Yamaha DM2000 Service Manual page 70

DM2000
SN74LV138ANSR (IS013810)
SUB: IC118
TC74HC138AFEL (XW762A00)
SUB: IC125, 129
TC74VHC138F (XT015A00)
JK1: IC402
JK2: IC905
3 to 8 Demultiplexer
1
A
A
Select
2 B
B Y0
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
TC74VHC157F (EL) (XT475A00)
DSP: IC609-614, 656-661
Quad 2 to 1 Multiplexer
1
SELECT
2
1A G
1A
3
1B 4A
1B
4 1Y 4B
1Y
5 2A 4Y
2A
6
2B 3A
2B
7
2Y 2Y 3B
GND 8
TC74HC238AF (XT163A00)
PN1: IC102
PN2: IC309, 310
PN3: IC502
3 to 8 Line Decoder
Select
Enable
Inputs
70
TC74VHC139F (EL) (XW324A00)
CPU: IC125
JK1: IC401
Dual 2 to 4 Demultiplexer
16 Vcc
15 YO
14
Y1
13 Y2
Output
12
Y3
11
Y4
10
Y5
9 Y6
HD74LV165AFPEL (IS016500)
PN1: IC105-107
PN2: IC303, 304
PN3: IC507-509
8-Bit Shift Register
SHIFT/
16 Vcc
LOAD
15 CLOCK
STROBE
14
4A
13
4B
PARALLEL
INPUTS
12
4Y
11
3A
OUTPUT
10 3B
9 3Y
A 1
B 2
Inputs
3
C
G2A 4
G2B 5
G1 6
Y7 7
GND 8
1G 1 16 Vcc
G
2
G 15
1A 2G
A
A
3 14
1B 2A
B
B
4
1Y0 13 2B
Y0
5 Y0
12
1Y1 2Y0
Y1
Y1
6
11
1Y2 2Y1
Y2
7 Y2
1Y3 10 2Y2
Y3
Y3
8
GND 9 2Y3
1
16 Vcc
CLOCK
2
15
INHIBIT
3
E D 14
E D
F 4 F C 13 C
PARALLEL
INPUTS
5 G B 12
G B
6
H A 11
H A
SERIAL
SERIAL
7 Q
10
H
INPUT INPUT
Q
H
Q
H
OUTPUT
8
GND 9
Q
H
TC74VHC153F (XV794A00)
JK1: IC054, 056, 057
Dual 4 to 1 Data Selectors
1G SELECT 1 16 Vcc
STROBE B 2
15 SELECT 2G
1G
3 14 STROBE A
IC3
2G
4
IC2 13
DATA 2C3
INPUTS
5
IC1 12
2C2
B
B
IC0 2C1
6
11
B B
A
A
OUTPUT 1Y 7
1Y 2C0 10
A
A
GND
8
2Y 9 OUTPUT 2Y
HD74LV175AFPEL (IS017500)
JK2: IC802
Quad D-Type Flip-Flop
1
CL 16 VDD
2
1Q 15 4Q
Q CL CL Q
CK CK
Q D D Q
3
14
1Q 4Q
1D 4 13 4D
5 12
2D 3D
6
11
2Q Q D D Q 3Q
CK CK
Q CL CL Q
7
2Q 10 3Q
8
Vss 9 CK
16 Vcc
15 Y0
14 Y1
13
Y2
Data
12 A 1
Y3
Output
B 2
11 Y4
C
3
10 Y5
G2A 4
9 Y6
G2B 5
G1
6
Y7 7
GND 8
DATA
INPUTS
16 Vcc
15
Y0
14 Y1
13 Y2
12
Y3
11
Y4
10 Y5
Y6
9