Charlton B San Diego , CA June 08, 2015 Appliance: General Electric Microwave JE1860SB001 Ge Microwave Je1860sb001: Sparks from inside microwave when turned on. How to replace Cover, Waveguide. Existing cover guide was blackened from the sparks. Replaced wave cover guide. Problem fixed! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes