BOSE SD195178 02 04 Schematic
C
B
A
8
BASS IN
LEFT IN
RIGHT IN
AUDIO GND
MUTE/STANDBY
THERMAL
+12V OUT
-12V OUT
BASS OFFSET
LEFT SPKR + OUT
LEFT SPKR - OUT
RIGHT SPKR + OUT
RIGHT SPKR - OUT
FROM TRANSFORMER
SECONDARY
D181
BAV99L
D281
BAV99L
D
SH
C186
1000P
2
C286
1000P
R194
0.1
1W,SMD
R195
0
Q181
2SC3395
2SC3395
R294
0.1
1W,SMD
R274
5.90K
THIS DRAWING IS BASED ON
P-CAD DATA ALL CHANGES
MUST BE MADE USING THE
P-CAD FILES ATTACHED TO
32108
CAT. CODE
D182
Q281
SD
R295
0
L_OUT
R174
5.90K
0
R196
SHORT
CIRCUIT
DETECT
THERMAL
0
R296
D282
R_OUT
MD198604.
PCB 198604
**SCALE
195178
SHEET 2 OF 2
1
DD
C
B
A
REVDWG NO.CLASSFSCMSIZE
04
7
R380
100K
2SA608
BASS CHANNEL
CLASS-G POWER
AMPLIFIER
C388
R378
100K
C15
.1
100V,6A
C18
.1
D380
1
1.0
5.1V
1
B1
GBU6B
2SC536
Q377
C385
+40V
+12V
-12V
C17
B2
100V,6A
0
C16
.1
.1
GBU6B
L_OUT
R_OUT
R375
14.3K
Q375
C373
100
Z380 Z381
Z Z
D
S
1
C377
1.0
THERMAL
R11
N.U.
B_IN
+40V
M
M106
1
J2
2
J2
3
J2
4
J2
5
J2
6
J2
7
+40V
J2
8
J2
9
J2
10
J2
11
J2
12
J2
13
J2
14
J2
1
J1
2
J1
3
J1
4
J1
5
J1
B_IN
M
M107
L_IN
M
M108
R_IN
M
M109
M
M110
M
M111
M
M112
R10
M
14.3K
M113
M
M114
M
M115
M
M
M116
M133
M
M117
M
M
M118
M134
M
M119
M
M101
M
M102
M
M103
M
M104
M
M105
Q379
R381
2.49K
R382
C389
270P
R383
200
200K
R379
10M
2SB560
Q378
R384
3
10K
Z
Z375
C379
R385
2.49K
R387
100K
1
Q380
2SC536
.1
COMPRESSOR
D375
R376
C390
1M
1.0
11
-12V
R7
20K
R8
10K
R12
10K
+40V
M
M124
C1
C3
10000
.1
M
R2
14.3K
M125
C4
10000
M
M126
-40V
R3
C5
10K
.1
R4
C6 C12
10K
.1 .1
6543 1
+40V+40V
R388
1K
R389
1K
Q383
2SC536
R398
33.2K
+12V
C380
.1
762
-
+
LF351
4
U375
C381
.1
-12V
Q376
D1
R9
30K
M127
+20V
M
C8
4700
C7 C10
4700 10
M
-20V
M128
R390
75
1/4W
Q384
2SC536
R399
49.9K
Z376
R391
0
R392
2SA608
220
Q385
1/4W
R395
75
1/4W
2SA608
Q386
R396
1K
R386
Z382
4.22K
Z
R397
1K
R377
301
C13
10
C14
10
-40V -40V
STANDBY
MUTE
R5
5.1,1/4W
(FUSIBLE)
2
R6
5.1,1/4W
(FUSIBLE)
C382
.0033
C383
.001
Z
C384
.01
C386
.001
C387
.0033
POWER SUPPLY
D23
1N4148
U1
1
7812
7912
U2
TIP146T
Q381
+40V
D376
+20V
1N5402
10
LEFT CHANNEL
CLASS-G POWER
AMPLIFIER
R180
C176
10
1
Z175
R175
2.49K
C177
1000P
111
D178 D180
100K
R176
10.0K
R177
Z
2.49K
C178
1000P
R178
49.9K
R185
100K
TIP146T
Q382
R374
5.90K
Q387
TIP141T
R393
5.1
1/4W
C378
.1
FILM
M120
M
R394
100K
THESE COMPONENTS NOT USED
M122
M
2
B_OUT
J3
1
J3
M
M121
M
M123
2
L_IN
STANDBY
MUTE
C175
C185
D377
-20V
1N5402
Q388
TIP141T
POWER SUPPLY
FAULT DETECT
Z377
Z
D21D22
BAV99LBAV99L
Z378 Z379
Z Z
D24
1N5235
6.8V
+12V
-12V
6.8V
1N5235
R22
10K
M
M132
R23
10K
+40V
R24
20K
D25
R25
20K
CLASS-G POWER
-40V
C275
R_IN
STANDBY
+12V
MUTE
R275
2.49K
10
Z276
M129
M
3
2
M130
M
1
32
M131
C11
C9
10
.1
M
-12V
.1
1
RIGHT CHANNEL
AMPLIFIER
D275
R280
C285
R278
49.9K
.1
C278
1000P
100K
R276
10.0K
R277
2.49K
R285
100K
C276
10
1
Z
Z275
C277
1000P
1 1
Z
D278 D280
1
+40V
R192
R191
1.0K
10K
2SA608
Q179
R183
1K
Q175
2SC536
R181
1.0K
C179
.01
R184
220
1/4W
+20V
R182
7.50K
D176
1N5235
R179
49.9K
12 7 13
2
NC3 +VS +PWVS
IN-
3
IN+
4
U175
IN+MUTE
9
TDA7294
STBY
10
MUTE
11
NC2
R186
1.0K
-20V
2SA608
Q177
R189
1K
Z176
Z
R190
10K
-40V
-40V
+40V
+40V
R292
10K
R283
1K
Q275
2SC536
+20V
R281
1.0K
R193
220
1/4W
Z
Q180
2SC536
R188
1.0K
R291
1.0K
2SA608
Q279
R284
220
1/4W
R187
7.50K
R282
7.50K
Z177
1N5235
C183
.01
C279
.01
D276
1N5235
D179
R279
49.9K
12 7 13
2
NC3 +VS +PWVS
IN-
3
IN+
4
U275
IN+MUTE
9
STBY
TDA7294
10
MUTE
11
NC2
R286
1.0K
-20V
2SA608
Q277
R289
1K
R290
10K
-40V
-40V
R293
220
1/4W
Q280
2SC536
R288
1.0K
R287
7.50K
1N5235
C283
.01
D279
DWG NO.CLASS
SD 195178
+40V
TIP146T
Q176
D177D175
1N5393
6.8V
C180
.001
+40V
OUT
BTSTRAP
NC1
-VS -PWVSSTBYGND
1581
C182
-40V
.001
6.8V
1N5393
Q178
TIP141T
-40V
+40V
TIP146T
Q276
D277
1N5393
6.8V
C280
.001
+40V
OUT
BTSTRAP
NC1
-VS -PWVSSTBYGND
1581
-40V
C282
.001
6.8V
1N5393
Q278
TIP141T
-40V
+20V
14
22,35V
C181
6
5
-20V
+20V
14
22,35V
C281
6
5
-20V
2345678
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