Troubleshooting; Troubleshooting For The Power Supply; Troubleshooting For The Micro Processing System - ELCOM EURO-2500 Service Manual

© Elcom s. r. o.
The troubleshooting for the ECR can be divided into the following subgroups:
•

troubleshooting for the power supply,

•

troubleshooting for the micro processing system,

• printing troubleshooting,
• display troubleshooting,
• keyboard troubleshooting,
• troubleshooting for the real-time circuit,
• communication troubleshooting,
• troubleshooting for the other errors.
Keep in mind the following instructions during the troubleshooting.
7.1 Troubleshooting for the power supply 7.1 Troubleshooting for the power supply
• ECR doesn't function after it has been turned on
external power supply malfunction
main power switch is broken
broken fuse
either VCC +5 V or VH +24 V power supply is not functional
RAM memory is constantly erased after turning the ECR on
Note: Taking out the JP1 jumper while the ECR is off causes the RAM and the RTC to be erased.
Note: Malfunctions beyond these guidelines are to be entrusted to the authorised service centre of the Elcom company.
Doing so, you can avoid further unnecessary damage of electronics or PCBs.
7.2 Troubleshooting for the micro processing system 7.2 Troubleshooting for the micro processing system
the ECR doesn't react to anything after it has been turned on
Euro 2500
TX

7 Troubleshooting

- check the correct connection of the external power supply
- check the voltage on the external power supply connector
- check whether the witch connector is plugged correctly
- check thoroughly the cradle switch for the full functionality
- check the fuse filament integrity, replace the fuse in case the fuse is spent.
If the fuse breaks fresh after it has been replaced, try searching for the er-
ror by disconnecting the individual ECR circuits
- check the +5 V and +24 V voltage
- if the +5 V power supply is not functional or its value is incorrect, check all
the circuit parts according to its scheme, mainly U8
- check for short-circuited parts of the +5 V power supply circuit, mainly
caused by damaged semiconductor parts
- if the +24 V power supply is not functional or its value is incorrect, check
the U9 in the reset controller as first, then check all the parts of the power
supply circuit, mainly the T3 transistor
- check for short-circuited parts of the +24 V power supply circuit, mainly
caused by damaged semiconductor parts, printer head, paper tape cutter
circuits, and step-motor circuits
- check the JP1 jumper position, it should be farther from GND
- check the back-up accumulator voltage and current; if they are incorrect
and the ECR was not in use for a longer period of time it is necessary to
charge the accumulator or to replace it
- as first check the connection of the cashier display DISP1 and the connec-
tion of the internal segment display (both have to be connected and they
shall be functional, of course)
- check all the connectors and connecting cables for those displays
- check the fit and orientation of the EPROM memory chip
- check the fit of connectors that connect the printer PCB to the main PCB
- check the functionality of the reset and stand-by controllers
- if former checks yielded no error, there is a high probability of erroneous
EPROM
Service manual