BOSE 250580 Schematic

8

7

6

5

4

3

2

1

N9A 10K

3 1

LOG
VCA

R23
N/A

N9B 10K

6

LOG
VCA

N9C 10K

3 1

LOG
VCA

SSM2164S

R24
N/A

N9D 10K

6

LOG
VCA

SSM2164S

N12C 10K

6

LOG
VCA

SSM2164S

U33A

SSM2164S

U33C

SSM2164S

U34A

U34C

U35C

81

2
3

R

72

6
5

R

63

9

10

R

54

13
12

R

63

6
5

R

­U25A
+

­U25B
+

­U25C

+

­U25D

+

­U28B
+

C23
330pF

C27
330pF

C31
330pF

C35
330pF

C39
330pF

1

LS404CDT

7

LS404CDT

8

LS404CDT

14

LS404CDT

7

LS404CDT

C82

2.2uF

C84

2.2uF

C86

2.2uF

C88

2.2uF

C90

2.2uF

+

+

+

+

+

R64

30.1K

N74A

30.1K

N24A
470

C54

560pF

N74B

30.1K

N24B
470

C58

560pF

N74C

30.1K

N24C
470

C62

560pF

N74D

30.1K

N24D
470

C66

560pF

B2E_OUT

N25D
470

C70

560pF

N14A
10K

11

10 12

81

81

R

N14B
10K

14

15 13

72

72

R

N14C
10K

11

10 12

63

63

R

N14D
10K

14

15 13

54

54

R

N15C
10K

14

15 13

5 4

R

81

R

LOG
VCA

SSM2164S

72

R

LOG
VCA

SSM2164S

63

R

LOG
VCA

SSM2164S

54

R

LOG
VCA

SSM2164S

63

R

LOG
VCA

SSM2164S

U33B

U33D

U34B

U34D

U35D

C7 33pF

N10A
10K

8 1

2

­U26A

3

+

R

C9 33pF

N10B
10K

7 2

6

­U26B

5

+

R

C11 33pF

N10C
10K

6 3

9

­U26C

10

+

R

C13 33pF

N10D
10K

5 4

13

-

U26D

12

+

R

C15 33pF

N12D

10K

9

-

U28C

10

+

R

C24
330pF

LS404CDT

C28
330pF

LS404CDT

C32
330pF

LS404CDT

C36
330pF

LS404CDT

54

C40
330pF

LS404CDT

1

7

8

14

8

6

3 1

R22
N/A

6

3 1

R25
N/A

3 1

R21
N/A

LOG
VCA

SSM2164S

LOG
VCA

SSM2164S

LOG
VCA

SSM2164S

LOG
VCA

SSM2164S

N5A 10K

LOG
VCA

U31A

SSM2164S

N5B 10K

U31C

N5C 10K

U32A

N5D 10K

U32C

N11C 10K

U35A

81

C21
330pF

2

­U22A

3

+

R

72

C25
330pF

6

­U22B

5

+

R

63

C29
330pF

9

­U22C

10

+

R

54

C33
330pF

13

­U22D

12

+

R

63

C37
330pF

6

­U27B

5

+

R

BAND-PASS FILTERS

C148

0.1uF

N41A

6.34K

N42A

6.34K

6.34K

N44A

6.34K

N45A

6.34K

+5D

D

2
3

2
3

2
3

2
3

2
3

16
15

10

-

U11A

+

-

U12A

+

-

U13A

+

-

U14A

+

-

U15A

+

U61

6
9

7
1

8

AD8801AR

81

1

B1A_CV1 B1A_CV2 B2A_CV1 B2A_CV2

LM324AM

C152

0.1uF
81

1

B1B_CV1 B1B_CV2 B2B_CV1 B2B_CV2

LM324AM

C156

0.1uF
81

1

B1C_CV1 B1C_CV2 B2C_CV1 B2C_CV2

LM324AM

C160

0.1uF
81

1

B1D_CV1 B1D_CV2 B2D_CV1 B2D_CV2

LM324AM

C164

0.1uF
81

1

B1E_CV1 B1E_CV2 B2E_CV1 B2E_CV2

LM324AM

D1A_CV1

2

O1

+V

3

D1A_CV2

O2

RS
SHDN
D
CK
ST

REFH
GND

D2A_CV1

4

O3

D2A_CV2

5

O4

D1B_CV1

11

O5

12

D1B_CV2

O6

13

D2B_CV1

O7

D2B_CV2

14

O8

N61A

23.7K

R65

30.1K

C146

0.1uF
D

N62A

