Yamaha ACU16-C Service Manual page 18

ACU16-C
TC74VHC245FT(XU797A00)
DAC: IC201, IC202, IC401, IC402
MAIN: IC219, IC503, 602, 603
74VHC245MTCX (X0296A00)
MAIN: IC219, IC503
TC74VHCT245AFT(XT744A00)
MAIN: IC407, IC410
BUFFER
D1R 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
SN75C1168NSR (XU073A00)
MAIN: IC302
LINE DRIVER
1
1B
2
1A
3
1R
4
1DE
5
2R
6
2A
7
2B
8
GND
18
DS36276M (X2155A00)
MAIN: IC307
RO
RE
DE
DI
20 V
CC
19 G
18 B1
17 B2
TC74VHC74FT (XV892A00)
16 B3
MAIN: IC212
15 B4
D-FF
14 B5
13 B6
1CLR
12 B7
1D
11 B8
1CK
1PR
1Q
1Q
GND
PR
L
H
L
H
H
H
TC74VHC04FT (X0195A00)
MAIN: IC509
INVERTER
16
Vcc
15
1A
1D
14
1Y
1Y
13
1Z 2A
12
2Y
2DE
11
3A
2Z
10
2Y 3Y
9 Vss
2D
1 8 V
CC
R
2 7 DO/RI
3 6 DO/RI
D
4 5 GND
1 14
VCC
2
13
D
2CLR
D
3 12
CK
2D
4
PR 11
CK
2CK
5
Q 10
PR 2PR
6 9
Q
Q
2Q
7
8
Q 2Q
INPUTS OUTPUTS
CLR CLK D Q Q
H X X H L
L X X L H
L X X H H
H f H H L
H f L L H
H L X Q Q
O O
1 14
VDD
2
13
6A
3 12
6Y
4
11
5A
5
10
5Y
6 9
4A
7
8
4Y
HD74LV273ATELL (X2689A00)
MAIN: IC207, IC214, IC218, IC417
D-FF
CLEAR 1 20 V
CC
1Q 2 19 8Q
Q Q
CL CL
D CK CK D
1D 3 18 8D
2D 4 17 7D
D CK CK D
CL CL
Q Q
2Q 5 16 7Q
3Q 6 15 6Q
Q Q
CL CL
D CK
CK D
3D 7 14 6D
4D 8 13 5D
CK D
D CK
CL CL
Q
Q
4Q 9 12 5Q
GND 10 11 CLOCK
NJM4580ED (XT157A00)
DAC: IC207-210, IC308-311, IC407-410,
IC508-511
µPC4570G2 (XF291A00)
DAC: IC205, IC206, IC306, IC307, IC405,
IC406, IC506, IC507
OP AMP
+DC Voltage
Output A 1 +V 8
Supply
Inverting
2 7 Output B
Input A - +
Inverting
Non-Inverting
3 6
+ - Input B
Input A
Non-Inverting
-DC Voltage Supply 4 -V 5
Input B
TC74VHC125FT (XY074A00)
MAIN: IC412, IC505, IC506
BUFFER
1
C1 14 Vcc
2 13
A1 C4
Y1 3
12 A4
4
C2 11 Y4
5
A2 10
C3
6
Y2 9
A3
GND 7 8
Y3