Question about GE Spacemaker JVM1640SJ Microwave Oven

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Unit indicates voltage but oven produces no heat

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Might have to look for the series fuse to the magnetron, if blown and on replaccement if this blows again the magnetron is faulty and needs a replacement.
If this seems OK , the high voltage capacitor can be weak or open or short. replace and the microwave will work.
Finally check the door switch the temperatrue cut off unit , the main relay and the control board.

Posted on Sep 17, 2010

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The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.

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Pls post back any other symptoms or indicators other than 'no heat'.

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We have the full service manual for this model and have uploaded it to our site here to help you.

You will need the free Acrobat Reader to view or print it.

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