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Can Transformer Hum Sound like a Crackling?

My Sanyo Combination Microwave EMC 8787B purchased from Target frequently makes a low crackling just audible noise when it is not in use but plugged in. The noise appears to be coming from the front bottom right hand corner and sounds like something arcing. The noise stops if the power is turned off at the wall. The oven otherwise appears to work perfectly.

When I asked Sanyo via their customer support on their website they said it was transformer hum, normal and safe. The sound is coming from where they say the transformer is located but I would expect transformer hum to be rhythmic with a fairly constant frequency and volume - the crackling I hear randomly changes in volume and frequency. What do you think. It's only a few months old and still under warranty so I don't feel disposed to opening up for further investigation.

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Regards
Blue

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Reply to
aussiblu
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You could try it on a different power circuit away from its current location to see if it is an issue with power line noise.

Noises when not turned on would be enough inducement for me to take it back regardless of what the Sanyo representative thinks it is. Transformer hum is exactly that... a hum at 50 or 60 Hertz depending on where you are. Crackling does not constitute a hum.

Take it back and say you think it is unsafe and are afraid it might catch fire. Let them prove to you that it's safe. Don't just take their word for it over the phone.

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Krypsis
Reply to
Krypsis

"aussiblu"

** See if the noise changes if the oven is bumped or tapped firmly with the handle of a screwdriver in that area.

If it does react, then there is a bad connection or solder joint.

BTW the transformer in question is a tiny PCB one - right ?

... Phil

Reply to
Phil Allison

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