Question about GE Spacemaker JVM1640SJ Microwave Oven
Blows 20A line fuse upon starting a cook cycle.
Checked HV Cap, All interlocks, MGT TCO, Cabinet TCO. Checked for
continuity across magnatron filament. HV diode OK. My best guess
is a bad HV transformer. Has a slight transformer burn smell when the
cook cycle is started. Fuse blows approximately 1 second later.
When microwave is powered up with a new 20A line fuse, everything else works fine, ie: fans, lights, keypad, clock etc. Fuse only blows when starting a cook cycle. Using a mug of water in microwave as test. We have had the microwave since 1996 without a hitch. Is it worth replacing the transformer? I have found them online for $152 + S+H. I am a tech so I will be providing the labor. Thank you for your help.
Sounds to me like the magnatron has shorted out. i don't know of a way to test them unless you have some high dollar equipment. a continuity test prob wont tell you anything. what reading did you get on the cap when you tested it?
Posted on Jan 06, 2008
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