Kenwood KDC-225MR, KDC-2025 Schematics
A B C D E
0V
2
(S )
2
47
KDC-225/225MR/2025
∗
1
ELECTRIC UNIT
(X25-998x-xx)
∗
G
2
1
6345 78 9
CN1
1
2
WH1WH2
3
2
3
546
F
AUX IN
GND
AUX R
AUX
CN6
1
AUX L
1
23
PRE OUT
J3
R507 1K
0-2.0V
3.5V
0.5V
MPX
11
0.47
C205
R202 4.7K
C206 150P
Q521
47K
E
D521
R522
CN5
TP351
TP352
100
R357
R355 R356
Q351 Q352
270
4.7K
R351
+
C351
10u16
FL
Q350
22K
22K
2
R204
Q201
2.2K
R205
4.7K
4.7K
151617
QUAL
MUXL
MUXR
4V
0V
10K
PARK SW
MPOUT
LEVEL
MPIN
12
13
14
0-5.0V
0-5.0V
4.2-4.9V
R203
4.7K
0.1
C212
47K
C521
0.1
C213
38
1K
R520
47K
R521
D522 D523
0.1
75
TP523
R523
TP522
213
D GND
VIDEO OUT
30K30K
4.7K
22
TP521
TP353
CN2
R358
C352
100
R352
10u16
FR
270
+
TP51
1
D-OUT
R65 4.7K
R51 2.2K
TP52
CD DISC12 SW
TP501
TP502
R504C502
470
20
7
4.0V
TP151
∗
10
0..22
D502
23
SDA
CDL
∗
∗
J5
R502
R207
19
8
∗
D524
D525
24
SCL
RH-
R206
R506
C504
R209
470
9
1K
R503
180K180K
4.7
22u10
D503
4.7K
D203
4.9V
0V
AFS
4.0V
C204 0.01
+
TP503
10
R505
0..22
C503
D501
18
SMUTE
AM
10
C203
0.022
R201 10K
∗
PARK SW
VIDEO OUT
TP529
TP532
∗
W114
TP531
∗
W113
5
6
∗
W111
TP530
ELECTRONIC
VOLUME &
FM MPX DETECTOR
IC2
D205
∗
1K
R211
∗
8
6
10
D162
470
R153
1K
100
R171
R174
TP158
TP159
89
L-CE
L-CLK
L-DATAL
TP528
TP527
ACOUTL
VREF
1
4.0V
C209
R162 100K
ACOUTR
2
4.0V
2.2u50
62
R180
TP157
4.1V
262728
CREF
1K
7
FL
4.1V
LFOUT
+
C201
5
R182
L-RST
G
R
RL
FR
4.1V
LROUT
RFOUT
CASSL
3
4.0V
0.47u50
60
∗
D157
∗
D158
1K
RST
4.1V
232425
+
TP156
RR
RROUT
D201
∗
L10
56
TP526
4.7uH
47u10
+
C210
8.1V
22
VDD
C202
11
TP154
LED+B
TP525
C211
0.01
CASSR
4
4.0V
0.47u50
∗
Q151
∗
LED+B
0V
21
+
∗
10K
D156
TP153
ILL GND
TP524
GND
D202
47K
R210
SCL
SDA
5V
0V
CDR
5
4.0V
5
R181 10
TP152
234
PANE 5V
4.7K
R208
CDGND
6
0V
6
W39
∗
1
D GND
0V
X3
0V
TP539
0.01
C506
1
2.2K
5V
0V
TP652
0.01
C114
TP540
IC10
1
Y1
2
Y0
3
Z1
ZCOM
5
Z0
6
INH
7
VEE
8
VSS
0.1
C507
C111
1000P
Q101
4.7K
R114
2.2K
C112
10P
C113
10P
4.332MHz
C115
10u16
TP541
SELECTOR
4.0V
63
4.7uH
+
8.1V
4V
0V
TP653
L9
4V
0V
VDD
YCOM
XCOM
Q501
16
15
0V
14
4.0V
4V
134
0V
X1
12
X0
11
A
10
5.1V
B
9
0V
C
R501
1K
R508
47K
47K
SW
47K
TP533
TP534
TP537
TP535
TP538
TP536
4V
2
J4
0V
4V
0V
ANT.