23.7K

N63A

23.7K

N64A

23.7K

N65A

23.7K

81

81

81

81

81

RS
DATA

CLOCK
NABL1

TC2.6V

TC2.6V TC2.6V TC2.6V B1A_CV1 B2A_CV1
D1A_CV1 D1A_CV2 D2A_CV2

TC2.6V TC2.6V TC2.6V
D1B_CV1 D1B_CV2 D2B_CV2

D D

TC2.6V TC2.6V TC2.6V
D1C_CV1 D1C_CV2 D2C_CV2

TC2.6V TC2.6V TC2.6V
D1D_CV1 D1D_CV2 D2D_CV2

TC2.6V TC2.6V TC2.6V
D1E_CV1 D1E_CV2 D2E_CV2

C C

+5D

N61B

23.7K

N62B

23.7K

N63B

23.7K

N64B

23.7K

N65B

23.7K

GENERATE CONTROL VOLTAGES FOR VCA'S

[All CVs range between -0.70V and +2.60V at 25C.]

+5D

U62

16

+V

RS

15

RS

6

SHDN

DATA

10

D

CLOCK

9

CK

NABL2

7

ST

TC2.6V

1

REFH

8

GND

D

AD8801AR

CONTROL DACS

IN1A

IN1

1

1

LS404CDT

8 1

IN2

8 1

N91A
100K

N93A
100K

IN2A

2

­U29A

3

AIN1

+

LS404CDT

R81

1.00M

R

B B

2

­U30A

3

AIN2

+

R82

1.00M

R

R

R

6

-

U29B

5

+

6

-

U30B

5

+

LS404CDT

R41

12.1K

LS404CDT

R43

12.1K

IN1B

7

IN2B

7

R42

12.1K

R31

10.0K

R44

12.1K

R32

10.0K

C16 100pF
8 1

N92A

9

­U29C

10

+

LS404CDT

R

13

­U29D

12

+

LS404CDT

R

C17 100pF
8 1

N94A 100K

9

­U30C

10

+

R

13

­U30D

12

+

R

LS404CDT

100K

8

R46

20.0K

14

8

LS404CDT

R47

20.0K

14

PRIMARY AUDIO PATH

72

72

72

72

72

AOUT1

B1A_IN
B1B_IN
B1C_IN
B1D_IN
B1E_IN

B1_IN

AOUT2

B2A_IN
B2B_IN
B2C_IN
B2D_IN
B2E_IN

B2_IN

N41B

6.34K

N42B

6.34K

N43B

6.34K

N44B

6.34K

N45B

6.34K

O1
O2
O3
O4

O5
O6
O7
O8

C149

0.1uF
72

-

6

7

U11B

+

5

LM324AM
C153

0.1uF
72

-

6

7

U12B

+

5

LM324AM
C157

0.1uF
72N43A

-

6

7

U13B

+

5

LM324AM
C161

0.1uF
72

-

6

7

U14B

+

5

LM324AM
C165

0.1uF

72

-

6

7

U15B

+

5

LM324AM

RS
DATA

CLOCK
NABL3

TC2.6V

+5D

16
15

6

10

9
7

1
8

D

D1C_CV1

2

D1C_CV2

3

D2C_CV1

4
5

D2C_CV2

11

D1D_CV1

12

D1D_CV2

13

D2D_CV1

14

D2D_CV2

TC2.6V
D2A_CV1

TC2.6V
D2B_CV1

TC2.6V
D2C_CV1

TC2.6V
D2D_CV1

TC2.6V
D2E_CV1

U63
+V

RS
SHDN
D
CK
ST

REFH
GND

AD8801AR

N61C

23.7K

N62C

23.7K

N63C

23.7K

N64C

23.7K

N65C

23.7K

2

O1

3

O2

4

O3

5

O4

11

O5

12

O6

13

O7

14

O8

63

63

63

63

63

D1E_CV1
D1E_CV2
D2E_CV1
D2E_CV2

N41C

6.34K

N42C

6.34K

N43C

6.34K

N44C

6.34K

N45C

6.34K

C150

0.1uF
63

-

9

8

U11C

+

10

LM324AM
C154

0.1uF
63

-

9

8

U12C

+

10

LM324AM
C158

0.1uF
63

-

9

8

U13C

+

10

LM324AM
C162

0.1uF
63

-

9

8

U14C

+

10

LM324AM
C166

0.1uF
63

-

9

8

U15C

+

10

LM324AM

N61D

23.7K

N62D

23.7K

N63D

23.7K

N64D

23.7K

N65D

23.7K

54

54

54

54

54

D1A_CV1

D = DAC
B = BAND

CHANNEL #

(1 OR 2)

