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Kenwood KRF-V4550D Service Manual page 8

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K
L
(X07-3142-71) (A/3)
R105
100
1
(AUDIO)
J3
MM: 2.5V
C103
R101
10u35
Lch 1
+
1K
PHONO
C104
R102
10u35
Rch 2
+
1K
LINE: 200mV
R117
Lch 3
1K
R106
100
CD
R118
Rch 4
2
1K
R121
Lch 5
1K
MD/TAPE
REC
R122
Rch 6
1K
R125
Lch 7
-11.8V
1K
MD/TAPE
PLAY
R126
Rch 8
1K
J4
R
R129
Lch 1
1K
3
MONITOR
REC
L
R130
Rch 2
1K
R133
Lch 3
1K
MONITOR
PLAY
R134
Rch 4
1K
11.8V
R137
Lch 5
1K
+12V
VIDEO1
OUT
R138
REC OUT BUFFER
Rch 6
1K
IC107(1/2)
R141
C137
Lch 7
4
2.2u50
1K
+
VIDEO1
IN
R142
Rch 8
1K
C138
2.2u50
+
IC107(2/2)
5
-11.8V
R
L
X07-B/3
-CN5
1/4
6
A
11.8V
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to
parts list).
indicates safety critical components. For continued protection against risk of fire, replace only with same
type and rating fuse(s). To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried
out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
7
M
N
+12V
IC105(1/2)
C115
R115
8
3
1
4.7u35
100
2
+
R107
C111
C113
360
0.012
3300P
R109
R111
270K
22K
R110
R112
PHONO
270K
22K
EQ AMP
C112
C114
R108
0.012
3300P
360
C116
R116
6
7
4.7u35
100
5
-11.8V
+
4
IC105(2/2)
12V
W339
R381
1K
12V
IC106
(BOTTOM VIEW)
INPUT/REC
OUT
SELECTOR
R382 1K
R383 1K
17
R157 100
11.8V
IC108(1/2)
C141
C145
2.2u50
5
8
22u16
7
+
6
+
8
5
7
6
LINE BUFFER
C146
2
2
C142
1
1
22u16
2.2u50
3
3
+
+
4
4
IC108(2/2)
12V
22
-11.8V
13
21
R384
1K
19
IC109
4
+12V
(BOTTOM VIEW)
5
12V
INPUT/
ATT
SELECTOR
+12V
O
P
IC110-112
11.8V
20dB AMP
+12V
12V
IC110(1/2)
8
C153
5
10u50
R173
7
6
+
R167
C149
2.2K
LSch
R355
1.8K
47u25
R171
LSch
R375
10K
+
18K
1K
Q1
C151
Q5
10P
C152
R376
10P
R356
1K
10K
R168
C150
1.8K
47u25
R172
Q6
+
RSch
18K
C154
R174
RSch
Q2
2
1
10u50
2.2K
3
+
4
Q5,6,11,12,17
IC1,2,7,8,13,14
IC110(2/2)
MUTING
20dB ATT
Lch
IC111(1/2)
(MAIN OUT)
C181
5
8
7
10u50
R219
6
+
R213
C177
2.2K
R357
1.8K
47u25
R217
R377
10K
+
1K
18K
Q7
C179
Q11
10P
C180
-11.8V
R378
R358
10P
1K
R214
C178
10K
1.8K
47u25
R218
Q12
+
Rch
Q8
18K
C182
R220
2
Rch
10u50
2.2K
1
3
+
4
IC111(2/2)
IC112(1/2)
Cch
C208
8
5
7
10u50
R255
6
+
R252
C206
2.2K
R359
1.8K
47u25
R254
Cch
10K
R379
+
18K
Q17
1K
Q13
C207
10P
C222
100P
R360
R272
C221
R379
10K
Q16
240
100u10
R274
1K
+
SWch
Q14
18K
C223
R275
2
SWch
1
10u50
1.2K
3
+
4
R380
IC112(2/2)
W182
820 1/4W
R353
Q51
1K
R363
R373
Q52
Q53
360
360
20dB ATT
CONT.
PRE OUT
CONT.
+B
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
CN3
CN6
D
Q
R
+12V
LS
RS
+B
58.4V
L
R321
+B AVR
47
Q133
R320
R322
10K
10K
Q134
58.0V
Q132
R
Q135
PACK
CONT.
R388
47K
C259
C
100u10
+
Q136
SW
+12V
-29.7V
30V
+12V
12V
8.0V
+B
+5V
5 4 3 2 1
33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15
CN2
CN7
The DC voltage is an actual reading measured with a high impedance type voltmeter with no signal input.
The measurement value may vary depending on the measuring instruments used or on the product.
S
T
IC101
POWER AMP
(LS,RSch)
-58.4V
58.4V
+B
+B
56.0V
R391
R393
Q137
47
47
+B
56.2V
-56.7V
-56.2V
Q138
-58.4V
-B AVR
B
R201
30K
30V
+12V
12V
8.0V
ON : 1.6V
OFF : 4.6V
14 13 12 11 10 9 8 7 6 5
4 3 2 1
E

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