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

Plastic cabinet assy
(A02-1486-13)

Mounting hardware assy
(J21-9716-03)

Lever
(D10-4589-04)

Escutcheon
(B07-3001-02)

DC cord
(E30-4790-05)

Antena adaptor
(T90-0523-05)

2

TUNER

MP3

CH

SWITCH UNIT (X16- )

BUFFER

RDS
DECODER

BUFFER

EEPROM

REMOCON

RESET SW

WITH

LCD DRIVER
KEY MATRIX

LCD

DSI

u-COM

MPX

E-VOL

&

ACC DET

TEL MUTE

B.U DET

PRE MUTE

DRIVER

MUTE

POWER
IC

THERMAL
PROTECT

ACC

TEL MUTE

BACK UP

(REAR)

PRE OUT

SP OUT

SURGE DET

SERVOSERVO+B

SW 14V

WIRED REMO

SUPPLY
IC

POWER

ANT CON
P CON

RESET

SW 5V

PANEL 5V

SW5V

MECHA
+B

MECHA+

ILL SW

ILLUMI

IC7

IC2

IC1

IC4

IC3

IC8

IC1

IC2

S-METER

AUDIO OUT

IFC OUT

PLL-DATA

PLL-CLK

SW5V

AM+B

A8V

SW(SW3)

12EJE SW(SW2)

LO/S SW(SW1)

MS CLK

MS DATA

LO.E/LIM

M MUTE

LO/EJ

M STOP

M RST

SERVO+B
A8V
BU5V
MECHA+

DATA C

CH MUTE

CH RST

REQ H

REQ C

CH CLK

CH-CON

DATA H

BACK UP

QUAL

S-METER

R DATA

R CLK

FM
AM
MP
LEVEL
CD

QUAL

AFS

CH

SW5V

SW5V

BU5V

DSI

L CLK

L DATAS

L CE

L DATAL

REMO

MUTE

P-MUTE

PHONE

ACC DET

B.U DET

BEEP

PS1-0

PS1-1
PS1-2
PS2-0
PS2-2

RST

BU5V

BACK UP

A8V

SW5V

AM+B

ILLUMI

A8V

BU5V

BU5V

MODE

FM
AM

MP3

E-TYPE
1372mV

855mV

3600mV

K-TYPE
1800mV

600mV

3600mV

P-STBY

BU5V

TDF DET

PANEL

BU5V

SW5V

DATA
CLK

KDC-M4524/G/Y/GY

BLOCK DIAGRAM

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
Q352 Pre mute SW
Q401 DSI ILLUMI SW ON when the base goes “Lo”.

Audio Pre-output is muted when the base goes “Hi”.

3

KDC-M4524/G/Y/GY

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER UPD703030GC011 (IC1 : X25)

pin pin name I/O Description

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
6VDD ­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
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)
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 ­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

I CD Down Switch detection terminal H : chucking

4

truth table

Processing Operation

Display light off, KEY reset : L Display light on,
KEY scan : H

Ceramic capacitor connected to the pair grounds

KDC-M4524/G/Y/GY

MICROCOMPUTER’S TERMINAL DESCRIPTION

pin pin name I/O Description

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

64~67

- O Not used
68 LX-RST O Reset output to external unit
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
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)
92 - O Not used
93 - O Not used
94 LX-DATAS I Data input from external unit
95 LX-DATAM O Data output to exter nal 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

I

12cmDISK EJECT position detection switch terminal

truth table

Processing Operation

during momentary power down L,
When M-MUTEL : L

Usually, L after system RST returned,after
more than 400m sec H,and L

TEL MUTE : 1V orless, NAVI MUTE : more
than 2.5V

12cmDISC : L

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
HHHONONON

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

KDC-MP222 K - 0 0
KDC-MP4023 M (E) - 0 1
KDC-M4524/G/Y/GY E/E2 - 1 0

TYPE2 TYPE1 TYPE0

destination ports

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

4. Special display in Tuner mode

• CRSC :OFF regardless of the presence of
switching function.

• SYSTEM Q : Flat

• BEEP : When pressing any ke ys, the b uzzer

generates a beep at any time.

