CD RECEIVER

KDC-2023 KDC-2024SA/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).
Panel assy (A64-2867-02): KDC-222 (A64-2868-02): KDC-222S Escutcheon (B07-3060-02): KDC-222 (B07-3022-02): KDC-222S
2002-11 PRINTED IN JAPAN B53-0004-00 (N) 3379
CD mechanism extension cord : WO5-0618-00
Panel assy (A64-2870-02): KDC-2023 (A64-2873-02): KDC-3023
Escutcheon (B07-3001-02): KDC-2023 (B07-3022-02): KDC-3023

KDC-222

COMPACT DIGITALAUDIO

COMPACT DIGITAL AUDIO

KDC-XXXX

CD MD-Changer Control

CRSC LOUD SCAN RDM REP CLK ADJ AUTO AME LOUD SCAN RDM REP M. RDM CLK ADJ AUTO AME
Panel assy (A64-2878-02): KDC-2024SA/SG/SYA/SYG
Escutcheon Panel assy (B07-3001-02): KDC-2024SA/SG/SYA/SYG (A64-2884-02): KDC-2094YA/YG
Escutcheon (B07-3001-02): KDC-2094YA/YG

KDC-2024S

COMPACT

KDC-2094

WIDE BAND

DIGITALAUDIO

MONO LOUD SCAN RDM REP CLK ADJ AUTO AME LOUD SCAN RDM REP CLK ADJ AUTO AME

DC cord (E30-4784-05)

DC cord(ISO) (E30-4790-05)
Mounting hardware assy (J21-9716-03)
Plastic cabinet assy (A02-1486-13)

Lever (D10-4589-04)x2

Antenna adaptor (T90-0523-05)

Screw set (N99-1719-05)

Screw set (N99-1610-15)
Depends on model. Refer to the parts list

TUNER OUT

1200mV
LCD DRIVER WITH KEY MATRIX

REMOCON

BACK LIGHT

KEY ILLUMI

FM+B Q502 A8V IC10 FM AGC OUT Q223,224
KDC-2023, 2024A/SG/SYA/SYG, 2094YA/YG, 222/S,3023

FM AGC

AM+B Q501

PRE MUTE

FM(J,K) : 1800mV FM(E) : 1372mV AM(J,K) : 600mV AM(E) : 855mV

CD : 3600mV CH : 3600mV

PRE OUT

AM AGC CD

SERVO A8V BU5V

AM AGC OUT

TUNER,MPX & E-VOL.

POWER IC

MUTE LOGIC

SP OUT

AUDIO OUT 12EJE LO/S SCLK SDA 8EJE MUTE RST STOP LO/EJ MO LOE/LIM

BU DET

BACK UP

BLOCK DIAGRAM

EEP-ROM

BU5V IC11

RDS DECODER

ACC DET

RESET IC

POWER SUPPLY IC

P-CON P-ANT Q51,55

CHANGER

AUDIO OUT RST REQ C CLK DATA H CH-CON REQ H DATA C MUTE BACK UP BU5V IC2 SW5V

P-CON P-ANT

MI-COM

VCC SW1 SW2

Q50 SW5V

BU5V FM+B AM+B A8V

BU5V FM+B AM+B AUDIO+B ILLUMI

COMPONENTS DESCRIPTION

q SWITCH UNIT (X16-1460-xx/2370-12)

Ref.No.

IC1 IC2 Q1

Application/Functions

LCD driver & key matrix Remote Sencer Key scan start
Operation/Condition/Compatibility
When Q1 base goes Lo, key scan start.
q ELECTRIC UNIT (X25-9600-xx/9612-7x)
IC1 IC4 IC7 IC8 IC10 IC11 IC12 Q10 Q20 Q40 Q50 Q51 Q55 Q70 Q101 Q102 Q501 Q502
System control -com Power amplifire Power supply (Multi AVR) MUTE Logic Tuner & E-Vol. Power on reset E2P-ROM B.U. detector A.C.C detector MUTE driver SW 5V SERBO AVR control SERBO AVR Surge detector DSI driver PANEL 5V SW AM RF amplifire FM RF amplifire System -com
E-Vol output encoder power amplification for speaker. When a pin 1, 2, or 13 is "H", MUTE turns on 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". FM/AM tuner & stereo decoder & E-Vol. When B.U. 5V voltage is less than 3.5V, power reset. Writing and read-out of adjustment data for a tuner BU on (base "H") : Collector "H" ACC ON (base : "H") : Collector "L" Base "L" : Mute on (collector "L") Base "L" : SW5V on Pin 2 "H" : Serbo on (pin 4 "H") Base "H" : Serbo on Base "H" : Surge detect Base "H" : DSI on Panel attch : PAN5V on Base "H" : Mute on Base "H" : Gain UP Gate "H" :Gain UP

