Kenwood KDC-MP225 User manual

© 2003-12 PRINTED IN JAPAN
B53-0113-00 (N)2704
CD RECEIVER
KDC-MP225
KDC-MP4026/G
KDC-W4527/G/GY/Y
KDC-W427
Y
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
LOUD
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
LOUD
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
LOUD
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
LOUD
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

2
KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y
BLOCK DIAGRAM
S7V
A8V
BU5V
D5V
A3.3V
SW3.3V
BU3.3V
BU2.5V
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)
AC
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

3
KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y
1200mV
DXM-6060
DXM-6560
DXM-6540 : 810mV
: 1200mV
: 1200mV
1Vpp@75 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
SERVOSERVO+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 QUAL
S-METER
RDS DATA
RDS CLK
FM
AM
MP
LEVEL
CD
QUAL
AFS
CH
SW5V SW5V
BU5V
DSI
L CLK
L DATAS
L CE
L DATAL
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
AUX SW
RDS AFS
RDS NOISE
SW5V
SW5V
L RST
KEY REQ
BU5V
BLOCK DIAGRAM
ELECTRIC UNIT (X25-)

4
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 forTUNER 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

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

6
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
MICROCOMPUTER’STERMINAL DESCRIPTION
●SYSTEM MICROPROCESSOR : 784225GC231A (X25 : IC1)
Pin No. Pin Name I/O Description / Processing Operation
1 TUN SMETER I S meter detection input terminal
2 RDS NOISE I FM noise detection input terminal
3LINE MUTE I Phone Muting signal input terminal (More than 2.5V : NAVI mute, Less than 1.0V :TEL mute)
4AVSS - GND
5LRST O Reset signal output (for LCD driver) H : Light on display, key scan, L : Light out on display, key reset
6LCE O CE output for LCD driver IC
7AVREF1 - BU5.0V
8LDATAL I DATA input terminal from LCD derive IC
9LDATAS O DATA output terminal to LCD driver IC
10 L CLK O CLK output terminal to LCD driver IC
11 TDF DET I Panel assy detect terminal H : Panel assy come off
12 AUX ON O Select for AUX input signal H : AUX, L : Other
13 RDS QUAL I RDS decoder QUAL signal input terminal
14 RDS DATA I RDS decoder Data signal input terminal
15 PWIC BEEP O Beep audio signal output terminal
16 LX DATA S I DATA signal input from EXT. unit
17 LX DATA M O DATA signal output to EXT. unit
18 LX CLK I/O CLK signal input/output to EXT. unit
19 TUN SCL O I2C CLK signal output terminal (for front-end)
20 TUN SDA I/O I2C DATA signal input/output terminal (for front-end)
21 TUN IFC OUT I IFC signal input terminal H : Station detect, L : No detect
22 RDS AFS O Time constant select terminal (for noise detect) H : Receiving, L : FM seek, AF search
23 CD SDA I/O I2C DATA output terminal (for CD mechanism, electric VR)
24 AUD SDA O CLK output terminal (for CD mechanism, electric VR)
25 NC - NC
26 LX RST O Reset signal output to EXT. unit
27 LX CON O Control signal output to EXT. unit H: ON L: OFF
28 LX MUTE I Request signal input terminal from EXT. unit L : Mute ON
29 LX REQ M O DATA signal output to EXT. unit
30 PWIC SVR O SVR control for Audio power IC
31 PWIC STBY O STBY control for Audio power IC H : Power IC ON
32 PWIC MUTE O Muting control for Audio power IC
33 VSS1 - GND
34 ACC DET I ACC detection input terminal L : ACC detect
35 RESET2 O Reset output terminal L : Active
36 MUTE O Muting signal output terminal
37 BU DET I BU detect input terminal L : BU detect
38 PARK SW I Packing condition detect terminal H : OFF, L : ON (PARKING)
39 PS2 1 O Power supply IC control terminal

7
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
MICROCOMPUTER’STERMINAL DESCRIPTION
Pin No. Pin Name I/O Description / Processing Operation
40 PS2 0 O Power supply IC control terminal
41 PS1 0 O Power supply IC control terminal
42 PS1 1 O Power supply IC control terminal
43 PS1 2 O Power supply IC control terminal
44 PON 5 O SW5V/SW14V control output terminal Hi-Z : OFF, L : ON
45 NC - NC
46 PON CD O MP3 power supply control terminal
47 CD DISC12 SW I 12cm CD disc eject SW detection input terminal L : 12cm disc
48 CD MUTE R I Request for muting signal from CD mechanism L : Mute request
49 NC - NC
50 CE MRST O Reset signal output to CD mechanism L : Active
51 CD DISC8 SW I 8cm CD disc eject SW detection input terminal (Not used)
52 CD LOS SW I Loading start SW detection input terminal L : Loading start
53 CD MUTE L I Request for muting signal from CD mechanism L : Mute request
54 NC - NC
55 CD MSTOP O Request signal (Mechanism is STOP) output to CD mechanism L : Active
56 CD LOE LIM SW I Down SW detection from CD mechanism
57 CD LOEJ I/O CD mechanism loading / eject control terminal H : Eject, L : Loading
58 CD MOTOR O CD mechanism motor loading control terminal H : Loading, Eject, Brake, L : Play
59 DSI O Disc guide illumination control terminal H : DSI ON
60 RESET I Reset input terminal L : Active
61 NC - NC
62 KEY REQ I Request for communication to slave unit L : Key input mode
63 RDS CLK I RDS decoder CLK input terminal
64 LX REQ S I DATA signal input from EXT. unit
65 REMO I Remote control signal input terminal
66 NC - NC
67 VSS0 - GND
68 VDD1 - BU5.0V
69 X2 - Main clock input terminal (10MHz)
70 X1 - Main clock input terminal (10MHz)
71 TEST - GND
72 XT2 - Sub clock input terminal (32.768kHz)
73 XT1 - Sub clock input terminal (32.768kHz)
74 VDD0 - BU5.0V
75 AVDD - BU5.0V
76~78 TYPE0~2 I Destination input terminal DXM6540 (SEL0 : Lo, SEL1 : Lo)
79,80 TUN TYPE0,1 I Electric volume condition setting terminal

