Technics RS-DV290EG Service Manual page 51

A
MAIN CIRCUIT
R101
5.6K
0V 0V
S D
Q101 G (0.2V)
C143 C115
DECK1 CP101 9V
470P 470P
2SJ164RTA
1
H
HEAD SELECT
Lch
(REC:ON)
2
PLAYBACK
3
HEAD
4
Rch
5
R111
82
Q105
G
R107
(0.7V)
10K
0V
(8.9V) 0V
G 0V
R143
100
S D
0V 0V
Q103,104
Q103
2SJ164QTA
Q104 HEAD SELECT
(PLAY:ON)
0V 0V
R141
S D
Q105,106
R131
F 2SD1819ARTX
G 0V
330K
R142
(8.9V) MUTING 0V
Q106
0V
R144
(0.7V)
100
R106 C144
DECK2 330K 470P
Lch
CP102 (0.2V)
E 9V G
1
R/P HEAD
S D
2
Rch 0V 0V
Q102
3
2SJ164RTA
HEAD SELECT
4
(REC:ON)
ERASE
HEAD
5
C124
25V4.7
D
R132
IC103
27K
BA7755AF
R/P SELECT
6V
8 7 6 5
1 2 3 4
0V
9.6V 0V
C
(9.5V)
L301
4 3
5 2
R313
1
6 1
B
Q302
(0.7V)
0V
TP301 TP302
0V 2SD1328STXRA
SWITCHING
(REC:ON)
R301 D301 R303
ERASE CURRENT
10K MA111TX 2.2K
CHECK POINT
(0.6V)
0V
A Q306
DTC144EUT106
BIAS OSC CONT.
1 2
:POSITIVE VOLTAGE LINE : RECORDING SIGNAL LINE
C123
25V4.7
9.6V
C150
10V100
C117
330P
C129 R117
10V22 1K
IC101
9V 9V 4.5V 4.5V 4.5V 4.5V 4.5V
CXA1998BQT6
36 35 34 33 32 31 30 29 28
R/P EQ AMP
R113 AGC
RFS
12K GAIN
RECEQ
1.2V
37
R109
1K
2.6V
IREF
38
C109
0.018
2.6V
39
SHIFT
1.3V REGISTERS
40
0V PBEQ
41
CTL
100
0V
42
AGC
100
0V
43
REQEQ
CTL
0V
44
1.3V
45
C110
0.018
2.6V
46
20K 20K
2.6V
47
MUTE
AGC
GAIN
1.2V
48
RECEQ AMS
1 2 3 4 5 6 7 8 9
0V 5V 0V 0V 4.5V 4.5V 4.5V 4.5V 4.5V
R133 33K
(1.6V) (0.2V)
R130 4.7M
C118
C139 6.3V47
330P
R154
2.7K
R158 22K
A
B
9.6V
C307
1000P
R310
(0.6V)
9.5V
4.7K
0V
Q303
0V
(0.1V)
(0.1V)
R311
(0.6V)
0V
4.7K
0V
9.5V
Q304 C323
1000P
R135
6.8K
Q303,304
2SD1450RSTA
BIAS OSC R134
(0.8V)
3.9K
(0.7V)
0V
0V
Q301
(0.6V)
2SD1819ARTX
0V
0V Q305 0V BIAS OSC CONT.
DTC144EUT106
BIAS OSC CONT.
3 4 5
: PLAYBACK SIGNAL LINE
E
R157 D
22K
F
C O N M R
R725
2.2K
5V 0V 0V
27 26 25
C203
25V4.7
5V
24
5V
23
(9.6V)
0.1V
22 A
(0.1V)
9.6V
21 B
20
Q107
19
DTA143EUT106
LATCHES
R/P SELECT
18
9.6V
(0.2V) (0.2V)
9.6V 9.6V
17
0V
16
(9.5V)
15
(0.2V)
5V
14
(5V)
0.2V
13
20K 20K
10 11 12
8.6V 5V
A
D102
MA111TX
B
D101
PLAYBACK
MA111TX
GAIN ADJ.
C
(DECK1/Rch)
6 7 8
5V
C207
270P
R209 R211
1K L201 10K
C205
50V1
R237 R220
22 22
DOLBY
ON : 0V
4.8V 9.6V 4.7V 4.7V 4.6V
1 2 3 4 5
ON/OFF
IC201
CXA1552M-T4
DOLBY B NR
ATT1
ATT2
ATT3
ATT3
ATT2
ATT1
C208
R/P
270P
16 15 14 13 12
4.8V 4.7V 1.2V 4.6V
C204 R210 R212
(0V)
25V4.7 1K L202 10K
DOLBY
Rch
R216 C214
12K 25V4.7
(0V)
5V
5V
Q202
DTA143EUT106
R/P SELECT
B
A
B
PLAYBACK
GAIN ADJ.
(DECK1/Lch)
A
(9.6V)
0V 0V 0V 0V 0.1V
1 2 3 4 5
PLAYBACK
GAIN ADJ.
(DECK2/Lch)
IC102
MC14066BFEL
DECK 1/2 SELECT
14 13 12 11 10
9.6V 9.6V 9.6V 0V 0V
(0.1V) (0.1V)
PLAYBACK
GAIN ADJ.
(DECK2/Rch)
9 10
DOLBY
Lch
C B A
R221 C225
100 25V4.7
C218
50V0.1
4.7V 0.4V 4.8V
6 7 8
SC DET
SC DET
11 10 9
4.7V 0.4V 4.8V
C226
25V4.7
(5V) 5V
0V 0V
I
5V
J
Q201
DTA143EUT106
DOLBY ON/OFF
(9.6V)
0.1V
6 7
9 8
0V 0V
RS-DV290(EG) MAIN CIRCUIT DIAGRAM
11 12