Kenwood KDC-348U Service Manual page 31

P
3
21
22
17
BU3.3V
17
23
∗
R620
68K
∗
R616
47K
3.3V
0V
3.3V
3.3V
0V
0V
3.3V
0V
0V or 3.3V
3.3V
0V
CD DRIVE MUTE
3.3V
0V
.3V 3.3V
V 3.3V 0V
0V
20
4
6
Q
21
22
BU3.3V
23
3.3V
23
0V
73
24
3.3V
0V
3.3V
0V
72
BU DET 72
71 23
ILLUMI DET 71
70
3.3V
NC
0V
69
NC
3.3V
68
∗
R954
0V NC
100
67
SD CLK 67
∗
CP901 100
BT BT DATA
66
SD DI 66
24
65
BT SYS DATA 65
SD DO
64
PON SW-REG 64
63
NC
25
62
FSEL1 62
61
NC 26
60
PS2-1 60
59
PS1-3 59
58
PS1-2 58
57
PS1-1 57
56
NC
55
NC
54
NC
53
BT RST
53
SD CS
3.3V
0V 52
SD PWR 52
51
SD CD 51 25
50
NC
TP55
49
NC TP56
48 0V
DVSS
25
47 3.3V
DVCC3
46
C210
NC
45
0.1
CD MOTOR 45
R234 1K
44
44
R233 100
43
CD CCE 43
R232 1K
42
CD RST 42
R230
R231
41
ZDET IN 41 22K
40
100
CD DISC12 SW 40
39
BEEP
3.3V
R229 100
38
0V CD CLK 38
R227
R228
37
CD SI 37 22K
100
3.3V
0V
20
3.3V
0V
3.3V
0V
20
SW3.3V SW
∗
Q302
20
BU3.3V
SW3.3V
6
R
3
POWER IC
0V
21 3
22
3.3V
0V
R807 R821
1K 0
C807
1
R802
47K
IC802
3.3V
0V
1
VCC
5V
2
0V
3
4
GND
3.3V
0V
to 5V
23
21 3
22
3
21
24
BU3.3V
IC21
BU3.3V
3.3V
4 3 5.0V
NC
CE
2
0V
TP53
GND
5.0V
5 1
VOUT VDD
3.3V AVR IC
25
6
22
BU
6
R57
64
1K
SW REG
22
C58
4.7
0V 5
R54
0.25V 6
14.4V 7
82K
8
Q51
62
FREQ CONT
SW for IC51
22 104
USB+5V
IC71
3.3V
0V
4
5.1V
5
USB5V
6
∗
R11
FL+B
7.5
1/2W
SWREG5V
3.3V
TP908
SW3.3V
S
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
BU
7.1V
5V
5V
0V
0V
5V
0V
5.0V
8
7
6
5 R822
100
3.3V
0V
3
23 23
SWREG5V
3
21
24
BU3.3V
26
BT LPF
0V
IC901
4.0V 5 4
V-
6 3
2
4.0V
7
R907
2.2
8 1
V+
8.1V
TP900
AM+B
BU5V
25
6
BU
TP54
3.3V
R51
0V
30K
IC51
R52
160K
4 0.7V
FB
GND
C53 R53
3 0.9V
FREQ COMP
2
150P 160K
VIN EN
L51
1
BST SW
22uH
C54 R59
0.1 D51 15
C52 10
TP52
C55
1000P
3.3V
0V
R71
3 22K
OC
EN
2 0V
GND
5.1V
1
VOUT VIN
HI SIDE SW
SWREG5V
3.3V AVR
∗
IC902 5.0V
OUT IN
GND
0V
SW3.3V
X34-696x-xx (4/6)
T
TP315
0V
3.3V
C808
0V
1
27
27
26
∗
A
TP901
BUFFER
R905 C905
5
22K 0.1
R906 C906
7
22K 0.1
fc = 25kHz
28
C
SWREG5V
6 25
53
SW3.3V
R955
52
1K
SD3.3V
Q951
∗
SW
L
R915
∗
M
C908 0
10u35 R9
0
∗
C909
6 25
0.1
67
MIC-N
MIC-P
∗
R951 100
51
∗ ∗
R902 R914
65
47K 47K
∗
R953
66
47K
1 2 3 4 5 6 7
∗
CN901
BLUETOOTH
MODULE / SD SLOT
31