Page 1
Reference 200.7-200.5
SERVICE MANUAL
B&K COMPONENTS, LTD.
2100 Old Union Road
Buffalo, New York 14227-2725
U.S.A.
Page 2
6FKHPDWLFV
B&K COMPONENTS, LTD.
2100 Old Union Road
Buffalo, New York 14227-2725
U.S.A.
Page 3
R37
JUMPER
D
C
CON1
1
2
3
4
5
B
Model # # Mosfets Power Output
ST1400 2 Pair/Ch 105 W 8 ohms
ST1400M 4 Pair MONO 150 W 8 ohms
ST2020 3 Pair/Ch 150 W 8 ohms
ST3030 3 Pair/Ch 200 W 8 ohms
EX4420 5 Pair/Ch 200 W 8 ohms
EX4420M 10 Pair MONO 250 W 8 ohms
EX4430 4 Pair/Ch 200 W 8 ohms
REF7450 5 Pair/Ch 200 W 8 ohms
REF7420B 5 Pair/Ch 800 W 8 ohms
REF7420M 10 Pair MONO 1000W 8 ohms
A
R38
JUMPER
1 2 3 4 56
V+
V+b
W2
W8
V-bW9V-a
54321
6
F1
6A SLOW
V+a
W4
+
C13
100 uF 100V
R44
33.2K
+
C12
100uF 100V
F2
6A SLOW
V-
C1
+
10uF/25V
VN
W1
2.26K
1N4751
+
W13
GND1
100 uF 100V
C9
.12uF
P1
R6
133
R7
221
R26
47.5
C7
500
Q8
2N5087 M
R8
221
C10
R13
33.2K
.12uF
Q6
2N5210
Q1
2N5210 M
R3
Q11
2N5210
221
Q3
2N5210
R2
33.2K
R42
47.5K
C8
.12uF
Q10
Q7
2N5087 M
Q5
2N5210
Q2
R18
1M
2N5416
C3
120pF
C11
R9 33.2K
Q9
OPEN
47.5K
2N5210 M
R5
R39
2.26K
2.26K
221
R4
C2
+
100uF/25V
R36
10K
JUMPER
221
R40
221K
Q4
2N5210
+
C4
R14
R12
100uF 25V
P2
500
R10
JUMPER
Q12
2N3440
R15
47.5
2N5210
C15
.12uF
R11
D1
R1
1.5K
J1
WIRE
C2
W14
GND2
.12uF
+
C6
C16
100uF 100V
W7
VP
W6
JN
R16
1.5K
R17
1.5K
R22
1.5K
R23
1.5K
R24
1.5K
2SK1058
R31
+
R25
10uF 25V
475
R27
1.5K
R28
1.5K
R29
1.5K
R30
1.5K
R35
1.5K
JP
C14
QN1
2SJ162
QN2
2SK1058
2SK1058
RP2
RP1
RP6
QP1
.47 5W
.47 5W
2SJ162
.47 5W
RP7
.47 5W
QP2
QN3
2SJ162
QN4
2SK1058
2SK1058
RP4
RP3
RP8
QP3
.47 5W
.47 5W
2SJ162
.47 5W
RP9
.47 5W
QP4
W10
Title
B
Date: 14-Aug-2002 Sheet of
File: C:\B&k_Data\Board_Revs\10842revB\10842b00.DDBDrawn By:
THX Style with Control I/O and 1M Ohm Mod
Number RevisionSize
10842 B
QN5
2SJ162
D2
R20
1N965B
2N5401
33.2K
R19
10K
Q13
D
R21
OPEN
D4
1N4148
MUTE
W5
RP5
.47 5W
W11
W3
W12
OUT1
OUT3
OUT2
RP10
.47 5W
D3
QP5
1N4751
R43
C
B
1K
A
B
1 of 1
ESM
/ SBS
Page 4
54321
CON3
12345
CTRL-OUT
D
D3
1N4148
C
R9
.1 5W
B
C1
27KuF 80V
A
R6
5.62
D5
1N4148
R3
10K
D2
1N4148
BR1 BR2 BR3
GND- GND+ GND- GND+
+
W1
GND-W4GND+
1 2 3 4 56
D4
1N4148
R1
133
Q3 TIP32C
R2
33.2K
Q1
D1
1N4148
AC_BLUE
.1 5W
AC_YELLOW
C2
+
27KuF 80V
2N5551
V- V+ V+V-
V+ V-
R8
R10
.1 5W
C5
27KuF 80V
Q4
TIP31C
D8
1N4002
F3
R7
2.2K 5W
D9
R21
100 2W
D7
D10
1N965B
R22
100 2W
R11
.1 5W
+
C6
+
27KuF 80V
.5A
1N4002
1N4002
R4
R12
.1 5W
27KuF 80V
10K
C3
+
CTRL-IN
R5
10K
D6
1N4148
C7
.033uF
W2
GND-W5GND+
DEFEAT
Q2
2N5551
1K
R14
For Bypass Only-
ZD1
1N965B
GND
R13
.1 5W
C4
+
27KuF 80V
W26
LED+
W25
GND
W27
GND
R17
JUMPER
AON
R18
JUMPER
R16
2 Ohm 10W
RL1
T9ASRELAY 24V
R19
2 Ohm 10 W
RL2
V+
R20
