KENWOOD KDC-M4524, KDC-M4524G, KDC-M4524Y, KDC-M4524GY Service Manual

CD RECEIVER

KDC-M4524/G/Y/GY

SERVICE MANUAL

© 2002-12 PRINTED IN JAPAN B53-0014-00 (N) 1874

Panel assy

(A64-2879-02): KDC-M4524 /Y

(A64-2882-02): KDC-M4524G /GY

Escutcheon (B07-3001-02)

Plastic cabinet assy	DC cord
(A02-1486-13)	(E30-4790-05)

Mounting hardware assy	Lever	Antena adaptor
(J21-9716-03)	(D10-4589-04)	(T90-0523-05)

2

TUNER	AM+B
	SW5V
	A8V
AUDIO OUT

BUFFER

S-METER

PLL-DATA

PLL-CLK

IFC OUT

MP3

MS DATA

MS CLK

LO/S SW(SW1) 12EJE SW(SW2) SW(SW3) LO.E/LIM M MUTE M RST

MSTOP LO/EJ

SERVO+B

A8V

BU5V

MECHA+

CH

REQ C

CH CLK

DATA H

CH-CON

REQ H

DATA C

CH RST

CH MUTE

BACK UP

SW5V

IC7

RDS

DECODER BUFFER

IC1

METER-	RDATA RCLK QUAL
S

DATA

CLK

u-COM

DSI	TDFDET	DATASL CLKL CEL DATALL
BU5V

			A8V
	IC2
	FM
	AM
	MP		E-VOL
	LEVEL
			&
	CD
			MPX
	CH
	AFS
	QUAL
			SW5V
			EEPROM
			MUTE
		P-MUTE
			BEEP
			P-STBY
			PHONE
		ACC DET
		B.U DET
			PS1-0
			PS1-1
			PS1-2
			PS2-0
		REMO	PS2-2
			RST

		PRE MUTE			PRE OUT
					(REAR)
				MODE	K-TYPE	E-TYPE
			IC4	FM	1800mV	1372mV
				AM	600mV	855mV
				MP3	3600mV	3600mV
MUTE
DRIVER		BU5V	POWER		SP OUT
			IC
		THERMAL		BACK UP
		PROTECT
		SW5V
		TEL MUTE			TEL MUTE
		ACC DET			ACC
		B.U DET			BACK UP
	SURGE DET			MECHA
				+B
SERVO+B		SERVO	SW 14V
				MECHA+

BU5V

PANEL 5V WIRED REMO

BU5V

	PANEL	SW5V
	IC1	IC2	IC8
	LCD DRIVER	REMOCON	RESET
	WITH
DSI	KEY MATRIX
		RESET SW
			ILLUMI

BU5V

AM+B

A8V

ILLUMI

BU5V

IC3
POWER	ANT CON
SUPPLY
IC	P CON

LCD	ILL SW

SW5V

SW 5V

BLOCK	M4524/G/Y/GY-KDC
DIAGRAM

SWITCH UNIT (X16- )

KDC-M4524/G/Y/GY

COMPONENTS DESCRIPTION

● SWITCH UNIT (X16-2052-71/2362-70)

Ref. No.	Function	Operation
IC1	LCD Driver
IC2	Remote-control IC
Q1	Key-scan Start SW	"ON" when the base goes "L".
Q2	Key-illuminations SW (GREEN)	ON (Key-illuminations Green) when the base goes "H".
Q3	Key-illuminations SW (RED)	ON (Key-illuminations RED) when the base goes "H".

● ELECTRIC UNIT (X25-9622-71/9812-70)

	Ref. No.	Function	Operation
	IC1	System MI-COM
	IC2	E-VOL. & N.C. MPX
	IC3	Power Supply IC
	IC4	Power IC
	IC6	Analog SW (Mute logic)
	IC7	RDS Demodulator
	IC8	Reset IC	“L” : detection voltage below 3.6V
	IC9	CD mechanism 5V AVR
	Q1	SERGE Det.	ON when the base goes “Hi”.
	Q2	B.U. Det.	ON when the base goes “Hi” during BU applied.
	Q3	ACC Det.	ON when the base goes “Hi” during ACC applied.
	Q4	SW 5V	ON when the base goes “Lo”.
	Q21	SERVO +B AVR	Output voltage 7.4V
	Q22	SW 14V	ON when the base goes “Hi”.
	Q41	MECHA 5V AVR SW	ON when the base goes “Lo”.
	Q101	Buffer	The buffer for composite signals.
	Q151	Panel 5V SW	ON when the base goes “Lo”.
	Q201	Noise buffer
	Q350	Mute driver for Audio mute SW	ON when the base goes “Lo”.
	Q351	Pre mute SW	Audio Pre-output is muted when the base goes “Hi”.
	Q352	Pre mute SW
	Q401	DSI ILLUMI SW	ON when the base goes “Lo”.

