![background image](http://html.mh-extra.com/html/kenwood/kdc-bt838u-radio-cd/kdc-bt838u-radio-cd_service-manual_187172038.webp)
38
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
X32-6130-00 (2/2)
AS
AR
AQ
AP
AO
1
2
3
4
5
6
7
CAUTION :
For continued safety, re place safe ty critical com po nents
only with manufacturer’s rec om mend ed parts (refer to parts list).
Indicates safety critical com po nents. To reduce the risk of electric
shock, leakage-cur rent or re sis tance mea sure ments shall be carried
out (ex posed parts are ac cept ably in su lat ed from the supply cir cuit)
be fore the ap pli ance is returned to the customer.
• DC voltages are as measured with a high impedance volt me ter.
Val ues may vary slight ly due to vari a tions between in di vid u al in stru-
ments or/and units.
2.2V
2.1V
2.3V
0V
2.5V
1.9V
3.3V
1.7V
1.7V
88.8kHz
3.2V
1.8V
0V
0V
3.3V
1.3V
3.3V
1.5V
3.5V
1.7V
3.0V
3.3V
1.7V
3.0V
0V
0V
3.3V
0.1V
3.7V
3.3V
0V
0V
0V
0V
3.3V
1.5V
1.5V
1.6V
1.6V
150kHz
0V
0.9V
1.7V
1.7V
1.7V
1.6V
2.4V
2.2V
3.3V
2.5V
0.2V
0V
2.1V
2.0V
2.0V
1.8V
2.1V
1.5V
1.8V
1.4MHz
19.8kHz
87.7kHz
3.2V
16.934MHz
16.934MHz
200Hz
1MHz
10.36kHz
1.45MHz
1.7V
IC4
DPU1
OPTICAL
PICKUP
(X92- )
BD8222EFV
TC94A70FG-010
S-1132B15U5T1G
XC6218S152MR
2SB0970
DTC114YUA
S-1132B33U5T1G
DA204U
DAP202U
IC4
Q13
D3,4
D2
:
:
:
IC11
Q1
IC5
IC6
::
:
:
:
:
IC3
:
D2
Q1
CN1
SERVO DSP
AUDIO DAC
with BUILT-IN
APC
SIGNAL LINE
B LINE
GND LINE
81
ZDET
C63
0.1
PIO0
AOUT2
AOUT3
PIO2
PIO1
RQ
VDDT3 2
SBSY
52
51
54
53
VSS3
PIO3
56
55
58
57
IPF
SBOK
SFSY
C66
1
74
CP7 10K
C64
0.1
66
AOUT1
60
59
62
61
MS
GPIN
DOUT
64
63
65
BCK
AIN
LRCK
70
68
67
69
LRCKI
BCKI
VSS4
VDD1 3
72
71
73
PVDD3
A
WRC
TMAXS
PDO
LPFO
75
LPFN
TMAX
RVREF
VCOF
PVSS3
SLCO
RFI
78
76
77
79
80
C30 0.01
3300P
C34 0.1
TP87
TP113
TP88
TP53
TP85
VSS1
18
19
20
21
22
23
24
25
TEST
BUCK
BUS3
BUS2
BUS1
BUS0
SRAMSTB
VDDM1
VDD1 2
CCE
RST
VSS2
VDDT3 1
DVSS3 2
DVDD3
DVSS3 1
LO
DVR
RO
XVSS3
XVDD3
XO
XI
IO0
IO1
FGIN
C54
1
C53
0.1
16.934MHz
X1
C52
0.1
10
11
12
13
14
15
16
17
2
VSSP3
VDDP3
VDD1 1
VCOI
DMO
VREF
FMO
6
A
VDD3
8
FOO
TRO
9
TEZI
7
4
FEI
TEI
5
RFRP
SBAD
3
92
TESTR
VRO
RFEQO
RFRPI
VMDIR
RESIN
82
83
84
85
86
AGCI
RFO
RVDD3
LDO
MDI
89
87
88
90
91
C35 0.015
TPI
FNI1
RVSS3
FNI2
FPI2
FPI1
93
94
95
96
97
A
VSS3
TNPC
TNI
RFZI
1
98
99
100
TP108
TP107
R38 22K
C31 0.01
TP52
C44
0.1
R244
2.2M
GND
12
VCC
VC
GND
1
2
3
LD
VR
PD
4
5
6
A
9
C
E
7
8
B
F
10
11
F+
T+
13
14
T-
F-
15
16
R35 5.6K
R36 150K
R37 330K
R33 15K
R34 47K
C39 0.1
R252 1K
0.1
C36
68P
C38
1
C41
TP49
92
97
96
98
95
100
0.033
C47
0.033
C48
TP109
TP38
TP111
TP110
TP39
13
12
10
9
TP105
TP106
TP104
TP103
2200P
C51
0.1
C50
100K
R232
TP50
TP51
4.7K
R243
4.7
R59
0.1
C90
R45 220
330
R233
1M
R46
0.1
C49
97
95
96
98
92
180
R32
10
C72
47P
C27
100
F+
F-
T+
T-
0.015
C26
3.3V
3.3V
C33
TP92
TP91
TP210
TP337
TP116
TP115
TP114
TP117
2.2
R282
66
65
67
TP354
TP352
TP353
2.2
R281
R217 10K
TP206
TP205
0.01
C32
TP43
TP84
TP48
TP42
TP41
TP40
TP71
TP72
TRK-
FCS+
TRK+
FCS-
2.2
R287
47K
R41
110K
R40
0.022
C45
C46 0.01
TP44
TP47
TP46
TP45