Q223,224 MUTE

MICROCOMPUTER'S TERMINAL DESCRIPTION
q SYSTEM MICROCOMPUTER uPD780058GCxxx (X25 : IC1)
Pin No. 21 Name TDF DET 8EJE SW NC Avss L-RST L-CE AVREF1 NC IC10-DATA IC10-CLK L-DATAL L-DATAS L-CLK R-DATA R-QUAL CH-DATAC CH-DATAH CH-CLK CH-REQH NC AFS I/O I I O Not used (out put L) H:Panel detached L:RESET 3 normal H , Power off L When 7seg model,output L H:Select (panel communication) When panel attached,output L Panel detection Description Processing Operation H:Panel detached L:Panel attached H:Eject is completed Except 8cm CD model:always output L

LCD driver RESET LCD driver selection Not used (connected to 9pin) IC10,E2PROM data communication IC10,E2PROM clock communication Data input from the LCD driver Data output to the LCD driver Clock output to the LCD driver Data input from the RDS Quality input from the RDS Data input from the changer (new 5L) Data output to the changer (new 5L) Clock input/output with the Changer (new 5L) Request output to the changer (new 5L) Not used (output L)
I/O O I O O I I I O I/O O O O O O O I O I I I I I O I/O O O O O O O
3 non communication : H 3 non communication : H Non communication : H When panel detached : L 3 Pull down on X25 unit,Pull up on X16 unit When panel detached , output L When panel detached , output L Except RDS model : output L Except RDS model : output L Except changer model : output L When non communication ,last data keeping Except changer model : output L Check the old and new Except changer model : output L L:Requset Except changer model : output L
22-24 NC CH-CONT TYPE REF SD NC TYPE2 TYPE1 TYPE0 TUNER-TYPE1 Vss1 TUNER-TYPE0 MUTE M-DATA M-CLK ADJ P-MUTE SVR P-STBY SW5V
H:Normal L:FM/AM seek and AF search Noise detection time constant switching terminal 3 (When tuner SRC auto zero , L) Not used (output L) H:Changer on L:Changer off Changer control Except changer model : output L 5V lines output for destination setting H:During destination reading Tuner SD input H:Station detected Not used (output L) Destination type selection terminal 2 Refer to destination type list. Destination type selection terminal 1 Refer to destination type list. Destination type selection terminal 0 Refer to destination type list. Destination available/genuine model rool off H:genuine model 1 L:available model Destination available/genuine model noise cancel H:genuine model 0 L:available model H:mute on L:mute off Mute (E.Vol,Preset) control Power off after that 15 second L Data input/output with the CD mechanism 3 non communication : H Clock output to the CD mechanism 3 non communication : H When adjustment = H Tuner lines adjustment PS1-0,1=L PS1-2,2-0,1=Hi-z IC10-DATA,CLK=Hi-z H:mute off L:mute on Power IC mute control Power off after that 15 second H H:When momentary power down detected Power IC servo control L:Nomal Power IC standby control H:Power IC ON L:Power IC OFF SW 5V control H:SW5V OFF L:SW5V ON Power off after that 10 second H
Pin No. Name 43 B.U-DET 44 ACC-DET PS1-0 PS1-1 PS1-2 PS2-0 I/O I I O O O O Description Back up detection terminal ACC detection terminal Power supply IC SW1 control 0 Audio 8V,P-CON Power supply IC SW1 control 1 Audio 8V,P-CON Power supply IC SW1 control 2 P-ANT Power supply IC SW2 control 0 ILL,FM,AM Power supply IC SW2 control 1 ILL,FM,AM BEEP O O O I O I/O O O I I I I I I I DSI control Not used (out put L) Not used (out put L) CD mechanism down&limit detection CD mechanism loading motor control output CD mechanism loading/Eject switching terminal Stop output to the CD mechanism Reset output to the CD mechanism Mute input from the CD mechanism Reset input from the System microcomputer Remote control input RDS clock input Request input from the changer (new 5L) CD mechanism loading's switch detected Key input detected (11pin L connected to the DATA L) 12cm disc detected H:Light on L:Light off When panel attached,output L When panel detached,flashing at the panel (H/L) FIX model is output L Processing Operation H:power down L:B.U. on H:ACC OFF L:ACC ON