3

KDC-M4524/G/Y/GY

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER UPD703030GC011 (IC1 : X25)

pin	pin name	I/O	Description	truth table	Processing Operation
1	PLL CLK	I/O	Clock output to F/E
2	AFS	O	Noise detection time constant switching terminal		FM seek/during/AF search : L, receiving : H
3	TDF DET	I	TDF panel detection terminal		Panel detached : H, panel attached : L
4	IC2 SDA	I/O	Data input and output terminal with E-VOL
4	IC2 SDA	I/O	Data input and output terminal with CD mechanism
4	IC2 SDA	I/O	Data input and output terminal with E2PROM
5	IC2 SCL	I/O	Clock output to E-VOL
5	IC2 SCL	I/O	Clock output to CD mechanism
5	IC2 SCL	I/O	Clock output to E2PROM
6	VDD	-
7	VSS	-
8	-	O	Not used
9	BEEP	O	Beep output terminal
10	REMO	I	Remote control input
11	R QUAL	I	RDS decoder quality input terminal
11	-	O	Not used		With no RDS and destination is output L
12	R DATA	I	RDS decoder data input terminal
12	-	O	Not used		With no RDS and destination is output L
13	L CE	O	CE output to LCD driver
14	-	O	Not used
15	L INH	O	Reset output to LCD driver		Display light off, KEY reset : L Display light on,
					KEY scan : H
16	DSI	O	DSI control terminal		DSI light on : H, Light off : L
17	-	O	Not used
18	TEST	-
19~21	-	O	Not used
22	MOSW	O	CD mechanism motor IC switch	e	Loading/Eject/Break : H
23	LO/EJ	I/O	CD mechanism Loading/Eject switch	e	Stop/Break : Hi-Z Loading : L Eject : H
24	M STOP	O	Stop request to CD mechanism
25	M RST	O	Reset output to CD mechanism		Usually : H, Reset : L
26	MUTE	I/O	Mute terminal		L : MUTE OFF, H : MUTE ON
27	LO.E/LIM SW (SW3)	I	CD Down Switch detection terminal		H : chucking
28	M MUTE L	I	MUTE request from CD mechanism		L : MUTE request
29	M MUTE R	I	MUTE request from CD mechanism		L : MUTE request
30	-	O	Not used
31	RESET	I			Usually : H, Reset : L
32	XT1	I	Sub clock 32.765kHz
33	XT2	I	Sub clock 32.765kHz
34	REGC	-			Ceramic capacitor connected to the pair grounds
35	X2	I	Main clock 20MHz
36	X1	I	Main clock 20MHz
37	VSS	-
38	VDD	-
39	CLKOUT	-
40	IC2 TYPE1	I	E-VOL setting switching terminal
41	IC2 TYPE0	I	E-VOL setting switching terminal
42	-	O	Not used
43	TYPE1	I	Destination switching terminal	r
44	TYPE0	I	Destination switching terminal	r