• SYSTEM Q MENU: OFF

When any of the follo wing 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 AUT O → F orced Wide → F orced 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 ad-
justment 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 follo wing 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.

PRESET 4

PRESET 5

PRESET 6

Long press/hold : Clear CD operation time at
the CD operation time displaying.
(Display) CDTimxxxxx Max. 60000 (hours)
Short press : Display CD ejection count.
Long press/hold : Clear CD ejection count at
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
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

(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

Description

7

A B C D E

W

0
0

R411

D2

KDC-M4524/G/Y/GY

1

2

3

4

5

6

PC BOARD (COMPONENT SIDE VIEW)

ELECTRIC UNIT (X25-9622-71/9812-70) (J74-1466-12)

J2

J3

J4

R358

R355

R356

R352

W1

+

L3

C352

R357

R351

EB

Q350

C351

A1

1

C118

8

C115

C114

C116

C117

1

24

IC7

D310

D309

L6

L7

L8

D311

W2

L5

R302

R112
R113
R114

13

11 12 8 4 3 2

9106 751

R301

R308

R311

R306

R309

C302

C303

D206
D203

C309

28

IC2

1

C201

D201

D202

CN4

1
2

R374

D151

D160
D161

D162

R310

C210

R307

C301

C202

R304

D303
D302

D304

C211

C203

R201

D152

D153

D154

R305

C212

C205

C206
C204
R203

R202

D157
D158
D155

R303

15

14

D301

D307
D306
D308

D305

SCL

C213

L10

W3

D52
D51

1

C253

1

SDA

C254

IC10

W6

W7W4

W9

IC4

242

25

C257

C258

W10

W11

R31

W5

C251

W8

C255

D31

C252

C256

R255

14

8

IC6

NOISE

1

SMETER

R315

58

IFC

4

R101

R154

R104

R206

224

C304

R106

R102

C111

R52

R401

R402

R404

R403

R153
R152

R51

7

R405

R406

CN2

76

100

75

1

R207

R317

R208

R256

R251

D269

IC1

R160

D270

R10

EB

Q3

231

R9

R11

R60

TEST

D271

C4

R59

R63

D4

BEE

R24

C5

Q23

25

R55

R56

R25

50

26

Q2

R7

R26

R54

R58

R62

R8

EB

D26

R28

R420

R53

R61

RST

▼

D255

D252

R6

R27

R409

C3

R5

W12

R412

C407

9
8

D251

D254

R4

R417

R415

X1

C4
C4

W17

R419

R410

R182

P1

D156

R181

R176

W15

9

16

R171

R174

R173

R175

R172

X3

D159

R183

15 1

R180

14 2

J5

7

▲

8

D252

D255

▼

D24

D20

D18

D10

D16

D19

D15

D11

D12

D7

D8

D9

D17

D1

D14

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

D13

IC2

D23

K13

K15

KS4

KS3

KS5

KS2

VOL-

VOL+

KI1

KI4

KI2

13

54

1 45 46 68

ATT

1

2

3

45 6

RST CLK

TI

AUD

FM

AM

SRC

JIHGF

KDC-M4524/G/Y/GY

1

J1

1

R8

R27

R28

ST

R6

W12

R412

R409

C407

▲

9
8

D253

C3

R5

D251

D254

D2

R4

W17

R411

R417

R419

R415

X1

C405
C408

R410

X2

C406

W16

D3

W18

GND

R416

IC8

213

R23

D23

W21

W19

W20

L11

4

D401

W14

W13

W15

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

R13

R22

W23

C23

C24

C26

C409

VDD

C43

C44

D22

W22

W30

L1

16

1

D1

▲

W25

W28

W32

C1

W29

C21

W31

2

E

B

Q21

D21

3

C22

C29

C25

112

W26

IC3

4

C28

W27

W24

C41

IC9

L12

R407

D41

C27

R44

C42

51

R43

C45

R41

EB

R42

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

Q41

IC Q Address

15E
24C
34G
42D
64D
85F
95G

24E

34E
21 2H
23 4E
41 5G

350 3B

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

IC Address

22J

5

6

7

9