BOSE 250568 Schematic

8

CV1

R27

5.62K

C98
OPT

D D

LPF@

D D

IN1

450Hz

R25

4.99K

+15

7 4

5

U8

+

6

3080

-

R31

8.25K

-15

C21

.0015

R76
301K

2

-

U5A

3

+

2059

R39

10.0K

3

2

R1

1.00K

R33

10.0K

R

1

C91

DYNAMIC EQ VCA

CV2 DATA

R28

5.62K

C99
OPT

D D

LPF@

450Hz

IN2

DYNAMIC EQ VCA BANDPASS FILTER

C C

DETECT1 LEVEL1 Q4 Q5

DETECT2 LEVEL2 D2

B B

EQ LEVEL (FOR MONITORING)

AIN1

AIN2

R26

4.99K

R6

1.50K

R7

1.50K

R8

1.50K

R9

1.50K

2

­U2A

3

+

R81

TL074

1.00M

R

6

­U2B

5

+

TL074

R82

1.00M

AUDIO

R

INPUT

BUFFERS

A A

CLOCK

1

DATA

2

ENABLE AIN1

3

CH_SEL AIN2

4

+5D

5

+15

6

+5A

7

-5A

8

-15

9

10

J1

D R

CON10

CONNECTORS DECOUPLING

+15

7 4

5

U9

+

6

3080

-

R32

8.25K

-15

C22

.0015

R77
301K

2

-

U6A

3

+

2059

2

R35

10.0K

3

C62

0.1

D D

6

R36

10.0K

5

C63

0.1

D D

SW_IN2

1

BIN1

SW_IN1

7

BIN2 CLOCK

R40

10.0K

3

2

R2

1.00K

R34

10.0K

R

1

­U7A

+

2059

­U7B

+

2059

C92

8 1

1

N5A
10K

6 3

7

N5C
10K

N6A

10K

81

72

N6B
10K

N6C

10K

63

54

N6D

10K

STEREO

COUPLING

G61A1 ID INFO:

NOLOAD=2.856V

+5A

R

LOADED=2.667V

CODE=222 HEX

R98

27.40K

R99

36.50K

ID

1

2

ID

3

AOUT1

4

AOUT2

5

PEAK1 ID

6

PEAK2

7

8

J2
CON8

8

7

R1B_OUT R1B_IN PEAK1

R1A_IN R1A_OUT

R1C_IN AOUT1 AOUT1 SW1A

C31

.047

R1C_OUT

R R

10

+

BANDPASS FILTER

R2B_OUT R2B_IN

R2A_IN R2A_OUT

R2C_IN AOUT2

C33

.047

R2C_OUT

R R

10

+

C64

0.1

72

N5B

10K

13

-

14

U7D

12

+

2059

R

C65

0.1

54

N5D

10K

9

-

8

U7C

10

+

2059

R

13

­U2D

12

+

TL074

9

­U2C

10

+

TL074

C81

2.2

14

+

IN1

DATA

VCLK

NABL4

8

+

C82

IN2

2.2

+15

D

-15

7

R56

22.1K

R61

33.2K

R48

17.4K

R45

13.0K

R66

64.9K

R R

U21

4

13

12

14

21

LD1A5LD1B6LD2A20LD2B

IN1

DATA

CLOCK

STROBE

IN2

D R

LOUDNESS THRESHOLDS

U1 U2

U5U8U6

U3

C43

0.1

C44

0.1

U9 U7

U21

C49

C47

C45

0.1

0.1

0.1

C50

C48

C46

0.1

0.1

0.1

6

N3A
10K

8 1

C32

.047

+

5

2059

U5B

-

6

R

BIN1

7

R51

20.0K

R52

20.0K

R

R29

8.25K

5

C11

47pF

72

N3B

10K

9

-

8

U5C

10

+

2059

R

NON-INVERTING

N3C

6 3

10K

4

C13

47pF

54

N3D

10K

13

-

14

U5D

12

+

2059

EQ SUMMATION

N4A
10K

8 1

C34

.047

+

5

2059

U6B

-

6

R

BIN2

7

R53

20.0K

R54

20.0K

R

R30

8.25K

NON-INVERTING

C12

47pF

72

N4B

10K

9

­U6C

10

+

2059

R

N4C

6 3

8

10K

C14

47pF

54

N4D

10K

13

-

14

U6D

12

+

2059

EQ SUMMATION

2

3

4

6

7

8

10

R11

1.82K

R15

3.01K

R17

3.01K

R21

4.12K

R1C_OUT R2C_OUT

R58

28.0K

R1B_OUT R2B_OUT

R1A_OUT R2A_OUT D4

TC9412AF

RGND

DGND9DGND11DGND16RGND

7

18

24

+15 -15

U4

U31 U41 U42 U43

U32 U33

C53

C51

C55

0.1

0.1

0.1

C54

C52

C56

0.1

0.1

0.1

6

R41

13.0K

R13

2.21K

R43

13.0K

R19

3.01K

R68

68.1K

19

3

OUT1

-151+15

23

+5D

C57

0.1

D

+5D

NC2NC8NC10NC15NC17NC

R

C58

0.1

U51 U52

C60

0.1

22

OUT2

C59

0.1

C61

0.1

11

29

28

27

25

24

23

21

20

17

DATA DATA

16

CLOCK CLOCK D1

14

NABL1 NABL2 NABL1

13

18

BANDPASS FILTER

CUTOFF FREQUENCY

SELECTION SWITCHES

+

8 1

C83

N11A

2.2
100K

R

+

8 1

C84

N12A

2.2
100K

R

5

D

CK

ST+V-V

GND

U31
NJU7312M

1.00K

R

1.00K

R

40dB GAIN

5

9

R1C_IN R2C_IN

12

26

R1B_IN R2B_IN Q5

22

19

R1A_IN R2A_IN

30

1

-15 -15

15

D D

R3

2

-

U4A

3

+

2059

R4

6

-

U4B

5

+

2059

R57

22.1K

R62

33.2K

R49

17.4K

R46

13.0K

R67

64.9K

-15

R63

47.5K

N11B

100K

N12B

100K

D5

FMMD914

72

R64

47.5K

FMMD914

R

D6

R

1

-15

72

7

LEVEL DETECTORS

4

SW1A

SW2A

3

N1C
10K

N1A
10K

81

72

N1B
10K

N2A
10K

81

72

N2B
10K

63

2

2

­U1A

3

+

TL074

C1

16pF

13

­U1D

12

+

TL074

R

N2C
10K

63

6

­U1B

5

+

TL074

C2

16pF

9

­U1C

10

+

TL074

R

­U3A

3

1

+

D1

14

31

6

­U3B

5

7

+

TL072

D3

8

31

TL072

C41

D2

0.1

1

31

D

C42

D4

0.1

7

31

D

2

LEVEL1

AOUT2 SW2A

LEVEL2

BIN1 SW_IN1

BIN2 SW_IN2

PEAK2 CLOCK

NABL3

2

3

4

6

7

8

10

11

29

28

27

25

24

23

21

20

17

16

14

13

18

D

CK

ST+V-V

U33
NJU7312M

1

5

9

12

26

22

19

30

1

15

GND

D

R

+15

-15

MISCELLANEOUS

PEAK DETECTORS

2

3

4

6

7

8

10

D21 BAV99

D11

BAV70

C93

10

D22 BAV99

D12

BAV70

C94

10

11

29

28

27

25

24

23

21

20

17

16

14

13

18

32

1

+

C95

D

Q11
3904

+

20.0K

DD

32

1

+

C96

D

Q12
3904

+

20.0K

DD

R12

1.82K

R16

3.01K

R18

3.01K

R22

4.12K

R59

28.0K

5 4

63

N11D

N11C

100K

100K

R37

10.0K

31

R

R91

2.00K

5 4

63

N12D

N12C

100K

100K

R38

10.0K

31

R

R92

2.00K

R42

13.0K

R14

2.21K

R44

13.0K

R20

3.01K

R69

68.1K

DETECT1

13

-

14

1

U4D

12

+

C85

2.2

+

C86

2.2

DETECT2

9

10

+

2059

-

U4C

+

2059

1.00M

1.00M

32

R83

8

1

32

R84

3

D

CK

ST+V-V

U32
NJU7312M

10

R93

D

10

R95

D

5

9

12

26

22

19

30

+15+15

1

15

GND

Q23

3906

Q21
3906

20.0K

Q24

3906

Q22
3906

20.0K

CV1

R94

-15

CV2

R96

-15

NO 20K!

DATA Q1 D1

CLOCK NABL0

ENABLE NABL0

CH_SEL

NABL4

BOSE ENTERO SE 16 AUDIO PROCESSOR

2

SWITCHES

U51

3

4

Q1 Q2 D2

6

Q2 Q3 D3

Q3 Q4 D4

11

13

14

9

1

+5D +5D

+5D

+5D

10

1

2

+5D

12

+5D

13

+5D

74HC174

CH_SEL

4

5

9

U43A

74HC00

U43D

74HC00

D1

D2

D3

D4

D5

D6

CLK

CLR

U42B

74HC00

U42C

74HC00

2

Q1

5

Q2

7

Q3

10

Q4

12

Q5

15

Q6

1

U41A

2

74HC00

4

U41B

5

74HC00

9

D3

U41C

10

74HC00

12

U41D

13

74HC00

6

8

3

11

U52

3

4

6

11

13

14

Q6

9

1

3

6

8

11

12

U42D

13

74HC00

+5D

+5D

9

U43C

10

74HC00

D1

D2

D3

D4

D5

D6

CLK

CLR

74HC174

1

2

4

5

NABL2

NABL3

NABL4

U42A

74HC00

U43B

74HC00

2

Q1

5

Q2

7

Q3

10

Q4

12

Q5

15

Q6

11

8

VCLK

ENABLE LOGIC

R

SERVICE MANUAL PART NUMBER 256689

TM

DYNAMIC EQ MODULE

PART NUMBER 250568

SHEET 1 OF 1

1

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