Professional diagnostics for Heat-based Receipt Printers (80mm/58mm). Check heater elements and alignment.
Note: In the print dialog, ensure you select your thermal printer and set Paper Size to80mm / Roll. Browsers default to A4.
If prints start dark but fade halfway down, your Power Supply Unit (PSU) is failing. Thermal printing requires high peak current. Generic adapters often drop voltage under load.
Scanner not reading? Slow down print speed (e.g., to 150mm/s). High speeds can smear barcode edges. Also, ensure you are not using "High Compression" driver settings.
This web test uses your OS Driver (Windows/Mac spooler). Real POS software skips the driver and sends raw ESC/POS hex commandsdirectly to the port for instant speed.
This Thermal Printer Test Page is designed for 80mm (Standard) and 58mm receipt printers. Unlike inkjet/laser, thermal printers burn images onto paper using heat, requiring unique diagnostic patterns to verify head integrity and heat control.
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