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K
KDC-BT40U/BT645U
KDC-U546BT
3
18
R58
47K
C69
0.1
5V
75
0V
AUD SDA
5V
74
0V
ACC DET
73
BU DET
72
NC(PS2 2)
71
PS2 1
71
70
PS1 3
70
0 or 5.0V
69
PS1 2
69
68
PS1 1
68
5V
67
PON FL
0V
66
BT RST
65
NC
64
NC
63
NC
62
0V
VSS
9B3
9B1
61
NC
4.1V
5V
5.0V
60
0V
0V
VCC2
B3
9B1
59
CD LOE LIM SW
V
5V
R275
V
0V
58
SOC S STOP
/PON CD
100
5V
57
0V
CD LOEJ
5V
56
0V
CD MOTOR
∗
V
R274
55
V
CD DRIVEMUTE/NC
100
CP202
5V
100
0V
S SYS REQ
54
5V
/CD CCE
5V
0V
53
0V
SOC RST
/CD MRST
B1
5V
R268
52
0V
SOC MUTE
5V
470
/CD MUTE
0V
51
CD DISC12 SW
5V
0V
2
3
BU5V
14
14
15
Q902
LEVEL SHIFT
(5V
3.3V)
R918
47K
R278
34
100
14
33
2
1
2
CN900
3
1
26
X34-662x-xx (3/4)
L
1 2
1
2
18
22
17
FL,FR
23
17
MUTE
1
CONT
SCL
22
3
18
SDA
3.3V
0V
74
73
FL-
FL+
19
RL-
10
19
1
RL+
C801
12
RL
0.22
0V
14
C803
16
RR
22
0.22
59
18
RR+
58
20
57
RR-
56
22
55
FR+
13
24
17
FR-
R810
54
1K
26
83
53
5V
0V
52
87
R905
10K
BUFFER
4.3V
5
LPF
6
13
4.3V
7
R903
8.6V
8
2.2
MONO
19
15
10
20
∗
C912
10u35
10
+
C918
C913
C916
1000P
0.1
330u6.3
C922 0.1
R919
+
47K
3
4 5 6 7 8 9
10 11 12 13 14
BLUETOOTH MODULE
M
SW5V
22
1
Q105
MUTE
Q104
MUTE
1
CONT
90
R803
17
89
47K
POWER IC
IC6
C807
1
TAB
2
0V
1
OFFDET
3
PWRGND1
4
5V
OUT2-
0V
5
6
STBY
OUT2+
7.2V
7
14.4V
VCC1
8
OUT1-
9
0V
PWRGND2
R812
C805
OUT1+
7.1V
1
0
33u16
11
SVR
+
C802
IN1
7.0V
0.22
13
IN2
FL
S-GND
C804
15
IN4
FR
0.22
R808
IN3
TP315
10
17
C806
R813
AC-GND
OUT3+
1
4.3K
0V
19
PWRGND3
OUT3-
7.2V
21
14.4V
VCC2
OUT4+
0V
R804
5V
330
23
MUTE
OUT4-
0V
25
PWRGND4
CD
27
TAB
D801
R805
22K
SW5V
R906
10K
0V
C906
TP901
10
IC900
4
R912
C910
V-
3
22K
1
SP+
R913
C911
2
SP-
22K
1
20
1
V+
fc = 25kHz
TP900
C904
0.1
20
19
Q901
BT MODULE
RESET CONTROL
15
20
IC901
19
∗
R936
IC901
D+3.3V
0
AVR IC
∗
L900
180
TP908
A900
IC1
:
IC2
: E-TDA7718N
IC4
: BD49131-V4
IC6
: E-TDA7851A
SIGNAL LINE
IC7
: E-TDA7478AD
IC8
: XC6120N362N-G
GND LINE
IC51 : See parts list.
B LINE
IC52 : BD2224G
IC501 :
IC900 : NJM4565V-ZB
IC901 : SI-3033KMSA
N
J1
9
10
11
8
7
6
18
22
18
BU
SW 14
Q12
Q11
Q11,12
CONTROL SW
for SERVO+B
C17
0.1
Q2,3
Q2
Q3
SERVO+B
D2
AVR
C2
22u16
+
SRV+B
18
SERVO
+7.5V
18
0V
TP54
R53
15K
0.8V
∗
∗
C56
R55
∗
R56
0.5V
∗
R57
Q53
43K
FREQ
CONT
SW for
IC51
∗
B
3.3V
0V
IC52
HI-SIDE
SW
3.3V
0V
15
5
USB5V
AU8V
BU
15
BU5V
SW5V
19
LED+B
Q2
: KTA1046-P
∗
Q3,101-103 : 2SC4081
Q11,13,901 : RT1N241M-T111
Q12,14,707 : RT1P241M-T111
Q53,104,105 : RT1N441M-T111
Q301
: RT1P144M-T111
Q701-706
: RT1N430M-T111
Q902
: UM6K1N
∗
O
DC IN
12
13
5
4
P ANT
∗
C
D103
R102
4.7K
∗
R152
0
21
TP17
C105
R111
R110
0.01
47K
68K
R113
R119
100K
47K
C102
Q102
0.01
SURGE
DET
D109
R115
10K
Q10
LINE
MUTE
BU DET
R117
6.8K
18
SW REG
IC51
5V
0V
6
5
SYNC
RUN
7
4
14.4V
PG
VIN
8
3
FB
1.0V
SW
9
C57
2
VC
BOOST
10
0.47
1
RT
BD
5.1V
USB
+5V
L73
TP52
C3
0.1
5.1V
∗
C4
0.1
C5
220u16
+
CONTROL SW
∗
D5
for IC4
∗
Q14
∗
Q13
19
D1
: S2V60-50
D2
: HZS9-E(A
D3,101-104 : D1F60-50
D4,5,401,801,802
: HSS4148
D51
: CMS14
D106-108
: MTZJ6.8(
D109
: HZS5-E(B
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