Casio QT-6000 - Troubleshooting; When an Error Occurs

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2. ALVCH16245 (IC8)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1DIR
1B1
1B2
GND
1B3
1B4
V
CC
1B5
1B6
GND
1B7
1B8
2B1
2B2
GND
2B3
2B4
V
CC
2B5
2B6
GND
2B7
2B8
2DIR
1OE
1A1
1A2
GND
1A3
1A4
V
CC
1A5
1A6
GND
1A7
1A8
2A1
2A2
GND
2A3
2A4
V
CC
2A5
2A6
GND
2A7
2A8
2OE
To Seven Other Channels
1DIR
1A1
1B1
1OE
1
47
48
2
logic diagram (positive logic)
terminal assignments
123456
A
1DIR NC NC NC NC 1OE
B
1B2 1B1 GND GND 1A1 1A2
C
1B4 1B3 V
CC
V
CC
1A3 1A4
D
1B6 1B5 GND GND 1A5 1A6
E
1B8 1B7 1A7 1A8
F 2B1 2B2 2A2 2A1
G
2B3 2B4 GND GND 2A4 2A3
H
2B5 2B6 V
CC
V
CC
2A6 2A5
J
2B7 2B8 GND GND 2A8 2A7
K
2DIR NC NC NC NC 2OE
NC No internal connection
FUNCTION TABLE
(each 8-bit section)
INPUTS
OPERATION
OE DIR
OPERATION
L L B data to A bus
LHA data to B bus
H X Isolation