8
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
MICROCOMPUTER’STERMINAL DESCRIPTION
●CD SIGNAL MICROPROCESSOR : UPD63712GC (X32 : IC2)
Pin No. Pin Name I/O Description / Processing Operation
1VREFL I Reference voltage input terminal
2AVSS - GND for ADC
3AVCC - Power supply for ADC (BU3.3V)
4NCONC (OPEN)
520RST O Reset control output terminal (for decoder) L : RESET, H : NORMAL
6 20ACK I Acknowledge signal input terminal (for decoder)
720STBY O Standby control (for decoder) H : STAND BY, L : NORMAL
8,9 NC O NC (OPEN)
10 20INT I Interrupt signal input terminal (for decoder)
11 FOGUP I Interrupt for focus gain up control signal H : Focus gain UP, L : NORMAL
12 LZM I 0 bit muting detect (Lch) L : MUTE OFF, H : MUTE ON
13 RZM I 0 bit muting detect (Rch) L : MUTE OFF, H : MUTE ON
14,15 NC O NC
16 20CS O Chip select signal output terminal (for decoder)
17 20LP O Latch pules signal output terminal (for decoder)
18 20TXD0 I/O Serial data signal output terminal (for decoder)
19 20RXD0 I Serial data signal input terminal (for decoder)
20 20SCLK0 O Serial data clock output terminal (for decoder)
21 DSPTXD1 O Serial data signal output terminal (for DSP)
22 DSPRXD1 I Serial data signal input terminal (for DSP)
23 DSPSCLK1 O Serial data clock output terminal (for DSP)
24 AM0 I Select for ROM mode H : NORMAL, L : External ROM mode
25 DVCC - BU3.3V
26 X2 O Oscillator (16MHz)
27 DVSS - GND
28 X1 I Oscillator (16MHz)
29 AM1 I BU3.3V
30 RESET I Reset terminal L : RESET, H : NORMAL
31,32 NC O NC
33,34 EMU0,1 O NC
35 DSPSTB O Data strobe signal output terminal
36 DSPA0 O Command, parameter select signal H : Parameter, L : Command
37 DSPRST O Reset control output terminal (for DSP)
38 DSPINT I Interrupt signal input terminal (for DSP) H : Interrupt
39 /DAC RESET O Reset signal output terminal (for DSP) L : RESET, H : NORMAL
40 SEARCH O Search condition output terminal H : Search, L : NORMAL
41 LOE/LIM_SW I SLT SW detect input terminal H : Inside
42~45 NC O NC (OPEN)
46 PONE5 O +5V AVR control terminal (forVIDEO) H : Power ON
47 PONE2.5 O +2.5V AVR control terminal (forVIDEO) H : Power ON

9
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
Pin No. Pin Name I/O Description / Processing Operation
48,49 NC O NC (OPEN)
50 FLAGIN I C2 error detect terminal L : Correction OK, H : Correction NG
51-60 NC O NC (OPEN)
61 /DAC PD O Reset control output terminal (for DAC) L : RESET, H : NORMAL
62 DVSS - GND
63 NMI I Request for non maskable interrupt signal input terminal
64 DVCC - +VCC
65 DAC MUTE O Muting control output terminal (for DAC) H : MUTE, L : MUTE OFF
66 DAC PON O Audio power supply (for DXM-6550) H : POWER ON
67 PONA5 O +5V Audio power supply (for DXM-6550) H : POWER ON
68 ESRST O Reset signal output terminal (for ES3890) L : RESET, H : NORMAL
69 VMUTE O Video mute control terminal H : MUTE ON, L : MUTE OFF
70 NC O NC (OPEN)
71 SELINT O Video/Audio select output terminal H : NORMAL, L : Interrupt
72 ASEL0 O Audio signal output select control terminal 1 00 : STEREO, 01 : Lch
73 ASEL1 O Audio signal output select control terminal 1 10 : Rch, 11 : Not function
74 NT/PAL O NTSC/PAL select terminal L : NTSC, H : PAL
75 DATASEL O 20F/ES3890 output select H : 20F, L : ES3890
76,77 NC O NC (OPEN)
78 NC (BOOT) I Flash memory writing terminal L : Writing, H : NORMAL
79,80 NC O NC (OPEN)
81 POND3.3 O D3.3V power ON control terminal H : POWER ON
82 MUTEL O Audio muting control terminal (Lch)
83 MUTER O Audio muting control terminal (Rch)
84 SDA I/O I2C data (for system microprocessor)
85 SCL I/O I2C clock (for system microprocessor)
86 MSTOP I Interrupt signal for stand-by mode L : STOP, H : STOP cancellation
87 NC O NC
88 DMUTE O Driver muting control L : MUTE ON, H : MUTE OFF
89 DVCC - +VCC
90 NC O NC (OPEN)
91 DVSS - GND
92,93 NC I NC
94 MSEL I Memory capacity select input terminal H : Capacity Down, L : Capacity UP
95 VCDSEL I NC
96 ASEL I Audio signal output polarity selector H : Reversal output, L : Noninversion output
97 CHSEL I Changer detect input terminal H : Changer, L : Normal
98 SEL0 I Destination input terminal DXM6540 (SEL0 : Lo, SEL1 : Lo)
99 SEL1 I Destination input terminal DXM6540 (SEL0 : Lo, SEL1 : Lo)
100 VREFH I ADC reference power supply (BU3.3V)
MICROCOMPUTER’STERMINAL DESCRIPTION

10
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
TEST MODE
1. How to enter test mode
While holding the FM key and PRESET 6 keys, reset the
unit.
All display segments light up when the test mode is en-
tered.
2. How to exit from test mode
Reset the unit.
Turning ACC off, power off, momentary power down or panel
detaching does not terminate the test mode.
3. Initial status in the test mode
• Sources : ALL OFF (STAND BY)
• Display : All segments were lit.
• Volume : -10dB (displayed as “30”)
• Loudness : OFF
• CRSC : OFF regardless of the presence of switching func-
tion.
• Aux : ON
4. TUNER function
• Forced switching of K3I
Each press of the Preset 6 key inTuner 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 : A
• Forced Wide : M
• Forced Middle :M
• Forced Narrow : N
•RDS check
PCON is power off when RDS data (“RDS test”) received
forTUNER mode.
5. CD function
• Test mode specifications of the CD receiver
•Each press of theTrack Up key jumps to the following track
numbers :
No. 9→No. 15→No. 10→No. 11→No. 12→No. 13→No. 22
→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 tracks of disc is nine or less, unit
playback from a track 1.
• When the media to CD-DA, unit playback from track No.28
by key operation of preset 1 key.
6. AUDIO function
• Audio-related specifications
•Ashort press of the Q key initiates the audio adjustment
mode.
• Pressing the OPEN/CLOSE key on the remote controller
initiates the audio adjustment mode.
• Continuous holding of a remote control key is inhibited.
• Bass, Middle and Treble are adjusted in 3 steps of -8 / 0 /
+8 with the Track Up/down keys (default is 0).
• Balance is adjusted in 3 steps of Left L15 / 0 / R15 Max
with the Track Up/down keys (default is 0).
• Loudness : OFF
7. MENU function
• Menu-related specifications
•Ashort press of the PLAY/PAUSE key initiates the Menu
mode.
• Pressing the DNPP key on the remote initiates the Menu
mode.
• Continuous holding of a remote control key is inhibited.
8. OTHER
• Special display when the display is all on
Pressing the Preset keys while the power is ALL OFF dis-
plays the following information.
[PRESET 1] Version display (Month/Day/Hour/Minute)
[PRESET 2] ALL segment light up for FL display
[PRESET 3] Short press : Display CD operation time.
Long press/hold : Clear CD operation time
[PRESET 5] Short press : Display CD ejection count.
Long press/hold : Clear CD ejection count.
[FM] ROM correction version.
If not mounting ROM correction chip set display
shows ROM No___

