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ST1200 Series II
SERVICE MANUAL
B&K COMPONENTS, LTD. 2100 Old Union Road Buffalo, New York 14227-2725 U.S.A.
Schematics
B&K COMPONENTS, LTD. 2100 Old Union Road Buffalo, New York 14227-2725 U.S.A.
A
B
C
D
E
F
G
H
1
V+ R1 10K R3
L BUS
1
+15V R2 100
L OUT
L BUS
33nF
C4
100
2 8 -
6
-
1N4148
D1
U1:B R6 221 LF353
5 +
7
R5 221
U1:A 475 R8
3 + 4
1
10K
R7
OPEN
33nF
C7
1N4148
OPEN
100K
D2
LF353
2
24.3K R21 R24
Q1 2N5401 R18 R22 1K 10K
R BUS 5mA
100K
R13
R15
R14
R16
-15V +15V R20 R23 33nF C9 100
2 8 R BUS
2
24.3K
R OUT
6
100
-
Q2 2N5551 1N4148
3
U3:B R26 221 LF353
5 +
7
R25 221
U3:A
+ 4
1
D3
C13
OPEN
OPEN
100K
OPEN 1N4148 1N4148
LF353
D4
D5
-15V +15V R39 R40 33nF C17 100
2 8 L+R BUS
100K 100
6 -
R28
33nF
R29
R30
R31
R32
R33
R34
133
1K
3
V-
L+R BUS
L+R OUT
3
7
U5:B R44 221 LF353
5 +
R43 221 V+
U5:A
IN1
1
R98 OPEN
IN2
3
+ 4
33nF
C19
OPEN
11
12
100K
100K
R48
R46
R47
C20
1K CON3 R100 1K R101 1K
LF353
R49
10uF NP
NO VOL
9 10
1
C21
R IN
.12uF
LM3886
5
100uF 100V
BUS IN L IN
1K
R99
UES VOL
C18
R45 1.5K
R105 .1 5W
OUT 3
10
R OUT
V IN+
V + V + M U OUT T E 8 3
L BUS
-15V +15V
CH 3
7
8 C W 9
U6
V INGV N D 7 4
L+R BUS
.12uF
C22
50K
W
33.2K
2.26K
R53
R54
R BUS
IN5
NC
C24
R102
L+R
33nF
100
2 8 -
100
6
3
4
1K
CH 3
-
C C W 1 2
R52
R55
R50
R51
2.26K
4
BUS OUT
L+R
3 L OUT
U7:A
+ 4
1
R56 221 33nF C26 OPEN
5
U7:B
+
7
R57 221
CH 4
C25 CON4 100uF 25V
R58 1K R59 33.2K
V-
C23
5
6
100uF 100V
4
LOT ROT
OPEN
R OUT
LF353 100K R63
1 2
100K
R60
R61
R62
CON5 CTRL
CTRL IN
LF353
V+
JUMPER
CTRL OUT
CON15
+LBUS CH 5
10uF NP
NO VOL
9 10
1
C28
C29
-15V R65 10K R66 CON6 +15V R67 R79 10K 33nF C30 100
2 8 -
.12uF
-LBUS
USE VOL
11
12
LM3886
5
100uF 100V
3
4
C27
R64 1.5K
R106 .1 5W
OUT 4
10
L OUT
V IN+
V + V + M U OUT T E 8 3
R68 10K
1
2
3
L BUS *
7
8 C W 9
U8
V INGV N D 7 4
C31
50K
6 1
33.2K
2.26K
R72
R73
U9:A
3 + 4
U9:B
5 +
7
L BUS*
6
5
4
1N4148
R75
D6
1K
221 33nF C33
221 LF353
R BUS
3
4
C C W
OPEN
100K
1N4002
LF353
100K
R77
R78
R80
D7
5
C35
CH 4
1
2
R71
R74
R69
R70
2.26K
DEFEAT
Q3 2N5551
-
W
C34 CON7 100uF 25V
R76 1K R81 33.2K
V-
C32
CTRL
L+R BUS
.12uF
5
6
100uF 100V
SW1
5
D8 1N4002 Q4 R82 R84 3.01K 100uF 25V 100uF 25V 33nF C39 C40 TIP31C +15V
1N965B
33nF
D9
F1 -15V 1N4002 8A SB V+ 10000uF 63V D10
D21 1N4002
V+ R83 5.62 D11 1N4148 R87 10K 1N4148 24.3K D15 R89 Q5 TIP32C 2.2K 5W R86 D12 1N4148
10000uF 63V
33nF
C48
C47
1N965B
1N4002
D16
D17
6
D18 1N4148 R96 133
D19 1N4148 Q7 2N5551
>
R93 3.01K R94 3.01K
C45
C46
SEC IN
D14
40A
10000uF 63V
10000uF 63V
1N965B
AC
-
C51
>
BR1
100uF 100V
C50
+
100uF 100V
1N965B
D13
Q6 TIP31C
C41
C42
3.01K
Title Size Number
ST1200 CH 60W AMP
6
Rev
ESM 1
F2 8A SB V-
1N4002 D22
Q8 D20
TIP32C
-15V
7/7/97
* 4.7K 2W IF V+ >60V
D
Date Filename
1/20/95
P/N 10854/10855/10856
1N4002
ST1200.S01
Drawn by Sheet
of
1
A
B
C
D
E
F
G
H
A
B
C
D
1
0
300VA MULTI SEC/PRI TOROID
BLK BLU
1
43V 27V
VIO
100V 120V
GRY/BLK ORN GRN
* OPTIONAL RED
2
0
BRN
RED
2
27V 43V
GRY/WHT
120V
WHT
YEL
3
THE SECONDARY VOLTAGES LISTED ARE FOR FULL LOAD CONDITIONS. APPROX. MAX DIMENSIONS OF TOROIDAL TRANSFORMER: HEIGHT: 2.65" APPROX. MAX MOUNTING DIM. 4.5" LEAD LENGTH: 9" THE ABOVE PHYSICAL DIMENSIONS ARE MAXIMUM DIMENSIONS.