BAND #

(A-E)

VCA #

(1 OR 2)

KEY TO CV NOMENCLATURE

U41

NJU7306

IN2R38IN1R

IN1B

3

IN1L2IN2L

15

L1

14

L2

13

L3

12

L4

11

L5

10

L6

9

L7

8

L8

7

L9

6

L10

5

L11

26

R1

27

R2

28

R3

29

R4

30

R5

31

R6

32

R7

33

R8

34

R9

35

R10

36

R11

39

IN2B

IN/OUT GAIN TABLE

24.9K 50.0K 100.K Max In
===== ===== ===== ======
0 0 0 -1.4dBV
0 0 1 4.6dBV
0 1 0 8.1dBV
0 1 1 10.6dBV
1 0 0 12.6dBV
1 0 1 14.1dBV
1 1 0 15.5dBV
1 1 1 16.6dBV

B1_IN

N91D

IN1A

N91C
N91B
R51

AOUT1

R52
N92D
N92C
N92B

N93D

IN2A

N93C
N93B
R53

AOUT2

R54
N94D
N94C
N94B

B2_IN

IN/OUT GAIN

DATA
CLOCK
NABL5

IN1A

Output
GAIN
======

18.4dB

12.4dB

8.9dB

6.4dB

4.4dB

2.9dB

1.5dB

0.4dB

U51

100K

54

100K

63

100K

72

24.9K

24.9K
100K

54

100K

63

100K

72

100K

54

100K

63

100K

72

24.9K

24.9K
100K

54

100K

63

100K

72

2
3
4
6
7

8
10
11

29
28
27
25
24
23
21
20

17

D

16

CK

14

ST+V-V

13
18

NJU7312AM

GND

5

IN1

9

IN1B

12

PK1

26

IN2

22

IN2B

19

PK2

30

+15

1

-15

15

D

DATA
CLOCK
NABL4

+15

+5D

-15

40

NC1

37

NC2

25

NC3

19

NC4

4

NC5

17

NC6

16

NC7

22

DI

23

CLK

20

CS

1

VDD

21

VCC

18

VEE

24

VSS

D

IN2A

BAND BOOST/CUT CONTROL

C151

0.1uF

N41D

54

6.34K

-

13

U11D

+

12

LM324AM

C155

0.1uF

N42D

54

6.34K

-

13

U12D

+

12

LM324AM

C159

0.1uF

N43D

54

6.34K

-

13

U13D

+

12

LM324AM

C163

0.1uF

N44D

54

6.34K

-

13

U14D

+

12

LM324AM

C167

0.1uF

N45D

54

6.34K

-

13

U15D

+

12

LM324AM

81

N31A 1.82K

81

N81A 51.0K

72

N31B 1.82K

72

N81B 51.0K

63

N31C 1.82K

63

N81C 51.0K

54

N31D 1.82K

54

N81D 51.0K
R11 1.82K
R71 51.1K

72

N15B 10K

81

N32A 1.82K

81

N82A 51.0K

72

N32B 1.82K

72

N82B 51.0K

63

N32C 1.82K

63

N82C 51.0K

54

N32D 1.82K

54

N82D 51.0K
R12 1.82K
R72 51.1K

54

N15D 10K

14

14

14

14

14

B1A_OUT

B1B_OUT

B1C_OUT

B1D_OUT

B1E_OUT

B2A_OUT

B2B_OUT

B2C_OUT

B2D_OUT

B2E_OUT

N4A
10K

81

LS404CDT

N4B
10K

LS404CDT

N4C
10K

LS404CDT

N4D
10K

LS404CDT

10K

LS404CDT

N71A

30.1K
2 4

81

N21A
470

81

C51

560pF

R

+15

B1B_CV1 B2B_CV1

N71B

30.1K

72

7 5

N21B
470

72

C55

560pF

R

B1C_CV1 B2C_CV1

N71C

30.1K

63

2 4

N21C
470

63

C59

560pF

R

+15 +15

B1D_CV1 B2D_CV1

N71D

30.1K

54

7 5

N21D
470

54

C63

560pF

R

B1E_CV1 B2E_CV1

R61

2 4

8 1

N25A
470

C67

560pF

R R

+15

72

63

54

72

1

LPF@
605KHz

7

LPF@
