Release the button when the printing starts. It should print a "ticket" showing the firmware version and current settings.

Indicates paper is missing; simply load a new stack. Lid Open: The printer platen or lid is not securely closed.

Correction : Load a fresh, uncreased stack of thermal paper into the channel tray.

: The GEN5 requires a consistent 24Vdc rail capable of sourcing up to 2.7A under active thermal load. Check terminal pins with a digital multimeter if the unit drops offline during heavy graphic rendering.