4

KDC-M4524/G/Y/GY

MICROCOMPUTER’S TERMINAL DESCRIPTION

pin	pin name	I/O	Description	truth table	Processing Operation
45	CD MECHA+B	I/O	Power supply control terminal for MP3		ON : L, OFF : Hi-Z
46	SW5V	I/O	Control terminal for switch5V		ON : L, OFF : Hi-Z
47	PS2-0	O	Control terminal for power supply IC	w
48	PS2-1	O	Control terminal for power supply IC	w
49	PS1-0	O	Control terminal for power supply IC	q
50	PS1-1	O	Control terminal for power supply IC	q
51	PS1-2	O	Control terminal for power supply IC	q
52	BU DET	I	BU detection terminal		BU detection : L, with no BU : H
53	ACC DET	I	ACC detection terminal		ACC detection : L, with no ACC : H
54	-	O	Not used
55	BVDD	-
56	BVSS	-
57,58	-	O	Not used
59	P-MUTE	O	POWER IC MUTE output terminal		POWER OFF : L, ALLOFF : L, TEL MUTE : L
60	P-STBY	O	POWER IC STBY output terminal		POWER IC ON : H, OFF : L
61,62	-	O	Not used
63	PRE MUTE	O	PREOUT MUTE output		during momentary power down L,
					When M-MUTEL : L
64~67	-	O	Not used
68	LX-RST	O	Reset output to external unit		Usually, L after system RST returned,after
					more than 400m sec H,and L
69	LX-CON	O	Control output to external unit		ON : H, OFF : L
70	AVCONT	O	AD reference voltage control output		during motion : H
71	AVDD	-
72	AVSS	-
73	AVREF	-			Connection with 70pin
74	PHONE	I	PHONE detection terminal		TEL MUTE : 1V orless, NAVI MUTE : more
					than 2.5V
74	-	I	Not used (with no PHONE destination)
75~81	-	I	Not used
82	S-METER	I	S-meter detection terminal		Dependant for control use of tuner
83	NOISE	I	FM noise detection terminal		Dependant for control use of tuner
84	IFC-OUT	I	F/E IFC OUT input terminal		Dependant for control use of tuner
85	LX-MUTE	I	MUTE request to external unit		H : MUTE ON, L : MUTE OFF
86	LX-REQM	O	Request output to external unit		Request detection : L
87	R CLK	I	RDS decoder Clock input terminal
87	-	O	Not used		Destination with no RDS : output L fixed
88	LX-REQS	I	Request intput to external unit		Request detection : L
89	KEY-REQ	I	Request of communication from LCD driver		L : KEY input
90	LO.S SW (SW1)	I	Loading start switch detection terminal		Loading start : L
91	12EJE SW (SW2)	I	12cmDISK EJECT position detection switch terminal		12cmDISC : L
92	-	O	Not used
93	-	O	Not used
94	LX-DATAS	I	Data input from external unit
95	LX-DATAM	O	Data output to external unit		Holding the last
96	LX-CLK	I/O	Clock output and input terminal with external unit
97	L DATAL	I	Data input from LCD driver
98	L DATAS	O	Data output to LCD driver
99	L-CLK	I/O	Clock output to LCD driver
100	PLL DATA	I/O	Data output and input terminal with F/E

5

KDC-M4524/G/Y/GY

MICROCOMPUTER’S TERMINAL DESCRIPTION

Truth table 1

PS1-0

PS1-1

PS1-2

AUDIO

P-CON

P-ANT

L

L

L

OFF

OFF

OFF

H(L)

L(H)

L

ON

OFF

OFF

H

H

L

ON

ON

OFF

H

H

H

ON

ON

ON

Truth table 2

PS2-0

PS2-1

ILLUMI

FM+B

AM+B

L

L

OFF

OFF

OFF

H (L)

L (H)

ON

ON

OFF

H

H

ON

OFF

ON

Truth table 3

MOSW

LO/EJ

CD mechanism operation

L

H

Load

H

H

Eject

-

L

Lo/Ej invalid truth

Hi-Z

H

Brake

Truth table 4 (destination setting)

model

destination

destination ports

TYPE2

TYPE1

TYPE0

KDC-MP222

K

-

0

0

KDC-MP4023

M (E)

-

0

1

KDC-M4524/G/Y/GY

E/E2

-

1

0

TEST MODE

1.How to enter the test mode

While holding the Preset 1 and Preset 3 keys, reset the unit.

2.How to exit from the test mode

Reset the unit, ACC OFF, power OFF and Panel detached. (Note) The test mode cannot be terminated by momen-

tary power down.

3.Initial status in the test mode

• Sources	: ALL OFF
• Display	: All segments are lit.
• Volume	: -10 dB (displayed as "30")
• Loudness	: OFF

• CRSC	: OFF regardless of the presence of
	switching function.
• SYSTEM Q	: Flat
• BEEP	: When pressing any keys, the buzzer
	generates a beep at any time.