11
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
EDCBA
1
2
3
4
5
6
7
PC BOARD
(COMPONENT SIDEVIEW) (FOIL SIDEVIEW)
X16-264x-xx/2652-xx
Ref.No. Address
IC1 4C
Q1 4C
Q2 2C
Q3 2C
X16-264x-xx/2652-xx
Ref.No. Address
IC2 7A
Refer to the schematic
diagram for the values of
resistors and capacitors.
SWITCH UNIT
X16-264x-xx/2652-xx (J74-1561-02)
IC2
D2
D3
D4
D6
D11
D12
D13 D14 D15 D16
D17
D18
D19
D21
D22
D23 D24 D25 D26
D27
D28
D29
D9
D7 D8
D10
D1
ED1
56
1
1 34
2
KS2 KI2
KI3
KI5
KS3
KI4
KS4
KI1 KS5
ATT
TI AUD
VOL UP
VOL DWN
SRC RST 123456
AM FM
CLK
SWITCH UNIT
X16-264x-xx/2652-xx (J74-1561-02)
EB
EB
EB
W1
R2
214
115
R3
C2
C1
1
24
64
41 2540
8065
C3
C4
C5
R1
R4
C11
C13
R5
R6
R7
R8
R9
R10
R11
R12
R13
R21
R22
R23
R24 R25
R27 R28
R31
R33
R41
R32
W2
R29/C12
R42
PANEL SW
ESD-GND
ILL+B
PAN 5V
RST
KS2 KS3
KS4 KS5
KI5
KI1
KI4
KI2
KI3
L-RES
L-CLK
L-CE
L-DATAS
L-DATAL
D-GND
SW5V
ILL-GND
REMO
D31
D32
D33
D34
D35
Q1
Q2
Q3
D36
J1
IC1

12
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
FGHIJ
1
2
3
4
5
6
7
PC BOARD (FOIL SIDEVIEW)
W18
R431
R410
R407
R425 W35
C406
R64
R62
W37
R59
R60
R42
R41
W38
R44
R43
R65 R51
R66
R56
W36
R61
R54
R58
R57
R52
C33
R106
R418
R315
W29
R162 R160
C407
C408
R420
R411
R413
R28
W30
R314
C410
R53
R55
R12
R13
R25
R26 R520 C32
C111
R154
R208
R152
R153
R27
W27
R312
R207
R210
R432
R209
R421 R422
R415 R419
R416 R417
W25
R161 R412
W39
C19
R1
C45
W31
W34
W32
W40
W33
R254
C5
R5
W41
R24
C521
R521
R430
W28
R523
R272
R32
C3
R6
R4
R522
C6 R252
R33
R7 R11
R10
R255
R271
R256
R273
R251
R2
R3
C4
C31
25 1
24 2
R257
R253
TH1
W24
W22
W19
W23
R313
W20
1
2
58
1
31
4
20
21
40
41
60
61
80 1
814
17
43
12
CC
EEB BE
BE
BE
BE
BE BE BE
B
B
BE E
E
BEE
CC
EB
DATA
CLK
10.0MHz
32.768kHz
R63
W241
W240
W237
W230
W238
W235
R21
C21
W223
W228
W220
W224
12 1
5
123
224
1
42
L10
C43 C30
L12
L2/W239
W233
C409
W232
L11
C26
C1
C20
C41
C42
L1
16
1
9
8
C25
C22
C23
C24
C27
C28
C29
C255
C256
C258
R8
R22
R23
X1
R206
C201
C202
C251
C252
C253
C254
C257
R9
R31
R180
R181
R182 R303
X2
W187
W184
W181
W227
W180
W182
W191
W185
W195
W174
W178
W201
W171
W168
W164
W207
W208
W229
W216
W221
W177
W206
W210
W202
W203
W140
W166
W173 W152
W155
W135
W137
W130
W133 W138
W141
W145
W136
W128
W131
W236
W234
W231
W200 W196
W157
W156
W150
W148
W176
W149
W146
W147
W143
W175
W183
W192
W197
W193
W225
W179
W165
W218
W222
W214
W198
W194
W212
W209
W204
W215
W226
W213
W217
W219
W211
W205
W134
W189
W190
W127
W162
W129
W132
W188
W163
W153
W186
W169
W151
W142
W144
W139
W158
W159
W160
W161
W167
W170
W172
D41
Q401
D402
D524
Q41
D201
D202
Q4
D525
Q
D25
Q23
D26
Q22
D22
Q1
Q521
D526
Q2
D521
Q252
Q3
D253
D255
D257
D258
D251
D256
J5
CN5
Q24
CN2
Q21
D1
D3
D21
D23
D31
D522
J1
D156
P1
D2
D4
D5
D269 D270
D271
D523
D24
D254
D252
IC8
IC1
IC6
IC11
IC9
IC3
IC4
ELECTRIC UNIT X25-998x-xx / X34-3172-70 (J76-0016-02)

13
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
ONMLK
1
2
3
4
5
6
7
Refer to the schematic diagram
for the values of resistors and ca-
pacitors.
C301
W14
W18
W39
C204
C203
C205
W15
C206
W42
R211
576109
1311128432
1
W19
C210
W16
W17
W10
R501
W8
C506
C507
R508
C113 C112
W3
W11
C213
R201
C212
R202
R203
R103 R105
W5 W6
R205
W13
R204
R111
W1
W2
R114
R112
R113
C114
C116
C108 C106
R104
R102
R507
W12
C105
W9
C302
C503 C502
C104
R101
R502
R503
61
113
24
12
C356
R355
R351
R356
R352
18
169
18
169
141
31
2
14
15
1
91
28 15
58
14
BE
BE
BE
BE
BE BE
BE
4.332MHz
W241
C211
C115
L7
R172
L6
L8
C117
C209
C251
C
254
C303
C351
C352
C504
L3
R171
R173
R174
R175
R176
R180
R182
R183
R301
R302
R303
R304
R305
R306
R307
R308
R309
R310
R311
R357
R358
R374
X3
W115
52
L9
R505
R506 R504
W106
W112
W101
W119
W117
W100W110
W118
W114
W113
W111
W105
W104
W103
W107
W108
W116
W130
W133
W121
W120
W109
W123
W136
W126
W128
W131
W134
W122
W124
W127
W129
W132
Q151
D401
D205
D203
Q501
Q201
Q101
Q350
Q351 Q352
J3
J2
J5
WH1
CN3
WH2
D159
D301
D307
D308
D309
D310
D311
D151
D157
D158
D162
CN4
CN6
CN1
D501
D502
D503
J4
2
IC11 IC2
IC10
IC7
6-02)
X25-998x-xx
X34-3172-70
Ref. No. Address
IC1 6I
IC2 5K
IC3 4G
IC4 2J
IC6 5I
IC7 6M
IC8 6H
IC9 5G
Q1 3H
Q2 3I
Q3 3I
Q4 5I
Q21 2G
Q22 3G
Q23 4H
Q24 3F
Q41 5G
Q101 5L
Q151 6K
Q201 5L
Q252 3I
Q350 3L
Q351 3L
Q352 3L
Q401 7G

