BOSE SD256131 Schematic
1.2 @ 530
7 @ 1710
PG2 D/1
+10V
+10V
+5V
+5V
PG2 C/1
2.2 (FM) 0 (AM)
7 (FM) 0 (AM)
1.3 @ 87.7
6.8 @ 107.9
PG2 C/1
PG2 D/1
0 (AM)
10 (FM)
Q101
146818
Q102
187601-001
10 (AM)
0 (FM)
PG2 C/4
+10V
PG2 C/1
PG2 B/1
PG2 C/4
3.5
8.5
3.5
3.5
8.5
8.5
1.2
4
4
5
5
10
11
12
13
14
15
_FMIFIn
1
_AMMixOut
2
3
_FMIFBypass
4
_AMIFIn
5
_Gnd
_Tu_LED
6
_St_LED
7
_Vcc
8
_FM_Disc
9
_AM_NB_CF
_FM_SMeter
1
_AM_SMeter
_IFBufOut
_PLL_LPF
4
_Pilot
U101
254561-001
FMSDAdj_
AMRFIn_
AM_AGC_
AMDetOut_
FMDetOut_
LDecOut_
RDecOut_
RAmpIn_
PG2 C/4
AMOsc_
VReg_
AFC_
DecIn_
LAmpIn_
LOut_
ROut_
2.2 (FM)
2 (AM)
30
29
6
28
27
26
25
24
23
22
22
21
20
20
19
19
18
17
17
16
6
3.5
3.5
3.5
3.5
0.5 (AM)
0.5 (AM)
3.2
2.8
3.2
3.2
4.2
4.2
4.1
4.1
+10V
PG2 D/7
PG2 C/8
PG2 C/8
+10V
PG2 C/4
PG2 D/2
PG2 C/4
+10V
6
8
1/2
7
4
5
U104
148584
SD256131 REV 01
SHEET 1 OF 3
AV28 SERVICE MANUAL 264563
+10V
+5V
+5V
+5V
+10V
+5V
+5V
+5V
+5V
+10V
+12V
+5V
+5V
1
2
3
4
5
6
7
8
9
10
1
11
12
13
14
15
16
17
18
19
20
21
22
24
23
2.5
5 (FM)
5 (AM)
0.2 (FM)
10 (AM)
2.3 (FM)
5 (FM)
0.2 (AM)
5 (FM)
0.2 (AM)
5
5
2.4 (AM)
2.2 (FM)
5
2
2.4
PG3 D/5
PG3 B/3
PG1 B/2
PG1 B/1
VRAW (+33V)
VRAW (+33V)
PG1 A/5
PG1 B/4
Q209
146817
PG1 A/5
PG1 B/5
PG1 B/6
PG1 A/5
U103
260347-001
Q208
147561-3
PG1 C/4
PG1 D/2
Q207
146819
PG1 B/5
PG1 D/6
PG1 B/7
+5V
VRAW (+33V)
8.3
147239
D203
3
2
D202
148582
1
U104
148584
PG1 B/5
3.5
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