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© 2003-12 PRINTED IN JAPAN
B53-0113-00 (N) 2704
CD RECEIVER
KDC-MP225
KDC-MP4026/G
KDC-W4527/G/GY/Y
KDC-W427Y
SERVICE MANUAL
* Escutcheon
(B07-3001-02)
(B07-3098-02)
Plastic cabinet assy
(A02-1486-13)
Mounting hardware assy
(J21-9716-03)
* DC cord
(E30-6132-05)
(E30-6286-05)
* Antenna adaptor
(T90-0523-05)
* Screw
(N84-4016-46)
Lever
(D10-4589-04) x 2
* Screw set
(N99-1719-05)
CD mechanism extension cord (24PIN) : W05-0934-00
AUTO
DISP
MENU
SCAN
AUD
RDM
REP
OFF
LOU
D
C.S.
Front glass
KDC-MP225 (B10-4464-01)
Panel assy
KDC-MP225 (A64-3170-02)
AME
M.RDM
+
-
F.SEL
SCRL
AUTO
DISP
MENU
SCAN
AUD
RDM
REP
OFF
LOU
D
Front glass
KDC-MP4026 (B10-4468-01)
KDC-MP4026G(B10-4469-01)
Panel assy
KDC-MP4026 (A64-3174-02)
KDC-MP4026G(A64-3175-02)
AME
M.RDM
+
-
F.SEL
SCRL
AUTO
DISP
MENU
SCAN
AUD
RDM
REP
OFF
LOU
D
Front glass
KDC-W427 (B10-4555-01)
Panel assy
KDC-W427 (A64-3336-02)
AME
F.SEL
SCRL
ADJ
DISP
MENU
SCAN
AUD
RDM
REP
OFF
LOU
D
Front glass
KDC-W4527/Y (B10-4466-01)
KDC-W4527G/GY(B10-4467-01)
Panel assy
KDC-W4527/Y
(A64-3172-02)
KDC-W4527G/GY(A64-3173-02)
TI
M.RDM
+
-
F.SEL
SCRL
PTY
* DC cord
(E30-6322-05)
(E30-6323-05)
* Remote controller assy
(A70-2040-05) : RC-505
* Not supplied
* Depends on model. Refer to the parts list.
TDF PANEL INFORMATION
MODEL
PARTS NO.
PANEL NAME
KDC-MP225
Y33-1940-60
TDF-42D
KDC-MP4026
Y33-1940-67
TDF-MP4026
KDC-MP4026G
Y33-1940-63
TDF-MP4026G
KDC-W4527/Y
Y33-1940-64
TDF-W4527
KDC-W4527G/GY Y33-1940-65
TDF-W4527G
KDC-W427Y
Y33-1940-66
TDF-W427Y
VOL


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2
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y
,W427Y
BLOCK
DIA
GRAM
S7V
A8V
BU5V
D5V
A3.3V
SW3.3V
BU3.3V
B
U2.5V
CD PLAYER UNIT (X32-5500-00)
IC1
MECHANISM
CONTROL
Q8
APC
Q9,10
C-SW
IC4
4ch BTL
DRIVER
M
M
DM1
DM2
SPINDLE
MOTOR
LOADING
MOTOR
& SLED
S1
S2
IC9
DAC 3.3V
AVR
Q3,5,6
S3
S4
(0-01)ONLY
LEVEL SHIFT
Q7
Q1,4
LEVEL
SHIFT
MICROPROCESSOR
AVR
BU 3.3V
IC6
DAC 3.3V
AVR
IC7
SW 3.3V
AVR
IC5
LEVEL
SHIFT
IC3
MP3/WMA
DECODER
IC2
PROCESSOR
RF AMP/SERVO
CD SIGNAL
BUFFER
IC8
FO COIL
TR COIL
(OPTICAL PICKUP)
A
C
F
B
E
DPU1
LD
PD
CN2
CN1
15
DGND
DATA
CLK
MUTER
MUTEL
MSTOP
MRST
10
LOS
20
1
8EJE
A8V
L
AGND
DOUT
R
MOTOR
LO/EJ
5
SGND
S7V
12EJE
LOE/LIM
X2
16.00MHz
16.898MHz
X1
OPEN
D5
DGND
D5
24
BU5
3
3
8
1
2
4
4
4
4
VREF
SLD
TRK
FCS
SPD
516
PON


