You will need a meter to check things. Remove the side screws from the right side panel and tilt down. Locate the fuse inside. If blown, order a new one by clicking on your model # above. Replace the fuse close door and check for a short across the power plug, if none locate the high voltage capacitor, an oval aluminum item and short across the terminals. Now check ohms across it, replace if shorted, if ok, plug in microwave, select cook and put a container of water in cavity before turning on the unit.If fuse is still good, you will probably be good to go.
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