Panasonic SA-HT280 Service Manual page 73

SCHEMATIC DIAGRAM-7
C1042
1000P
M
R1042
I
0V
34
35
1.6V
J
36
1.6V
37
K
1.6V
38
L
R1041
39
4.9V
33
40
41
0V
42
0V
43
0V
44
P O N
C1044
R1048
C1045
C1046
C1047
A
B
C
D
E
20 19
:POSITIVE VOLTAGE LINE
33
33 32 31 30 29 28 27 26 25 24 23
D IN1 A OUT2
D OUT2 A OUT1
D OUT1 A GND2
LRCK +VA
SCLK IC1002 A GND1
D GND2 CS4226-KQG FILT
+VD DIR/DAC/VOL CM OUT
D GND1 A INAUX
RX1 A IN1L
RX2 A IN1R
RX3 A IN2R
/F1
1 2 3 4 5 6 7 8 9 10 11
100P C1050
1000P
100K
100P
1000P
1000P
A B C D M A L K
2.6V
A C B D
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2
B
To SURROUND CIRCUIT(CN1002B)
on SCHEMATIC DIAGRAM-3
:FM/ AM SIGNAL LINE :SURROUND SP SIGNAL LINE
:CENTER SP SIGNAL LINE :SUB WOOFER SIGNAL LINE
Q
R
S
R1055 1K
H
R1056 1K
B
R1057 1K
C
R1058 1K
D
R1059 1K
E
R1060
1K
2.4V
22
F
2.4V
21
G
R1061
20
1K
4.9V
19
R1068 C1052
18
47K 0.01
0V
17
2.4V
16
2.4V C1051
15
1500P
2.4V
14
2.4V
13
2.4V C1053
12
0.1
C1049
1000P
1
0V
2
3
0V
J I
4
5
0V
6
R1038
1K
5V
7
0V
8
R1040
1K
5V
9
10
B C D A
P O N M L K J I H G F E D C B A
CN1002
1 16 15 14 13 12 11 10 9 8 7 6 5
B
To SURROUND CIRCUIT(CN1001B)
on SCHEMATIC DIAGRAM-3
4.9V
4.9V
IC1004
SN74AHCT244PW
LOGIC CONTROL
4.9V
20
1G Vcc
C1041
0.1
19
1A1 2G
0V
Q
18
2Y4 1Y1
1.3V
17
1A2 2A4
0V
R
16
2Y3 1Y2
2.6V
15
1A3 2A3
0V
14
2Y2 1Y3 S
2.6V
13
1A4 2A2
12
2Y1 1Y4
1.3V
11
GND 2A1
F H G E
4.9V
L1004
2.2 H
4.9V
CN1001
4 3 2 1