Kenwood KDC-319, KDC-4019, KDC-5020 Service manual

CD RECEIVER

KDC-319/4019

SERVICE MANUAL

KDC-5020

The following reference numbers with accessory parts are the same reference numbers used on EXPLODED VIEW and PARTS LIST.

213

256

276

200

222

Refer to the service manual "X92-4430-0x" (B51-7889-00) for MECHANISM information.

RC1

277

KDC-319 (K)

KDC-319

KDC-4019 (K)

KDC-4019

KDC-5020 (M)

KDC-5020

DC1

CD MECHA

F/E

FM+B

PLL+B

AM+B

BUFF

E-VOL

SYSTEM u-COM

DECODER

RDS

RST IC

DET

FLIP

POSI

MATRIX

KEY

G/R SW

RST SW

REMO ON

BACKLIGHT

LCD

W-ILL

DRIVER

LCD

REMO

GUIDE ILL SW

OPEN

B.U.5VSW 5V

SERVO +B

PANEL

2WAY MUTE

ACC DET.

DIMMER

TEL-MUTE

ACC

DIMMER

POWER IC

SP-OUT

MUTE

PRE-OUT (FRONT)

PRE-OUT (REAR)

MUTE

PRE-OUT (NF/REAR)

MUTE

DRIVER

OP-AMP

SWITCHED

PROTECTION

THERMAL

NOISE BUFFER

B.U. DET.

SW 14

A 8V

ILLUMI +B

EJECT ILL/DSI (SW AND LED)

EJECT KEY

X89-252

X89-251

BACK UP

ANT-CON

P-CON

Q1,2

Q3,4

IC7

IC1

& N.C. MPX

IC2

IC8

Q906 S1

ED1

IC2

IC1

Q708

Q706,707

Q901-903

Q501

Q502

Q703 Q701,702

Q905

Q503,504

Q505-508

IC5

Q402

Q403,404

IC4

Q205,206

Q201-204

IC3,

(NORMAL)

DET

FLIP

LCD (NEGA)

MATRIX

KEY

G/R SW

RST SW

REMO ON

BACKLIGHT

LCD

W-LED

DRIVER

LCD

REMO

ED1

IC2

IC1

X16-163 X16-167

X16-164

Q6 Q2

Q3,4

LCD NEGA

KDC-319/4019/5020

KDC-5020R/5021Y/YV

KDC-419/X459

KDC-5021/5021V/506

5x7 TYPE 14SEG TYPE

DATA C

CH-CON

DATA H

REQ H

RST

CLK

REQ C

SERVO+B

PLL DATA

PLL CLK

M STOP

M RST

MUTE L

LO/EJ

MOSW

SW2 SW3

SW1

S-METER

IFC OUT

SW 5V

PANEL DET

GUIDE ILL

MP IN

AFS

LEVEL

RDDA

A 8V

B.U.5V

A 8V

SW 5V

SDA

SCL

AUDIO OUT

BACK UP

REMO

RESET

B.U.5V

MUTE DRIVER

PANEL 5V

AM+B

FM+B

S-METER

RDCK

RQUAL

B.U.5V

FLIP DET

L DATA S

L CE

L CLK

L DATA L

L-RES(L-INH)

EJECT

EJECT ILLUMI/DSI

ILL ON

SW 5V

(E) TYPE(K,M) TYPE

CD (NORMAL)

3600mVCHANGER 3600mV

3600mV 1800mV

600mV

FM AM

1372mV

855mV

3600mV

B.U.5V

QUAL

S-MUTE

REAR L/R

FRONT L/R

AFS

NOISE

N/F SW

PRE MUTE

N/F MUTE

P MUTE

MUTE

BEEP

B.U.5V

MUTE DRIVER

P-ON

PANEL 5V

SW 5V

CH-AUX

MODE

PRE OUT OUTPUT VOLTAGE

PANEL 5V

DIMMER

PWM CONTROL

DIMMER

1.8V PRE

251mV (E)

470mV (K,M)

230mV

1200mV

KDC-319/4019,5020

BLOCK DIAGRAM

ELECTRIC UNIT (X25-921x-xx)

REF.

No.

FUNCTION OPERATION

IC1 SYSTEM u-COM System u-com. IC2 E-VOL/NC/MPX E-volume, Noise Chancellor, Multiplexer. IC3 MUTE 4 inputs, 3 NOR gates. IC4 POWER IC Power IC. IC5 SWITCHING OP AMP Switches operation amplifier. IC7 RDS DEMODULATOR Demodulates RDS. IC8 RESET IC "L" when detection voltage goes below 3.0V. IC9 EEPROM EEPROM.

Q1 FM+B SW Q1 turns on when Q2 base level goes "H". Q2 FM+B SW Turns on when FM signal exists. Q3 AM+B SW Q3 turns on when Q4 base level goes "H". Q4 AM+B SW Turns on when AM signal exists.

Q6 IFC BUFFER Shapes wave form. Q201 PRE MUTE SW (FRONT Lch) Mutes when the base level goes "H". Q202 PRE MUTE SW (FRONT Rch) Mutes when the base level goes "H". Q203 PRE MUTE SW (REAR Lch) Mutes when the base level goes "H". Q204 PRE MUTE SW (REAR Rch) Mutes when the base level goes "H". Q205 PRE MUTE SW (NON-FADER Lch) Pre mute SW. Q206 PRE MUTE SW (REAR Rch) Pre mute SW. Q401 E-VOL MUTE SW Mutes E-vol when the base level goes "H". Q402 NOISE BUFFER Buffers noise.

Q403,404 AUDIO MUTE DRIVER Turns on when the base level goes "L".

Q501

BU & MOMENTARY POWER DOWN DETECTOR

Turns on when the base level goes "H" during the back-up effects.

Q502 ACC DETECTOR Turns on when the base level goes "H" during ACC effects.

Q503,504 P-ANT SW Q503 turns on when Q504 base level goes "H".

Q505 P-CON SW Q505 turns on when Q508 base level goes "H".

Q506 P-CON PROTECTOR

Q507 P-CON PROTECTOR

Q508 P-CON SW Q505 turns on when Q508 base level goes "H". Q510 SMALL LAMP DETECTOR Turns on when the base level goes "H" during illumination lights.

Q701,702 BU 5V AVR Turns on when the back-up effects.

Q703 SW 5V Turns on when the base level goes "L".

Q704,705 AUDIO 8V & SERVO +B AVR ON/OFF SW Q704 turns on when Q705 base level goes "H". Q706,707 AUDIO 8V AVR Output voltage is 8.3V.

Q708 SERVO +B AVR Output voltage is 7.4V.

Q901-903 ILLUMINATION AVR AVR output turns on when Q901 base level goes "H".

Q905 PANEL 5V SW Turns on when the base level goes "L". Q906 GUIDE ILLUMI SW Turns on when the base level goes "L". Q907 EJECT KEY & DSI ILLUMI SW Turns on when the base level goes "L".

KDC-319/4019,5020

COMPONENT DESCRIPTION

Protects Q505 by Q506 turning on when P-CON output effect stops.

Prevents Q507 turning on during being stand-by after turning power on.

KDC-319/4019,5020

SWITCH UNIT (X16-163x-xx)

REF.

No.

FUNCTION OPERATION

IC1 LCD DRIVER Drives LCD. IC2 REMOTE CONTROLLER Controls the unit.

Q1 KEY SCAN START Turns on when the base level goes "L".

Q2 IC2 POWER SUPPLY SW Turns on when the base level goes "L".

Q3 KEY GREEN ILLUMI SW Turns on when the base level goes "H".

Q4 KEY RED ILLUMI SW Turns on when the base level goes "H".

COMPONENT DESCRIPTION

KDC-319/4019,5020

MICROCOMPUTER'S TERMINAL DESCRIPTION

(X25-) IC1 : u-COM

PORT

No.

1 TYPE 0 I Destination switch. 2 TYPE 1 I Destination switch. 3 FLIP DET I Panel open/close detection. "H" : Panel opened. "L" : Panel closed. 4 AVSS - GND. 5 PANEL DET I Panel presence detection. "H" : Panel does not exists. "L" : Panel exists. 6 E2P DET I EEPROM presence detection. "H" : ROM exists. "L" : ROM does not exist. 7 AVREF 1 I Reference voltage. To BU 5V. 8 CH DATA C I Data from the changer. -

9 CH DATA H O Data to the changer. 10 CH CLK I/O Clock signal from or to the changer. 11 L DATA L I Data from LCD driver. Max 600KHz communication speed. 12 L DATA S O Data to LCD driver. Max 1.2MHz communication speed. 13 L CLK O Clock signal to LCD driver. 14 L CE O LCD driver enable. "H" : Driver selected. "L" : Driver non-selected. 15 BEEP O Buzzer. 16 PLL DATA I/O Data from or to the front-end. 17 L RST O LCD driver reset. "L" : Reset. 18 PLL CLK O Clock signal to the front-end. -

19 GUIDE ILLUMI O Guide illumination control.

20 EJECT ILLUMI/DSI O EJECT/DSI illumination control.

21 PANEL I/O Panel power supply control. "L" : Panel exists, ACC turns off. 22 LO/EJ I/O CD-mecha/Loading/Eject switch. "L" : Loading. "H" : Eject. 23 MOSW O CD-mecha/Motor switch. "H" : Loading, eject, breaking. 24 M MUTE I Lch mute request from CD mechanism. "L" : Mute. 25 - - - 26 M STOP O Stop request to CD mechanism. "L" : Mechanism stop. "H" : CD playing. 27 M RST O CD mechanism reset. "L" : Reset. 28 CD DOWN I CD down switch detection. "H" : Chucking.

29 ILLUMI ON O Illumination power control.

30 IC2 TYPE 1 I IC2 destination switch. "L" : Pure KENWOOD brand. "H" : Genuine. 31 P-ON I/O SW 5V control. "L" : P-ON turns on. 32 IC2 CLK O Clock signal to IC2 or CD mechanism. 33 VSS 1 - GND. 34 IC2 DATA I/O Data from or to IC2 or CD mechanism. 35 R QUAL I RDS QUAL. "L" : Model without RDS. 36 R DATA I RDS data. "L" : Model without RDS.

37 AFS O Noise detection time constant switch.

38 IC2 TYPE 0 I IC2 destination switch. "L" : Pure KENWOOD brand. "H" : Genuine. 39 AM+B O AM power supply. "H" : AM signal receiving. 40 FM+B O FM power supply. "H" : FM signal receiving. 41 CH MUTE I Mute request from the changer. "H" : Mute effects. 42 CH RST O Reset signal to the changer. "H" : Reset. 43 CH REQ H O Request to the changer. "L" : Requesting. 44 CH CON O Changer control. "H" : Changer controlled. 45 DIMMER CONT O Dimmer control. "H" : Dimmer turns on. 46 MUTE O Mute. "H" : Mute effects. 47 N/F MUTE O Non-fader preout mute. "L" : Mute effects. 48 PRE MUTE I/O Front/Rear preout mute. "L" : Mute effects. 49 REMOTE I Remote control. -

PORT NAME I/O FUNCTION OPERATING CONDITION

"L": Illumination turns on. "H" : Illumination turns off. "L" : Illumination turns on. "H" : Illumination turns off.

"H" : Illumination turns on. "L" : Illumination turns off.

"L" : FM seeking, AF searching. "H" : Signal receiving.

KDC-319/4019,5020

MICROCOMPUTER'S TERMINAL DESCRIPTION

(X25-) IC1 : u-COM

PORT

No.

50 N/F SW O Non-fader switch. "H" : Rear. "L" : Front. 51 P MUTE O Power IC mute. "L" : Power off, all off. 52 SVR O SVR control. "H" : Discharging. 53 P STBY O Power IC stand-by control. "H" : Power IC turns on. 54 ANT CONT O Antenna control. "H" : Tuner or the traffic information turns on. 55 P CON O Power control. "H" : Power turns on. 56 BU DET I Back-up detection. "L" : Back-up effects. 57 ACC DET I ACC detection. "L" : ACC effects. 58 DIMMER I Dimmer detection. "L" : Dimmer turns off. 59 - - - 60 RESET I System u-com reset. "L" : Reset. 61 EJECT I Eject key. "L" : Key turns on. 62 CH REQ C I Request from the changer. "L" : Requesting. 63 R CLK I RDS clock. "L" : Model without RDS. 64 KEY REQ I Panel key interruption. "L" : Key requesting. 65 12cm DISC I 12cm DISC detection switch. "L" : 12cm disc exists. 66 LOAD SW I Loading switch detection. "L" : Loading starts. 67 VSS - GND. 68 VDD - VDD. 69 X2 - Main clock. Oscillates during turning power on. 70 X1 I mail clock. 71 TEST I Program power supply. 72 XT2 - Sub clock. 73 XT1 I Sub clock. 74 VDD - VDD. 75 AVDD - Analogue VDD. 76 S METER I Tuner S-meter voltage. 77 NOISE I Noise detection. 78 PHONE I Phone detection. TEL MUTE : Below 1V. NAVI MUTE : Over 2.5V. 79 IFC I IFC. "H" : Station signal exists. 80 TYPE 2 I Destination switch. -

PORT NAME I/O FUNCTION OPERATING CONDITION

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