BA4911 SW1 PS1-2 PS1-1 PS1-0 L L L L L(H) H(L) L H H H H H BA4911 SW2
PS2-1 L L(H) H PS2-0 L H(L) H
Power supply IC output A8V P-CON P-ANT STANBY ON OFF OFF ON ON OFF ON ON ON

Power supply IC output

ILLUMI ON ON FM STANBY ON OFF AM OFF ON
PS2-1 BEEP DSI NC NC LOE/LIM SW MO SW LO/EJ M-STOP M-RST M-MUTE RESET REMO R-CLK CH-REQC LOS SW KEY-REQ 12EJE SW Vss0 VDD1 X2 X1 IC XT2 XT1 VDD0 AVREF0 S-METER NOISE PHONE NC AVCONT
H:Chucking detection L:Normal H:Loading,Eject,Break L:Play H:Eject L:Loading H:Play L:Stop H:Normal L:CD mechanism reset H:mute off L:mute on
Except RDS model : output L H:Changer detection L:Request Except Changer model : output L H:No disc L:DISK IN(Loading Start) H:Key no input L:Key input (edge key data reading start) L:12cm disc
3 MAIN X'tal oscillating circuit 3 MAIN X'tal oscillating circuit TEST Not used
3 4.19MHz X'tal connection 3 4.19MHz X'tal connection OPEN

I I I O O

VDD Connected to VDD A/D converter reference voltage control output, connection to the 80pin AVCONT S-meter input FM noise detection input 3 2.5V or greater:NAVI MUTE 2way mute 1.0V or less:TEL MUTE Except phone mute model : output L Not used (out put L) H:During A/D converter active A/D converter standard voltage control output same timing with PON
q MECHANISM MICROCOMPUTER MN6627771KP (X32 : IC2)
Pin No. 51 Name TVD SPL PC PWM TBAL FBAL NRFDET OFT BDO LDON DSLB DVDD1 DVSS1 AVSS2 DSLF ARF RFSW PLLF PLLF2 IREF RFENV TRCRS TE FE AVDD2 AVSS1 OUTR AVDD1 OUTL DVSS3 CSEL NC ASEL MSEL0 MSEL1 ICRST BCLK LRCK SRDATA VREFP HOT 8EJE_SW 12EJE/SDET_SW LOE/LIM_SW PCK EFM SENSE CLVS DEMPH DVDD2 X1 I/O O O O O O O I I I O O I/O I I I/O I/O I I I I I O O I O I I I O O O O I I I I I O O O O O I Description Traverse driver output (PWM output) Spindle motor drive output (PWM output) Spindle motor ON output multi-purpose PWM output Tracking balance adjust output (PWM output) Focus balance adjust output (PWM output) RF detection signal input Off-track signal input Drop out signal input Laser on signal output H:ON DSL balance output Power supply for digital circuit Ground lines for digital circuit Ground lines for analog circuit Loop filter terminal for DSL RF signal input When DSL circuit,constant switch terminal Loop filter terminal for PLL Loop filter characteristic switching terminal for PLL Standard voltage input terminal RF envelope signal input Track cross signal input Tracking error signal input Focusing error signal input Power supply for analog circuit Ground lines for analog circuit Rch audio output Power supply for analog circuit Lch audio output Ground lines for digital circuit Oscillation frequency specification terminal Not used Audio output polarity switching terminal Destination type selection port (set 2bit) Destination type selection port (set 2bit) Reset control terminal for external DAC Bit clock output for serial data L/R identification signal output Sirial data output A/D converter standard power supply input Temperature protection detection terminal (AD input) 8cm disc eject stop detection terminal Judge the 8cm or 12cm disc Pick-up inside detected PLL extracted clock output,etc EFM signal output,etc Optics servo status signal output,etc Spindle servo phase synchronous signal output,etc Dephase detection signal output,etc Power supply for digital circuit Main clock input terminal Processing Operation

