ELCOM Euro-50 Service Manual page 4

Euro-50
4.4. Keyboard malfunctions .................................................................................................................... 33
4.5. Malfunctions in communications .................................................................................................... 33
4.5.1. Malfunctions of RS232 communications ................................................................................................ 33
4.5.2. Malfunctions of USB communications ................................................................................................... 33
4.5.3. Malfunctions in communications with an SD card ................................................................................ 34
4.6. Power supply malfunctions .............................................................................................................. 34
4.6.1. Voltage on the power supply board (DPS E50 PWR) ............................................................................. 34
4.6.2. Malfunctions of the entry filter ................................................................................................................ 34
4.6.3. Malfunctions of the charger ..................................................................................................................... 34
4.6.4. Malfunctions of the 3.3V (VDDQ) power source .................................................................................... 35
4.6.5. Malfunctions of the 5V power source ..................................................................................................... 35
4.7. Other malfunctions ........................................................................................................................... 35
4.7.1. Malfunction in the circuits of the accumulator cover sensor ............................................................... 35
4.8. List of service items .......................................................................................................................... 36
5. THE CASH REGISTER CIRCUITS ................................................................................ 37
5.1. The motherboard ............................................................................................................................... 38
5.1.1. Abbreviations used ................................................................................................................................... 38
5.2. Configuration of the jumpers on the motherboard ........................................................................ 38
5.3. List of connectors on the motherboard .......................................................................................... 38
5.4. Microcontroller .................................................................................................................................. 38
5.4.1. Classifying of microprocessor outputs and values in the individual power modes
of the cash register ............................................................................................................................................. 38
5.4.2. Internal memory - RAM ...................................................................................................................... 42
5.4.3. Internal memory - FLASH .................................................................................................................. 42
5.4.4. RTC circuit ......................................................................................................................................... 42
5.4.5. RESET ............................................................................................................................................... 42
5.5. External memory subsystem ........................................................................................................... 43
5.5.1. RAM memory ............................................................................................................................................. 43
5.5.2. DataFlash memory .................................................................................................................................... 43
5.5.3. SD card ...................................................................................................................................................... 43
5.6. Supply 1.8V - supply voltage for the microcontroller core ........................................................... 43
5.7. Interface for connecting power supply boards .............................................................................. 43
5.8. Controlling printing ........................................................................................................................... 44
5.8.1.Supply voltage for the printer ................................................................................................................... 44
5.8.2. Printer head ............................................................................................................................................... 44
5.8.3. Measuring the temperature of the printer head ..................................................................................... 45
5.8.4. Shifting the paper ribbons ....................................................................................................................... 45
5.8.5. Printer sensors ......................................................................................................................................... 46
5.8.6. Interface for the journal motor ................................................................................................................ 46
5.8.7. Description of printer connectors and auxiliary sensors ..................................................................... 46
5.9. Keyboard ............................................................................................................................................47
5.10. Interface for connecting displays .................................................................................................. 47
5.11. The RS232 interfaces, USB Slave .................................................................................................. 47
5.12. Interface for an FM connection ...................................................................................................... 48
5.13. Buzzer ...............................................................................................................................................48
5.14. Power supply board ........................................................................................................................ 48
5.14.1. Input filter ................................................................................................................................................ 48
5.14.2. Charging the accumulator ..................................................................................................................... 48
5.14.3. Supply 3.3V - VDDQ ................................................................................................................................ 49
5.14.4. Supply 5V - EXT5V .................................................................................................................................. 49
Service manual
Elcom s. r. o.