Kenwood KDC-348U Service Manual page 30

K
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
V
Q92,93
4V PRE OUT
+B AVR
Q92
Q93,94
C93
Q93
CONT
1000P R95
SW
1K
Q91 for 4V
PRE OUT
+B
R97 R94
Q94
100
TP103
2.2
81
17
16
D401
80
D402
79
32
ACOUTR
31 D403
ACOUTL
30
MUTE2
3.3V
29
78
0V MUTE1
28
MUTE0 ∗
L403 ∗
C416
10P
3.3V
∗
VR413 C419
27 +
REF3V3
0 C410 47P
C408
2.2u50
1
26
VOLINR 12
C407
25
VOLINL 11
24
1
REF5V5
17
23
SAIN
22
SAOUT
3.3V
21
0V SARES 76
20
SACLK 77
19
SCL
18
3.3V
SDA
17 R402
SEL
10K
R401 R403
132
10K 4.7K
SCL
TP414
SDA 18
16
4 5 6 7 8
BU5V
20
C311
0V
4P
3.3V
0V
IC301
3.3V
to 5V
R302
100
0 8 6 4 2
9 7 5 3 1
30
X34-696x-xx (3/6)
L
1 2 3
21
SWREG5V
A8V
17
∗
B
18
17
W106
BU
18
21
112
17
17
16
8 18
16
8
7
7
8
18
19
16
18
7
8
SW3.3V
BU3.3V
4 5 6 7 8
4
5
BU5V 6
SERVO+B
R315
10
18
20
4
5
5.0V 6
SW3.3V
5V
0V
20 20
5 6
M
1 2 3
1 2
BU3.3V
1
2
R203
22K
∗
I
WIRED
REMO
∗
R242
3.3V
0V
0
109
R519
LX REQ S
220
110
SDA TUN SDA
R520
111
SCL TUN SCL
8
220
112
REMO
WIRED REMO
113
REMO
PAN PAN REQ
3.3V 114
REGVCC3
C212 C203
115
XT1
0.1 22P
X202
32.768kHz
C202 R204
116
XT2
22P 100K
3.3V 117
CVCC3
C213 C217
118
X1
0.1 8P
X201
0V 119
C218 R205
CVSS
8P 1K
120
X2
3.3V 121
DVCC3
C214
0V 122
DVSS / REGVSS
0.1 R209 15K
123
USB D+
124
R208 10
USB D-
D+
125
NM IN
R206 10
126
D-
TEST1
R207 15K 127
TEST2
128
NC
C215
129
NC
0.1
3.3V 130
AVCC3
∗
R462 131
19 131 SA IN
12K
132
132 AUD DC ERR
∗
R463
133
NC
47K
134
LINE MUTE
135
NC
136
NC
137
∗ NC
R212 47K
0V or 0.8V or 1.6V
138
NC or 2.4V or 3.3V
∗
R213 47K
139
TYPE1
∗
R215
140
TYPE2
141
∗
R214
NC
TP211
142
R216
NC
100K 0V 143
SERIAL DET
∗ 144
IC203
NC
1 8 3.3V
A0 VCC
2 7 0V
A1 WP
3 6
A2 SCL
4 5
VSS SDA
0V
E2PROM
3.3V
0V
18
BU3.3V
N
3
21
22
17
18
BU3.3V
18
3.3V
0V
3.3V 3.3V
0V 0V
3.3V
3.3V
0V
0V
3.3V
0V
3.3V
0V
0V or 1.2V or 3.3V
ENTRY STEPUP
3.3V
0V 3.3V 3.3V
0V 0V
3.3V
0V
3.3V
0V
4
SW3.3V
20
5
5 6 6
O
3
2
17
BU3.3V
1
∗
R620
∗
C211 R617
68K
0.1 100K
∗
R616
47K
3.3V
0V
∗
IC201
SYSTEM u-COM
3.3V
0V
3.3V
0V
4
20