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Kenwood Manuals
Stereo Receiver
R-V251
Service manual
Schematic Diagram - Kenwood R-V251 Service Manual
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U
V
MAIN UNIT
B
+B
13
R122
+B
4.7K
C114 330P
R116
R118
+
10K
10K
MICRO.
COMPUTER
I/F
R112
R108
C104
22K
33K
10u50
+
0V
AVS2
40
DAC2
LO2
39
RIN
38
ADC2
AVD6
37
R93
C125
R141
R143
R145
C129
1
10u50
1.2K
5.6K
8.2K
AVS6
36
220u6.3
+
+
R139 100K
XSOUT
35
DAC4
Trim VOL
C128
AUSX
34
C130
XTLI
33
0.1
22P
C131
C132
XTLO
32
0.01
22P
AUDX
31
+B
XCOUT
30
R140 100K
DAC3
Trim VOL
AUS5
29
C127
+
C126 10u50
R142
R144
R146
220u6.3
R92
+
AUD5
28
1.2K
5.6K
8.2K
1
ADC1
LIN
27
LO1
26
0V
AUS1 25
R109
R107
C103
15K
33K
10u50
DAC1
+
4.9V
C64 100P
C113 330P
C293
C140
1000P
220u6.3
+
C139
R115
R117
10K
10K
0.1
+B
C141
0.1
R293
47K
+B
R292
100
R89
2.2
+B
5.0V
+
+
+B
B
W
X
B
B
3
4
6.6V
+B
+B
IC107
(BOTTOM
VIEW)
OUTPUT PORT
ELECTRIC
TONE
/VOLUME
4.3V
R126 10K
RcH
C110
6
7
10u50
5
+
IC111
R75
R76
8
(2/2)
220
750
1W
R129
+B
39K
RcH
6
C102
7
10u50
R102
5
+
IC110
8
2.2K
0V
(2/2)
+B
R57
10K
R149 47K
C119 100P
ScH
C32
1u50
6
C117
R
+
7
10u50
3.3K
R56
5
+
22K
8
IC112 (2/2)
+B
-15.1V
R55
1K
R12
4.7K
ZD21
B
IC112 (1/2)
3
4
C118
1
10u50
R51
2
+
1K
C120 47P
CcH
R13
4.7K
R150 47K
R52 100K
R53 47K
2
C101
R101
1
C31 22u16
10u50
2.2K
3
+
+
IC110
4
ON:3.6V
0V
OFF:-4.9V
(1/2)
B
4.3V
R125 10K
LcH
C109
2
10u50
1
3
+
+B
IC111
4
(1/2)
MUTE
OM:2.5V
OFF:4.7V
B
B
10dB ATT
OFF:2.5V
+B
B
Y
Z
C IN
L S IN
SW IN
B
+
+
+
C148
C150
C149
C160
C159
100P
100P
100P
100P
100P
TONE
TONE
MCU
I/F
C50
220P
-6.9V
R74
220
1W
+
C244
100P
R171
C175
R195
470
4.7u50
2.7K
+
FL
R189
1K
-10dB ATT
OFF:3.7V
R190
FR
1K
R172
C176
R196
470
4.7u50
2.7K
Q111
+
MUTE
R175
C179
R199
ON:3.6V
470
4.7u50
2.7K
OFF:3.7V
+
R49
680
R193
1W
CENTER
1K
Q110
R191
LS
1K
R173
C177
R197
470
4.7u50
2.7K
+
R174
C178
R198
470
4.7u50
2.7K
+
R192
RS
1K
R194
SW
1K
R176
C180
R200
470
4.7u50
2.7K
+
14.9V
+B
+B
AA
AB
B
B
+B
C54
0.01
R136
100K
C55
+
100P
-15.1V
4
8
14.9V
B
B
IC113
IC113
(2/2)
(1/2)
+
R134
3.3K
R288
100K
+
R133
15K
B
Q113-118
Q119-124
-10dB
MUTING
ATT
C187
R201
1u50
1K
MUTE
+
ON:1.4V
OFF:-4.9V
R213
Q119
2.2K
R231
R232
Q113
100K
100K
Q114
Q120
+
+
R214
R234
R235
56K
56K
2.2K
+
C188
R202
1u50
1K
C205
C206
100P
100P
+
C191
R205
0V
1u50
1K
+
R217
2.2K
Q115
Q121
Q117
Q123
R215
2.2K
C189
R203
1u50
1K
+
C190
R204
1u50
1K
+
R216
2.2K
Q118
Q124
Q116
Q122
R218
2.2K
+B
AC
AD
B
+B
IC103
POWER AMP (FRONT)
0V
0V
-44.2V
C194
C193
100P
100P
+
+
R222
R221
56K
56K
R220
R219
+
+
100K
100K
21
47.2V
R233
100K
+
R236
56K
+
+
C207
100P
0V
-44.2V
+B
1
2
3
4
5
6
7
CN701
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