BOSE 250569 Schematic
8
7
6
5
4
3
2
1
EQ_IN
From J2-1
BPF1_OUT BPF1_OUT
BPF2_OUT BPF2_OUT
BPF3_OUT BPF3_OUT
D D
BPF4_OUT BPF4_OUT
BPF5_OUT BPF5_OUT
BPF6_OUT BPF6_OUT
BPF7_OUT BPF7_OUT
BPF8_OUT BPF8_OUT
R11
10.0K
R21
20.5K
R22
N/A
R23
N/A
R24
5.49K
R25
N/A
R26
N/A
R27
N/A
R28
N/A
R12
10.0K
6
_
5
+
R R
U3B
7
LS404
CUT BOOST
R14
R13
10.0K
10.0K
13
_
12
+
R
U3D
LS404
14
BPF_IN
INVERT
BAND-PASS FILTER SUMMATION
C C
R41
BPF_IN BPF_IN
BPF_IN BPF_IN
From U3-14
B B
BPF_IN BPF_IN
From U3-14
BPF_IN BPF_IN
A A
From U3-14 From U3-14
27.4K
R42
6.19K
R43
255K
R44
10.5K
R51
14.3K
R52
2.26K
R53
665K
R54
27.4K
C11
2700pF
C12
2700pF
C13
2700pF
C14
2700pF
R R
C15
.010uF
C16
.047uF
C17
.010uF
C18
.047uF
R R
R61
54.9K
R45
2
_
3
+
LS404
R
R62
12.4K
6
_
5
+
LS404
R
R63
309K
9
_
10
+
LS404
R
R64
12.7K
13
_
12
+
LS404
R
U4A
U4B
U4C
U4D
1
7
8
14
BPF1_OUT BPF5_OUT
Q=1.21
Fc=2602Hz
Gain=-3.5dB
BPF2_OUT BPF6_OUT
Q=1.37
Fc=12979Hz
Gain=+9.0dB
BPF3_OUT
Q=0.50
Fc=30Hz
Gain=+3.9dB
BPF4_OUT BPF8_OUT
Q=0.50
Fc=732Hz
Gain=-9.0dB
From U3-14From U3-14
From U3-14
From U3-14
N/A
R46
N/A
R47
N/A
R48
N/A
R55
N/A
R56
N/A
R57
N/A
R58
N/A
BAND-PASS FILTERS
R15
10.0K
R31
N/A
R32
5.49K
R33
17.8K
R34
N/A
R35
N/A
R36
N/A
R37
N/A
R38
N/A
C19
N/A
C20
N/A
R
RR
C21
N/A
C22
N/A
R
C23
N/A
C24
N/A
R
RR
C25
N/A
C26
N/A
R
R16
R65
N/A
10.0K
9
_
10
+
U3C
LS404
8
EQ_OUT
To J2-2
HPF
C71
.100uF
.100uF
.047uF
C72
.033uF
R71
30.9K
C74
C75
.033uF
R74
8.06K
R R
C77
C78
.047uF
R77
19.6K
R72
20.5K
C73
.033uF
R75
9.09K
C76
.033uF
C79
.047uF
R78
7.50K
6
_
7
8
14
HPF1
802FR
HPF2
802/502B
HPF3
802/AWCS
U1B
5
+
LS404
R73
499K
RR
9
_
U1C
10
+
LS404
R76
158K
13
_
U1D
12
+
LS404
R79
133K
RR
C's are
LPF
R81
N/A
R
R84
N/A
R87
N/A
R R
1210/1206
2
_
3
+
N/A
R66
N/A
6
_
5
+
N/A
R67
N/A
9
_
10
+
N/A
R68
N/A
13
_
12
+
N/A
U5A
U5B
U5C
U5D
1
7
8
BPF7_OUT
HIGH-PASS FILTERS LOW-PASS FILTERS
HPF_IN
2
_
3
+
U1A
LS404
1
HPF
LPF_IN
2
_
3
+
U2A
N/A
1
LPF
2
_
3
+
R
U3A
1
LS404
BUFFERS
HPF_IN
1
HPF1
2
HPF2
3
HPF3
4
LPF_IN
5
LPF1
6
LPF2
7
LPF3
8
J1
EQ_IN
1
EQ_OUT
2
ID
3
4
5
+5A
6
+15
7
8
-15 R
9
J2
R95
49.9K
D
G71B01 ID INFO:
NOLOAD=1.362V
LOADED=1.249V
CODE=100 HEX
+5A
R98
73.20K
0805
ID
R99
27.40K
0805
R
CONNECTORS
PREFERRED
JP1
0603
HPF_IN HPF1
Use a 0-ohm jumper here
14
only if there are no HPFs.
Use a 0-ohm jumper here
only if there are no LPFs.
N/A
JP2
0603
0-ohm
LPF1LPF_IN
FILTER BYPASS
____________________CAPACITOR VALUES
NPO 100pF
NPO 330pF
NPO 1000pF
NPO 2200pF
NPO 5600pF
PPS .010uF
PPS .018uF
PPS .047uF
PPS .100uF
BOSE ENTERO SE 16 AUDIO PROCESSOR
R
SERVICE MANUAL PART NUMBER 256689
LOUDSPEAKER EQ MODULE
PART NUMBER 250569-1,-2,-3,-6,-7,-9
C82 N/A
R82
N/A
R83
N/A
C85 N/A
R86
N/A
C88 N/A
R89
N/A
PCB1 PT195569AA
LABEL1 LASER LABEL
SNAP1 SPACER
R85
N/A
R88
N/A
C81
N/A
C84
N/A
C87
N/A
MISC.PARTS
+15
D
-15
DECOUPLINGID
CAPACITANCE RANGES
TYPE SIZE VALUE____ ____ _____
NPO 0805 <=2.4nF
NPO 1206 <=6.2nF
NPO 1210 <=7.9nF
PPS 0805 <=10nF
PPS 1206 <=47nF
PPS 1210 <=100nF
TM
6
_
U2B
5
+
C83
N/A
R
9
_
U2C
10
+
C86
N/A
RR
13
_
U2D
12
+
C89
N/A
U2
C91
C93
0.1uF
N/A
C92
C94
0.1uF
N/A
0.1uF are 0805
7
N/A
8
N/A
14
N/A
C's are
1206/0805
U3U1 U4 U5
C97
C95
0.1uF
0.1uF
C96
C98
0.1uF
0.1uF
R's are 0603
C's are 1206/0805
Unless noted
LPF1
LPF2
LPF3
C99
0.1uF
C100
0.1uF
SHEET 1 OF 1
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