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I am an electronics tech. My microwave stopped heating anyting but everything seems to work. Can you give me some advice on how to determinr if the the problem is the Magnatron, Transformer or the capacitor. I do gave a voltmeter.
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The microwave in general can be divided in two parts: high voltage part and standard voltage part. The first thing you may want to determine is in which of these parts the problem is. Remove the top grille and open the control panel. Discharge the high voltage capacitor (#49 on the diagram). Remove the wires from the high voltage transformer primary windings and check for 120 VAC between them while the control calls for heat and the door is closed. Post the results. Here are the breakdown diagrams and Replacement parts for General Electric JVM1450WA01 Counter top microwave | AppliancePartsPros.comGene.
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The 120 Volts is present.What is the nest step/s?
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Originally Posted by: soundj  The 120 Volts is present.What is the next step/s? . Can you sent three steps at once? Thanks
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Thanks Gene
So far I have discharged the capacitor (there were no sparks upon discaharge), checked the primary of the transformer with the secondary disconnected from the capacitor and magnatron and got 120 volts and have checked the diode. The diode #50 show open circuit on X10, X100 and extremely high resistance on X10,000 ohms scales. I always thought that a diode should have close to 0 resistance on foward current. Should I try the diode first or replace both magnatron and the diode at the same time?
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The diode test you did required a very good meter. It is much easier and reliable to test it with a battery as described in the post linked in the previous reply.
Gene.
P.S. Did you remove the wires from the transformer primary before checking for 120 VAC between them?
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Originally Posted by: Gene Check the high voltage diode (#50 on the diagram) as described in one of our previous threads: http://forum.appliancepartspros...19868-diode-testing.htmlIf there is nothing wrong, replace the magnetron (#73). - The diode Part number: AP3192533
The diode testusing a 12 V battery shows 12.57 volts one way and 8.67 volts the other way. I removed the magnatron and looked at it. It doesn't show any dark areas in the small hole on the top (tube). The limiter on the side of the magnatron shown short with wires disconnected. As far as I can determine (based on the forrum test proceedure) the cap. checks OK. It sems to me that a clue is that the capacitor did not have a charge or give a pop when I shorted the terminals. Do you think the diode as well as the magnatron are bad and both should be replaced? I dont want to replace the mag. if it isn't necessary. Joe
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Joe,
The diode is bad. No doubt about it. Very likely this is the only problem.
Gene.
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