Helen for Model Number JVM1870sf001 GE Profile Microwave purchased and installed on 4/8/2004. Everything works as usual EXCEPT there is NO HEAT. Profile Model today is the same price -- $599.00 or so.... Other models/manufacturers sell over the range models in the $200 to $275 range. Questions: Is it worth the effort to try and repair....and if so...where to start? Thank you.
Answer Hello Helen. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron. Read More... Answered by AppliancePartsPros.com | Wednesday, October 25, 2017