Locate the two wires which are connected directly to the power cord. Unlike the other wires, they are sheathed in a particularly thick, dot-textured plastic.

Make sure the voltmeter is on and set to a setting beween 120 and 500V. For most voltmeters the proper setting for this is the 200V setting.

Attach one of the voltmeter's probes to the metal portions of each of the two wires connected to the power cord's end on the device

The voltmeter should read a number significantly above 20V. A reading between 100 and 150 V indicates that the device is getting enough power. A lower number indicates the power cord is broken.