∗
A1
RF GND
FM ANT
AM ANT
OSC GND
AM+B
OSC GND
OSC GND
3
4
OSC GND
IFC OUT
DIG GND
VDD 5V
NOISE OUT
RDS OUT
AUDIO OUT
AMIF OUT
S-METER
IF1 GND
∗
B
330P
C116
W/N
PLL+B
SDA
SCL
IF1+B
5
C117
4.9V
L3
0.052uH
1
2
3
TP102
4
5
TP104
NC
6
7
8
9
10
11
V1
12
13
14
15
16
17
18
19
20
21
22
23
24
115
2
3
2.4V
+
2.2u50
4
5
6
7
8
TP654
0V
C104
TP113
TP114
TP115
C106
TP120
TP122
C108
R111
5V
0V
IC7
QUAL
RDDA
VREF
2.4V
MPX
OSEL
GND
ARI
FILOUT
0.01
0.01
0.01
4.7K
L6
4.7uH
L7
4.7uH
L8
4.7uH
TP651
4.9V
0V
OSCOUT
EXTRES
C105
0.01
R101
1K
R102
470
R104
470
R105
FM/AM
TUNER
R112
2.2K
R113
2.2K
RDCL
T57
OSCIN
VCC
FSEL
21
20
19
4.7K
4.7K
R103
R106
14
13
TP100TP650
16
14
13
4.9V
12
11
10
TM
9
RDS DEMODULATOR
WIRED REMO
6
REMO.CONT
∗
REMO CONT
∗
MARIN REMO
CN4
CN3
∗
R374
2.2M
R161
1K
1
2
TP371
R176
TP165
1
2
P1
ESD-GND
1K
TP164
TDF DET
D159
∗
R172
∗
47
131415
PON 5
D151
∗
TP163
9
65
470
470
2.2K
R152R173
R160
R154
1K
470
470
R175
R183
∗
TP162
TP161
TP160
10
1112
REMO
L-DATAS
to SWITCH UNIT (X16- ) (J1)
7
X25-9980-11/12/21 (1/3)
13
F G H I J
0V
5V
V
V
D
T
T
T
T
A2
PHONE
TP12
KDC-225/225MR/2025
100
R35210u16
2
+
FR
1
J3
270
TP51
R65 4.7K
D-OUT
∗
GND
R272
R273
470K
0V
2
PGND2
TAB
1
IC4
0V
AUDIO
POWER
IC
47
R66 4.7K
R51 2.2K
R52 2.2K
TP53
TP52
2
(SW2)
CD DISC12 SW
H
TP303
C356
0.1
10K
Q252
R271
100
52
SCL
TP55
TP54
4
3
(SW1)
CD-SCL
CD LOS SW
7
Rch
TP306
R302
+
C302
G
R
RR
C254
0.22u50
10
12
IN2
SVR
OUT1+
9
D252
FR+
48
R62 100K
CD MUTE R
9
10
11
12
TP308
10
0.47
D310
C251C252
0.22u50
14
11
0.22u50
53
R54 1K
TP61
11
CD MUTE L
LX-BUS
13
Lch
TP312
10
R301
0.47
C301
FL
4.3K
R253
1u50
C257
IN4
6.7V
IN1
SGND
13
0V
FR
50
1K
R551KR56
TP62
12
CD RST
R307
16
C253
RST
4.7K
26
D309
15
R254
10
+
ACGND
IN3
15
0.22u50
RL
55
TP63
CD MSTOP
DATA M
TP307
100
R310
17
D307
0V
14.4V
PGND3
OUT3+
17
D255
RL+
51
R57
2.2K
R64 4.7K
∗
∗
TP64
14
(SW4)
CD DISC8 SW
CLK
TP311
TP313
100
R311
R309
18
D308
R312 100K
32
22K
R256
D270
221820
VCC2
MUTE
OUT3-
19
D257
RL-
56
R58 2.2K
TP65
(SW3)
CD LOE LIM SW
DATA S
4.7K
16
R313
220
R255
D269
OUT4+
D251
FL+
R63 2.2K
TP66
161518
J2
15
236
48
B.U.
