents Q27 tuning ON during start-up after power ON. While BACKUP is applied, a base goes Hi, and Q30 is turned on.

Q30 is turned off.

When BU detection SW or MI-COM.'s mute is working, a base goes Hi, and Q35 is turned on.

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

Ref.No. Component Name Application/Function Operation/Condition/Compatibility

Q37 Q38

Q39 Q40 Q43 Q44 2SB1277(Q,R) Works during FM reception mode. Q45 Q46 2SB1277(Q,R) Works during AM reception mode. Q50 Q51 Q52 Q53

DTC143TUA or KRC410 DTC143TUA or KRC410 DTC143TUA or KRC410 DTC143TUA or KRC410 DTC124EUA or UN5212

DTC124EUA or UN5212

DTC144EUA or UN5213 2SA1576A or 2SB1218A 2SC4081 or 2SD1819A DTC144EUA or UN5213

Audio mute SW (Front L) Audio mute SW (Front R) Audio mute SW (Rear L) Audio mute SW (Rear R)

FM +B SW

AM +B SW

PAN 5V SW Composite signal output buffer

IFC buffer Waveform shaping

When Q37's base goes Hi, Pre-output is muted. When Q38's base goes Hi, Pre-output is muted. When Q39's base goes Hi, Pre-output is muted. When Q40's base goes Hi, Pre-output is muted. When Q43's base goes Hi, Q44 is turned on, and A8V is supplied to the F/E.

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

While a panel is attached to the set, Q50 and Q51 are turned on, and BU 5V is supplied to the panel.

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

MICROCOMPUTER'S TERMINAL DESCRIPTION

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

Pin No.

15,16 N.C. O Not used(N.C.)

22,23 N.C. O Not used(N.C.)

40,41 N.C. O Not used(N.C.)

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

3 AFS O Noise detection time constant switching terminal 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

PRE-MUTE R

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.

DA-SDA / DIM-CON 18 TEST - Test terminal Not used(Connected to GND lines) 19 P-MUTE O Power IC mute control output

20 P-STBY O Power IC standby control output 21 MUTE O IC2 mute control output OPEN(Hi): Mute ON, Lo: Mute OFF

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

EXT-AMP-CONT

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 -

35 X2 - Main clock resonator connection terminal POWER OFF mode or momentary power down

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.)

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

O Pre-out mute control (L)

O Pre-out mute control (R)

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

O External amp. control output Bass boost LOW__Hi: 130msec, Lo: 70msec

Capacitor conection terminal for regulator inside microprocessor

Hi: During FM reception, Hi: During FM reception if with RDS, RDBS Hi: During FM reception, Lo: During FM seek or AF search

When M MUTE L input is Lo during CD source selected, PRE MUTE L outputs Lo. When M MUTE R input is Lo during CD source selected, PRE MUTE R outputs Lo.

Lo: Mute (during POWER OFF, ALL OFF, TEL MUTE) Lo: Power IC OFF, Hi: Power IC ON, ALL OFF mode

Bass boost OFF__Hi: 160msec, Lo: 40msec

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

Oscillation: POWER ON mode, Oscillation stop:

detected

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

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin No.

66-69 N.C. O Not used(N.C.)

84,85 N.C. I Not used(pull down to GND lines)

Pin Name I/O Description Processing Operation

49 CH-RST O Reset output to changers : Reset 50 CH-MUTE I Mute request from changers Hi: Mute request 51 CH-CON O Changer control Lo: Standby mode, Hi: Operation mode 52 ILL-ON O Illumination AVR on/off control output Hi: POWER ON mode except panel detached 53 M-MUTE L I 54 M-MUTE R I 55 BVDD - Positive power supply connection terminal Connected to BU 5V lines. 56 BVSS - Ground connection terminal Connected to GND lines. 57 M-RST O Reset output to CD mechanism MI-COM. Lo: Reset 58 M-STOP O Stop request to CD mechanism MI-COM. Lo: Stop mode, Hi: Operation mode 59 N.C. O Not used(N.C.) 60 LO/EJ I/O CD mechanism loading/Eject switching output Lo: Loading, Hi: Eject, Hi-Z: Stop or Break 61 MOSW O CD mechanism loading motor control output Hi: CD loading/eject action or Break, Lo: other 62 N.C. O Not used(N.C.) 63 CD-SW3 I Down & limit switch detection input Hi: Chucking, Lo: Pickup most inner position 64

DA-SDA/NC

65 LCE O CE output to LCD driver IC

70 AV CONT O A/D converter reference voltage control output Hi: Active, Connected to AVREF terminal 71 AVDD 72 AVSS - A/D converter ground connection terminal Connected to GND lines. 73 AVREF I A/D converter reference voltage input terminal 74 PHONE I PHONE detection input 75 SRM-SW3 I Mask mechanism position SW3 input Panel: (SW1,SW2,SW3)=(Lo,Lo,Hi)

76 SRM-SW1 I Mask mechanism position SW1 input 77 SRM-SW2 I Mask mechanism position SW2 input Mask : (SW1,SW2,SW3)=(Lo,Lo,Lo)

78 SRM-DET I Mask mechanism detection input 79 NOISE I FM noise detection input 80 S-METER I S-meter input from F/E

81 R-DATA I Data input from the RDS decoder IC

82 R-QUAL I Quality input from the RDS decoder IC 83 IFC-OUT I F/E IFC OUT input terminal Lo: Station detected, Hi: Not detected

86 SRM-B O SRM mechanism submotor control output

87 R-CLK I Clock input from the RDS decoder IC 88 CH-REQC I Request input from changers Lo: Request

89 KEY-REQ I Communication request from LCD driver IC 90 CD-SW1 I Loading SW detection input Lo: Loading start 91 CD-SW2 I 12cm disc detection SW input Lo: 12cm disc detected 92 SRM+B O SRM mechanism submotor control output

93 BU-DET I Momentary power down detection input 94 CH-DATAC I Data input from changers

95 CH-DATAH O Data output to changers 96 CH-CLK I/O Clock input/output with changers 97 L-DATA L I Data input from the LCD driver IC 98 L-DATA S O Data output to the LCD driver IC

99 L-CLK I/O

100 PAN5V O Panel 5V control Hi: Panel attached, Lo: Panel detached

Mute request (L Ch.) from CD MECHA. MI-COM. Mute request (R Ch.) from CD MECHA. MI-COM.

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

A/D converter positive power supply connection terminal

Clock output to the LCD driver IC /Panel detaching detection input(LCD Driver) Lo: Panel attached

Lo: Mute request Lo: Mute request

Lo: Panel detached, momentary power down detected

Connected to BU 5V lines.

1V or less: TEL MUTE, 2.5V or greater: NAVI MUTE

Angle: (SW1,SW2,SW3)=(Hi,Hi,Lo) Eject: (SW1,SW2,SW3)=(Hi,Hi,Hi)

Lo: Mechanism detected, Hi: mechanism not detected

Except RDS, RBDS model: Not used(pull down to GND lines) Except RDS, RBDS model: Not used(pull down to GND lines)

Standby: (SRM+B,SRM-B)=(Lo,Lo) Clock wise: (SRM+B,SRM-B)=(Hi,Lo) Counter clock wise: (SRM+B,SRM-B)=(Lo,Hi) Break: (SRM+B,SRM-B)=(Hi,Hi) Except RDS, RBDS model: Not used(pull down to GND lines)

Hi : When momentary power down detected or BU OFF Lo : BU ON

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