Yamaha AD8HR Service Manual page 19

IC BLOCK DIAGRAM
(X2313A00)
TC74VHC00FT
Quad 2 Input NAND
MAIN: IC53
1A VDD
1 14
1B 4B
2 13
1Y 4A
3 12
2A 4Y
4 11
2B 3B
5 10
2Y 3A
6 9
Vss 3Y
7 8
(IS003200)
HD74LV32AFPEL
Quad 2 Input OR
MAIN: IC12
1A Vcc
1 14
1B 4B
2 13
1Y 4A
3 12
2A 4Y
4 11
2B 3B
5 10
2Y 3A
6 9
GND 3Y
7 8
(XV930A00)
SN75124NSR
Triple Line Receiver
MAIN: IC925
1A Vcc
1 16
1B 1S
2 15
2R 1R
3 14
2S 1Y
4 13
2A 3A
5 12
2B 3S
6 11
2Y 3R
7 10
GND
8 9 3Y
（IC ブロック図）
(XY102A00)
HD74LVU04AFPEL
Hex Inverter
MAIN: IC7
1
1A
2
1Y
3
2A
4
2Y
5
3A
6
3Y
7
Vss
(IS007400)
HD74LV74AFPEL
Dual D-Type Flip-Flop
MAIN: IC6
1
1CLR
2
1D D
D
3
1CK CK
4
1PR
PR
CK
5
Q
1Q
PR
6
Q
1Q Q
7
GND
Q
INPUTS OUTPUTS
PR CLR CLK D Q
L H X X H
H L X X L
L L X X H
H H f H H
H H f L L
H H L X Q
(IS013810)
SN74LV138ANSR
3 to 8 Demultiplexer
MAIN: IC962
A 1
A
Select
2
B Y0
B
3
C Y1
C
4
G2A G2A Y2
Enable
5
G2B Y3
G2B
6
G1 Y4
G1
Output
7
Y7
Y7 Y5
Y6
8
GND
TC74VHC08FT
Quad 2 Input AND
MAIN: IC61,901
14
VDD
13
6A
12
6Y
11
5A
10
5Y
9
4A
VSS
8
4Y
SN75121NSR
Dual Line Driver
MAIN: IC926
14 VCC
13
2CLR
12
2D
11
2CK
10
2PR
9
2Q
8
2Q
GND
Q
L
H
H
L
H
Q
O O
SN74LV139ANSR
Dual 2 to 4 Demultiplexer
MAIN: IC16
16 Vcc
15
YO
14
Y1
13 Y2 1Y0
Output
12
Y3 1Y1
11
Y4 1Y2
10 Y5 1Y3
9 Y6 GND
AD8HR
(XV891A00)
1A VDD
1 14
1B 4B
2 13
1Y 4A
3 12
2A 4Y
4 11
2B 3B
5 10
2Y 3A
6 9
3Y
7 8
(XU816A00)
1A 1 16 Vcc
1B 2 15 2F
1C 3
14 2E
1D 4 13 2D
1E 5 12 2C
1F 6 11 2B
10 2A
1Y 7
8 9 2Y
(IS013910)
1G 1 16 Vcc
G
2
G 15
1A 2G
A
A
3 14
1B 2A
B
B
4
13 2B
Y0
5 Y0
12
2Y0
Y1
Y1
6 11
2Y1
Y2
7 Y2
10 2Y2
Y3
Y3
8
9 2Y3
19