L:ON H:OFF (default ) It's possible to setup the TOSF2
L:detected H:detected H:detected When command FO on,LDON is H
For DSL,PLL and AD The bias of ARF output terminal in one
Analog input Analog input Analog input Analog input For DSL,PLL and AD For audio output (Lch and Rch in one) For audio output (Lch and Rch in one)
H:33.8488MHz L:16.9344MHz L:Reverse H:Non reverse Order "MSEL 0" and "MSEL 1" Set up Order "MSEL 0" and "MSEL 1" Set up
Over C5(h):on H:Stop 12cm disc stop detection terminal Loading end detection terminal
L:Normal operation H:Luff servo H:on
Pin No. 80 Name X2 DVSS2 XSUB1 XSUB2 TEST1 TEST2 NC VER/HOR DRV_MUTE /MUTE_L /MUTE_R /RST OCD_CLK /MSTOP DATA SBIO /CLK TX EQCNT XSEL MCNT P-ON MOTOR LO/EJ CD-RW LDCNT DVDD3 FOD TRD I/O O I O I I O O O O O I I I I/O I I/O O O I I O O O O O O O Description Main clock output terminal Ground lines for digital circuit When external DAC,external clock input terminal Test port 1 Test port 2 Not used Put length or breadth switching motor terminal Driver mute control terminal Audio Lch MUTE output Audio Rch MUTE output LSI reset input terminal When OCD connected, clock input Standby detection terminal I2C bus data line (communication line with system computer) When connected to serial writer,data input terminal I2C bus clock line (communication line with system computer) Digital audio interface signal output RF EQ switching terminal During the external DAC connection CD mecha Loading/Eject control ON/OFF Audio and servo origin power control terminal Loading/Eject control switching terminal Loading/Eject control terminal or output L CD-RW control terminal LD control terminal Power supply for digital circuit Focus driver output (PWM output) Tracking driver output (PWM output) Processing Operation
Normal operation is H fixed Normal operation is H fixed H:Put length L:Put breadth L:MUTE ON H:MUTE OFF L:MUTE L:MUTE H:Normal L:Reset H:Normal L:Mecha stop At that time serial writer connected At that time serial writer connected L:x2 times H:x1 times MCLK external input (H:input) L:OFF (HOST control) H:mechanism control L:power on H:power off At that time LO/EJ is "H" When 72pin (P82) is "L",output "L" H:CD-RW L:normal Operation is same LDON as timing
System mi-com Destination type list TYPE2 TYPE1 L L L L uPD780058GC499 L H L H L L uPD780058GC501 L H H L L L L H uPD780058GC502 H L H L uPD780058GC503 L L H: R135 R137 L: R136 R138

TYPE0 L H L H H H H L H L H L R139 R140
MODEL NAME KDC-2024SA/SYA, 2024SG/SYG KDC-2022, 2022V,202MR RY-391CD, RX-491CD KDC-4023, 2023, 3023 KDC-122, 122S KDC-1023, 1023S KDC-222, 222S KDC-3024G/YG, 307G/YG KDC-3023R KDC-3024A/YA, 307A/YA KDC-4024/Y/V/YV KDC-2094YA/YG
CD PLAYER UNIT (X32-5380-00)
C101 1000P C102 1000P C33 0.1

R93 100K

C34 0.28 C32 0.73 AVDD1 AVSS1 P-ON OUTR MCNT
VREFP MSEL1 MSEL0 ASEL NC ICRST LRCK BCLK SRDATA

R85 330

R87 100
DTC114YUA DTC143TUA UN5111 2SA1036K 2SA1362 2SA1576A

R81 330

R100 C1000P R42 4.7K

C72 2200P

C71 2200P
HOT 8EJE(SW2) 12EJE/SDET(SW3) LOE/LIM(SW4)

C70 2200P

C69 2200P
PCK/NTLOCK/FCLK/STLD EFM/NFLOCK/CLDCK/STCK SENSE/RESY/FLAG/STOUT CLVS/VDET/CRC DEMPH/TRCRSO/TEXTCRC DVDD3 X1

C76 6800P

C75 6800P

3.0pp 5.0pp

CD SIGNAL PROCESS BULT-IN MI-COM

52 X1 16.934MHz 59

X2 DVSS2 XSUB1 XSUB2 TEST1 TEST2 NC VER/HOR MOTOR 75 DRV MUTE IFZL MSTOP EQCNT

2SC4081

A+5V A.GND

0V 4.80V 4.80V

IFZR RST

OCD CLK

62 4.90V 0V 4.90V 0-4.9V

0-4.9V 0V

C46 0.1

CP5 100Kx4

D.OUT 22

C47 0.1

DTA114EUA DTA124EUA DTC124EU

R44 10K 12EJE SW 21

12EJE SW S1

LOS SW 20

Q2 D.5V SW

LOS SW

CLK 19 CP1 100x68

DAN202U

DATA 18

0-4.9V

8EJE SW 17

8EJE SW D2

to MAIN UNIT

NC 16 BU+5V 15 D.GND 14

4.90V 0V

CP2 100x4

DA204U DTA114YUA
4.90V 4.90V MUTE L 12 4.90V MRST 11 4.90V MSTOP 10 7.80V A.+8V 9 3.84V Lch 8 0V A.GND 7 3.84V Rch 6 0V LO/EJ 5 0V MOTOR 4 7.80V S.7.5V 3 0V S.GND 2 4.90V LOE/LIM SW 1

