Philips FW-C870/19 Service Manual page 73

0022 A2 2924 D8 2930 E9 2937
1921 C18 2925 C9 2931 C2 2938
1922 C2 2926 E9 2932 D14 2939
1925 E18 2927 A9 2933 B9 2940
1928 D2 2928 G9 2934 G9 2944
2923 B8 2929 C9 2936 G7 2945
1 2 3 4
CENTER &AMPLIFICADOR SURROUND (40W + 40W)
A
0022
C 3
GND 2
S 1
B
1922
3
C
C
2931
2
GND
4n7
1
S
D
1928
1
NC
2
NC
4 0V
DC
DC
E
AMP ON = –52V
9
GND S
AMP OFF (MUTE) = 4,7V
6921 3945
3
AMP OFF 100k
1N4148
5
+VL +VL
+37V +37V
F
3933
6
+VL +VP
47E
+37V +37V
2950
2946 2944
7
10µ 22µ 47n
GND C
8
GND
G
–VL 10 –VL
–37V –37V
3934
11
–VL –VP
47E
–37V –37V
2951
2945
–VL
From 1268
22µ 47n
–37V
POWER SUPPLY
(2x 130W + C/S)
H
1 2 3 4
A10 2946 F2 2955 C17 3926
G10 2950 F3 2956 E17 3927
G11 2951 H3 2957 G5 3928
H14 2952 F6 3921 B7 3929
F3 2953 C15 3922 D7 3930
H3 2954 E15 3925 C8 3931
5 6 7 8
3921 2923
470E
2µ2
3925 3927
3922 2924
470E
2µ2
3926 3928
7925
3948 3978
BC547B
220E 1k
–37V
2952
3946 3947
1000µ
MUTE
–VP –VP –VP
CIRCUIT
–37V –37V –37V
7927
BC547B
3980
7932
–37V
2957 7931
100k
3981 BC557B
BC547B 0V
2µ2
3982 10k
0V
–37V
100k
6939 2936
–37V
3985 3984 3983 3979
1N4148 47n
–VL –VL –VL –VL –VL
–37V –37V –37V –37V –37V
5 6 7 8
E8 3932 F10 3938 G11 3948 E6
C8 3933 F2 3940 H11 3963 C15
E8 3934 G2 3941 H14 3964 E15
A9 3935 H13 3945 E4 3965 C15
G9 3936 H12 3946 F5 3966 E15
A10 3937 G13 3947 F6 3967 D16
9 10 11 12
3931
56k
2937
+37V +37V
2927
+VP +VL
3929
4p7
7930
220p
9 3 STK407_040B
2933
+VP +VC
µ
22
10 IN1
0V
2925 2929
3n3 470p
11 NF1
0V
AMP ON = –35V 12 CCC
MUTE = –37V
14 IN2
0V
2926 2930
3n3 470p
13 NF2
0V
–VP –VC2 –VC1
8 –37V 1 –37V 2
3932
–VP
56k SOAR PROTECTION
–37V
2938
2928
3930
4p7
220p
0V BC547B
3938
2934 7924
1k8
BC547B
22µ
2939
3936
10µ
3940
–VL –VL –VL –VL
–37V –37V –37V –37V
9 10 11 12
3968 F16 3981 G6 3994 F16
3969 D17 3982 G5 5921 C15
3970 D17 3983 G6 5922 E15
3978 E7 3984 G5 6921 E4
3979 G8 3985 G4 6939 G5
3980 G8 3993 D16 6941 G16
13 14 15 16
+37V
+VL
3963
3965
4E7
OUT1 6
5921
0V
2953
9949
47n
Substrate 15
3967
2932
47n
DC
+33V
3993
+VL
3964
3966
4E7
OUT2 7
5922
0V
2954
9950
47n
3968
3994
7923
3937 6942 6941
1k8
BZX79/ BZX79/
C39 C39
2940
3935
–VL –VL
10µ
3941
–VL –VL
.....V Amplifier ON
–37V –37V
13 14 15 16
6942 G16 7931 G5
7923 G13 7932 G7
7924 G12 9949 C16
7925 E6 9950 E16
7927 G8
7930 B12
17 18
A
B
1921 CENTER
1
C
2955 C
2
4n7
3969
D
3970
1925 SURROUND
1
E
L
2956
2
4n7
3
R
4
F
G
H
P5-VA C/S Amplifier 99 09 24
17 18