Paul F Justin , TX September 01, 2015 Appliance: General Electric Free Standing Microwave JVM1640CJ03 Ge Microwave Jvm1640cj03: Microwave not heating. How to replace Magnetron. Replaced Magnetron and works great. Took longer to remove from the wall than it did to replace the part. (4 screws and power connection). Glad I did price comparison as AppliancePartsPros.com was by far the best price. 18 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes