Kenwood KDC-2023, KDC-2024-SA, KDC-2024, KDC-2024-SG, KDC-2024-SYA Service manual

...

2002-11 PRINTED IN JAPAN

B53-0004-00 (N)3379

COMPACT

RDMLOUD REPSCAN

OFF

KDC-222

CRSC

AMEAUTOADJCLK

AUD

45Wx4

COMPACT

RDMLOUD REPSCAN

OFF

KDC-2024S

MONO

AMEAUTOADJCLK

AUD

45Wx4

COMPACT

DIGITAL AUDIO

RDMLOUD REPSCAN

OFF

KDC-XXXX

CRSC

AMEAUTOADJCLK

AUD

50Wx4

CD MD-Changer Control

M. RDM

COMPACT

RDMLOUD REPSCAN

OFF

KDC-2094

MONO

CLK

AUD

45Wx4

WIDE BAND

DIGITAL AUDIO

Depends on model. Refer to the parts list

AMEAUTOADJ

Panel assy (A64-2867-02): KDC-222 (A64-2868-02): KDC-222S

Escutcheon (B07-3060-02): KDC-222 (B07-3022-02): KDC-222S

Panel assy (A64-2878-02): KDC-2024SA/SG/SYA/SYG

Panel assy (A64-2870-02): KDC-2023 (A64-2873-02): KDC-3023

Escutcheon (B07-3001-02): KDC-2023 (B07-3022-02): KDC-3023

Panel assy (A64-2884-02): KDC-2094YA/YG

Escutcheon (B07-3001-02): KDC-2094YA/YG

Escutcheon (B07-3001-02): KDC-2024SA/SG/SYA/SYG

DC cord (E30-4784-05)

Mounting hardware assy (J21-9716-03)

DC cord(ISO) (E30-4790-05)

Plastic cabinet assy (A02-1486-13)

Lever (D10-4589-04)x2

Screw set (N99-1719-05)

Screw set (N99-1610-15)

Antenna adaptor (T90-0523-05)

CD RECEIVER

KDC-2023 KDC-2024

SA/SG/SYA/SYG KDC-2094YA/YG KDC-222/S KDC-3023

SERVICE MANUAL

CD mechanism operation description is not in this sarvice manual. Please, refer to sarvice manual X92-4030-0x (B51-7867-00).

CD mechanism extension cord : WO5-0618-00

KDC-2023, 2024A/SG/SYA/SYG, 2094YA/YG, 222/S,3023

BLOCK DIAGRAM

1200mV

CD : 3600mV CH : 3600mVAM(E) : 855mV

FM(E) : 1372mV

FM(J,K) : 1800mV AM(J,K) : 600mV

CHANGER

KEY MATRIX

WITH

LCD DRIVER

LCD

REMOCON

MI-COM

ANT

AM AGC

FM AGC

DECODER

RDS

RESET IC

EEP-ROM

TUNER,MPX & E-VOL.

SUPPLY IC

SW5V

SERVO

P-ANT

P-CON

POWER

MUTE LOGIC

DET

ACC

BU DET

MUTE

PRE

POWER IC

ACC

BACK

OUT

PRE

IC1

DATA H

MUTE

DATA C

REQ H

CH-CON

AUDIO OUT

CLK

REQ C

RST

BACK UP

BU5V

IC2

SW5V

LO/S

RST

LOE/LIM

LO/EJ

STOP

MUTE

8EJE

SDA

SCLK

AUDIO OUT

12EJE

Q501

Q502

AM+B

FM+B

AM AGC OUT

IC6

CH CD

SERVO BU5V

A8V

TUNER OUT

BU5V

IC11

IC12

IC10

FM AGC OUT

A8V

SW2

SW1

ILLUMI

VCC

BU5V

AUDIO+B

AM+B

FM+B

BACK LIGHT

KEY ILLUMI

Q51,55

SW5V

Q50

SERVO

BU5V FM+B

AM+B

A8V

P-CON

P-ANT

IC8

Q20

Q10

IC7

MUTE

Q223,224

IC4

KDC-2023, 2024A/SG/SYA/SYG, 2094YA/YG, 222/S,3023

● SWITCH UNIT (X16-1460-xx/2370-12)

COMPONENTS DESCRIPTION

Ref.No.

