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I/O-PB-11
Casio I/O-PB-11 Service Manual
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— 27 —
TC74HC4050AP
(TOP VIEW)
6.
IC DATA
TC74HC00AP
QUAD 2-INPUT NAND GATE
(TOP VIEW)
SELECTED
G
B
A
Y0
Y1
Y2
Y3
OUTPUT
H
X
X
HHHH
NONE
L
L
L
L
HHH
Y
0
LL
H
H
L
H
H
Y
1
LH
L
H
HL
H
Y
2
L
H
H
HHH
L
Y
3
INPUTS
SELECT
OUTPUTS
ENABLE
TC74HC139AP
(TOP VIEW)
X: Don't care
TC74HC02AP
(TOP VIEW)
1
2
34
5
6
7
8
9
10
11
12
13
14
1Y
1A
1B
2Y
2A
2B
VSS
3A
3B
3Y
4A
4B
4Y
VDD
TC74HC244AP
(TOP VIEW)
TC74HCU04AP
HEX INVERTER
(TOP VIEW)
28
30
Table of Contents
Table of Contents
2
In/On-Line Board I/O
3
To Install the I/O-Pb-11
3
Interface
5
C-In Line (ECR to ECR)
5
On Line
8
Circuit Explanations
10
Address Selection
10
Scale Buffer Circuit
11
On Line Circuit (RS-232C)
12
C-In Line Circuit
14
Diagnostic Operations
17
To Start the Diagnostic Operation
17
Check Items for I/O-PB-11
18
Operations
18
Error Code List
26
IC Data
29
Parts List
32
Pcb Layout
34
Circuit Diagram
35
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Casio I/O-PB-11 Specifications
General
Brand
Casio
Model
I/O-PB-11
Category
Cash Register
Language
English
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