MUTE R 13

A.8V SW

4.7K 10K

L R 5 4

DOWN&LIMIT SWITICH

MA142WK UN5212

3SK126

BR24C01AF-W

C36 2.2

0V 0V 0.15V

R43 1K

0V 2.50V 4.90V 2.50V 0V 4.80V

ARF 0.033

C2 2.2

IOP+ RIOP-

C12 3300P

C11 6800P

C9 4700P

23 A/TE

22 TRCRS 2.40V

CNRFDET

R7 3.6K C7 0.1 R6 3.3K C5 2P 39P CC6 RF C1 10u6.3 + R14 100K

4.90V 2.50V 0V 4.80V

R41 47K 16 0V C45 0.1 C44 1000P IREF PLLF2 PLLF 4 C43 2200P RR39 100K C42 0.047

11 4.16V

13 3.94V

10 2.50V

4 2.47V

3 4.90V

2 3.81V

1 0.17V

APC D1

NRFDET

1.25V 1.70V 0V

0.95pp 2.50V

TEOUT FEOUT TEBPF

R15 4.7K

0.87pp

RFSW ARF DSLF AVSS2

C41 1000P VDET VREF

0.91pp

GCTL FBAL TBAL TEN FEN

2.45V 0V

C31 0.1

DVSS1 DVDD1

L PROCESSOR -COM

0-4.8V

R38 220K

C40 0.015

VDET 2200P

R3 5.6K

R12 240K

LDON BDO

R37 6.2K CP4 4.7Kx4

R9 3.9K

OFT 2.40V NRFDET FBAL TBAL PWM

C14 4700P 22

R36 10K

R35 39K 24

R10 100K

C13 270P

C16 330P

R2 5.6K

B/TE C15

R8 27K

R11 33K

4 C17 0.1 C18 0.1

2.50V 2.69V 30 2.69V 31 2.69V 32

2.50V 25

2.50V 26

2.50V 27

3.06V 24

23 C39 0.01

4.80V 2.50V 0V
1 VCC 2 VC 3 GND 4 LD 5 VR PD C+D E A
MOTOR CD-RW LDCNT DVDD2 MCNT LO/EJ XSEL P-ON

PC SPL TVD

RF AMPLIFIER ADAPTED FOR CD-RW D3

R53 4.7K 1.8Kx4 R52 4.7K

FOD TRD

C48 6800P C50

VREF BUFFER

C52 0.1 R45 10K

0V 0.17V 2.69V CD 2.50V E 2.69V A 2.69V B 2.69V F 2.50V 3.84V 14 3.81V 16 3.81V 15 3.84V 13
10 B 11 F 12 GND 13 FCS+ 14 TRK+ 15 TRK16 FCS-

R46 27K

R49 39K

to PICKUP

R43 1K 80

R51 10K

R32 10K C37 0.2.35V TRK IN 16 15

SLED OUT /LOAD SLED IN /EJECT
IC1 : AN22002AA IC2 : MN6627771KP IC3 : BA5824FP DM2 (X92- ) M Q1 : MCH6101 Q2 : 2SA1362(Y) Q3 : DTC124EUA or UN5212 Q4 : DTA143XUA Q5 : 2SC4081 Q6 : 2SA1576A D1 : DAN202U D2 : MA8051-L D3 : DA204U

R50 3.9K

R31 27K
C51 1500P 28 2.35V 27 2.35V 29 2.35V 26 2.35V 30 7.80V
0V 0V 7.80V 3.60V 3.60V 3.81V 3.81V

LOADING & SLED MOTOR

TRK OUT

PREVCC

POW GND2

4CH BTL DRIVER

POW VCC2
2.45V 6 OUTPREGND 8 4.90V 9 MUTE 0V 10 POW GND1
7.80V 11 POW VCC1 3.50V 12 VO13.90V 13 VO1+ 3.84V 14 VO23.84V 15 VO2+
2.35V 4 IN1+ 2.35V 5 IN1-
SIGNAL LINE GND LINE B LINE
X32-5380-00 X32-5380-13 S4 NO YES

2.35V 2

2.40V 3

FCS UP

C49 1500P R47 2.2K R33 18K R48

C38 0.01

SPDL11 12

DM1 (X92- ) M

R34 10K

C61 2.2

FCS DOWN

S.7.5V

SPINDLE MOTOR
CAUTION : For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list). ! Indicates safety critical components. To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer. DC voltages are as measured with a high impedance voltmeter. Values may vary slightly due to variations between individual instruments or/and units.

