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Sorry for the delay!
Did you recently have any storms or power cuts before the problem started?
Ok, you will need to try clearing the memory:
1. Unplug the register.
2. Turn the control lock to the S position.
3. Press and hold the key position where the CHECK key is located on the default keyboard layout.
4. Continue to hold the CHECK key while plugging the register into a power source.
5. Press the upper left key of the keyboard, then the lower left key, then the upper right key, and finally press the lower right key.
It may take several seconds but eventually it will display that the memory has been cleared.
Let me know if it works ok when you do this.
Hi, just following up on your question - did my answer help?