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
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