BOSE SD262087SH2 Schematic
A
BCD EFGH
1
2
3
4
5
6
Cable from
Display Assy
CH1 Input Cable
from Amplifier PCB
CH2 Input Cable
from Amplifier PCB
Digital Interface
A
Signal Presence Ch#1
Signal Presence Ch#2
Cable Header
-15V
+15V
Sig Com
Ch2 Master
VCA 5V
Sig Com
Ch1 Master
VCA 5V
Powergnd
Comm/Alert
Clipped Ch#2
Display Ch#2
Clipped Ch#1
DIsplay Ch#1
Amplifier On
Protect
Thermal
J601
J602
J101
J700
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
-15V
2
+15V3
3
4
MSTR_VCA_CH2
5
6
7
MSTR_VCA_CH1
8
MSTR_VCA_5V
9
10
11
COMM/ALERT
12
CLIPLED2
13
DISPLAY2
14
CLIPLED1
15
DISPLAY1
16
SP-LED1
17
AMP-0N-LED
18
SP-LED2
19
PROTECT-LED
20
THERMAL-LED
IOUT+CH1
IOUT-CH1
THERMAL-SW1
THERMAL-SW
+15V3
-15V
CH1-IN
CH2-IN
H-MUTE
MUTE
IOUT+CH2
IOUT-CH2
10 Ohm (F) 1/4W 5%
COMM/ALERT
IOUT+CH1
IOUT-CH1
IOUT+CH2
IOUT-CH2
CLIP_ELIM_CH1
CLIP_ELIM_CH2
OLOAD1
OLOAD2
B
R474
SHT4
SHT4
SHT4
C586
C585
330PF
OVERLOAD
10.0K
R430
VSPOS
D425
D426
1N4148
R426
4.32K
IOUT-CH2
330PF
IOUT-CH1
VSPOS
VSNEG
R428
4.32K
1K
1K
R463
100K
R455
R461
100K
R462
R425
10.0K
R427
10.0K
5%
5%
NOTES
Unless otherwise noted:
1. Resistors are 1/8W 1% metal film, in Ohms;
Capacitors in uF;
Diodes are 1N4148.
+15V3
THERMAL-SW1
IOUT-CH2
IOUT-CH1
PS-UP
R472
22.6K
R446
100K
C436
.0033
R449
100K
C437
.0033
R473
22.6K
C
C438
100PF
R447
20.0K
R450
20.0K
C441
100PF
R431
10.0K
Threshold:
13.1V HiBound
12.0V LoBound
C428
1/50V
R458
10.0K
R433
10.0K
THERMAL-LED
D428
R435
16.5K
+15V3
R434
36.5K
R452
18K
5%
U426:A
LM339
+15V3
4
-
5
+
-15V
U426:B
LM339
6
-
7
+
U426:C
LM339
8
-
9
+
U426:D
LM339
10
-
11
+
C431
0.1
4
3
2
5
+
12
U425:A
LM339
D435
OPEN
12V
+15V3
C449
0.1
3
2
12
C450
0.1
1
+15V3
14
13
G r o u n d i n g S y m b o l K e y
D
R437
100K
5%
Q426
2N4403
C435
1/50V
R444
36K
5%
R468
12.5V
47K
5%
OVERLOAD
2.5V
CH1 Clip Limiter
Control
To J800
Sht 1
R451
36K
5%
R469
47K
5%
12.5V
OVERLOAD
2.5V
CH2 Clip Limiter
Control
C h a s s i s G n d
I n p u t G n d
P o w e r G n d
R438
1.5K
1/4W
5%
D429
D431
D446
+15V3
C448
0.1
4
-
5
+
6
-
7
+
U427:D
10
-
11
+
8
-
9
+
To J800
Sht 1
D430
C432
100/25V
U427:A
LM339
3
2
12
U427:B
LM339
1
CLIP_ELIM_CH1
SW6:CLC1
+15V3
LM339
13
U427:C
14
LM339
CLIP_ELIM_CH2
SW2:CLC2
+15V3
R442
100K
5%
2.5V
H-MUTE
+15V3
+15V3
MUTE
C434
0.1
U425:B
6
-
7
3.2V
+
U428:B
6
6.1V
-
7
+
+15V3
4
-
5
+
10.0K
R429
R476
C L I P L I M I T E R C H A N N E L 1
4.32K
R477
7.5K
5%
R478
7.5K
5%
R481
5%
100
R600
10.0K
R487
4.32K
C L I P L I M I T E R C H A N N E L 2
R488
7.5K
5%
R483
7.5K
5%
R485
100
5%
R601
10.0K
LM339
LM339
3
12
1
1
R456
10.0K
2
U428:A
LM339
Q427
2N4401
Q428
2N4401
Q431
2N4401
Q430
2N4401
Q429
2N4401
Q432
2N4401
R464
10.0K
R439
4.32K
E
3.2V
R441
1.5K
1/4W 5%
R479
2.21K
R453
1.5K
1/4W 5%
R484
2.21K
AMP-0N-LED
U425:C
8
9
+15V3
U516:A
VTL5C4
LM339
-
+
R448
4.99K
R489
1.50K
1
CLIPLED2
R486
1.50K
1
VTL5C4
U517:A
14
CLIPLED1
2
2
R445
1.5K
1/4W
5%
3.2V
D433
12.5V 6.1V
R465
13.0K
C440
10/35V
+15V3
+15V3
F
PROTECT-LED
R466
4.99K
R460
1.5K
1/4W
5%
Q433
2N4401
U428:C
LM339
8
-
9
+
U428:D
LM339
10
-
11
+
+15V3
14
+15V3
13
U425:D
10
-
11
+
R467
6.04K
LM339
R454
47K
5%
R440
1.50K
3.2V
D443
R457
1.5K
1/4W
5%
2.5V
R443
4.99K
R459
10.0K
C439
33/16V
D445
2.5V
OVERLOAD
13
P300
1
SIGNAL GND
2
SIGNAL GND
3
+15V2
-15V2
+15V
-15V
+15V3
VSNEG
THERMAL-SW
PS-UP
VSPOS
+15V2
4
+15V2
5
-15V2
6
-15V2
7
SIGNAL GND
8
SIGNAL GND
9
+15V1
10
+15V1
11
-15V1
12
-15V1
13
+15V3
14
+15V3
15
POWER GND
16
POWER GND
17
VSNEG
18
THERMAL SW
19
PS UP
20
VSPOS
Service Manual Part Number 216306 Rev. 00
G
R432
10.0K
R436
10.0K
OLOAD1
OLOAD2
Cable to Rectifier PCB Assy
Model 2150 Amplifier
Signal Processor PCB
Part Number 262087
Sheet 2 of 2
1
2
3
4
5
6
H
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