J4 TOP VIEW

CLK DATA H REQ C DATA C 10 9

Lch 12

Rch CHCON RST 7

BUP D GND REQ H 1

(X25-9600-xx/9612-7x)

A GND 6

MUTE 5
D GND MUTE A GND 9 R231 100

680P 41 R232

R227 30K

R228 30K

C255 1u50 +

BU REQ H CH CON

R407 4.7K RST 8 R409 4.7K DATA C 16 C401 1u50 RLch + RDATA H 17

+ OUT1FRAMMIX2OUT GND

14.4V 0V
VCC1 PGND2 PGND1 W156 STBY

C223 R223 10u+

C224 10u16 R224 + 270

R405 4.7K

R406 4.7K

R408 4.7K

R404 100

R411 100

R403 4.7

R402 10

1 C403 100u10 + C402 1u50 +

22K 22K

L501 R501 6.8K L502 33uH 10P C502 1500P

C504 0.01 L504

C252 0.22u50 C253 0.22u50 RR RL

W407 R252

Q501 AM RF AMPLIFIRE
C509 R502 2.2K R503 R506 2.2K C508 22u10 + 1M

W408 R253

C505 4.7u16 +

R507 1K

C510 100P

C506 0.1

CF51 10.700MHz C585 W509 0.01 L511 4.7uH CF54 450kHz OUT 2 IN

R505 1K

L503 1mH

C507 33u10 +

L513 W601 4.7uH L512

10.700MHz

4.7uH C511 0.01 8

C583 0.1

C591 33u10 +

R523 100K

73 C582

8.0V 8.0V

4.2V 4.2V

L510 4.7uH

FM RF AMPLIFIRE

L508 W508

C580 0.01

CF53 10.700MHz

AMMIX2IN1

MIX1OUT1

C531 1
W533 C533 0.01 W415 W504 R525 R527 100K 330 R528 100K
15 C512 4.7u16 + 3 C513 0.01 C514 0.01 C515 1

AM FM FM AM

VREF5V TUNGND AMMIX1IN+ AMMIX1INANAGC1TC ANAGC1OUT ANAGC1VOUT FMMIX1IN1 RFGND FMMIX1IN2 FMAGC1OUT FMAGCIN FMAGCVOUT AM PW-ON FMANTADJ FMRFADJ OSCGND VCOE VCOB OSCVCC

C544 C543 15P 68P

5.0V 0V
3.3V 2.0V 0V 4.2V 3.3V 0V 2.4V 0V

FMIFAMP1OUT

FMIFAMPREF

FMAMP2OUT

FMIFAMP1IN

FMIFAMP2IN

AMMIX2IN2

MIX1OUT2

IF1GND

FMNAGCIN

TUNVCC

C535 2P

R526 W524 R529

FM AM FM 3.2V 2.0V 0V

2.0V 0V

AM FM AM

AM AM PW-ON AM

R543 5.6K

6800P C545

C542 22P R544 2.2K

4.1V 3.2V 0V 3.4V 0V

FM 2.0V 0V

MPX BUFFER

NOISE BUFFER

R541 1K R542 4.7K
R204 1K 20 R205 4.7K W512

TUNER & E-VOL.

0V 11 0.7V 12 8.0V 13

2 C352 330P

4.2V 2.8V 0V

R3.2V 17

3.8V 18

L517 8.0V 19

3.4V 0V 2.4V 0.8V
PLLGND 27 XTALD 0V 28 DIGGND PLLVCC LFREF XTALG LFHC
4.8V 3.4V 8.0V 29 DIGVCC 30 TUNQUALITY 31 ISSTC C554 0.1 3.2V 32 DEVTC