CON
TP301
TP302
R304
4.7K
27
TP304
R306
C303
A GND
4.7
47u10
D301
R303
REQ M
100
29
D311
31
0V
14.4V
R252
47K
C256C255
33u10
1u50
++ +
648
VCC1
STBY
PGND1
6.7V 6.7V
OUT1-
OUT2-
OUT2+
3
5
7
D256
D258
D254
FR-
RR-
RR+
R53 1K
R61 100K
TP57
TP58
TP59
TP60
8
7
Lch
10
913
Rch
GND
4.9V
0V
5
33K
R251
SDA
TP56
6
CD-SDA
AUDIO+B
to CD MECHANISM ASSY
TP310
4.7K
R305
100K
TH1
D271
4.4V
0V
OUT4-
232125
FL-
17
BU5V
MUTE
28
R315
D253
TP67
DGND
TP305
R257
4.3K
C258
1u50
HSD
DGND
R308
100K
REQ S
TP309
4.7K
64
100K
R314
0V
24
PGND4
57
100
R59
R60
TP72
TP71
TP69
22
20 24
21
19
D4.5V
D4.5V
CD LOEJ
DC IN
J1
9
8
REAR L+
FRONT L-
FRONT L+
TP1
TP2
TP3
TP4
FL-
FL+
RL+
SERVO
Q21
C21
47u16
Q24
D21
C19 R21
0.47 1.5K
R44 47K
R43
C45
0.22
CD
MECHA +B
C43
220u16
46
R41
47K
47K
R42
2.3V
0V
+
R33
47K
47K
R32 22K
Q41
5.0V
R31 10K
C31 0.01
LINE
MUTE
513
ON/OFF
4
∗
0V
VOS
L12
220uH
D31
GND
A
14.4V
C41
VIN
SWOUT
2
SW14
Q22
+
D41
64
21
5V
0V
21
TUN IFC OUT
22
22
RDS AFS
23
23
SDA
24
24
SCL
25
NC
26
26
27
28
29
TP602
31
32
TP603
34
R430 47K
46
38
R431 47K
TP604
TP605
35
36
37
39
40
58
2.2K
TP74
TP73
23
SERVO+B
CD MOTOR
SERVOGND
LX RST
27
LX CON
28
LX MUTE
29
LX REQ M
30
PWIC SVR
31
PWIC STBY
32
PWIC MUTE
0V
33
VSS1
34
ACC DET
35
RESET2
36
MUTE
37
BU DET
38
PARK SW
39
PS2 1
40
PS2 0
5V
0V
20
TUN SDA
5V
0V
19
TUN SCL
4.9V
0V
4.9V
0V
PS1 0
41
41
5V
0V
42
4.9V
0V
LX CLK
5V
0V
4.9V
0V
4.9V
0V
5V
0V
PS1 1
42
161718
1720181915
16
LX DATA S
LX DATA M
PS1 2
PON 5
454443
43
44
100u25
IC9
TP601
5V
0V
3.5V
0V
NC
Q2
R6
BU DET
C42
+
100u25
+
12.8V
0V
∗
C
2
15
PWIC BEEP
5V
0V
4.9V
0V
5V
0V
PON CD
10K
TP600
14
RDS DATA
CD DISC12 SW
484746
47
R5
10K R4
20K
D5
C3
1000P
Q1
R3
SERGE
DET
11
13
10
121314
L CLK
AUX ON
TDF DET
RDS QUAL
4.9V
0V
5V
0V
∗
IC1
SYSTEM
MICROPROCESSOR
5V
0V
NC
CD MUTE R
48
CD MRST51NC
49
50
TP606
TP607
50
CD LOS SW
CD DISC8 SW
52
51
TP608
52
REAR L-
FRONT R-
TP5
RL-
FR-
D3
R1
68K
D2
R2
39K
100K
R7
100K
5.0V
IC6
MUTE
DRIVE
9
856
9101178
L DATAL
L DATAS
5V
0V
5V
0V
5V
0V
4.5V
0V
5V
0V
CD MUTE L
CD MSTOP
555453
TP609
535556
1210 11 13 14
REAR R-
FRONT R+
TP8
TP6
TP7
RR-
FR+
C5
R11
22K
4.7
R432
13
14
VCC
5V
0V
Y1
1
2
5V
0V
0V
6
45123
L CE
L RST
AVREF1
CD MOTOR
CD LOEJ
CD LOE LIM SW
58
57
P-ANT
REAR R+
TP9
RR+
ACC DET
Q3
0.01
34
35
12
11
Y4
A4
B4
A1
Y2
B1
3
4
0.6-4.1V
0-1.4V
AVSS
LINE MUTE
RDS NOISE
5V
0V
5V
0V
0V or 5.0V
5V
0V
RESET
DSI
6059585756
60
P-CON
TP11
D4
C4
10K
R10
10
Y3
4.9V
0V
5V
0V
63
1
0-5.0V
TUN
TUN
TUN SMETER
5V
0V
LX
5V
0V
4.9V
0V
35467
0.01
5
0
5
R
KE
X25-9980-11/12/21 (2/3)
14
3
60
LINE
MUTE
B1
B4
13 14
P-ANT
TP9
C DET
R10
34
35
10
11
A4
Y2
4
0-1.4V
0-5.0V
1
2
RDS NOISE
5V
0V
0V or 5.0V
5V
0V
RESET
60
FUSE
1615
F1 10A
2134
ACC
GND
P-CON
TP11
D4
C4
0.01
10K
5V
0V
Y3
5V
0V
4.9V
0V
5
5V
0V
63
1
TUN TYPE1
TUN TYPE0
TUN SMETER
TYPE 0
TYPE 1
TYPE 2
5V
0V
LX REQ S
RDS CLK
KEY REQ
4.9V
0V
TP10
PHONE
∗
C1
+
TP15
TP12
TP13
W239
∗
R9
33K
R8
3.3K
1/2W
C6
37
8
A3
GND
7
R419
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
X1
10.000MHz
0.01
+
C409
47u6.3
22K
R415
TP610
5.0V
32.768kHz
R420
10K 22P
W29
0V
5.0V
0V
5V
0V
36
B3
A2
B2
69
0V
AVDD
VDD0
XT1
XT2
TEST
X1
X2
VDD1
VSS0
NC
REMO
NC
B.U.