14
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
PQRST
1
2
3
4
5
6
7
PC BOARD (COMPONENT SIDEVIEW)
X32-5500-00
Ref.No. Address
IC3 4Q
IC6 5R
Q4 5Q
Q5 5S
Q7 5R Refer to the schematic diagram for the values of resistors and capacitors.
S
D
G
EB
C52
C44
C25 C29
C50
RFOK
R12
C3
C8
C10
C11
C13
C15
C27
C35
C37
/RESET
MIDIO
MIACK
C41
C46
C32
CP6
R27
R47
C18
CP2
CP3
CP5
CP7
CP11
R6
R13
L1
R42 R46
R48
R49
R50
R63
R38
CP12
CP15
CP13
R68
CP14
R65
R67 C69
C67
C66
R66
R69
C72
1
34
5
1
1633
48
32 17
6449
BEC
CBE
Q5
Q4
Q7
S1 S2
S3
S4
IC3
IC6
CD PLAYER UNIT X32-5500-00 (J74-1552-12)

15
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
YXWVU
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
C54
L2
R21
C24
C71
R54
R56
R53
R58
C57
C56
R57
C63
C58
R60
R62
R59
R61
R52
R5
CP1
R10
C12
C5
R70
R2
C7
R9
R34
C28
R36
R35
C6
C34
R22
R37
C30
C31
R43
C26
C21
R29
R64
C38
R45
R44
C53
R40
C51
C48
C49
R51
C36 C47
CP4
R23
C16
X2
C14
R18
CP16
R14
R11
R7
R8
R17
R15
R16
C9
C19
C4
R1
C70
C42
C20
R31
R33
R32
C22 C23
R24
R25
C17
X1
R3
R4
C1 C2
C68
C64
C43
C33
R28
C45
CP9
CP8
C59
C55
R55
CP10
C60
R39
C61
C62
C39
1
16
1
100 25
51
75
76 50
26
1
34
5
3
1
4
5
241
45
31
25
15
26 1
50
100
76
7551
16
130
BEC
CEBBEC
ECB
13
45
S
D
G
EB
EB
EB
BU5V
S.7.5V
FCS
TRK
/MUTEL
/MUTER
SLED
SD
TD
S.GND
MOTOR
SPDL MD
FD
/MSTOP
LIM-SW T2
INT
T1 /RST
T3 T4
FLAGIN
SEARCH
/RESET
BU3.3V /STB
TXD1
/MICK
CLK
A0
/BOOT
/MILP
RXD1
LZM
RZM /MIRST
/MICS
POND3.3
XI
FOGUP
/MRST
SLED IN
LD
LO/EJ
DGND
/EJECT
/LOAD DATA
SLED OUT
/MUTER
D5V
8EJE
LOE/LIM
D.GND
FCS UP
D3.3V
TRK IN
TRK OUT
FCS DOWN
LOS Lch
/MUTEL
Rch
/MSTOP
PON
T
ADCIN
/CLK
FE
D.OUT
Vref
VR
IOP-
PD
C+D
VCC
TE
RF
ARF
F
E
F
A
B
SDO
SPDL+
SPDL-
A.GND
DAVdd3.3V
12EJE
A.+8V
BU2.5V
LRCKIA
D.GND
SDIO
MIRR LOCK HOLD
TZD
BCKIA
TXO
FZD
IOP+ GND
ATEST
FLAG
TX
Vref
REQ
STBY
Q6
Q3
Q10
CN1
D3
Q8
Q9
D2
CN2
Q1
IC2
IC4
IC5
IC1
IC9
IC7
IC8
CD PLAYER UNIT X32-5500-00 (J74-1552-12)
Refer to the schematic diagram for the values of resistors and capacitors.
X32-5500-00
Ref. No. Address
IC1 5X
IC2 2W
IC4 5V
IC5 3V
IC7 4W
IC8 3X
IC9 3W
Ref. No. Address
Q1 5X
Q3 5V
Q6 5W
Q8 2V
Q9 3V
Q10 3V

16
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
ABCDE
1
2
3
4
5
6
7
X25-998x-xx/X34-3172-70 (1/3)
4.7K
22K
22K
47K
47K
4.7K
4.7K
47K
47K
47K
10K
4.7K
2.4V
2.4V
4.9V
0V 0V
4.9V
5V
0V
0V
5V
0V
4.9V
4.0V
4.0V
4.0V
4.0V
0-5.0V
0-5.0V
4.2-4.9V
0V
0V
4.9V
5V
0V
3.5V
0.5V
4V
0V
0-2.0V
4.0V
8.1V
0V
4.1V
4.1V
4.1V
4.1V
0V
4V
0V
4V
4V
0V
4.0V
5.1V
0V
4V
0V
4.0V
0V
8.1V
0V
0V
4V
4.0V
4.0V
IC7
IC10
IC2
(X25-998x-xx)
ELECTRIC UNIT
∗
D156
P1
∗
J5
D162
∗
D159
∗
D158
∗
D157
∗
D525
∗
D151
∗
Q151
CN5
D521
CN2
∗
D524
Q521
ANT.
J4
Q101
TUNER
CN1
∗
CN3
∗
CN4
D502
D503
D501
CN6
Q501
∗
D205
WH1WH2
Q350
∗
D202
∗
D201
Q201
D203
Q351 Q352
PRE OUT J3
D522 D523
RDS DEMODULATOR
ELECTRONIC
FM MPX DETECTOR
VOLUME &
SELECTOR
FM/AM
SW
∗
B
∗
E
∗
G
∗
F
MARIN REMO
WIRED REMO
∗
A1
to SWITCH UNIT (X16- ) (J1)
14
3
ESD-GND
L-RST
7
PON 5
TDF DET
131415
L-CLK
10
L-DATAS
REMO
1112
L-DATAL
L-CE
89
470
LED+B
RST
56
PANE 5V
ILL GND
LED+B
234
D GND
1
R181 10
470 470
FSEL
EXTRES
OSCIN
OSCOUT
TP654
C117
2.2u50
7
FILOUT
ARI
8
GND
OSEL
MPX
VREF
6
5
4
10
TM 9
12
13
VCC 11
C114
0.01
C115
10u16
∗
W39
TP653
TP652 L9
4.7uH
C113
10P
CD DISC12 SW
75
R522
10K
C521
0.1
R523
R521
47K
D-OUT
2
1
R51 2.2K
R520
1K
R65 4.7K
AUDIO OUT
RDCL
C116
330P
RDDA
QUAL
2
115
16
T57
R112
2.2K
R111
4.7K
IF1 GND
AMIF OUT
IF1+B
S-METER
21
22
24
23
0.01
C108
TP122
4.7uH
L8
C112
10P
C111
1000P
2.2K
R106
C105
PLL+B
DIG GND
VDD 5V
RDS OUT
NOISE OUT 18
19
20
17
SDA
IFC OUT
SCL
13
16
15
14
OSC GND
W/N
OSC GND
V1 11
12
10
9
AM+B
OSC GND
NC 6
5
8
7
C106
0.01
4.7uH
L7
C104
0.01
4.7uH
L6
0.052uH
1
RF GND
FM ANT
AM ANT
OSC GND
3
4
2
L3
R105 R103
4.7K 4.7K
0.01
1K
∗
R374
2
1
2
1
TP371
R504C502
R507 1K
0..22
C504
22u10
10
R506
4.7
C351
10u16 R351
270
C503
0..22R505
10 AUX L
1
R503
180K180K
R502
GND AUX R
23
R357
100
9
20
R209
2
134
8VSS
7
6
5
VEE
INH
Z0
ZCOM
9
C
B
A
X0
X1
10
11
12
C507
0.1
1K
R501
47K
R508
3
2
Z1
Y0
Y1
1
XCOM
YCOM
VDD
14
15
16
1
C506
0.01
C201
C209
2.2u50
0.47u50
C202
0.47u50
L10
4.7uH
C211
47u10
C210
0.01
CDGND CASSR CASSL
∗
R211
1K
CREF VREF
3
2
1
6CDR 5
4
RH- CDL
8
7
LFOUT 26
27 28
ACOUTR
ACOUTL
21 22 23 24 25
LROUT
RFOUT
GND
VDD
RROUT
6345 78 9
∗
W113
∗
W111
∗
W114
R210
4.7K
R203
4.7K
MPOUT LEVEL MPX AM AFS
11
10
MPIN
14
13
12
MUXL 15
16 17 18 19
SMUTE
SCL
SDA
MUXR
QUAL
R207
470
R208
470
4.7K
R204
4.7K
R205
2.2K
30K30K
R352
C352
10u16
270
R355 R356
R358
100
TP157
TP164
TP163 TP162
TP165
TP158 TP161 TP160 TP159 TP156
TP154 TP153
TP152
TP151
TP51
TP52
TP351
TP353
TP352
TP503
TP502
TP501
TP113
TP114
TP115
TP120
TP104
TP102
47
∗
R172
1K
∗
R183
1K
R171
100
R174
1K
R180
1K
R182
1K
R176
470
R175
47
213
VIDEO OUT
D GND
PARK SW
TP521 TP523 TP522
TP100TP650
TP651
X3
4.332MHz
2.2K
R114
2.2K
R113
470
R104
470
R102
1K
R101
0.022
C203
C206 150P
C204 0.01
1K
∗
R206
14
13
63
0.1
C212
0.1
C213
0.47
C205
R201 10K
R202 4.7K
R152R173
60
10
65
9
62
5
8 6
R154
470
R153
2.2K
R160
R161
R162 100K
TP525 TP526
TP524
TP527
TP528
TP529
TP530
TP532
TP531
TP534
TP533
TP535
TP537
TP536
TP538
TP539
TP540
TP541
2
1
3
1
2
3 5
4
6
FR
FL
RR
RL
FL
FR
R
G
5
6
5
6
38
1
19
20
21
2.2M
SDA
SCL
11
2
22
24
23
REMO CONT
REMO.CONT
PARK SW
AUX IN
AUX
VIDEO OUT
+
+
+ + +
+
+
+ +

