Table Of Contents - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy
1 Introduction..................................................................................................................9
1.1 Euro-500TX Handy technical parameters ............................................................9
1.2 System configuration ............................................................................................9
1.3 Block chart of ECR Euro-500TX...........................................................................9
2 Circuit schemes and functions ................................................................................10
2.1 Power supply circuits..........................................................................................10
2.1.1 External power supply.........................................................................................................10
2.1.2 Primary power supply..........................................................................................................10
2.1.3 The +5 V power source (VCC) and the NMI signal generator.............................................10
2.1.4 The +5 V power source (VCC1) .......................................................................................... 11
2.1.5 Power supply for the printer performance circuits (VH) ...................................................... 11
2.1.6 Accumulator voltage to the VH voltage converter ............................................................... 11
2.1.7 NiMH accumulator charging circuit .....................................................................................12
2.1.8 Fiscal memory power supply circuits ..................................................................................12
2.1.9 Power supply voltages characteristics ................................................................................12
2.2 The microcontroller and its support circuits ........................................................13
2.2.1 The E-500TXN microcontroller............................................................................................13
2.2.2 Memory circuits ...................................................................................................................15
2.2.3 Start-up and turning off of the system .................................................................................16
2.2.4 Real-time circuit ..................................................................................................................16
2.3 I/O circuits...........................................................................................................17
2.3.1 Printing control circuits ........................................................................................................17
2.3.2 Keyboard.............................................................................................................................18
2.3.3 Displays...............................................................................................................................20
2.3.4 Communication circuits .......................................................................................................21
2.3.5 Connexion of fiscal memory circuits ...................................................................................24
2.3.6 Other circuits .......................................................................................................................25
3 Thermal printer LT1320 .............................................................................................27
3.1 Basic specification ..............................................................................................27
3.2 Thermal head .....................................................................................................27
3.2.1 Thermal head composition ..................................................................................................27
3.2.2 Data processing in the printing head...................................................................................28
3.2.3 Printing data and their position............................................................................................28
3.2.4 Thermistor specification ......................................................................................................28
3.2.5 Time diagram ......................................................................................................................28
3.3 Paper feeding .....................................................................................................29
3.3.1 Step-motor specification......................................................................................................29
3.3.2 Excitation sequence ............................................................................................................29
3.3.3 Control circuit ......................................................................................................................29
3.4 Printing head position sensor .............................................................................30
3.5 Paper tape presence detectors ..........................................................................30
3.6 Overall time diagram ..........................................................................................30
3.7 Printer connectors ..............................................................................................31
3.7.1 Printing head connectors ....................................................................................................31
3.7.2 Terminal for the sensors ......................................................................................................32
3.8 Cleaning of the printing head..............................................................................32
4 Reinstallation of individual modules .......................................................................33
4.1 ECR disassembly ...............................................................................................33
4.2 Reinstallation of accumulator .............................................................................35
4.3 Printer reinstallation............................................................................................35
4.4 Motor reinstallation .............................................................................................38
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