Why it happens
The paper size on the app does not match the roll, or the printer does not understand the print language the app sends.
How to fix it
- 1
The owner opens Settings, then Devices, then Receipt printer, then Paper size and print settings.
- 2
Wrong side or cut off: switch Paper size between 58mm (the small roll, most counter printers) and 80mm (the wide roll). It prints a test after you change it.
- 3
Blank paper: change Printer language, or tap Find the right format. It prints three numbered slips. Tell the app which number came out.
- 4
If none came out, tap Nothing came out at all.
- 5
Small pocket printers (cat style) cannot use the normal language. They need the Picture language.