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What causes the HV Diode to fail? My XL1400 stopped heating over the weekend, suspecting the cap, the cap appears to function as normal when tested with a DVM, however the diode does not conduct when forward biased. Not having a schematic, what could cause the diode to fail, can the magnetron fail in such a way that it causes the HV diode to fail? I can throw a new diode on it but do not want to feed diodes if there is a possibility that something down stream could continue to cause them to open. Is there a bench test or voltage reading (have scope can also look at waveforms) I can perform for the magnetron? Prefer to logically replace items rather than shot gun. Thanks
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Rank: Advanced Member
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Joined: 7/19/2007(UTC)
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The most common problem with "JVM" models for last 10 years is a faulty magnetron. So the chance it is bad in your microwave is very high and a bad diode is the first sign.
Gene.
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Rank: Member
Groups: Registered
Joined: 2/6/2008(UTC)
Posts: 2
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Thanks for the quick response Gene. I popped the covers and found the schematic. Ordering diode and magnetron. As the cap is part of the same ckt. do you know how often he cap fails? Sounds like I am luck to have gotten 10 years of this one, it has been a good one so far.
Thanks
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Rank: Advanced Member
Groups: Senior Expert, Administrators
Joined: 7/19/2007(UTC)
Posts: 27,455
Was thanked: 4 time(s) in 4 post(s)
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The capacitor usually lasts much longer and it is very easy to diagnose.
If the capacitor gone bad - it will cause an electrical short and blow the fuse.
Let me know how it goes.
Gene.
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