Title
3
B&K COMPONENTS LTD.
4
Size
Number
B&K P\N 10866
A
7/22/97
300VA MULTI SEC/PRI
Rev -
4
1/18/95 Date 10866.S01 Filename
ESM Drawn by 1 of 1 Sheet
A
B
C
D
Printed Circuit Boards
PCB's
B&K COMPONENTS, LTD. 2100 Old Union Road Buffalo, New York 14227-2725 U.S.A.
Bill of Materials
BOM's
B&K COMPONENTS, LTD. 2100 Old Union Road Buffalo, New York 14227-2725 U.S.A.
File: D:\B&K_Rob\Service Booklets\Bom\ST1200.BOM
7/11/97, 12:02:44PM
Bill of Materials for ST1200 ST1200 MAIN BOARD/POWER SUPPLY/INPUT/VOLUME CONTROL BOARD Comment Pattern Quantity Components -------------------------------------------------------------------12HEADER 2PDTPUSH 4HEADER 5 PIN PCB.SPADE 400V 40A 33nF 12PINHEAD 2PDT.24 4PINHEAD MOLEX5 FASTON.25 BRIDGE CAP 2 1 1 1 8 1 16 CON4,CON7 SW1 CON15 CON12 OUT3, OUT4, AC1, AC2, GND3, GND4, NC1, NC2 BR1 C4, C7, C13, C17, C19, C20, C22, C24, C26, C28, C30, C31, C33, C35, C39, C45 D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D15, D17, D18, D19, D20, D21, D22 F1,F2 U1,U3,U5,U7,U9 U6,U8 Q2,Q3,Q7 Q4,Q6 Q1 Q5,Q8 C18,C27 C21,C23,C29,C32, C50, C51 C25, C34, C40, C46 C41, C42, C47, C48 R52, R71 CON3, CON6 CON5 R1, R7, R18, R65, R68, R79, R87 R22, R29, R58, R75, R76, R98, R99, R100, R101, R102 R105, R106 R13, R15, R28, R31, R33, R46, R48, R60, R62, R77 R14, R16, R32, R34, R47, R49, R61, R63, R78, R80 R2, R3, R20, R23, R39, R40, R50, R51, R67 R21, R24, R89 R5, R6, R25, R26, R43, R44, R56, R57, R69, R70 R30, R96 R45, R64 R53, R59, R72, R81 Page: 1
1N4148
DIODE
18
FUSE 8A SB LF353 LM3886 2N5551 TIP31C 2N5401 TIP32C 10uF NP 100uF 100V POL 100uF 25V POL 10000uF 50V POL 50K POT RCA.X1 RCA.X2 10K 1K
FUSE DIP8 LM3886 TO92 TO220 TO92 TO220 CAP200RP CAP200RP CAP200RP CAP200RP VOLSS.2 RCA.X1 RCA.X2 RES RES
2 5 2 3 2 1 2 2 6 4 4 2 2 1 7 10
.1 5W OPEN 100K
RES RES RES
2 10 10
100 24.3K 221 133 1.5K 33.2K
RES RES RES RES RES RES
9 3 10 2 2 4
File: D:\B&K_Rob\Service Booklets\Bom\10854C.BOM 133 1.5K 2.26K JUMPER 475 3.01K 5.62 2.2K 5W 33.2K LF353 1N965B RES RES RES RES RES RES RES R5W.R RES400 DIP8 D0-35 2 5 10 1 1 4 1 1 10 5 4 R30, R96
7/11/97, 11:58:20AM
R4, R27, R45, R64, R85 R11, R12, R37, R38, R54, R55, R73, R74, R91, R92 R66 R8 R82, R84, R93, R94 R83 R86 R10, R19, R36, R42, R53, R59, R72, R81, R90, R97 U1, U3, U5, U7, U9 D9, D13, D14, D16
Page: 2