270 5W
T9ASRELAY 24V
R15
910 3W
F1
2 AMP SLO-BLO
F2
2 AMP SLO-BLO
RL3
C8
+
16V 1000uF
D11
1N4002
CON1 AC_IN
D13
1N4002
CON2 AC_IN
D12
1N4002
Title
B
Date: 14-Aug-2002 Sheet of
File: C:\B&k_Data\Ref_7250\12816b00\12816b00.ddbDrawn By:
7250 / 7260 POWER SUPPLY
Number RevisionSize
12816b00 REV B
W7
W19
W13
W8
W20
W14
W9
W21
W15
W10
W22
W16
W12
W24
W18
W11
W23
W17
W3
W6
W28
W29
W30
W31
AON
AON
AON
AON
AON
AON
AON
AON
6
V+
V+
CH_1+
AON
CH_1_EN
V-
CH_1-
VV+
V+
CH_2+
AON
CH_2_EN
V-
CH_2-
VV+
V+
CH_3+
AON
CH_3_EN
V-
CH_3-
VV+
V+
CH_4+
AON
CH_4_EN
V-
CH_4-
VV+
V+
CH_5+
AON
CH_5_EN
V-
CH_5-
VV+
V+
CH_6+
AON
CH_6_EN
V-
CH_6-
VV+
V+
CH_7+
AON
CH_7_EN
V-
CH_7-
VV+
V+
CH_8+
AON
CH_8_EN
V-
CH_8-
V-
11
SBS
D
C
B
A
Page 5
321
4
D
RCA7RCA8
RCA6 RCA5 RCA4 RCA3 RCA2 RCA1
C
8
1234567
3940
2930
3132
3334
3536
3738
2122
2324
2526
2728
1112
1314
1516
1718
1920
CON1
B
GND
JP1
12345678910
8
1234567
CON2
D
C
B
A
Title
Number RevisionSize
A
Date: 17-Jul-2002 Sheet of
File: C:\B&k_Data\7125_RCA_Board\13333a00.ddbDrawn By:
7270/7125 INPUT RCA BOARD
13333a00
REV A
SBS
A
1 2 34
Page 6
321
4
JP1
39 40
D
CH8+
CH7+
CH6+
CH5+
CH4+
CH3+
CH2+
CH1+
C
CON3
CH1-
5
4
3
2
CH1+
1
CH1
CON9
CH2-
5
4
3
B
2
CH2+
1
CH2
CON10
CH3-
5
4
3
2
CH3+
1
CH3
CON15
CH4-
5
4
3
2
CH4+
A
1
CH4
37 38
35 36
33 34
31 32
29 30
27 28
25 26
23 24
21 22
19 20
17 18
15 16
13 14
11 12
9 10
7 8
5 6
3 4
1 2
HEADER 2X20
CH5-
CH5+
CH6-
CH6+
CH7-
CH7+
CH8-
CH8+
CON4
5
4
3
2
1
CH5
CON11
5
4
3
2
1
CH6
CON12
5
4
3
2
1
CH7
CON16
5
4
3
2
1
CH8
SW1
CH2-
CH1-
SW-DPDT
SW2
CH4-
CH3-
SW-DPDT
SW3
CH6-
CH5-
SW-DPDT
SW4
CH8-
CH7-
SW-DPDT
STAR_GND
W1
R1
R9
R2
R10
R3
R11
R4
R12
R5
R13
R6
R14
R7
R15
R8
R16
2.26K
3.01K
2.26K
3.01K
2.26K
3.01K
2.26K
3.01K
2.26K
3.01K
2.26K
3.01K
2.26K
3.01K
2.26K
3.01K
CH2_BAL-
CH1_BAL-
CH4_BAL-
CH3_BAL-
CH6_BAL-
CH5_BAL-
CH8_BAL-
CH7_BAL-
CH1_BAL-
CON1
3
Channel_1
CH1+
2
1
F
CH3_BAL-
CON5
3
Channel_3
CH3+ CH4+
2
1
F
CH5_BAL-
CON6
3
Channel_5
CH5+
2
1
F
CH7_BAL-
CON13
3
Channel_7
CH7+ CH8+
2
Title
1
F
7125-7270 Balance Board
Number RevisionSize
A
Date: 17-Jul-2002 Sheet of
File: C:\B&k_Data\7125_Balance\13321-01.ddbDrawn By:
CH2_BAL-
Channel_2
CH2+
2
CH4_BAL-
Channel_4
2
CH6_BAL-
Channel_6
CH6+
2
CH8_BAL-
Channel_8
2
13321-00 Rev -
3
F
3
F
3
F
3
F
CON2
1
CON7
1
CON8
1
CON14
1
1 of 1
SBS
D
C
B
A
1 2 34
Page 7
321
4
D
C
D
C
CON1
12345
W1
Ctrl
B
W2
GND
R2
Jumper
CON2
B
T
R3
Control I/O Board
Jumper
R1
Jumper
B
A
Title
Date: 17-Jul-2002 Sheet of
File: C:\B&k_Data\Ctrl_IO\13428-00.ddb Drawn By:
CONTROL I/O BOARD non-push button
Number RevisionSize
A
13428-00 REV -
SBS
A
1 2 34
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