Author Topic: Charred Magnetron Connector  (Read 2246 times)

Offline bushyiii

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Re: Charred Magnetron Connector
« Reply #10 on: May 14, 2013, 10:42:00 AM »
Thanks for the link to the picture of the HV Diode.  I had seen a rather large two lead rectangular component that I assumed was the HV Diode.  This helps a lot.

Offline tgoods

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Re: Charred Magnetron Connector
« Reply #11 on: May 14, 2013, 02:45:00 PM »
Okay, I assumed it wasn't heating.  I don't think I've ever heard a microwave bang before.  It's got to be the magnetron or it's arcing in the waveguide. 

Offline bushyiii

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Re: Charred Magnetron Connector
« Reply #12 on: May 14, 2013, 03:47:48 PM »
Banging might be too strong a word and send the wrong message.  Better to consider it as a very loud buzzing sound!  The oven heats well, I will try to isolate the failing component using an ohmmeter.

Offline shieldcracker

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Re: Charred Magnetron Connector
« Reply #13 on: July 23, 2013, 09:46:55 PM »
Your magnetron uW radiation is leaking past the RF gasket, or air is leaking in to the magnetron tube.
In any case the magnetron needs replacement.


Offline bushyiii

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Re: Charred Magnetron Connector
« Reply #14 on: July 24, 2013, 08:40:51 AM »
I replaced the magnetron, the buzzing continued unabated. 

We generally use the appliance for short periods, warm up items, coffee, tea, etc.  The buzzing is fairly loud during these events, recently I had the unit on for a longer period and the buzzing stopped.  I find that whenever the unit is on for longer than 3 minutes there is no buzzing. 

I am guessing the problem is really the xfmr, high current at 60 hz is probably shaking the darn thing, it probably heats up sufficiently by 3 minutes, expanding the wiring preventing the oscillation.  Anyhow, replacing the xfmr isn't a cost effective solution given the current price of a new unit.

Thanks to everyone for their suggestions and help.

 

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