C600 100u10 +

C555 1000P

R351 2.2K 1

QUAL RDDA

2.5V 22

R546 33K 2.5V 23

8.0V 25

C351 10u6.3 +

5.0V 0V 2.4V 3

RDCL T57 OSCOUT

2.2K C356 10P C355

2.5V 21

R352 2.2K 2

C546 0.01

X501 4.7uH 10.250MHz

VREF OSCIN

C353 10u6.3 +

EXTRES GND TM FSEL

10 0V 9

C550 0.033
ARI RDS 8 FILOUT DECODER W530

L515 4.7uH

C354 0.01

12 5.0V

2.4V 4 MPX 5 5.0V OSEL

C547 10u10 + C548 0.022

4.332MHz 10P

R545 4.3K

C593 1

C552 0.01

MUTE DRIVER

10 7.2V

0V 4.9V

1 REAR Lch+ FRONT Lch+

FRONT LchREAR Lch47K

FRONT Rch-

E2P-ROM

C254 0.22u50 W162

C257 1u50 +

C251 0.22u50

A0 A1 A2 GND

W406 R254

W405 R251
C7.3V 1u50 ACGND 23 + OUT4- PGND0V 14.4V HSD VCC2

D252 R258

5V 0V 5V 0V

ACL SCL

D20 33K

TH1 470

SURGE DETECTOR Q70 D70

R72 36K R71 82K

R22 R73 100K 10K

SDA 10K

3.4V or 22 4.1V

14 7.2V

12 7.2V

SDA 24 0V

R564 10K

0.01 R11

A. C. C DETECTOR

5.0V 0V 0V 0V

8 R201 47K

TEL MUTE

C30 0.01

D30 Q10 B. U. DETECTOR

C40 0.01

7.2V 0V 7.2V 7.3V

R23 100K

R12 100K W532

POWER AMPLIFIRE

L101 C586 0.1

0.1 Q252,253

R255 33K

R68 10K

R122 100

R125 1K

SMETERRC & MPTHTC SW

C584 10u10 +

VSS VOUT

R67 10K

R69 10K

CP3 1Kx2

CP2 2.2Kx2

R264 47K

R123 1K

R126 100K

C102 0.01

C101 100u6.3 + C103 0.1

CF54 450kHz

CP1 10Kx2

M-MUTE

CD-SW3

M-STOP

ACC-DET

B.U-DET

P-STBY

POWER ON RESET

0V 5.0V 0V

R127 2.2K 61 62

AMIF2AMPIN

SMETERC

FMDEM AMIF2AMP REF

DEMGND

AMMIX2OUT

FMDEMREF

AMAGC2TC

TUNER CHANGE FM AM FM

5V 0V 4.2V 2.4V 0V
MPTHTC RDSMUTE AUDIOMUTE QUALITY
W519 W517 R567 1K R566 1K SCL 62

REMO R-CLK CH-REQC

1.4V 1.2V 0V 3.7V 0V FM FM
5.0V 0V 5.0V 0V 5.0V 0V 5.0V 0V

5.0V 0V 5.0V 0V

0V or 5.0V 5.0V 0V 5.0V 0V or 0V

P-MUT 5.0V 0V N.

R128 2.2M

5.0V 0V 2.6V 0V

56 4.0V SMETER 55 0V SD 5V 0V 54 5V SCL 0V 53 SDA

R414 100K

R129 2.2K

CD-SW1 KEY-REQ

R130 2.2K
SDA R565 100K C563 0.47u50 3.9V + C564 0.47 R561 2.7K C104 15P 51 C105 15P

AM PW-ON

3.0V 1.9V 52 0V FMMUTETC 51 TUNEROUT

3.0V TUNERIN

D202 D201
C205 2.2u+ R132 2.2K C204 2.2u+ R133 12K

IN1COM

C47u10 + 41
66 CD-SW2 0V 67 Vss0 5.0V 68 VDD1 RX2 6.8K X1 4.194MHz 70 X1 0V 71 IC 72 XT5.0V XTVDDAVREFS-METER 0-4.0V

MUT 5.0V 0V TUNER-TYPE

0V or 5.0V

SYSTEM CONTROL u-COM

TUNER-TYPE
0V or 5.0V 5.0V 0V 5.0V 0V 5.0V 0V 5.0V 0V 5.0V 0V
L-DATAS L-DATAL AVREF1 R-QUAL R-DATA L-CLK L-CE
3.0V 3.0V 3.0V 3.0V 3.0V 3.0V 3.0V
4.8V 3.4V 8.0V 29 DIGVCC 30 TUNQUALITY CISSTC C554 0.1 3.2V 32 DEVTC C561 1u50 3.0V 33 VREF3V + 0V 34 APGND
IN2R IN2COM IN2L OUTRR APVCC OUTFR OUTRL OUTFL ACLOUT ACRIN ACLIN ACROUT

