Onkyo TX-SR55 Service Manual page 29

A
SCHEMATIC DIAGRAM 10
I/O termianl sections
1
2
3
4
5
B
NADG-8368
R125
U114 1
IN
330
3
VCC
IN3
2
GND
TORX179L
R124
U113 1
IN
330
3
VCC
IN2
2
GND
TORX179L
R123
U112 1
IN
330
3
VCC
IN1
2
GND
TORX179L
U111 3
IN
2
VCC
OUT
1
GND
TOTX179L
L113
4
IN2
022M
L112
2
IN1
022M
C113
5
102k
5
9
4
8
RS-232C 3
7
2
6
1
C
VQ112
VOPT
C119
080D
R119
10K
R117
R114
C117 10K R118
C118 10K
104K
10
080D C120
080D
R113
C116
10 104K
R103
330
330
11 10
12 9
R105
13 8
R102
330
330
14 7
15 6
R104
VCHA C5-
16 5
C105
_STBY C5+
1/50
1/50
17 4
VSS C1-
+
18 3
C4- VCC
+
19 2
GND C1+
C106
20 1
C4+ VDD
+
1/50
C104
MPD4721GS
TX-SR55
U4
L115
022M
L116
022M
L114
022M
TX 12
DGND 11
RX5 10
RX4 9
DGND 8
RX3 7
RX2 6
DGND 5
RX1 4
RX0 3
DGND 2
DSP5V 1
P120A
4
232RZ/FRXD 3
232TX/FTXD 2
VCPU 1
+
L101
1/50
BLM21A102F
D
P103B