•SYSTEM Q MENU : OFF

4.Special display in Tuner mode

When any of the following messages is displayed in Tuner mode, the F/E may be abnormal.

•"TNE2P NG" : The EEPROM is set to the default (unstable values) because the F/E was shipped without passing through the adjustment process, etc.

•"TNCON NG" : Communication with the F/E is not possible.

6

KDC-M4524/G/Y/GY

TEST MODE

5. Forced switching of K3I

Each press of the Preset 6 key in Tuner mode should switch K3I from AUTO → Forced Wide → Forced Middle → Forced Narrow → AUTO.

The initial status is AUTO and the display shows these

modes as follows.
• AUTO	: FMA
• Forced Wide	: FMW
• Forced Middle	: FMM
• Forced Narrow	: FMN

6.Test mode specifications of the CD receiver

•Forced ejection is inhibited in the reset start operation. When the unit is reset while a CD is loaded in it, the CD is not recognized by resetting.

•Each press of the Track Up key jumps to the following

track numbers:

No. 9 → No. 15 → No. 10 → No. 11 → No. 12 → No.13 → No. 14 → No. 9 (The cycle restarts from here.)

•Each press of the Track Down key jumps to the previous track number to the track being played.

•When the number of total trucks of the MP3 disc is less than 9, 1st truck is played.

•When the disc media is CD, a short press of the Preset 1 key jumps to the track number 28.

7.Audio-related specifications

•A short press of the Q key initiates the audio adjustment mode.

•Pressing the key on the remote initiates the audio adjustment mode.

•Fader is selected to the initial item.

•Continuous holding of a remote control key is inhibited.

•Bass, Middle and Treble are adjusted in 3 steps of Min/ Center/Max with the Track Up/Down keys.

•Balance is adjusted in 3 steps of Left Max/Center/Right Max with the Track Up/Down keys.

•Fader is adjusted in 3 steps of Rear Max/Center/Front Max with the Track Up/Down keys.

•Bass f/Bass Q/Bass EXT/Middle f/Middle Q/Treble f are not death with by the audio adjust.

8.Menu-related specifications

•A short press of the PLAY/PAUSE key initiates the Menu mode.

•Pressing the DNPP/SBF key on the remote initiates the Menu mode.

•Continuous holding of a remote control key is inhibited, a short press initiates the Menumode.

•Contrast is adjusted in 3 steps of 0/5/10, with the trackup/ down keys.

9.Backup current measurement

When the unit is reset while ACC is OFF (i.e. by turning Backup ON), the MUTE terminal goes OFF in 2 seconds in place of 15 second. (The CD mechanism is not activated at this time.)

10.Special display when the display is all on

Pressing the Preset keys while the power is ALL OFF displays the following information.

Version display

PRESET 1 (8 digits, Month/Day/Hour/Minute)

(Display) SYSxxxxx : System microcomputer

Short press : View power ON time. (The All OFF period is not counted.)

PRESET 3 Long press/hold : Clear power ON time at the power ON time displaying.

(Display) PonTim xxxxx Max. 60000 (hours)

Short press : Display CD operation time.

Long press/hold : Clear CD operation time at

PRESET 4

the CD operation time displaying. (Display) CDTimxxxxx Max. 60000 (hours)

Short press : Display CD ejection count.

Long press/hold : Clear CD ejection count at

PRESET 5

the CD ejection count displaying.

(Display) EjeCnt xxxxx Max. 60000 (times)

Short press : Display Panel open/close count.

Long press/hold : Clear Panel open/close

PRESET 6

count at the Panel open/close count. (Display) PnCnt xxxxx Max. 600000 (times)

11.Other specifications

LINE MUTE inhibit time is 1 second from 10 second when start up the test mode.

12.Switching the frequency span (K/M type)

While holding the preset q key and preset t keys, reset the unit.

13.Response to OEM setting (destination of electronic volume setting)

S03F/E models are response to OEM models option at put in µ -com 2 pin.

Its setting re following steps.

