Casio QT-2100 Service Manual

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16. S-80130CNMC (IC30)
17. SN751178NSR (IC39) 18. SN75188PWR (IC34,35,38,41,42)
19. SN75189APWR (IC31-33,36,37) 20. TC74HC4050AFT (IC26)
DS
Delay Circuit
Oscillator
Circuit
Counter
Timer
OUT
VREF
VSS
VDD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1B
1A
1R
1DE
2R
2A
2B
GND
V
CC
1D
1Y
1Z
2DE
2Z
2Y
2D
INPUT ENABLE
OUTPUTS
DDE
YZ
HHHL
LHLH
XLZZ
H = high level,
L = low level,
X = irrelevant,
Z = high impedance (off)
DIFFERENTIAL INPUTS
A – B
OUTPUT
R
V
ID
. 0.2 V H
–0.2 V < V
ID
< 0.2 V ?
V
ID
3 –0.2 V L
H = high level,
L = low level,
? = indeterminate
11
12
13
14
V
CC+
4B
4A
4Y
3B
3A
1
2
3
4
5
6
7
8
9
10
V
CC-
GND
1A
1Y
2A
2B
2Y
3Y
1A
1Y
2A
2Y
2B
3A
3Y
3B
4A
4Y
4B
11
12
13
14
V
CC+
4A
4CONT
4Y
3A
3CONT
1
2
3
4
5
6
7
8
9
10
1A
GND
1CONT
1Y
2A
2CONT
2Y
3Y
A
Response
Control
Y
1
2
3
4
5
6
7
8
Vcc
1Y
1A
2Y
2A
3Y
3A
GND
NC
6Y
6A
NC
5Y
5A
4Y
4A
16
15
14
13
12
11
10
9

Casio QT-2100 Specifications

General

Brand	Casio
Model	QT-2100
Category	Cash Register
Language	English