Yamaha DM2000 Service Manual page 71

TC74VHC244F (XT800A00)
CPU: IC118
DSP: IC904, 905
JK1: IC455, 458
JK2: IC903, 904
DS: IC003
Octal 3-State Bus Buffer
1G VDD (Vcc)
1 20
2G
2 19
1A1
1Y1
3 18
2Y4
2A4
1A2
4 17
1Y2
5 16
2Y3
2A3
1A3
6 15
1Y3
2Y2 7 14
2A2
8 13
1A4
1Y4
2Y1 9 12
(GND) Vss 2A1
10 11
74VHC541SJX (XY961A00)
DSP: IC001, 070-072, 126, 803, 806,
853-855, 903, 908, 909, 951, 952
Octal 3-State Buffer
G1
1 20 Vcc
A1 2 G2
19
A2
Y1
3 18
A3
4 Y2
17
A4
5 Y3
16
A5 Y4
6 15
A6 Y5
7
14
A7
Y6
8
13
A8
Y7
9 12
Y8
GND 10
11
SN74LV4040ANSR (IS404010)
DSP: IC701
12-Stage Binary Ripple Counter
1
Q12 16 VDD
Q12
2
15
Q6 Q11
Q6 Q11
3
14
Q5 Q10
Q5 Q10
4 13
Q7 Q8
Q7 Q8
5 12
Q4 Q9
Q4 Q9
6
11
Q3 CLR
Q3 CL
7
Q2 10 Input Pulses (
Q2 CK
8 9
Vss Q1
Q1
MM74HC273SJX (XY198A00)
FD1: IC104-109
FD2: IC104-107
TC74VHC273F (EL) (XY254A00)
JK1: IC405-408
JK2: IC801, 913
DS: IC004
Octal D-Type Flip-Flop
1
CLEAR
2
1Q
Q
CL CL
3
D CK CK
1D
4
2D
D CK CK
CL CL
5
Q
2Q
6
3Q
Q
CL CL
7
D CK CK
3D
8
4D
D CK CK
CL CL
9
Q
4Q
10
GND
HD74LV595AFPEL (IS059500)
PN1: IC103, 104
PN2: IC305-308
PN3: IC503-506
8-Bit Shift Register with Output
Latches
1
OB
OB
2
OC OA
OC
3
OD SER
OD
4 OE G
OE
5 OF RCK
OF
6
OG SCK
OG
7
OH OH SCLR
OH'
8
GND
HD74LV4051AFPEL (IS405100)
FD1: IC139, 140
FD2: IC128, 129
Single 8-channel
Multiplexer/Demultiplexer
Channel IN/OUT 4
1 CH4 V
DD
- do. - 6
2 CH6 CH2
Commons OUT/IN
3 COM CH1
Channel IN/OUT 7
4 CH7 CH0
- do. - 5
5 CH5 CH3
Control Inhibit
6 INH A
-DC Voltage Supply
7 VEE B
)
- do -
8 V C
SS
HD74LV245AFPEL (IS024500)
SUB: IC102, 106
TC74HC245AF (XS720A00)
AD: IC001, 002
DA1: IC901, 902
DA2: IC901, 902
FD1: IC101-103
FD2: IC101-103
PN1: IC101
PN2: IC301, 302
PN3: IC501
SUB: IC114, 124, 126, 128, 131-134, 138
20
VCC
TC74VHC245F (XT487A00)
19
8Q
Q
CPU: IC115-117, 119-121, 126, 134, 135
18 DSP: IC005-009, 013-020, 052-054,
D
8D
067-069, 127, 425-428, 606-608,
17
7D
D
615-620, 802, 805, 852, 901
JK1: IC403, 451-454, 456, 457
16
Q
7Q
JK2: IC803, 901, 902, 906-912
15
6Q
DS: IC002
Q
14
D 6D
TC74VHCT245AF (XV242A00)
13
5D
D
CPU: IC112, 131
12 DSP: IC002-004, 023-027, 055, 801,
Q 5Q
804, 851, 902, 906, 907, 953
11
CLOCK
Octal 3-State Bus Transceiver
D1R
16 Vcc
15
OA
14
SER
13
G
GND
12
RCK
11
SCK
10 SCLR
9 OH'
SN74LV4052ANSR (IS405210)
SUB: IC130
TC74HC4052AF (XS790A00)
FD1: IC110, 111
FD2: IC108
Differential 4-channel
Multiplexer/Demultiplexer
+DC Voltage Supply
16
Channel IN/OUT 2
15
- do. - 1
14
Y-COM
- do - 0
13
- do - 3
12
Control Input A
11
INH
- do. - B
10
VEE
- do. - C
9
VSS
DM2000
1
20 Vcc
2 19
A1
G
18
3
A2
B1
17
4
A3 B2
16
5
A4 B3
15
A5 6
B4
14
A6 7 B5
13
A7
8 B6
A8 12
9 B7
11 B8
10
1
0Y 16 VDD
2Y 2
2Y 2X 15
2X
3
Y-COM 1X 14 1X
3Y
4 3Y X-COM 13
X-COM
1Y
5 12
1Y 0X 0X
6
INH 3X 11
3X
7 A
10 A
B
8 9
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