Casio QT-2100 Service Manual

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13. CIRCUIT DIAGRAM
MODEL : QT-2100 (EX-590)
CONTENTS
1. OPTION BLOCK DIAGRAM .................................................................................................... 71
2. MAIN PCB CIRCUIT ................................................................................................................ 72
2-1. MAIN PCB CIRCUIT (1/9) ................................................................................................ 72
2-2. MAIN PCB CIRCUIT (2/9) ................................................................................................ 73
2-3. MAIN PCB CIRCUIT (3/9) ................................................................................................ 74
2-4. MAIN PCB CIRCUIT (4/9) ................................................................................................ 75
2-5. MAIN PCB CIRCUIT (5/9) ................................................................................................ 76
2-6. MAIN PCB CIRCUIT (6/9) ................................................................................................ 77
2-7. MAIN PCB CIRCUIT (7/9) ................................................................................................ 78
2-8. MAIN PCB CIRCUIT (8/9) ................................................................................................ 79
2-9. MAIN PCB CIRCUIT (9/9) ................................................................................................ 80
3. KEYBOARD ............................................................................................................................. 81
3-1. KEYBOARD 1................................................................................................................... 81
3-2. KEYBOARD 2................................................................................................................... 82
4. CONNECTOR BOARD ............................................................................................................83
4-1. CONNECTOR BOARD 1.................................................................................................. 83
4-2. CONNECTOR BOARD 2.................................................................................................. 83
5. KEY SHEET SWITCH.............................................................................................................. 85
6. ARCNET BOARD .................................................................................................................... 86
7. LCD VOLUME ......................................................................................................................... 87
8. EXPANDED RAM BOARD (OPTION) ..................................................................................... 88
9. REMORT DISPLAY (OPTION) ................................................................................................ 89
Items Circuit Names Management Criteria Remarks
Power supply voltage Vp 22.8V ~ 25.2V (typ 24.0V) Waiting (no option)
Vcc 4.75V ~ 5.25V (typ 5.00V)
Vdd 4.75V ~ 5.25V (typ 5.00V)
V3.3 3.00V ~ 3.60V (typ 3.30V)
Vedo 3.20V ~ 3.60V (typ 3.30V)
V1.9 1.75V ~ 2.05V (typ 1.90V)
Vrts 1.75V ~ 2.05V (typ 1.90V)
Battery discharge current Vdeo 650uA (typ 300uA) Battery voltage 3.1 ± 0.1V
LCD drive voltage VLCD 26.6V ~ 39.4V (typ 28.0V) The LCD contrast is positioned in center.
Vcon 23.5V ~ 26.0V (typ 24.5 ~25.0V)
RS232C drive voltage +12V 11.4V ~12.6V (typ 12.0V) Option and loop back connector are not mounted in COM port.
-12V -12.6V ~ -11.4V (typ -12.0V)
Consumed voltage AC current 100V system (rated AC120V) Waiting (no option)
200V system (rated AC230V) Input value of AC voltage : rated voltage

Casio QT-2100 Specifications

General

Brand	Casio
Model	QT-2100
Category	Cash Register
Language	English