Circuit Diagrams - Casio QT-2100 Service Manual

13. CIRCUIT DIAGRAM
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
Power supply voltage Vp
Vcc
Vdd
V3.3
Vedo
V1.9
Vrts
Battery discharge current Vdeo
LCD drive voltage VLCD
Vcon
RS232C drive voltage +12V
-12V
Consumed voltage AC current
MODEL : QT-2100
Management Criteria
22.8V ~ 25.2V (typ 24.0V)
4.75V ~ 5.25V (typ 5.00V)
4.75V ~ 5.25V (typ 5.00V)
3.00V ~ 3.60V (typ 3.30V)
3.20V ~ 3.60V (typ 3.30V)
1.75V ~ 2.05V (typ 1.90V)
1.75V ~ 2.05V (typ 1.90V)
650uA (typ 300uA)
26.6V ~ 39.4V (typ 28.0V)
23.5V ~ 26.0V (typ 24.5 ~25.0V)
11.4V ~12.6V (typ 12.0V)
-12.6V ~ -11.4V (typ -12.0V)
100V system (rated AC120V)
200V system (rated AC230V)
— 70 —
(EX-590)
Remarks
Waiting (no option)
Battery voltage 3.1 ± 0.1V
The LCD contrast is positioned in center.
Option and loop back connector are not mounted in COM port.
Waiting (no option)
Input value of AC voltage : rated voltage