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A
B
1
1
REQ H
7
RST
∗
13
11
12
8
4
3
2
2
GND
8
Rch
C
3
B.U
9
REQ C
9
10
6
7
5
1
4
CH-CON
10
DATA C
5
MUTE
11
DATA H
6 A. GND
12
Lch
13
CLK
REAR
J5
2
R227
R228
30K
30K
D404
Q223
Q224
Q223,224
PRE OUT
MUTE
Q40
3
BU5V
5.0V
MUTE GATE
PRE OUT
MUTE
DRIVER
IC8
4
SW5V
∗
Q201
R204
E
Q201
NOISE
1K
BUFFER
R205
4.7K
RDS DECODER
IC6
R351
R353
2.2K
5V
2.2K
1
16
15
QUAL
RDCL
0V
R352
2.2K
5V
2
15
14
RDDA
0V
T57
C351
14
C356
10u6.3
3
OSCO
2.4V
VREF
10P
+
5
C352 330P
4
13
C355
MPX
OSCI
5
12
10P
OSEL
5.0V
VCC
6
11
GND
EXTRES
0V
7
10
ARI
TM
8
9
FI 1 OUT
F SEL
C228 0.01
SW5V
6
Q102
47K
PANEL
5V SW
10K
ILL+B
15
13
11
9
7
5
3
1
14
12
10
8
6
4
2
J3
7
C
D
(X25-91XX-XX)
+B
J4
1
5
9
2
6
10
13
3
7
11
∗
D268
∗
4
8
12
D264
∗
D266
∗
D262
+B
BU5V
SW5V
+5V
5.0V
R123
60
1K
0V
IC11
CP3
CP2
1K
2.2K
RESET
0V
R127
18
2.2K
61
61
REMO
5V
5V
0V
0V
17
5V
62
R-CLK
5V
0V
0V
5V
63
0V
63
CH-REQC
∗
5V
R414
0V
100K
5V
R129
64
64
LO/S SW
0V
5V
2.2K
65
KEY
KEY-REQ
0V
R130
66
66
12EJE SW
2.2K
67
VSS 0
0V
5V
5.0V
68
0V
+5V
VDD 1
C104
R131
69
X2
15P
6.8K
X1
∗
C105
4.19MHz
70
X1
15P
71
SYSTEM
IC
0V
u-COM
72
XT2
73
5.0V
+5V
XT1
74
VDD 0
5V
75
0V
AVREF0
76
S-METER
0-4.0V
77
PHONE
0.6-4.1V
R134
78
2.2-4.5V
NOISE
5V
5V
2.2K
79
0V
N.C
0V
80
5V
AV CONT
0V
5V
0V
5V
0V
+5V
+5V
E
F
+B
3.4V or 4.1V
∗
D267
∗
POWER
D261
∗
∗
IC4
D263
∗
D265
C255
∗
1u50
R260
∗
C258
41
750
1u50
R261
+
R256
∗
+
1K
W178
Q251
D251
10K
40
47K
Q251
POWER IC
SVR SW
38
BU5V
77
43
+5V
E2P ROM
5.0V
IC12
CP1
10K
1
8
VCC
2
7
WP
3
R264
0V
6
47K
4
SCL
VSS
5
SDA
5.0V
0V
5.0V
5V
40
0V
0V
SVR
0V or 5.0V
5V
or 0V
FL
39
0V
P-MUTE
FR
38
R119 47K
MUTE
5V
RL
0V
37
R117 1K
R118 10K
CLK
RR
5V
R115 1K
R116 10K
36
0V
DATA
8.2V
R114 47K
35
IC2 TYPE0
34
R113 47K
IC2 TYPE1
33
0V
VSS 1
IC1
32
SDA
0V or 5.0V
TYPE0
∗
∗
R139
R140
SCL
47K
47K
31
0V or 5.0V
∗
∗
TYPE1
18
R137
R138
30
47K
47K
0V or 5.0V
∗
∗
TYPE2
R135
R136
29
5.0V
TYPE REF
17
28
47K
47K
CH-CON
5V
R110
27
0V
SD
27
