Bang & Olufsen BeoLab 3500 MKII 1601, Руководство по обслуживанию

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7. Block diagram Block diagram 7. 7.
22
POWER AMPLIFIER
- +
P1-1,2,3,4
-35V
P1-9,10,11,12
P1-5,6,7,8
POWER SUPPLY
35V
D200
C2 C1
3
2
1
1/2
IC100
4558
1/2
IC100
4558
5
6
7
TREBLE FILTER, 4. ORDER HP
P2-5
TREBLE IN
D12 D4
C14
R32
TO IC1 PIN 6
PA MUTE
P2-4
BASS IN
FROM
PCB 5
P9-20
PMUTE
P2-7
3
2
1
1/2
IC101
4558
BASS EXTENSION
2. ORDER HP
3
2
1
1/2
IC103
4558
1/2
IC103
4558
6
5
7
BASS EXTENSION 4. ORDER LP
5
6
7
1/2
IC101
4558
R109
LDR
BAND PASS FILTER
WITH ADJUSTMENT
3
2
1
1/2
IC102
4558
1/2
IC102
4558
R113
2. ORDER HP
DIFFERENTIAL FILTER
9V
5
6
7
R114
R129
5
6
1/2
IC104
4558
7 3
2
1
1/2
IC104
4558
R128
R127
R130
R109
LED
AMPLITUDE DETECTOR
BASS FILTER WITH ABL
R58
R66
12
13
14
1/4
IC2
1/4
IC2
1/4
IC2
1/4
IC2
10
9
8
C26
R67
5
6
7
3
2
1
TR7
D8 D9
POWER LIMITER BASS (LONG AND SHORT TERM)
PLIM
P2-6
TO PCB3 ?P
25
NTC
R78
9V
TR5
TR6
TREBLE PROTECT
TR3
MUTE
TRANSISTOR
1
2
10
TREBLE
R26
1/2
IC1
STK4171V
R27
POWER AMPLIFIER TREBLE
R69
PFAIL
P2-8
TO PCB3 ?P
R71 9V
P8-1
P8-2
TR10
TR9
TR8
MUTE
TRANSISTOR
TR4
1/2
IC1
STK4171V
R70
18
17
13
R52
R49
POWER AMPLIFIER BASS
BASS
9V
TR1
TR2
35V
9V
R4
R2
R5
SIGNAL MUTE
P2
1
P4
1
-9V
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
Block diagram for Power amplifier