Philips FW-C870 Service Manual page 88

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