26
4.7K
N.C
25
5V
5V
N.C
0V
5V
0V
24
N.C
0V
23
5V
N.C
0V
5.0V
22
5V
0V
LO/DX
22
0V
R58
21
AFS
21
4.7K
28
ILL+B
G
H
J2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
SURGE
DETECT
Q70 D70
+B
+B
ACC DETECT
TEL
MUTE
Q20
R21
D20
33K
R10
30K
Q10
BU DETECT
43
AUDIO+B
TH1
BU5V
SW5V
BU5V
+5V
Q101
R101
D102
240
DSI SW
L201
4.7uH
AUDIO+B
IC2
(BOTTOM VIEW)
ILL+B
28
1
C203
AC OUT L
VREF
2.2u50
27
2
4.1V
AC OUT R
CREF
+
C205
3
2.2u50
26
4.0V
L
3
OUT FL
4.1V
+
25
OUT FR
D202
24
OUT RL
C204
23
OUT RR
4
2.2u50
R
4
+
D201
5
22
CDR
5
VDD
6
CD GND
6
7
CDL
7
0V
21
8
∗
GND
PH-
W21
9
AFS
C206
R201
10
0.015
2.7K
AM
AM
20
SDA
C210 0.033
5.0V
19
SCL
0V
R202
C207
4.7K
11
18
S MUTE
3.5V
MPX
FM
0.47
C211 150P
AUDIO+B
C209
12
LEVEL
17
0.1
QUAL
0V
16
13
4.7V
OUT R
MP IN
15
14
1.0V
OUT L
MP OUT
E.VOL & N.C MPX
ILL+B
R141
R144
4.7K
100K
R143
4.7K
1
3
5
7
9
11
13
2
4
6
8
10
12
P1
CN1
to CD MECHANISM
I
J
FUSE
AM+B
FM+B
R71
+B
POWER
82K
SUPPLY
IC7
0V
1
GND
D13
14.0V
2
P-CON
D11
D10
14.0V
3
P-ANT
C52
10u16
8.1V
4
FM +B
+
C53
10u16
7.9V
5
AM +B
+
8.1V
6
AUDIO+B
AUDIO +B
BU5V
L2
14.3V
7
C54
VCC
10u16
C55
C58
SW5V
+
10u25
100u16
Q50
+
+
8
BU5V
BU 5V
C57 220u16
9
C101
V BU
5.0V
+
100u6.3
+
5 7
C102 0.01
3
VDD
D50
1
10
47
SW 1
42
11
52
SW 2
4
C56
3
VDD
10u50
1
+
10.3V
12
ILLUM
Q51
L303 4.7uH
FM+B
L304 4.7uH
SW14V
AM+B
D51
J1
Q55
L4
52mH
SERVO
+B AVR
F/E
+B
∗
A1
C302
0.01
1
RF GND
C301
100u10
2
FM ANT
+
3
AM ANT
4
FM +B
5
AM +B
6
AM LO/DX
7
22
FM LO/DX
8
IF SELECT
9
4
RDS OUT
10
REQUEST
∗
W179
11
∗
K2I-VTH
W143
12
VCO GND
13
27
FM SD OUT
14
76
FSD OUT
15
FM
FM DET OUT
16
AM
AM DET OUT
L305
R301
17
AUDIO+B
COMMON +B
2.2
4.7uH
18
IF GND
19
HI UP ADJ
20
20
PLL CE
21
9
PLL DATA
22
10
PLL CLK
L306
23
SW5V
P-ON 5V
4.7uH
24
DIG GND
R145
2.2K
C309
0.01
15
17
19
21
14
16
18
20
22
KDC-4021/V/Y/YV (1/2)
KDC-3020R (1/2)
KDC-3021A/G/YA/YG (1/2)
KDC-306A/G/YA/YG (1/2)
KDC-2092RYA/RYG (1/2)
KDC-2021SA/SG (1/2)
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