17
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
JIHGF
X25-998x-xx/X34-3172-70 (2/3)
14.4V
0V
0V
2.3V
5.0V 0V
12.8V
0V
5V
0V
5V 4.9V
0V
5V
0V
5V
0V
5V
0V
0-5.0V
0-1.4V
0.6-4.1V
0V
0V
5V
5V
0V
4.9V
0V
0V
5V
0V
4.9V
0V
4.9V
4.9V
0V
0V
5V
5V
0V
0V
5V
5V
0V
4.9V
0V
5V
0V 0V
5V
0V
4.9V
5V
0V 5V
0V 5V
0V
0V
4.5V
0V
4.9
V
5V
0V
0V
5V
0V
0V
6.7V 6.7V
0V
4.9V
0V
0V
14.4V
0V
14.4V
6.7V
0V
0V
4.4V
0
5
4.9V
0V
5V
0V
0V
5V
5V
0V
0V
5V
0V or 5.0V
5.0V
0V
0V
5V
3.5V
0V
IC4
IC6
∗
IC1
IC9
N2
D310
D311
J2
D308 D309
D307
D301
Q252
D252
D254
D256 D258
D41
Q41
Q3 D4
Q2
D5
Q1
D31
D2
D3
Q24
D21
Q22
Q21
D251
D257
D255 D253
J1
BU DET
SERGE
MUTE
D271
D269 D270
J3
SW14
SERVO
CD
MECHA +B
SYSTEM
MICROPROCESSOR
MUTE
DRIVE
AUDIO
IC
POWER
DC IN
LINE
ACC DET
DET
∗
H
∗
C
LX-BUS
to CD MECHANISM ASSY
∗
A
4.7
CD LOE LIM SW
CD DISC8 SW
CD DISC12 SW
14
R54 1K
D-OUT
2
1
AUDIO+B
(SW1)
CD LOS SW
(SW2)
CD-SDA
CD-SCL
5
4
38 7
6
Rch
GND
Lch
CD MUTE L
CD MUTE R
11
10
913
12
R51 2.2K R52 2.2K
R53 1K
CD LOEJ
(SW3)
19
CD MSTOP
CD RST
(SW4)
16
15 18 17
DGND DGND
BU5V
D4.5V D4.5V
22
21
20 24
23
SERVO+B
CD MOTOR
SERVOGND
R58 2.2K
R66 4.7K R65 4.7K
∗
R64 4.7K
R63 2.2K
R432
10
9
12
11
C302
R352
C352
10u16
270
C356
0.1
R358
100
C303
47u10
MUTE
REQ M
GND
CON
B.U.
Rch
A GND
RST
48
2
3
6
7
15
0.47
C301
0.47
DATA M
DATA S
Lch
CLK
REQ S
13
R251
33K
R273
470K
R272
10K
R271
100 C256C255 1u50
R252
47K
MUTE
NC
40
39
38
37
49 48
47
46 45
44
43
42
PS2 0
41
PS1 2 PS1 1 PS1 0
PARK SW
BU DET
PS2 1
CD MUTE R CD DISC12 SW PON CD NC PON 5 RESET
K
E
R
L
X
60 59 58
57
56 55
54
53
52
50
CD MUTE L CD LOS SW CD DISC8 SW CD MRST
51
NC CD MOTOR CD LOEJ CD LOE LIM SW CD MSTOP DSI
AUX ON
RDS QUAL
RDS DATA
PWIC BEEP
LX DATA S
LX DATA M
LX CLK
TUN SCL
TUN SDA
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
LX MUTE
PWIC MUTE
RESET2
ACC DET
VSS1
PWIC STBY
PWIC SVR
LX REQ M
SCL
LX CON
LX RST
NC
RDS AFS
TUN IFC OUT
SDA
17 20 18 19 15 16 12 13 14
TUN SMETER
RDS NOISE
LINE MUTE
L RST
AVREF1
L DATAL
L DATAS
L CLK
TDF DET
TU
N
TU
N
6 9 10 11 7 8
AVSS
L CE
4 5 1 2 3
C43
220u16 L12
220uH
R44 47K
0.22
100u25
100u25
VIN
GND
ON/OFF
4
2
VOS SWOUT
R43
47K
R41
47K
5 1 3
47K
C45
R42
C42
C41
R31 10K
R7
3A1
Y1
2
1
Y2 B1
5
412
Y4
VCC 13
14
Y3
A4 B4
10 11
100K
C5
0.01
R10
10K
C4
0.01
R11
22K
100K
R3
39K
R2
R6
10K
1000P
C3
R5
10K R4
20K
R32 22K
R1
68K
R33
47K
C21
47u16
C19 R21
0.47 1.5K
REAR L+
8
33u10
0.22u50
0.22u50 0.22u50
0.22u50
C257
1u50
C258
1u50
ACGND
OUT1- SGND OUT1+ OUT2- OUT2+
7
RR-
RR+
TAB
1
3 5
FR-
FR+
11
9
IN1
13
PGND1
6 4 8 2
PGND2
STBY
VCC1
14 16 10 12
SVR
IN2
IN4
OUT3+ OUT3- OUT4+ OUT4-
RL-
FL+
FL-
RL+
19
IN3
15
17
23
21
25 HSD
24 22 18 20
PGND3
MUTE
VCC2
PGND4
FRONT L+
FL+
935467
FR+ FRONT R+
FRONT R-
FRONT L-
RL-
RL+
FL-
FR-
RR-
REAR L-
REAR R-
RR+ REAR R+
P-ANT
P-CON
1210 11 13 14
TP51
TP55
TP53
TP54
TP52 TP60
TP57 TP58 TP59 TP56 TP64 TP62 TP63
TP61 TP66
TP67
TP65
TP72 TP71 TP69 TP74 TP73
TP307
TP306
TP304
TP301
TP305
TP311
TP310 TP309
TP308
TP312
TP313
TP303
TP302
C31 0.01
C251C252
C253
C254
TP2
TP1
TP5 TP3
TP4 TP7
TP6 TP9 TP8
TP11
TH1
4.3K
R257
10
R254
4.3K
R253
+
220
R255
22K
R256
4.7K
R308
4.7K
R305
4.7K
R309
100
R311
100
R310
4.7K
R307
10
R301
10
R302
4.7
R306
4.7K
R304
100
R303
R312 100K
100K
R313
100K
R315
100K
R314
R61 100K R62 100K
R430 47K
R431 47K
47
52 48
53 50 55
51
56
57
58
SDA
SCL
1K
R55
1K
R56
2.2K
∗
R57
100
R59
2.2K
R60
TP606 TP608
TP607
TP609
TP605
TP604
TP603
TP602
TP601 TP600
9
11
10
8
5
6
63
14
13
20
19
16
17
18
24
23
22
28
27
26
29
40
39
41
42
44
37
35
36
31
32
60
27
29
R
G
FR
RL
RR
FL
FR
15
2
21
38
64
1
34
+
+
43
46
46
47
48
58 50
51
52
53 55 56
57
64
26
17
18 16
28
35
15
32
31
34
++ +
+
+
+
+