Application/Functions Operation/Condition/Compatibility

IC1 LCD driver & key matrix IC2 Remote Sencer

Q1 Key scan start When Q1 base goes Lo, key scan start.

● ELECTRIC UNIT (X25-9600-xx/9612-7x)

Ref.No.

Application/Functions Operation/Condition/Compatibility

IC1 System control µ-com System µ-com IC4 Power amplifire E-Vol output encoder power amplification for speaker. IC7 Power supply (Multi AVR) -

When a pin 1, 2, or 13 is "H", MUTE turns on

IC8 MUTE Logic When a pin 3, 4, or 5 is "H", P-AMP mute turns ON.

Changer is RESET when a pin 9, 10, or 11 is "L". IC10 Tuner & E-Vol. FM/AM tuner & stereo decoder & E-Vol. IC11 Power on reset When B.U. 5V voltage is less than 3.5V, power reset. IC12 E2P-ROM Writing and read-out of adjustment data for a tuner

Q10 B.U. detector BU on (base "H") : Collector "H" Q20 A.C.C detector ACC ON (base : "H") : Collector "L" Q40 MUTE driver Base "L" : Mute on (collector "L") Q50 SW 5V Base "L" : SW5V on Q51 SERBO AVR control Pin 2 "H" : Serbo on (pin 4 "H") Q55 SERBO AVR Base "H" : Serbo on

Q70 Surge detector Base "H" : Surge detect Q101 DSI driver Base "H" : DSI on Q102 PANEL 5V SW Panel attch : PAN5V on

Q223,224

MUTE Base "H" : Mute on Q501 AM RF amplifire Base "H" : Gain UP Q502 FM RF amplifire Gate "H" :Gain UP

KDC-2023, 2024A/SG/SYA/SYG, 2094YA/YG, 222/S,3023

MICROCOMPUTER'S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER uPD780058GCxxx (X25 : IC1)

Pin No. Name I/O Description Processing Operation

1 TDF DET I Panel detection H:Panel detached L:Panel attached 2 8EJE SW I

H:Eject is completed

Except 8cm CD model:always output L 3 NC O Not used (out put L) 4 Avss

H:Panel detached L:RESET 5 L-RST O LCD driver RESET ∆3 normal H , Power off L

When 7seg model,output L 6 L-CE O LCD driver selection

H:Select (panel communication)

When panel attached,output L 7 AVREF1 8 NC Not used (connected to 9pin) 9 IC10-DATA I/O IC10,E2PROM data communication ∆3 non communication : H

10 IC10-CLK O IC10,E2PROM clock communication ∆3 non communication : H

Non communication : H

11 L-DATAL I Data input from the LCD driver When panel detached : L

∆3 Pull down on X25 unit,Pull up on X16 unit

12 L-DATAS O Data output to the LCD driver When panel detached , output L 13 L-CLK O Clock output to the LCD driver When panel detached , output L 14 R-DATA I Data input from the RDS Except RDS model : output L 15 R-QUAL I Quality input from the RDS Except RDS model : output L 16 CH-DATAC I Data input from the changer (new 5L) Except changer model : output L

17 CH-DATAH O Data output to the changer (new 5L)

When non communication ,last data keeping

Except changer model : output L

18 CH-CLK I/O Clock input/output with the Changer (new 5L)

Check the old and new

Except changer model : output L

19 CH-REQH O Request output to the changer (new 5L)

L:Requset

Except changer model : output L

20 NC O Not used (output L) 21 AFS O

Noise detection time constant switching terminal

H:Normal L:FM/AM seek and AF search

∆3 (When tuner SRC auto zero , L)

22-24 NC O Not used (output L)

25 CH-CONT O Changer control

H:Changer on L:Changer off

Except changer model : output L

26 TYPE REF O 5V lines output for destination setting H:During destination reading 27 SD I Tuner SD input H:Station detected 28 NC O Not used (output L) 29 TYPE2 I Destination type selection terminal 2 Refer to destination type list. 30 TYPE1 I Destination type selection terminal 1 Refer to destination type list. 31 TYPE0 I Destination type selection terminal 0 Refer to destination type list. 32 TUNER-TYPE1 I Destination available/genuine model rool off H:genuine model 1 L:available model 33 Vss1 34 TUNER-TYPE0 I