C106 R134

CH-DATAH CH-DATAC CH-REQH CH-CLK
2.2-4.5V 0.6-4.1V 5.0V 0V
NOISE PHONE PANEL AVCONT 8EJE SW N.C

TYPE RE

N. N.C

R121 2.2K 12

R107 2.2K 13

R106 100K

R103 1K

R104 1K

L516 4.7uH

C562 10u10 +

R413 100K

552.01

R105 470

C556 1000P

3.9V 3.9V 3.9V 3.9V

C560 100P

W409 R261

R20 3.3K

R10 30K
WHT FRONT L WHT/BLK GRY/BLK FRONT R ANT. CONT P. CONT OUT ACC GND GRY BLU BLU/WHT RED BLK GRN GRN/BLK VIOL/BLK VIOL REAR R REAR L

REAR Lch+

REAR LchFRONT Lch-

REAR RchFRONT Rch-

REAR Rch+ FRONT Rch+
SIGNAL LINE GND LINE B LINE POWER SUPPLY (MULTI AVR)

1 4.7K

L1 140uH

C50 10u25 +

IC1 IC4 IC6 IC7 IC8 IC10 IC11 IC12

: : : : : : : :

TDA7479AD BA4911-V4 HD74HC27FP TDA7513 PST3435UL BR24C01AF-W or M24C01-WMN6T or S-24CS02AFJ-TB

10u25 +

C52 10u16 +

1.5K R57

SERVO AVR CONTROL SERVO AVR Q55

C63 22u16 +

UNIT D11, D13,14, D108 D109 D504-106,110 No. 00-12 NO 00-22 YES YES YES NO YES NO NO
KV1720S UPD780058GC501 TDA7386 E58-0879-05 L31-0967-05 KV1720S UPD780058GC499 TDA7560 E58-0879-05 L31-0967-05

PANEL5V SW

12-75 YES
KV1720S UPD780058GC499 TDA7386 E58-0879-05 L31-0967-05

R168 1K

R167 100

RST L-RES L-DATAL

12-74 YES UNIT No.
KV1735S UPD780058GC503 TDA7386 E58-0879-05 L31-0968-05 Q40, Q252, R25, R28, R31, R67,137,170, R102,111,112,134, Q53 Q521 32,140 171,412-414 142,168,173,529 NO YES NO NO NO NO YES NO NO NO YES NO NO

X16J1 2/2

00-12 L31-0970-05 L32-0933-05 YES

R166 1K RR164 470

00-22 L31-0970-05 L32-0933-05 YES YES
12-75 L31-0970-05 L32-0933-05 YES NO YES NO YES YES YES NO NO
10 L-CLK 11 L-DATAS 12 REMO 13 SW5V 14 PANEL 15 ESD-G

R412 100K

R170 1K R171 47

R172 1K

12-74 L31-0971-05 L32-0934-05 YES NO YES NO YES YES YES NO NO UNIT R138,251W160, W400- W405- W410, R135 254,256,260 R139 R258 R261 R263 R526 W524 WH409 No. 00-12 YES YES NO YES YES 180K 5.6K 4.3K 5.6K YES NO NO NO NO YES NO NO YES YES NO NO

180K 5.6K

KDC-222/222S/2023/3023 KDC-2024SA/SG/SYA/SYG KDC-2094YA/YG (1/2)
SWITCH UNIT (X16-1460-xx/2370-12) (B38-1080/1081/1126-05) : KDC-4023/202MR/2024SA/2024SG/2024SYA/2024SYG/2094YA/2094YG/2022/2022V/2023/3023/RX-491CD/RY-391CD
S21 S31 S22 S12 S30 S29 S28 S18 S20 S26 S25 S23 S19 S13 S15 S16 S38 S35 S33 S32 S36 S40 S39 S27 S17 S24 S14 S34 S37 S10 S11 S5 S8 S9 S7 S6

(B38-107

ED1 (SEGMENT) ED1 (COMMON)

C8 CC3

ED1 (COMMON) ED1 (SEGMENT)
ESD-GND 15 PANEL14 SW SW5V REMO 12 TPTP33 RRRR5 1K IC2 TP35 TP34 TP24 +5V

REMOTE SENSOR

2.2 KS5

TP9 TP8 TP7 TP45 44

R12 1K +5V 5.0V

R13 47

KEY DETECT SW

TP11 KI1

GND2 OUT
TP29 L-CE L-DATAL N.C TP32 RST 6 TP26 LED+B 5 TPTP31 PAN 5V D-GND 2 TP9 TP30

(BOTTOM VIEW)

L-CLK 10