18
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
ONMLK
1
2
3
4
5
6
7
X25-998x-xx/X34-3172-70 (3/3)
0V
14.1V
14.0V
8.1V
7.9V
8.1V
14.3V
5.0V
0V
4.5V
9.9V
2.0V
2.4V
0V
4.9V
13.2V
0-5.0V
0-1.4V
0V
5V
5
V
0
V
5
V
0
V
0V
4.9V
5V
0V
0V
5V
0V
5V
5V
0V
0V
5V
4.9V
0V
0V
5V
0V
5V
0V or 5.0V
0V or 5.0V
5.0V
4.9V 0V
0V
10.3V
0V
0V
5.0V
5.0V
IC8
IC3
DC CORD
DC CORD
(E30-6286/E30-6132)
(E30-6027) : RX-492WMP
(E30-6322/E30-6323)
DC CORD
KDC-W4527/Y/G/GY
KDC-W427Y/MP225
KDC-MP4026/G/V
KDC-225/2025/225MR
KDC-MP225 (1/2)
D401
D402
Q401
D41 SFPB-54VNF
D151,157-159,162,301,
D524-526
D402
D205
D156
D201,202
DA204U
B30-1567-05
1SS400
MAZ4120-L
EDZ6..2B
MAZ4062-L
SN74HC02NSR
CD4053BNSR
E-TDA7560
SI-8050JF3NF
PST3436UL-E
E-TDA7479AD
BA4911-V4
E-TDA7407D
IC6
IC9
IC10
IC7
IC8
IC3
IC4
IC1
IC2 D2-4,309,310,501,502
D23,24,252,254
D26,203,401,521
D22,25,251,253,255-258
D21
D31
D5,269-271
D1
MAZ4082N-L
DAN202U
D1F60-5063
MAZ4047-M
AM01ZNF
1SS133
S2V60∗A
MAZ4068N-M
Q
3D4
D26
Q4
∗Q23
∗D526
D24
∗D25
∗D23 D22
D1
:
:
:
:
:
:
:
:
:
∗
DTC143TUA
DTA114YUA
2SA1576A
DTA124EUA
DTC144EUA
DTA144EUA
2SB1565(E,F)
2SA1036K
2SD1858
UMC2N
2SC4081
Q101,201,351,352
Q350
Q501
Q521
Q151
Q252
Q22,23
Q24
Q1-3,41,401
Q21
Q4
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
307,308,311,503,522,523
DSI
RESET
IC
POWER
SUPPLY IC
A
CC DET
PON 5
∗ D
(X25-998x-xx)
SIGNAL LINE
B LINE
GND LINE
4.7uH
W29
REMO
RESET
KEY REQ
RDS CLK
LX REQ S
60
NC 61
62
63
64
TUN SMETER
RDS NOISE
LINE
MUTE
TUN TYPE0
TUN TYPE1
XT1
X2
NC
VSS0
VDD1
65
66
67
68
X1
TEST
XT2
69
70
71
72
TYPE 1
VDD0
AVDD
TYPE 2
73
74
75
76
TYPE 0
77
78
79
80
1 2
NC VDD
C406
0.22
32
VSS
4VOUT 1
10.000MHz
47K
R410
X1
240
R425
1K
R407
TP401
C408
C407
32.768kHz
R420
10K 22P
22P
∗
R417 22K
∗
R412 22K
22K
R415
TP610
TP611TP612
∗
R416 22K
∗
R411 22K
47u6.3
C409
0.01
C410
10u16
C25
C26
10u25
∗
W239
69
A2 Y2
B1
5
4
Y3
A4
B4
10 11
GND B2
7A3
B3 8
C6
0.01
R10
10K
C4
0.01
1/2W
R8
3.3K
R9
33K
∗
C33
0.01
TP20
R13
5.6K
R12
47K
L11
R28 1K R27 1K R26 1K R25 1K
C32 0.01
*R24 1K
C28
∗
C30
100u16
220u16
C27
10u50
ILM
SW2
SW1
VBU
VDD
VCC
12
11
10
9
8
7
AUDIO
AM
FM
PANT
PCON
GND
3
6
5
4
2
1
10u16
∗
C20
100u16
C29
C24
10u16
∗
W34
∗
R23
4.7K R22
4.7K
C22
∗
C23
10u25 10u25
2134
ACC
P-ANT
PHONE
P-CON
GND
140uH B.U.
∗
C1
13 14 FUSE
F1 10A
1615
∗
L2
27uH TP14
TP16
++
+
+
+
+
+
+
+
+
TP29
TP30
TP32
TP31
TP24
TP25
TP26
TP27
TP28
TP21
TP23
TP22
TP12
TP9
TP11
TP13
TP15
TP10
L1
X2
63
60
1
44
65
62
37
36 35
10
11
10
11
43
42
40
39
41
KDC-MP225
KDC-W4026G
KDC-MP4026
KDC-225/2025
MODEL NAME C1
2200u16
0-21
0-10
0-11
UNIT
No.
YES
NO
YES
YES
YES
YES
ACB
NO
YES
YESNO
25
D23,
CN4
KDC-225MR
RX-492WMP
KDC-W4527Y/GY
KDC-MP4026V
0-12
0-01
0-22
2-71
YES
NO
YES
YES
YES NO
NO
YES
YES
YES
YES
NO
NO
YES
FEDGH
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
KDC-W4527/G
YES
KDC-W427Y 2-72 YESNO YES 3300u16
NO
NO
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
NO
YES
YES
YES
YES
YES
NO
NO
YES
NO
YES
C20
NO NO
NO
YES
NO
YES
NO
NO
NO
YES
C23 C33
YES
NO2200u16
2200u16
2200u16
2200u16
2200u16
3300u16 220u16
100u16
C30
100u16
100u16
100u16
100u16
100u16
220u16
NO
YES
NO
NO
CN3
NO
YES
NO
NO
NO
NO
NO NO
YES
NO
D151,
YES
YES
YES
YES
YES
YES
159
YES
YES
YES
NO
YES
158
YES
YES
D156-
YES YES
YES
YES
NO
NO
202
D201,
NO
NO
NO
NO
YES
NO
NO
524-526
D205,
NO
NO
NO
NO
IC1
X86-3760-11
A1
X86-3760-11
X86-3762-70
X86-3760-11
X86-3760-11
X86-3760-01
X86-3760-11
X86-3762-70
YEL
VIOL
VIOL/BLK
GRN/BLK
GRN
BLK 161
BLU/WHT
P. CONT
ACC
ANT CONT
143
RED 152
BLU 134
GRY/BLK
WHT/BLK
GRY 11
12
6
5
9
10
8
7
WHT
BATT
TEL MUTE
BLK
GND 161 YEL
RED
BLU/WHT
BLU
GRY
GRY/BLK
WHT/BLK
WHT
FRONT R
P. CON
ANT CONT
ACC
FRONT L
REAR R
VIOL
14
15
3
2
BRN
12
13
5
4
VIOL/BLK
GRN/BLK
10
11
7
6
89 GRN
REAR L
BU
RR+
RL-
FR+
RR-
FL-
FL+
FR-
RL+
P.CON
ACC
B31
42
57
68
A3
4
1
2
B.U
5
6
7
8
GND
15
14
16
BLU/WHT
1
RED
BLK 2
3TEL MUTE
BRN
YEL
ANT CONT
9
12
11
10
13
WHT/BLK
BLU/WHT
GRY/BLK
P CONT
FR+
FR-
FL-
4
GRY 5
6
7
FL+ WHT 8GRN/BLK
VIOL
VIOL/BLK
RR+
RL-
RR-
GRN RL+
34
∗
R422 22K
∗
R421 22K
R419
22K
NO
NO
NO
NO
NO
NONO
0-11
2-72
0-12
0-22
0-01
2-71
0-21
No.
0-10
UNIT R172,
YES
NO
NO
YES
NO
YES
NO
NO
Q23
E58-0992
E58-0992
E58-0992
E58-0992
E58-0993
YES
YES
NO
NO
NO
E58-0992
E58-0992
E58-0992
NO
NO
J5
NO
L2
NO
NO
YES
NO
YES
YES
YES
YES
NO
NO
YES
YES
NO YES YES
NO
NO
NO
YES
NO
YES
NO
YES YES YES
YES
NO
NO
411
R24,
YES
YES
YES
YES
Q151
YES NO
R23
NO
NO
YES
YES
NO
64
R57,
YES
183
NO
YES
NO
NO
NO
NO
NO
NO NO
NO
NO
NO
NO YES NO
YES
YES
YES
NO
NO
YES
NO
NO NO YES
NO
YES
YES
R374
YES
NO
NO
NO
R211
NO
R206
NO
YES
NO
YES
NO
R412
YES NO
R416
NO
NO
YES
YESNO
YES
YES
YES
NO
YES
NO
NO
YES
NO
YES
NO
NO
NO
NO
NO
NO
NO NO YES
YES
YES
YES
R422
NO
NO
NO
YES
NO
R421
YES
R417
YES
NO
NO
NO
W34
NO NO
W39
YES
YES
NO NO YES
NO
NO
YES YES YES
YES
YES
YES
YES
113,114
YES
W111,
YES
W239
78422GC232A
78422GC233A
78422GC233A
78422GC231A
78422GC231A
78422GC231A
78422GC231A
78422GC231A
+
+
CAUTION:Forcontinuedsafety,
replace safety critical compo-
nents only with manufacturer’s
recommended parts (refer to
parts list).
Indicates safety critical com-
ponents. 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 volt-
meter. Values may vary
slightly due to variations be-
tween individual instruments
or/and units.

