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Yamaha AO8-DA8 Service Manual Page 17

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AO8
14
IC BLOCK DIAGRAM
HD74LVU04AFPEL (XY102A00)
Hex Inverter
IFC3: IC105
HD74LV04AFPEL (IS000400)
Hex Inverter
IFC3: IC311, 408
UNC: IC105
HD74LV08AFPEL (IS000800)
Quad 2 Input AND
IFC3: IC104, 310, 409
UNC: IC104, 213
SN74LV138ANSR (IS013810)
3 to 8 Demultiplexer
UNC: IC211, 212
HD74LV245AFPEL (IS024500)
Octal 3-State Bus Transceiver
IPC2: IC104, 105
IFC3: IC101-103, 106, 107, 404-407,
601-608
UNC: IC102, 204, 210
DS26C32ATMX (XU815A00)
Quad Differential Line Receiver
IPC2: IC100-103, 106
AM26LS31CNSR (XU996A00)
Quad Line Driver
IPC2: IC107
SN75124N (XE737A00)
Triple Line Receiver
IPC4: IC300
SN75121 (XE638A00)
Dual Line Driver
IPC4: IC301
1
2
3
4
5
6
7
1A
1Y
2A
2Y
3A
3Y
Vss
14
13
12
11
10
9
8
VDD
6A
6Y
5A
5Y
4A
4Y
1
2
3
4
5
6
7
1A
1Y
2A
2Y
3A
3Y
Vss
14
13
12
11
10
9
8
VDD
6A
6Y
5A
5Y
4A
4Y
1
2
3
1A
1Y
42A
52B
62Y
7
VSS
1B
14
13
12
VDD
4A
11 4Y
10 3B
9 3A
8 3Y
4B
1
2
3
4
5
6
7
A
A
Select
Enable
Output
Output
B
B
C
C
G2A
G2A
G2B
G2B
G1
G1
Y7
Y7 Y5
Y4
Y3
Y2
Y1
Y0
Y6
16
15
14
13
12
11
10
Vcc
YO
Y1
Y2
Y3
Y4
Y5
8
GND
9
Y6
1
2
3
4
5
6
7
20
19
18
17
16
15
14
Vcc
G
B1
B2
B3
B4
B5
B6
B7
B8
8
9
10
12
11
GND
A8
A7
A6
A5
A4
A3
A2
A1
D1R
13
1
2
3
4
5
6
7
INPUT A
INPUT A
OUTPUT A
OUTPUT C
INPUT C
INPUT C
GND
ENABLE
16
15
14
13
12
11
Vcc
INPUT B
INPUT B
OUTPUT B
ENABLE
OUTPUT D
INPUT D
8
9
10
INPUT D
+
-
-
+
+
-
-
+
1
2
3
4
5
6
7
1A
1Y
1Z
2Z
2Y
2A
GND
ENABLE G
16
15
14
13
12
11
Vcc
4A
4Y
4Z
ENABLE G
3Z
3Y
8
9
10
3A
H= high level
L= low level
X= irrelevant
Z= high impedance (off)
OUTPUTSENABLESINPUT
A
GGY Z
H
H
X
X
L
X
X
L
L
H
H
L
H
L
Z
L
H
L
H
Z
H
L
H
L
X
1A
1B
2R
2S
2A
2B
2Y
GND
1 16
2 15
3 14
4 13
5 12
6 11
7 10
8 9
Vcc
1S
1R
1Y
3A
3S
3R
3Y
Vcc
2F
2E
2A
2Y
GND
1Y
2C
2B
2D
1A
1B
1C
1D
1E
1F
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
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