BOSE SD187923 2 06 Schematic
C
B
A
DYNEQ1
EQGND
DYNEQ2
8
C335
0.22
R370
M39
R301
2.43K
R303
100K
R334
OPT
M38
R362
CH.2
BASS BOOST
ADJUST
(50-150HZ)
4.99K
C318
OPT
R336
OPT
OPT
10.0K
9
U300
10
C360
1/50V
R310
TP73Z
9
10
DYNAMIC EQ LEVEL DETECTOR
M137
R391
0
3
R4
20K
2
1
CH.1
BASS BOOST
ADJUST
(50-150HZ)
R392
OPT
-12V
R300
TP54
47.5K
Z
R302
TP53 Z
100K
R304
D300
MMBD914
10.0K
1
R309
R389
OPT
OPT
1
R332
OPT
-12V
R331
TP72Z
OPT
TP71
R333
Z
OPT
D306
R335
OPT
MMBD914
OPT
1
3
R5
OPT
2
1
7
HIGH PASS FILTER(150HZ)
R368
OPT
TP51 Z
C340
C334
0.22
0.22
TP55Z
4
8
NJM2059
11
DYNAMIC EQ LEVEL DETECTOR
4
U301
NJM2059
11
OPT
M138
C339
OPT
C349
OPT
R371
4.99K
TP56 Z
TP81 Z
TP80
8
TP57
M131
M133
R372
10.0K
Z
M132
C302
10/35V
Z
D305
BAV70L
OPT
M134
C319
OPT
R364
OPT
D301
BAV70L
C338
OPT
+12V
2
3
D304
BAV99L
OPT
U306
-12V
D302
BAV99L
R305
1M
R339
OPT
8
4
R369
C337
NJM4559
C341
0.1
C303
10/35V
C320
OPT
R365
OPT
TS21
0
0.1
1
Q300
MMBT3904
R306
20K
Q304
MMBT3904
OPT
R338
OPT
R386
OPT
F
M48
R373
4.99K
M41
Q301
MMBT3906
TP58Z
-12V
M40
TP84
Q305
MMBT3906
OPT
R337
OPT
TP82Z
-12V
R366
OPT
C336
OPT
BANDPASS FILTER (50-150HZ)
R307
20K
TP59
TP60
Z
Z
Z
M135
TP62 Z
TP83Z
R367
OPT
R390
OPT
S4
HPF OUT
HPF IN
M136
C342
0.15
C348
OPT
Q302
MMBT3906
R308
5.62K
R311
10.0K
TP61
Z
R313
10.0K
Q306
MMBT3906
OPT
R340
OPT
R341
OPT
TP85Z
6543 1
(FOR MODEL 1B/70V SYSTEMS)
C343
R378
40.2K
0.12
R377
R376
30.1K
30.1K
BANDPASS FILTER (50-150HZ)
TP63Z
DYNAMIC EQ VCA
-12V
C304
0.1
4
3
R312
U302
2
R342
OPT
TP86 Z
R343
OPT
1.0K
C346
OPT
+12V
R363
OPT
TP94
C305
0.1
C321
OPT
C322
OPT
Z
CA3080E
7
+12V
R330
10.0K
R357
47.5K
DYNAMIC EQ VCA
-12V
TP87
Z
4
3
5
U303
2
CA3080E
7
OPT
+12V
R387
OPT
6
U301
5
5
6
4
NJM2059
11
TP64
6
OPT
Z
4.7/35V
TP88Z
TP89 Z
TP98
7
C333
R344
OPT
C344
.033
R314
8.25K
TP65
TS27
R379
14.0K
Z
F
Z
R316
4.99K
C323
OPT
M49
R381
4.02K
R374
26.7K
C306
OPT
55 HZ BANDPASS FILTER
(THIS FILTER ENGAGED WHEN
BEDROCK EQ. IS INSTALLED.)
M46
R380
30.1K
TP52Z
4
6
U300
5
NJM2059
11
C345
.033
C307
1.8nF
R315
301K
4
13
14
U300
12
NJM2059
11
TP66Z
C324
OPT
R346
OPT
4
13
14
U301
12
NJM2059
11
OPT
TP90Z
R345
OPT
55 HZ BANDPASS FILTER
(THIS FILTER ENGAGED WHEN
BEDROCK EQ. IS INSTALLED.)
R384
OPT
R382
6.19K
TS22
F
7
M47
R393
OPT
90 HZ BANDPASS FILTER
(THIS FILTER IS ALWAYS ENGAGED,
EXCEPT WHEN MODEL 1B EQ. IS INSTALLED.)
M43
R318
C308
100K
10/35V
R317
100K
C311
0.1
90 HZ BANDPASS FILTER
(THIS FILTER IS ALWAYS ENGAGED,
EXCEPT WHEN MODEL 1B EQ. IS INSTALLED.)
