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Viking Micro noise

PROBLEM: only during the microwave function, the unit makes loud "buzzing" noise 1 to 2 seconds after start up. All other functions work fine...other than buzzing. No sparks or other abnormalities.
The unit heats items in a normal time range, ie, nearly boils a cup of water in 1 minute.
There is NO abnormal noise while convection bake or broil is used.
As stated, other than the "buzzing or rattling" noise, the unit seemily works fine.
The unit is "new" (no warranty, bought as is) so there is no recourse with manufacturer.
Any insights welcome.
Thank you.
Dave

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  • dave y Jan 08, 2008

    The abnormal "noise" is continuous for as long as the microwave is on. Again, all other functions are normal. The noise starts 1 second after start up and lasts the whole cycle. The noise is not intermittant and is only during the microwave function.

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The noise is probably from the high-voltage transformer. When it is overloaded, the excess magnetic field it produces vibrates its wire coils. Odd that it only happens for a brief time. It is either defective itself (in which case it may go a long time) or it is getting overloaded by the magnatron/capacitor/diode on its output (in which case it will get worse shortly)
Hope Ya Fix it

Posted on Jan 08, 2008

  • Greg Collins Jan 08, 2008

    Ah, buzzes the whole cycle - that is the typical case. The high voltage cap and diode need replacing.

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