19
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
PQRST
1
2
3
4
5
6
7
X16-264x-xx/2652-xx (1/2)
10K
10K
0V
0V
5V
0V 1.6V
3.3V
5.0V
5.0V
OFF ON
5V
0V
0V
5V
0V
5V
0VOFF
ON
5V
0V
5V
0V
5V
0V
0V
5V
IC2
IC1
∗
ED1 (SEGMENT)
∗
ED1 (COMMON)
SWITCH UNIT (X16-26xx-xx)
to MAIN UNIT
ILLUMINATION
KEY
∗
Q2
∗
Q3
RESET
CONTROL
REMOTE
S23 LCD DRIVER
J1
SW
Q1
IC
SW
∗
A
D36
D35
D34
D33
D32
D31
KI2
+5V
S8
S8
RST
D-GND
PAN 5V
LED+B
NC
ILL-GND
L-RES
L-DATAL
L-CE
L-CLK
L-DATAS
+B
+B
KEY
Q2,3
1
∗
R12
∗
R13
2.2K 2.2K
S5
S4 S7
S6
RED GREEN
2
3
S7 S6 S5 S4
5
4
6
7
8
6
TP2
TP1
+5V
1
2
TP4
TP3
5
3
4+B
4.7
C2
0.01
IC2
+5V
79
80
78
77
76
TP7
TP6
TP5
7
8470
1K
TP9
TP10
TP8
10
9
11
470
470
1K
GND1 GND2
2
4VCC
OUT 1
3
74
4.7K
L-DATA S
L-DATA L
76
47K
78
80
79
76
77
L-CE
79
80 L-CLK
77
78
L-RES
1000P
R1 56K
C1 75 OSC
TEST
KI5
KI5
C3 0.047
C4 0.047
+5V
73
72
VSS
VDD2
71
70
VDD1
VDD
KI4
KI3 68
69 KI4
67 KI3
S18
S18 S13 S10
S9
S12
S11
S15
S14 S17
S16
S13 S12 S11 S10 S9
11
9
10 13
12
S17 S16 S15 S14
16 15
14 17
18
S19 S20 S23
S21
S22
S24 S23
S21 S22 S19 S20
21
20 19 23
22
S24
24
32
S27 27
S25
S26 26
25
S29
S28 28
29
S31
S32
S30
31
30
37
S35
S33
S34 33
34
S36
S37
35
36
S40
S38
S39 38
39
40
C2
COM2
SW5V
REMO
PANEL SW
ESD-GND
47
TP13
TP11
13
12
14
R11
+5V
TP12
TP14
15
C5
2.2
64
KI1 65
66 KI1
KI2
KS3 KS5
KS4
KS6
63 61 62
S56
KS2
COM3
60 58 59 57
KS3 KS5
KS4
KS2
S56
C3
16 3 2 1 4 5 11 10 8 6 7 9 15 14 13 12 20 19 18 17 21 25 26 22 23 24 29 30 27 28 31 36 35 34 33 32
S47 S47
S52
S53
S54
S55
COM1
54 56 55 52 53
S49 S48 S50
S51
49 50 51 48 47
S52
S55
C1
S53
S54
S50
S51
S48 S49
S42
S44
S43 S46 S45 44
45 46 42 43
S41 41
S46 S45
S42
S43
S44
S41
47 42 40 39 38 37 41 46 45 44 43 52 50 48 49 51 54 55 53
16 3 2 1 4 5 11 10 8 6 7 9 15 14 13 12 20 19 18 17 21 25 26 22 23 24 29 30 27 28 31 36 35 34 33 32 47 42 40 39 38 37 41 46 45 44 43 52 50 48 49 51 54 55 53
C1
C2
∗
W2
1K
R10
R2
R9
R8
R7
R6
R5
R4
R3
S53 S56 S55 S43
S51
S50 S49
S52
S54
S4 S7
S6 S5 S8 S9
S45 S48
S47 S17
S16 S15
S14
S12
S10 S13
S11
S36
S37
S38 S39 S35 S40
S42
S44
S46
S41
S26
S27 S24
S22
S23 S25 S20 S18 S19
S21
S34
S33
S32
S30 S28 S29
S31
ESD-GND
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.