	IC2-TYPE0	IC2-TYPE1	Description
	(41pin)	(40pin)
	Low	Low	qTrade model (initial quantif)
	Low	High	wTrade model (CRSC Change)
	High	Low	eOEM model-ready CRSC change
	High	High	rOEM model-ready CRSC &
			de-emphasis

7

A

B

C

D

E

	KDC-M4524/G/Y/GY
1	PC BOARD (COMPONENT SIDE VIEW)
	ELECTRIC UNIT (X25-9622-71/9812-70) (J74-1466-12)	▼

2

J4

3

L3

A1

1

4

5

24

6

7

8

W3

W6

W9

J2

W4

W7

IC4

9

J3

2

24

8

13 11 12

8

4

3

2

D255

9

10

6

7

5

1

1

25

D251

W5

W8

R356

R358

R355 R351

R357

R302

R306

R301

R308

R311

R309

R310

R307

R304

R305

R303

D301

W10

W11

D252

D254

W1

R352

Q350

D311

C302

D304

C253

C251

C255

C257

D303

C258

BE

D310

D302

R31

R8

D309

C303

D307

+

D206

D306

C301

D308

C254

C252

C256

D269

D270

D271

R6

C3

D2

D31

C352

D203

D305

C351

R256

Q2

R255

R9

D4

BE

R5

R4

R10 C4

R7

C115

C118 C114

8

IC7

L10	14	8	R317

	C309				IC6
			C211
	L5	C210		NOISE 1
	28		15		7

L8 L7 L6 W2

IC2

		1			C203	C205	C212
							14
							C206
	C201	D201	D202	C202	R201	R202	C204	C213
							R203

CN4

1

2

	SMETER
8	5
	IC10	IFC
1	4	R101

SCL

SDA

R315	C111	R401	R405	R406
C304	R404	R402			75
					76
R106		R403
	R52 R51
			R153
R154			R152
				100
R102					1
R104
R206

C116				D52	R207	R208
C117		R374	D152
			D153	D51
	R112	D151	D154
1		D160
	R113		D157		2
	R114
		D161	D158		CN2
		D162	D155		1

Q3

EB

C5

W12

W17

R251

R11

Q23

D26

EBE

R25

R26

R27

R28

R24

50

R417

R411

R412

R415

IC1

R419

R420

R409

X1

26

C40

25

C40

R59

R55

R54

C407

R160

R60

R56

R58

R53

R410

R63

R62

R61

TEST

RST

24

W

23

9

16

P1

X3

D159

R172

R183

R175

R173

R171

R174

R180

R182

D156

W15

R181

14

2

R176

15

1

J5

▲

F	G	H	I	J
			KDC-M4524/G/Y/GY

1

▼			SWITCH UNIT
			X16-2052-71/2362-70 (J74-1464-02)

			J1			W30
			L1	W28
		9	16
		8	1			W31	B E
D255	D251	D253	R22		C1
D252	D254		R23
		W16	W25	W32	W29		Q21
			D1

D23	▲	C21
	D22

1		W23
R8	W21

			D2	D3			C23
R6	C3
R5		R4				W19
				W18			C24
W12			W17			W20
				GND			C26
R27
R28		R417	R411	R416		L11	R13
R412
		R415	R419				C409
R409		X1
		C405
		C408
C407				X2
				C406	IC8
			R410				VDD
					2	3
					1	4
				D401			W22
RST
			W14
			W13				C43
							C44
1		W15
6

			D21
C22	1
	W26
C29	IC3
C25
	12
C28		C27
	W27
	R44	R43	C45	R41	R42
	W24
	C41	C42		EB		Q41
		5
	IC9
		1

D41

L12

R407

ELECTRIC UNIT (X25-9622-71/9812-70)

IC	Q	Address
1		5E
2		4C
3		4G
4		2D
6		4D
8		5F
9		5G
	2	4E
	3	4E
	21	2H
	23	4E
	41	5G
	350	3B

▲Refer to the schematic diagram for the values of resistors and capacitors.

D23	SRC	KI1	-VOL	KI4	D14
			D1		KI2
				5	1
	KS2			4	3

D17

ATT

1

D9

2 D8

3 D7

4

D12

5

D11

6

D10

RST

CLK

D18

KS5 D20 TI

AUD

D24

IC2

1

45

46

68

		KS3
	AM	D19
		KS4
		D15
		D16
K15		FM
	K13

SWITCH UNIT (X16-2052-71/2362-70)

IC	Address
2	2J

VOL+

2

D13

3

4

5

6

7

9