B and K ST-1200 Mk2 Service manual
ST1200 Series IIST1200 Series II
SERVICE MANUAL
B&K COMPONENTS, LTD.
2100 Old Union Road
Buffalo, New York 14227-2725
U.S.A.
SchematicsSchematics
B&K COMPONENTS, LTD.
2100 Old Union Road
Buffalo, New York 14227-2725
U.S.A.
HGFEDCBA
1
V+
D1
1N4148
R7
R8
10K
D2
1N4148
2
R21
24.3K
R24
D3
R28
OPEN
D5
D4
1N4148
3
L IN
R IN
NC
L+R
LOT
ROT
CTRL IN
CTRL OUT
SW1
6 5 4
V+
1N4148
4.7K 2W IF V+ >60V*
1N4148
1N4148
IN1
IN2
CON3
R100
IN5
L+R
L OUT
R OUT
CON5
CTRL
CON6
10K
R65
21
3
D6
1N4148
C35
33nF
Q5
R83
5.62
TIP32C
D11
D12
1N4148
R87
10K
D19
D18
1N4148
R96
133
BUS IN
4
BUS OUT
CTRL
DEFEAT
5
6
D15
R98
ABCDEFGH
1
TIP31C
TIP32C
L BUS
R BUS
L+R BUS
2
3
V+
UES VOL
NO VOL
L BUS
L+R BUS
CH 3
R BUS
CH 3
CH 4
2
4
USE VOL
NO VOL
CH 5
L BUS *
L+R BUS
L BUS*
R BUS
CH 4
11
9
7
5
3
1
CON4
11
9
7
5
3
1
CON7
+15V
C40
C39
33nF
100uF 25V
C46
C45
33nF
100uF 25V
-15V
C18
12
10uF NP
10uF NP
R45
1.5K
C
W
W
50K
R52
C
C
W
R54
R55
R53
2.26K
2.26K
33.2K
C25
100uF 25V
C27
R64
1.5K
C
W
W
50K
R71
C
C
W
R73
R74
R72
2.26K
2.26K
33.2K
C34
100uF 25V
10
8
6
4
2
12
10
8
6
4
2
LM3886
1
5
10
V
V IN+
+
U6
G
9
N
V IN-
D
7
R58
1K
R59
33.2K
1
10
V
V IN+
+
U8
G
9
N
V IN-
D
7
R76
1K
R81
33.2K
C20
V
+
M
3
U
OUT
T
E
V
8
4
C22
V-
V+
LM3886
5
C28
V
+
M
3
U
OUT
T
E
V
8
4
C31
V-
R105
C21
.12uF
100uF 100V
C23
.12uF
100uF 100V
R OUT
.1 5W
OUT 3
4
R106
C29
.12uF
100uF 100V
C32
.12uF
100uF 100V
L OUT
.1 5W
OUT 4
5
Title
Size
D
7/7/97
Date
1/20/95
Filename
ST1200 CH 60W AMP
P/N 10854/10855/10856
ST1200.S01
Drawn by
6
RevNumber
-
ESM
11
ofSheet
R1
10K
L BUS L OUT
2
3
R13
R14
OPEN
R BUS
2
3
R32
R31
OPEN
2N5401
475
24.3K
1N4148
Q1
1K
R22
5mA
Q2
2N5551
1K
133
R29
R30
R18
10K
1N4148
V-
2
R99
1K
1K
R101
1K
1K
R102
1K
R66
JUMPER
Q3
2N5551
1K
R75
D7
D9
1N965B
R89
24.3K
2N5551
1N4002
D10
1N4002
Q6
R86
TIP31C
2.2K 5W
D16
D17
1N4002
1N965B
Q7
3
R47
R46
OPEN
2
3
R61
R60
OPEN
2
3
R78
R77
OPEN
+15V
R3
100
C4
8
-
U1:A
+
100K
R23
100
-
U3:A
+
100K
R40
100
-
U5:A
+
100K
R50
100
-
U7:A
+
100K
R67
100
-
U9:A
+
100K
33nF
R6
1
1
1
1
1
SEC IN
221
C7
33nF
-15V
+15V
C9
33nF
R26
221
C13
33nF
-15V
+15V
C17
33nF
R44
221
C19
33nF
-15V
+15V
C24
33nF
R56
221
C26
33nF
-15V
+15V
C30
33nF
R69
221
C33
33nF
F1
-15V
8A SB
+
>
BR1
-
AC
40A
>
F2
8A SB
4
LF353
8
4
LF353
8
4
LF353
8
4
LF353
8
4
LF353
R79
V+
V-
R OUT
L+R OUTL+R BUS
C41
C47
R15
R33
R48
R62
10K
R80
D21
1N4002
10000uF 63V
10000uF 63V
1N4002
D22
OPEN
OPEN
OPEN
OPEN
100K
C42
C48
6
5
R16
100K
6
5
R34
100K
6
5
R49
100K
6
5
R63
100K
-LBUS
+LBUS
6
5
10000uF 63V
10000uF 63V
R2
100
-
U1:B
+
R20
100
-
U3:B
+
R39
100
-
U5:B
+
R51
100
-
U7:B
+
R68
10K
-
U9:B
+
R84
3.01K
C51
R93
3.01K
LF353
LF353
LF353
LF353
LF353
100uF 100V
R5
7
221
R25
7
221
R43
7
221
R57
7
221
1
3
CON15
R70
7
221
D8
1N4002
Q4
R82
3.01K
D13
1N965B
C50
100uF 100V
D14
1N965B
R94
3.01K
Q8
D20
1N4002
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