TP14
L1
D1
L2
27uH
∗
TP20
C33
∗
0.01
C410
22K
TP611TP612
0V or 5.0V
∗
R411 22K
∗
R412 22K
∗
R416 22K
∗
R417 22K
∗
R421 22K
∗
R422 22K
X2
65
62
5V
0V
0.01
C407
22P
C408
140uH
Q4
C406
TP16
0.22
R22
R23
∗
PON 5
R12
4.7K
4.7K
47K
D23 D22
∗
R13
5.6K
L11
4.7uH
RESET
IC
5.0V
TP401
D24
∗
D25
R410
47K
2
VDD
4.9V
NC
3
∗
D
TP21
TP22
W34
∗
TP23
C29
10u16
+
C24
10u16
+
C25
10u16
+
∗
C20
100u16
+
C26
10u25
+
C28
220u16
+
∗
C30
100u16
+
∗
Q23
*R24 1K
43
44
D401
1
IC8
VOUT
0V
VSS
4
DSI
D402
R407
Q401
240
R425
1K
KDC-225 (1/2)
C22
C23
∗
TP30
10
TP31
11
TP32
FRONT L
IC3
0V
1
GND
2
PCON
++
14.1V
10u25 10u25
3
PANT
14.0V
TP24
4
FM
8.1V
TP25
5
AM
7.9V
TP26
6
AUDIO
8.1V
TP27
7
VCC
14.3V
TP28
8
VDD
5.0V
TP29
9
VBU
13.2V
C27
9.9V
4.5V
2.0V
0V
10
SW1
4.9V
2.4V
0V
11
SW2
10.3V
12
ILM
+
POWER
SUPPLY IC
10u50
∗
D526
D26
C32 0.01
10
11
R28 1K
R27 1K
R26 1K
R25 1K
41
42
40
39
:
IC1
∗
:
IC2 D2-4,309,310,501,502
E-TDA7407D
:
BA4911-V4
IC3
:
E-TDA7560
IC4
:
SN74HC02NSR
IC6
:
E-TDA7479AD
IC7
:
PST3436UL-E
IC8
:
SI-8050JF3NF
IC9
:
CD4053BNSR
IC10
(X25-998x-xx)
MODEL NAME C1
KDC-MP225
KDC-MP4026
KDC-W4026G
KDC-W4527/G
KDC-W4527Y/GY
RX-492WMP
KDC-MP4026V
KDC-225/2025
KDC-W427Y
KDC-225MR
UNIT
No.
0-10
0-21
2-71
0-01
0-22
0-11
2-72
0-12
IC1
78422GC231A
78422GC231A
78422GC231A
78422GC231A
78422GC232A
78422GC233A
78422GC231A
78422GC233A
UNIT
No.