M42
C325
R347
OPT
OPT
R348
OPT
C326
OPT
TP95Z
C312
0.15
C328
OPT
C310
0.15
C327
OPT
C309
.068
R320
26.7K
C329
R349
OPT
M148
R414
10
1W
M169
M54
J403
J6
M55
C408
0.1
J405
OPT
M102
M101
M99 M100
4321
1234
M151
M53
TP70 Z
C315
47pF
R327
R325
R385
26.7K
R352
OPT
NJM2120
2
3
7
6
C313
R322
6.81K
2
3
7
6
R355
OPT
6
U306
5
+INA
-INA
+INB
-INB
+INA
-INA
+INB
-INB
C331
TP96Z
14.0K
6.49K
8
4
R324
C314
0.1
8
VCC
VEE
4
0.1
R353
OPT
C330
OPT
8
VCC
VEE
4
OPT
NJM4559
SPARE
OPT
+12V
U304
OUT
SW
-12V
+12V
U305
OUT
SW
NJM2120
-12V
7
R326
2.00K
TS23
F
TS25
F
M45
R358
OPT
5
1
OPT
M44
5
1
R323
4.22K
TP68 Z
R319
25.5K
TP67 Z
R321
4.64K
R351
OPT
TP92 Z
OPT
R350
OPT
TP91 Z
R354
OPT
R356
OPT
TP69
6.19K
+12V
R388
OPT
C347
0.1
4
2
U300
3
NJM2059
11
C301
0.1
-12V
C332
OPT
R359
OPT
+12V
4
2
U301
3
NJM2059
11
-12V
C316
OPT
OPT
C317
TS24
F
1
M51
R328
0
R329
OPT
M172
M52
C409
OPT
TS26
F
1
M50
R360
OPT
OPT
R383
OPT
TP93 Z
R415
OPT
J404
M88
M104
M87
M103
POWER AMPLIFIER OUTPUTS
CH1(-)
CH1(+)
Z
M143
M147
R700
100K
R701
OPT
S6
AMP MODE SWITCH
2
M58
CV
4
6
4 OHM
70V/100V (+)
70V/100V (-)
C700
+40V
10/35V
4 OHM
S6
TP118 Z
CV
1
3
5
2
M142
M146
M150M149
TP130
Z
R714
R715
20.0K
R703
20.0K
R716
0.1
OPT
C701
20.0K
R717
20.0K
Z
TP120
2
3
TP113Z
R704
1.0M
R702
+12V
20.0K
R710
30.1K
TP116 Z
-12V
J406
J407
M56
OPT
M59
G5
D703 BAV99L
M57
M156M155
LEVELER1
1
M77
+40V
M140
M141
M81
+20V
-20V
M82
-40V
+12V
-12V
8
U700
NJM4559
4
MMBD914
D700
R707
OPT
M161 M162
M170
J409
100V CONSTANT
M144
M145
M78
M152
M83
M153
M84
-40V
TP125 Z
+12V
TP117Z
R705
1
+12V
8
2
U701
3
1
4
-12V
-40V
+12V
-12V
J410
10K
C705
0.1
7
NJM311
65
C706
0.1
+20V
-20V
M167 M168
M171
3
2
1
6
5
-12V
+12V
Z
TP123
+40V
M164 M163
M166M165
M173M174
M176M175
J400
188600
120V JUMPER230V JUMPER
CONFIGURATIONCONFIGURATION
J409
70V CONSTANT
VOLTAGE OUTPUTVOLTAGE OUTPUT
FRAMINGHAM, MA 01701-9168
AmPlus 50 Amplifier
M154
10.0K
100pF
8
U700
4
R708
10.0K
R711
1.0K
M157 M158
M160M159
M63
R706
C704
C702
0.1
7
NJM4559
C703
0.1
TP124
TP127 Z
MMBT3904
M64
M177
J410
TM
J7B
1
2
3
4
5
6
7
8
9
10
11
12
CLIP/SC1
MMBD914
Z
Q701
J8B
1
2
3
4
5
6
7
8
9
10
11
12
J401
D702
1
CONNECTS TO J7A
CHANNEL 1
POWER AMPLIFIER
SHT.3
1
DC OFFSET DETECT
MMBD914
RELAY LATCH-UP
R713
1.0K
LEVELER2
OPT
CLIP/SC2
1
1
70V Out
2
100V Out
3
4
TP126Z
D701
DD
TP112Z
TP128
Z
R709
RELAY
3
10.0K
MMBT3906
-12V
Q700
R712
20.0K
C707
4.7/35V
TP129Z
C
B
M60
M97
M61
J409
J410
100V
70V
M62
M98
R
A
PCB 187923-001, 2
Service Manual P/N: 194101 Rev. 00
2345678
Rev. 5 Sheet 2 of 3
1
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