Yamaha MD4S Service Manual page 16

QQ
3 7 63 1515 0
TC7S86F1 (XR681A00)
Exclusive OR Gate
TC74LVC4245FS (XU229A00)
Dual Supply Octal Bus Transceiver
TE
L 13942296513
DIR 2
G 22
A1 3
A8 10
www
.
http://www.xiaoyu163.com
MAIN IC114
Vcc
IN B 1 5
2
IN A
3 4
OUT Y
GND
MAIN IC202
V V
CCA CCB
1 23 24
Logic
Level
Converter
Same as above block
11 12 13
x ao
y
i
http://www.xiaoyu163.com
8
M66004SP (XN173A00)
16 Digit 5 X 7 Sement VFD Controller
CS 14
SCK
15
SDATA 16
RESET 16
XIN
16
XOUT 20
Q Q
3 6 7 1 3
21
B1
14 B8
u163
.
2 9 9 4 2 8
SUB IC801
DISPLAY CODE
SERIAL
CGROM
REGISTER
RECEIVE
(35 BITX160)
(8 BITX16)
CIRCUIT
SEGMENT
OUTPUT
CIRCUIT
CGRAM
CORD/ (35 BITX16)
COMMAND
CONTROL
CIRCUIT
OUTPUT
PORT
(2 BIT)
DISPLAY
CONTROL
REGISTER
DIGITAL
OUTPUT
CLOCK DISPLAY
CIRCUIT
GENERATION CONTROLLER
V 1 24 V
CCA CCB
1 5 0 5 8 2 9 9 4
2 23
DIR V
CCB
A1 3 22 G
A2 4 21 B1
20
A3 5 B2
A4 6 19
B3
A5 7 18 B4
17
A6 8 B5
16 B6
A7 9
A8 10 15 B7
GND 11 14 B8
GND 12 13 GND
(TOP VIEW)
INPUTS FUNCTION
OUTPUTS
G DIR A-BUS B-BUS
L L A=B OUTPUT INPUT
L H B=A INPUT OUTPUT
H X Z High lmpedance
X : Don't Care
Z : High lmpedance
m
co
MD4S
9 9
59 SEG00
33 SEG26
31 SEG27
23 SEG35
18 P0
17
P1
12 DIG00
1 DIG11
64 DIG12
61 DIG15
2 8 9 9
16