Destination available/genuine model noise cancel

H:genuine model 0 L:available model

35 MUTE O Mute (E.Vol,Preset) control

H:mute on L:mute off

Power off after that 15 second L

36 M-DATA I/O Data input/output with the CD mechanism ∆3 non communication : H 37 M-CLK O Clock output to the CD mechanism ∆3 non communication : H

When adjustment = H

38 ADJ O Tuner lines adjustment PS1-0,1=L PS1-2,2-0,1=Hi-z

IC10-DATA,CLK=Hi-z

39 P-MUTE O Power IC mute control

H:mute off L:mute on

Power off after that 15 second H

40 SVR O Power IC servo control

H:When momentary power down detected

L:Nomal

41 P-STBY O Power IC standby control H:Power IC ON L:Power IC OFF 42 SW5V O

SW 5V control H:SW5V OFF L:SW5V ON

Power off after that 10 second H

KDC-2023, 2024A/SG/SYA/SYG, 2094YA/YG, 222/S,3023

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin No. Name I/O Description Processing Operation

43 B.U-DET I Back up detection terminal H:power down L:B.U. on 44 ACC-DET I ACC detection terminal H:ACC OFF L:ACC ON

45 PS1-0 O

Power supply IC SW1 control 0 Audio 8V,P-CON

46 PS1-1 O

Power supply IC SW1 control 1 Audio 8V,P-CON

47 PS1-2 O Power supply IC SW1 control 2 P-ANT

Power supply IC SW2 control 0

48 PS2-0 O

ILL,FM,AM

Power supply IC SW2 control 1

49 PS2-1 O

ILL,FM,AM

50 BEEP BEEP

H:Light on L:Light off

51 DSI O DSI control

When panel attached,output L When panel detached,flashing at the panel (H/L)

FIX model is output L 52 NC O Not used (out put L) 53 NC O Not used (out put L) 54 LOE/LIM SW I CD mechanism down&limit detection H:Chucking detection L:Normal 55 MO SW O CD mechanism loading motor control output H:Loading,Eject,Break L:Play 56 LO/EJ I/O

CD mechanism loading/Eject switching terminal

H:Eject L:Loading 57 M-STOP O Stop output to the CD mechanism H:Play L:Stop 58 M-RST O Reset output to the CD mechanism H:Normal L:CD mechanism reset 59 M-MUTE I Mute input from the CD mechanism H:mute off L:mute on 60 RESET Reset input from the System microcomputer 61 REMO I Remote control input 62 R-CLK I RDS clock input Except RDS model : output L

H:Changer detection 63 CH-REQC I Request input from the changer (new 5L) L:Request

Except Changer model : output L 64 LOS SW I CD mechanism loading's switch detected

H:No disc

L:DISK IN(Loading Start) 65 KEY-REQ I

Key input detected H:Key no input

(11pin L connected to the DATA L) L:Key input (edge key data reading start) 66 12EJE SW I 12cm disc detected L:12cm disc 67 Vss0 68 VDD1 69 X2 ∆3 MAIN X'tal oscillating circuit ∆3 4.19MHz X'tal connection 70 X1 ∆3 MAIN X'tal oscillating circuit ∆3 4.19MHz X'tal connection 71 IC TEST 72 XT2 Not used OPEN 73 XT1 74 VDD0 VDD Connected to VDD

75 AVREF0

A/D converter reference voltage control output,

connection to the 80pin AVCONT 76 S-METER I S-meter input 77 NOISE I FM noise detection input ∆3

2.5V or greater:NAVI MUTE

78 PHONE I 2way mute 1.0V or less:TEL MUTE

Except phone mute model : output L

79 NC O Not used (out put L) 80 AVCONT O A/D converter standard voltage control output

H:During A/D converter active same timing with PON

BA4911 SW1 Power supply IC output

PS1-2 PS1-1 PS1-0 A8V P-CON P-ANT

L L L STANBY LL(H)H(L)ON OFF OFF L H H ON ON OFF H H H ONONON

BA4911 SW2 Power supply IC output

PS2-1 PS2-0

ILLUMI

FM AM

L L STANBY

L(H)H(L)ON ON OFF

H H ON OFF ON

+ 9 hidden pages