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3
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y
,W427Y
1200mV
DXM-6060
DXM-6560
DXM-6540 : 810mV
: 1200mV
: 1200mV
[email protected]
Term.
SWITCH UNIT (X16- )
TUNER
CD/VCD
CH
BUFFER
RDS
DECODER
BUFFER
EEPROM
REMOCON
RESET SW
WITH
LCD DRIVER
KEY MATRIX
LCD
DSI
SYSTEM
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
SERVO
SERVO+B
SW 14V
WIRED REMO
SUPPLY
IC
POWER
ANT CON
P CON
RESET
SW 5V
PANEL 5V
SW5V
ILL SW
ILLUMI
IC7
IC2
IC1
IC4
IC3
IC8
IC1
IC2
SW
ANALOG
AUX IN
AUDIO
PARK SW
PARK SW
MICROPROCESSOR
MECHA+B
MECHA +B
IC
VIDEO OUT
IC9
IC6
to VIDEO OUT
TUN SMETER
AUDIO OUT
TUN IFC OUT
TUN SCL
TUN SDA
SW5V
AM+B
A8V
CD DISC8 SW
CD DISC12 SW
CD LOS SW
CD SDA
CD SCL
CD LOE LIM SW
CD MUTE L
CD LOEJ
CD MSTOP
CD MRST
SERVO+B
A8V
BU5V
MECHA+B
LX DATA S
LX MUTE
LX RST
LX REQ M
LX REQ S
LX CLK
LX COM
LX DATA M
BACK UP
RDS
Q
U
AL
S-METER
RDS
D
A
T
A
RDS
CLK
FM
AM
MP
LEVEL
CD
QUAL
AFS
CH
SW5V
SW5V
BU5V
DSI
L
CLK
L
D
ATA
S
L
CE
L
D
ATA
L
REMO
MUTE
PWIC MUTE
LINE MUTE
ACC DE
B.U DET
PWIC BEEP
RST
BU5V
A8V
SW5V
AM+B
ILLUMI
A8V
BU5V
BU5V
MODE
FM
AM
MP3
E-TYPE
1372mV
855mV
3600mV
K-TYPE
1800mV
600mV
3600mV
PWIC STBY
BU5V
TDF
DET
SW5V
AUD SCL
AUD SDA
A8V
PON
5
PARK SW
MUTE PRE
PS2-1
PS1-0
PS2-0
PS1-2
PS1-1
PON CD
A8V
CD MOTOR
CD MUTE R
VIDEO OUT
A
UX
SW
RDS
AFS
RDS
NOISE
SW5V
SW5V
L
RST
KEY
REQ
BU5V
BLOCK
DIA
GRAM
ELECTRIC UNIT (X25-)


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KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
SWITCH UNIT (X16-2640-xx/2642-xx/2652-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
LCD driver
Drive for LCD unit
IC2
Remote control IC
Receiving for the remote control unit
Q1
KEY scan detector
key scan start at base gose "L".
Q2
key illumination SW
Lights up for RED key illumination when base voltage level goes "H"
Q3
key illumination SW
Lights up for GREEN key illumination when base voltage level goes "H"
ELECTRIC UNIT (X25-9980-xx/9982-xx/X34-3172-70)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
System microcomputer
Control for TUNER unit, CD mechanism, volume & tone, LCD driver and external CD changer unit
IC2
Electronic volume & N.C.MPX
Control for source selector, volume & tone, and FM multiplex detector.
Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con)
IC3
Power supply IC
IC4
Audio power amp IC
Amplifier for audio signal to derive for 4channel speakers (50W maximum for each channel)
IC6
Muting control IC
Control for timing for mute
IC7
RDS decoder
Decode for RDS signal
IC8
Reset IC
When detection voltage goes below 3.5V or less Reset IC output change to "L" signal
IC9
Switching regulator
Power supply for CD mecanism unit
Q1
Serge detection
When backup voltage become more than 24V output is "L" (momentary power down) /
When backup voltage become less than 24V output is "H"
Q2
Backup detection
When BU voltage supplied output is "L" /
When BU voltage not supplied or momentary power down is detected output is "H"
Q3
ACC detection
When ACC voltage supplied output is "L"
Q4
SW 5V
When base voltage is "L" Q4 is ON
Q21,24
AVR
Servo regulator
Q22
SW
Servo SW
Q23
IC control
Power supply IC controller
Q41
SW
Switching regulator control SW
Q101
Buffer amp
Composite signal buffer
Q151
DSI driver
When base voltage level is "L" DSI LED is light up / When base voltage level is "H" DSI LED
turns off / When panel assy is pull off, cut off the supply to panel 5V AVR.
Q201
Buffer amp
Noise buffer amp
COMPONENTS DESCRIPTION
SW1
OUT
1.5~3.0V
Audio ON
3.5~5.0V
Audio P-con ON
7.0V~
Audio P-con, P-ant ON
SW2
OUT
2.0~3.0V
Illumination, FM ON
4.0V~
Illumination, AM ON


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5
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
Ref. No.
Application / Function
Operation / Condition / Compatibility
Q252
For surge measure of audio power IC
When base voltage to "L", for control to power IC function (STAND BY)
Q350
Pre & NF mute SW
When base voltage to "L", drive to pre & NF mute SW (Q351)
Q351
Pre mute SW
When base voltage to "H", muting to the pre Lch or NF Lch line
Q352
Pre mute SW
When base voltage to "H", muting to the pre Rch or NF Rch line
Q401
DSI illumination SW
When base voltage to "H", DSI illumination is light up.
CD PLAYER UNIT (X32-5500-00)
Ref. No.
Application / Function
Operation / Condition / Compatibility
Generation of RF signal based on the signals from the APC circuit and pickup, and generation
IC1
RF amplifier adapted for CD-RW
of servo error (focusing error and tracking error) signals. Detection of dropout, anti-shock,
track crossing and off-track conditions, included gain control function during CD-RW.
Focusing, tracking, sled and spindle servo processing. Automatic adjustment (focusing,
IC2
CD signal processor built-in MI-COM
tracking, gain, offset and balance) operations. Digital signal processing (DSP, PLL, sub-codes,
CIRC error correction, audio data Interpol ration) operations, and Microcomputer function.
IC3
MP3/WMA decoder
IC4
4CH BTL driver
Focusing coil, tracking coil, spindle motor and sled motor driver, disc loading and eject operation.
IC5
AVR
For SW3.3V AVR
IC6
AVR
For BU3.3V AVR
IC7
AVR
For BU2.5V AVR
IC8
Selector
Serial audio signal selector IC
IC9
AVR
For IC2 (DAC section) 3.3V AVR
Q1,3~7
Level shift
3.3V
5.0V
Q8
APC
LD power control
Q9,10
SW
Delay to sub beam line (antecedence beam)
D2
Protection diode
IC2 protection (for reset line)
D3
Protection diode
Laser diode protection
COMPONENTS DESCRIPTION