Question about Siemens HB77L65GB 900 Watts Convection / Microwave Oven
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Jul 16, 2012 | GE JES1142SJ Microwave Oven
on Aug 18, 2008 | GE Spacemaker JVM1640SJ Microwave Oven
It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it.
This is a job for a proffessional but
if you are safety clued up, here's instruction.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.
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