20
KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
YXWVU
1
2
3
4
5
6
7
X16-264x-xx/2652-xx (2/2)
DTA114EE
DTC143TUA
2SA1036K
2SA1576A
2SC4617
2SC4081
DTA124EUA
UMC2N
DAN202U
DTA114YUA
TC7SH08FU
2SB1565
2SD1858
ECB
KDC-MP225 (2/2)
D1
D2
VOL
LIGHT
BACK
∗D3
D6
∗D7
∗D8
D4
Q & SRC
∗D21
∗D22
∗D23
∗D12
∗D9
UP
DOWN
VOL
∗D10 ∗D13
VOL
∗D11
∗D15 ∗D25
ATT
TI
∗D16 ∗D26 ∗D24
∗D14
∗D18 ∗D28
∗D29
4
∗D19
5
3
6
∗D27
2
∗D17
1AM
FM
AUD
S21
CLK
S22
AM
S16
TI
S17
S12S11
FM 6
5
S6 S7
S1
4
S2
ATT
S19
SRC
S20
S15S13
1
S18
VOL
DOWN
2
S14
VOL
UP
S4
S8 S10
S9
3
S3 S5
B LINE
GND LINE
:
:
:
:IC1
Q2,3
IC2
Q1 D7-19,21-19 : ∗
2SC4617
DTA114EE
LC75883E
RS-171 D2 B30-1567-05:
CLK
D3,4 B30-1564-05:
D31-35
D36 UDZS5.6B DA204U:
:
D1 : B30-1633-05
270 270
TP24
R25 R28
0.01
C11
S23
S22
S24 S23
S22
23
S24
24
+B
S40
S39
S38
S37
S36
S34
S33
S32
S31
S30
S29
S28
S27
S26
S25
S35
32
S27 27
S25
S26 26
25
S29
S28 28
29
S31
S32
S30
31
30
37
S35
S33
S34 33
34
S36
S37
35
36
S40
S38
S39 38
39
40
R23
430
R22 R21
220
∗
R29
220
220
R27
270
R24
300
270270
0.01
∗
C12
C13
0.01
∗
R42
TP38
+B
∗
R41
TP22
KS2
TP21
KS3
TP23
∗
R31
KS4
TP25
KS5
TP27
TP26
∗
R32
TP28
+B
∗
R33
S42
S43
42
S41 41 S42
S43
S41
TP34
KI4
KI5
TP37
TP36
TP35
KI3
TP33
TP32
KI2
TP31
KI1
TP30
TP29
+B
52
56 54 55 53
52
56 54 55 53
C1
C3
C2
+B
S34
S33
A
(X16-264x-xx)
MODEL NAME C12
KDC-225/MP225 KDC-W4527 KDC-W4527G KDC-W427Y KDC-2025/225MR KDC-MP4026/G/V RX-492WMP
2-71
2-72
YES
NO
0-12
0-21
2-70
YES
YES YES
No.
0-01
0-11 YES YES
UNIT D3 D21-29
D7,8 D9,10
B30-1566-05 B30-1566-05
B30-1564-05
NO B30-1565-05
ED1 Q2,3 W2
B38-1145-05 B38-1136-05
NO
330 330YES
NO 33
R31-
NO
D11-19
B30-1575-05 B30-1565-05
R12,
13 YES
YES
41,42
R29,
A
(X16-265x-xx)
MODEL NAME C12
KDC-W4527GY KDC-W4527Y No.
2-70
2-71
UNIT D3 D21-29
D7,8 D9,10 ED1 Q2,3 W2
33
R31-
D11-19 41,42
R29,
NO NO NO
YES B30-1564-05 B38-1136-05 330NONO B30-1565-05 YESNO NO NO
B38-1136-05 330NO NO B30-1565-05 YES
YES YES B30-1564-05 B38-1145-05 390NONO B30-1566-05 YESNO NO NO
B30-1564-05 B38-1137-05 390NO
NO NO NO NONO B30-1566-05 YESNO NO NO
R12,
13
YES
NOYES B30-1633-05
B30-1633-05 B30-1566-05 B30-1566-05NO B30-1565-05 B38-1144-05 NO330YESB30-1565-05 YESYES NOYES YES
NOYES B30-1566-05 B30-1566-05NO B30-1565-05 B38-1145-05 NO330YESB30-1565-05 YESYES NOYES B30-1566-05 B30-1566-05NO
D1
B30-1633-05
D1
B30-1633-05 B30-1633-05 B30-1566-05 B30-1566-05B30-1566-05
B30-1633-05
B30-1633-05 B30-1633-05 B30-1641-05
B30-1565-05 B38-1144-05 NO330YESB30-1565-05 YESYES
NO