Matthew H Rocky Hill , CT October 25, 2016 Appliance: Jenn-Air Over The Range Microwave JMC8100ADS Jenn-Air Microwave Jmc8100ads: Microwave had no power and no lights. How to replace Capacitor. I have a Jenn-Air microwave that didn't turn on and had no lights. It just stopped working completely. I unplugged the unit and had to remove the rear cover using a *security screw kit* that prevents people from opening the rear panel. Once opened, I removed the fuse and testing it with an OHM reader to determine that the fuse went bad. But I also had to determine why the fuse blew and noticed a sticky oily substance under the Capacitor. I used a rubber glove and needle nose pliers to remove the leads to the capacitor and then used the rubber glove and 2 screw drivers to see if the Capacitor was still holding a charge by shorting it and it wasn't. So I ordered a replacement capacitor and fuse. Once installed, I assembled the microwave and turned it on and it worked perfectly. I recommend being very caution when working with the capacitor because I read online that it could hold a very powerful charge, even though it was unplugged. So I was careful to use rubber gloves and tried shorting it to discharge the capacitor before working on the microwave. 65 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes