Verify Power is being supplied

Using a multimeter on AC setting, check that wall outlet is 120 Vac

If not, then switch to another source. otherwise proceed to next step.

Using a multimeter on DC setting, check that scanner wall power pack is providing 24 Vdc

If not, then locate and obtain another ( Compatible ) power pack. Unit should be obtained from manufacturer and if not available then the following is the rated specification at time of this guide ( Input=100-240Vac 1.0A Max 50-60Hz Output=24Vdc 0.75A 18W ) Center Positive Polarity