Infinity ENTRA, Service Manual

Page: 23 / 25

Entra Subwoofer
23
Preamp Schematic
L.L
2K8
R130
.47u 63V
C123
R131
44K2
L.L
3
21
Q101
C1815
.47u 63V
C125
-15V
+15V
100u 16V
C128
C127
100u 16V
6
5
7
IC102:B
TL072
C124
1000u 16V
6 5 4 3 2 1
H
G
F
E
D
C
B
A
6 5 4 3 2 1
A
10
9 8 7
E
D
C
B
H
10 9 8 7
F
G
200K
R103
200K
R104
200K
R105
200K
R106
1K 1W
R101
SPEAKER
IN PUT
1
2
3
4
+
-
LCH
RCH
-
+
JK102:A
5
6
7
8
+
-
LCH
RCH
-
+
JK102:B
R102
1K 1W
VARIABLE LPF
220P 50V
C107
OUT PUT
SPEAKER
1N4148
D103
1N4148
D104
C110
.1u 63V
C102
10u 25V
C105
220P 50V
R107
1K R112
7K5
3
2
1
11
4
TL074
IC101:A
.47u 63V
C113
R116
5K11
3
2
1
20KB
VR101:A
6
5
4
VR101:B
20KB
C103
10u 25V
220P 50V
C106
D101
1N4148
D102
1N4148
.1u 63V
C109
R110
7K5
R117
5K11
.022u 50V
C108
.22u 63V
C104
C114
.1u 63V
21K5
R111
10K
R109
13
12
14
TL074
IC101:D
6
5
7
TL074
IC101:B
R118
15K
16K9
R120
11K
R122 0
VOLUME CONTROL
10
9
8
IC101:C
TL074
R127
10K
C121
.1u 63V
R123
1K
3
2
1
4
8
TL072
IC102:A
C122
.1u 63V
R124
10K
C118
.1u 63V
180
PHASE SW
2
1
3
SW101
R136
10K
3
2
1
VR102
20KB
R125
10K
C120
10u 16V
R121
10K
1N4148
D109
3
2
1
4
8
IC103:A
BA4558
C119
.1u 63V
R138
1K
C111
22u 16V
R126
220K
Normal
Direct
2
1
3
JK101
R137
15K4
100K
R133
180K
R128
75
61
2
3
4
CN101
R132
3K3
GRN
R135
10K
3
2
1 A1015
Q102
220K
R129
3
2 1
Q103
A1015
R134
3K3
RED
2
3
1
D110