605KHz

8

LPF@
605KHz

14

LPF@
605KHz

1

LPF@
605KHz

30.1K

2

N3A
10K

B1A_IN B2A_IN

N3B
10K

B1B_IN

N3C
10K

B1C_IN B2C_IN

N3D
10K

B1D_IN B2D_IN

N11A

10K

R

R

B1E_IN B2E_IN

­U21A

81

3

+

6

­U21B

72

5

+

9

­U21C

63

10

+

13

­U21D

54

12

+

N11B

2

-

U27A

81

3

+

B1A_OUT B2A_OUT

+

C81

2.2uF

B1A_CV2 B2A_CV2

N72A

30.1K

1

LS404CDT

N22A
470

C52

560pF

B1B_OUT B2B_OUT

+

C83

2.2uF

B1B_CV2 B2B_CV2

N72B

30.1K

7

LS404CDT

N22B
470

C56

560pF

B1C_OUT B2C_OUT

+

C85

2.2uF

B1C_CV2 B2C_CV2

N72C

30.1K

8

LS404CDT

N22C
470

C60

560pF

B1D_OUT B2D_OUT

+

C87

2.2uF

B1D_CV2 B2D_CV2

N72D

30.1K

14

LS404CDT

N22D
470

C64

560pF

B1E_OUT

+

C89

2.2uF

B1E_CV2 B2E_CV2

R62

30.1K

7

LS404CDT

N25B
470

C68

560pF

N13A
10K

11

81

10 12

81

R

N13B
10K

14

72

15 13

72

R

N13C
10K

11

63

10 12

63

R

N13D
10K

14

54

15 13

54

R

N15A
10K

11

10 12

7 2

R

13
12

81

LOG
VCA

SSM2164S

72

LOG
VCA

63

LOG
VCA

SSM2164S

54

LOG
VCA

SSM2164S

81

LOG
VCA

SSM2164S

­U27D
+

R

U31B

R

U31D

SSM2164S

R

U32B

R

U32D

R

U35B

14

LS404CDT

C6 33pF

N6A
10K

8 1

2

­U23A

3

+

R

C8 33pF

N6B
10K

7 2

6

­U23B

5

+

R

C10 33pF

N6C
10K

6 3

9

-

U23C

10

+

R

C12 33pF

N6D

10K

5 4

13

­U23D

12

+

R

C14 33pF

N11D

10K

9

­U27C

10

+

R

C22
330pF

LS404CDT

C26
330pF

LS404CDT

C30
330pF

LS404CDT

C34
330pF

LS404CDT

54

C38
330pF

LS404CDT

N8A
10K

81

LS404CDT

N8B
10K

LS404CDT

N8C
10K

LS404CDT

10K

LS404CDT

10K

LS404CDT

72

63

54

72

1

LPF@
605KHz

7

LPF@
605KHz

8

LPF@
605KHz

14

LPF@
605KHz

1

LPF@
605KHz

30.1K

R63

N73A

30.1K

C53

560pF

N73B

30.1K

C57

560pF

N73C

30.1K

C61

560pF

N73D

30.1K

C65

560pF

N25C
470

C69

560pF

N23A
470

N23B
470

N23C
470

N23D
470

81

R

72

R

63

R

54

R

2 4

81

+15

7 5

72

2 4

63

7 5

54

7 5

6 3

2

N7A

B2B_IN

10K

N7B
10K

N7C
10K

N7D

10K

N12A

10K

13

­U28D

12

+

RR

1

7

8

14

8

81

72

63

54

81

14

LS404CDT

­U24A

3

+

6

­U24B

5

+

9

­U24C

10

+

N8D

13

­U24D

12

+

N12B

2

­U28A

3

+

C125

0.1uF

C126

0.1uF

R

U11 - U15

C127

0.1uF

C128

0.1uF

C129

0.1uF

C130

0.1uF

C131

0.1uF

C132

0.1uF

+5D

U4
C133

0.1uF

D

TM

U61
U62 U63
C134

0.1uF

C135

0.1uF

U71
U72 U82
C136

0.1uF

SERVICE MANUAL PART NUMBER 256689

5-BAND PARAMETRIC EQ MODULE

PART NUMBER 250580

SHEET 1 OF 1

1