0-10
NONONO
0-21
YES
2-71
YES
0-01
NO
0-22
YES
0-11
YES
2-72 YESNO YES
0-12
NO
J5NOL2
E58-0992
E58-0992
E58-0992
E58-0993
E58-0992
E58-0992
E58-0992
E58-0992
FRONT R
ANT CONT
P. CON
ACC
GND 161
ANT CONT
P. CONT
ACC
P CONT
ANT CONT
A
P.CON
B
Q1-3,41,401
:
2SC4081
Q4
:
2SA1036K
Q21
:
2SB1565(E,F)
Q22,23
:
UMC2N
Q24
:
2SD1858
Q101,201,351,352
:
DTC143TUA
:
Q151
DTA114YUA
:
Q252
2SA1576A
:
DTA124EUA
Q350
:
DTC144EUA
Q501
:
DTA144EUA
Q521
ACB
YES
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
YES
YES
NO
NO
YES
NO
NO
YES NO
NO
Q23
Q151
NO
YES NO
YES
NO
YES
NO
NO
YES
YES
NO
YES
NO
YESNOYES
NO
YES
YES
NO
NO
YES
NO
YES
YESNONO
WHT
WHT/BLK
GRY/BLK
GRY
BLU/WHT
RED
DC CORD
(E30-6027) : RX-492WMP
WHT
WHT/BLK
GRY/BLK
GRY
BLU/WHT
RED
DC CORD
(E30-6322/E30-6323)
KDC-W427Y/MP225
KDC-225/2025/225MR
KDC-MP4026/G/V
WHT
FL+
WHT/BLK
FL-
GRY/BLK
FR-
GRY
FR+
BLU/WHT
BLU/WHT
RED
B.U
2
341
314257
FR-
RR-
FR+
RR+
FEDGH
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
YES
R24,
R57,
R23
411
64
NO
NO
YES
YES
NO
YES
NONOYES
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
GRN
89
GRN/BLK
10117
VIOL/BLK
6
VIOL
12135
BLU
4
BRN
14153
2
BLK
YEL
GRN
9108
GRN/BLK
7
VIOL/BLK
11126
VIOL
5
BLU
134
143
152
YEL
BLK
161
GRN
9
8
GRN/BLK
10
7
VIOL/BLK
11
6
VIOL
12
5
13
4
BRN
14
3
15
2
BLK
YEL
16
1
GND
8
ACC
567
68
DC CORD
(E30-6286/E30-6132)
FL-
RL-
FL+
RL+
KDC-W4527/Y/G/GY
:
D1
D5,269-271
D21
D22,25,251,253,255-258
D23,24,252,254
D26,203,401,521
D31
D41 SFPB-54VNF
X86-3760-11
X86-3760-11
X86-3762-70
X86-3760-01
X86-3760-11
X86-3760-11
X86-3762-70
X86-3760-11
R172,
:
:
:
:
:
:
:
:
A1
2200u16
2200u16
2200u16
2200u16
3300u16 220u16
2200u16
3300u16
R211
R206
183
YES
NO
YES
YESNONO
YES
YES
NONOYES
YES
NO
NO
NO
YES
NO
S2V60
MAZ4068N-M
1SS133
MAZ4082N-L
D1F60-5063
AM01ZNF
DAN202U
MAZ4047-M
R374
YES
NO
NO
YES
NO
NO
NO
YES
NO
ONMLK
KDC-225/225MR/2025
REAR L
REAR R
TEL MUTE
BU
BATT
CAUTION : For continued safety,
replace safety critical compo-
RL+
RLRRRR+
TEL MUTE
A
∗
C20
C23 C33
NO
NO
YES
NO
NO
YES
YES
NO
YES
NO
YES
R412
YES NO
NO
YESNOYES
NO
NO
NONONO
NO
YES
NO
YES
YESNONO
NO
NO
NO
NO NO
nents 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.
D151,157-159,162,301,
307,308,311,503,522,523
:
MAZ4062-L
:
D156
D201,202
D205
D402
D524-526
C30
100u16
100u16
100u16
100u16
100u16
100u16
220u16NOYES
R416
R417
YES
NO
YES
YES
NO
YES
YES
NO
YES
YES
MAZ4120-L
:
EDZ6..2B
:
1SS400
:
B30-1567-05
:
DA204U
SIGNAL LINE
GND LINE
B LINE
D23,
D151,
25
NO
YESNO
YES
YES
YES
NO
YES
W34
NO NO
YESNONO
NONONO
NONONO
YES
W39
NO
YES
NO
NO
159
YES
YES
YES
NO
YES
YES
NO
YES
D156-
158
YES
YES
YES
NO
YES
YES
YES
YES
W111,
113,114
YES
YES
YES
YES
NO
YES
NONOYES
YES
CN4
CN3
NO
YES
NO
NO2200u16
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
NONO
NO
NO
NO
NO
R422
R421
YES
NO
YES
YES
NONONO
YES
NONOYES
YESNO
NO
YES
NO
YES
X25-9980-11/12/21 (3/3)
D201,
202
NO
NO
NO
NO
YES
YES
NO
YES
W239
YES
YES
YES
YES
YES
NO
D205,
524-526
NO
NO
NO
NO
YES
NO
NO
NO
15
1
2
3
4
5
6
7
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