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Cassette Player
RS-DV290EG
Service manual
Technics RS-DV290EG Service Manual page 40
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A
MAIN CIRCUIT
DECK1
CP101
1
H
Lch
2
PLAYBACK
3
HEAD
4
Rch
5
G
R107
10K
(8.9V)
0V
G
S
D
0V
0V
Q103
Q104
0V
0V
S
D
Q105,106
R131
F
2SD1819ARTX
G
0V
330K
(8.9V)
MUTING
DECK2
Lch
CP102
E
1
R/P HEAD
2
Rch
3
4
ERASE
HEAD
5
D
R132
IC103
27K
BA7755AF
R/P SELECT
6V
8
7
6
5
1
2
3
4
0V
9.6V
0V
C
(9.5V)
R313
1
B
(0.7V)
TP301
TP302
ERASE CURRENT
CHECK POINT
A
1
R101
5.6K
0V
0V
S
D
G
(0.2V)
Q101
C143
C115
9V
470P
470P
2SJ164RTA
HEAD SELECT
(REC:ON)
IC101
CXA1998BQT6
R/P EQ AMP
R111
82
Q105
(0.7V)
0V
0V
R143
100
Q103,104
2SJ164QTA
HEAD SELECT
(PLAY:ON)
R141
100
R142
0V
100
Q106
0V
R144
(0.7V)
100
C110
0.018
R106
C144
330K
470P
(0.2V)
9V
G
S
D
0V
0V
Q102
2SJ164RTA
HEAD SELECT
(REC:ON)
C124
25V4.7
L301
4
3
5
2
6
1
Q302
0V
0V
2SD1328STXRA
SWITCHING
(REC:ON)
R301
D301
R303
10K
MA111TX
2.2K
(0.6V)
0V
Q306
0V
DTC144EUT106
BIAS OSC CONT.
2
3
:POSITIVE VOLTAGE LINE
C123
25V4.7
C150
10V100
C117
330P
C129
R117
10V22
1K
9V
9V
4.5V
36
35
34
33
R113
RFS
12K
1.2V
37
R109
1K
2.6V
IREF
38
C109
0.018
2.6V
39
1.3V
40
0V
41
0V
42
0V
43
0V
44
1.3V
45
2.6V
46
2.6V
47
MUTE
1.2V
48
1
2
3
4
0V
5V
0V
0V
R133
33K
(1.6V)
(0.2V)
R130
4.7M
C118
C139
6.3V47
330P
R154
2.7K
A
B
9.6V
C307
1000P
(0.6V)
9.5V
0V
Q303
0V
(0.1V)
(0.1V)
(0.6V)
0V
0V
9.5V
Q304
C323
1000P
Q303,304
2SD1450RSTA
BIAS OSC
(0.7V)
0V
Q301
(0.6V)
2SD1819ARTX
0V
Q305
BIAS OSC CONT.
0V
DTC144EUT106
BIAS OSC CONT.
4
: RECORDING SIGNAL LINE
R157
22K
9.6V
4.5V
4.5V
4.5V
4.5V
5V
0V
32
31
30
29
28
27
26
25
AGC
GAIN
RECEQ
SHIFT
REGISTERS
PBEQ
CTL
AGC
LATCHES
REQEQ
CTL
20K
20K
AGC
GAIN
RECEQ
AMS
20K
20K
5
6
7
8
9
10
11
12
4.5V
4.5V
4.5V
4.5V
4.5V
8.6V
5V
R158
22K
R310
4.7K
R311
4.7K
D102
R135
MA111TX
6.8K
D101
R134
MA111TX
(0.8V)
3.9K
0V
5
: PLAYBACK SIGNAL LINE
E
D
F
C
O
R725
2.2K
0V
5V
24
5V
23
(9.6V)
0.1V
22
(0.1V)
9.6V
21
20
Q107
19
DTA14
R/P SEL
18
(0.2V)
(0.2V)
9.6V
9.6V
17
16
15
(0.2V)
5V
14
(5V)
0.2V
13
A
B
C
6
7
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