U81

C137

0.1uF

U91
C138

0.1uF

J1

CLOCK

1

DATA

2
3
4
5

+5D

6

+15

7

+5A

8

-5A

9

-15

10

D

CON10

A A

CONNECTORS

+5D

DATA
ENBAR

R

U91

10

SER

11

A

12

B

13

C

14

D

3

E

4

F

5

G

6

H

2

CLK

15

INH

1

SH/LD

74HC165
CODE = 043 HEX

VCC

GND

J2

AIN1

1

AIN2ENABLE

2

IDSELECT

3

AOUT1

4

AOUT2

5

PEAK1

6

PEAK2

7
8

R

CON8

G55C1 ID INFO:

+5D

NOLOAD=2.320V

16

LOADED=2.155V
CODE=1B9 HEX

+5A

R98

9

QH

7

QH

8

D

N/A

R99
N/A

R

ID

8

+5A

TEMPERATURE SENSOR
10mV PER DEGREE (C)

ID

TEMPERATURE-COMPENSATED
REFERENCE VOLTAGE

R1
909

U5

LM4040

U6 LM50CIM3

3

1

R

+5A

4.1V

REF

3

21

R

NJM3414A

2

­U4A

3

2

+

R95

21.00K

1

R94

11.50K

R92

10.00K

7

NJM3414A

5

U4B

6

+

-

R91

7.500K

R93

10.00K

7

TC2.6V

C147

0.1uF

RR

D5
SELECT

+5D

ENABLE

+5D

SELECT

ENBAR
SELBAR

DATA

Q1
Q2
Q3
Q4
Q5

CLOCK

3
4

6
11
13
14

9

1

1

U71A

2

74HC00

4

U71B

5

74HC00

9

U71C

10

74HC00

12

U71D

13

74HC00

6

U81
D1

D2
D3
D4
D5
D6

CLK
CLR

74HC174

Q1

3

2

Q1

Q2

5

Q2
Q3
Q4
Q5
Q6

3

NABL5

6

ENBAR

8

SELBAR

11

NABL0

4

Q3

6

7

Q4

10

11

Q5

13

12

Q6

15

14

9

NABL0

1

+5D+5D

D1

SELECT

D2

D3

D4

ENABLE LOGIC

U82
D1

D2
D3
D4
D5
D6

CLK
CLR

74HC174

1

U72A

2

74HC00

4

U72B

5

74HC00

9

U72C

10

74HC00

12

U72D

13

74HC00

U31 U33

D1

2

Q1

5

D2

Q2

D3

7

Q3

D4

10

Q4

12

D5

Q5

15

Q6

3

NABL1

6

NABL2

8

NABL3

11

NABL4

PK1

PK2

54

N1D
10K

N1C
N1A
10K

N1B
10K

N2A
10K

N2B
10K

N2D
10K

63

10K

2

81

­1

U1A

72

3

+

TL074

N2C

63

10K

6

81

­7

U1B

5

72

+

TL074

54

C1

D1

16pF

13

­14

U1D

12

+

TL074

R

C2

16pF

9

­8

U1C

10

+

TL074

R

2

-

31

U2A

3

+

TL072

D3

6

-

31

U2B

5

+

TL072

PEAK1

D2

1

C101

31

0.1uF

D

PEAK2

D4

7

C102

31

0.1uF

D

U1

+15

U2 U32
C103

C107

C105

0.1uF

0.1uF

0.1uF

C104

C108

C106

D

0.1uF

0.1uF

0.1uF

-15

NOTES

1. U11-15 use +5A and -5A rails.

2. U4 uses +5A and DGND rails.

3. All other op amps use +15 and -15 rails.

U21 U25 U27

U35

C111

C109

0.1uF

0.1uF

C110

C112

0.1uF

0.1uF

U23

C113

0.1uF

C114

0.1uF

C115

0.1uF

C116

0.1uF

C117

0.1uF

C118

0.1uF

U29

C119

0.1uF

C120

0.1uF

U51

U41U34 U22 U24 U26 U28 U30
C121

C123

0.1uF

0.1uF

C122

C124

0.1uF

0.1uF

DECOUPLING

+5A

D

-5A

BOSE ENTERO SE 16 AUDIO PROCESSOR

PEAK DETECTORS

5

4

3

2