Digi Sm-500 Scale User Manual -

If the printer activates but nothing is visible on the paper, the roll is likely loaded upside down. Thermal paper only has the heat-sensitive coating on one side. Paper Jam Error:

The manual dictates that the scale must be placed on a stable, level surface. Because the SM-500 is a precision instrument, vibrations from nearby refrigerators or uneven countertops can cause "drifting" (where the weight display fluctuates without product on the pan). digi sm-500 scale user manual