Oven would only display "door." Found open line switch. Replaced and only had the clock on the display with no other functions. Replaced touchpad and have all functions now. Put a plate in the oven, pressed start. Oven growled for about half of second then the door was displayed. What could have caused the fuse to blow again? (Assuming that is what happened).
Answer Hello Larry,
If it is the fuse blowing every time there is most likely a shorted component. You will have to open it up and test the components and make sure you test to the housing on each for a direct short to ground. This includes the high voltage transformer, the high voltage capacitor, the magnetron, and the harness. Be sure to unplug the unit and discharge the high voltage capacitor before servicing to prevent personal injury.
Microwave is working but stopped heating and smelled like rubber, Is this typically the Magnetron? Is there a strong possibility of something else you may suggest? I am handy and can take the unit out of the wall to do repairs, however for this repair would you recommend a tech or a relatively simple repair? I know that is a hard question not knowing me, but I will try anything once unless I need a specialty person.
Thanks for any help you can give me.
Answer Hello Todd. 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.