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I need a bit more information but from what i can tell it's about the power supply capacitors issue, as this devices are known to develop such kind of humming annoying noise when they go under the specified value, let me know further,
Sounds like the fan clutch bearing is locked up. Running in direct drive will affect MPG drastically. Its a 2006 so its time to replace it. See if the fan blade will spin by hand with the engine off or if excessive wobble is present at the bearing.
This is the power transformer humming, sometimes when transformers get older you get vibrations in the windings due to magnetic fields generated within the transformer which causes the humming noise, It's more annoying than anything and won't affect the operation of the microwave.
The latest 450v2 include this metal portion 1 to isolate AC lines over IC's, metal part 2 is include in all versions, some technician remove them and that creates more hum at idle levels, by having both the latest 450v2's are the quietest of the v2's.
V1 did not use switching power supply, they use discrete circuit and that is why they are a bit quieter
the noise that you can hear is most likly to be a hum this is the power supply transformer ocillating it is quit common normally on cheaper range items but this is not always the case the noise is there when it is in use but the hum is obscured by the sound from the unit ie music of films i have dab stuff that does it really annoying at night
By chance have you tried making sure the laptop is not too close to the speakers? Sometime you will get feedback when the source is to close to high powered speakers. Also, check your jack cord and make sure no splits/cuts are visiable and the plugs are fully inserted.
hi, i once had the same problem with a kenwood cassette deck. it would play pre-recorded tapes perfectly but when it came to recording from another source i would get an annoying hum when playing back the recording, the fault turned out to be a faulty earth connection on the phono connectors on the rear, they were dry jointed and once resoldered the unit worked and the recordings were perfect. maybe you have the same problem? hope this helps?
If this is like my unit it is a high pitched squeal. I received my unit as a gift for Christmas 2007 and I thought it was defective. I contacted Homedics and they sent me a replacement but the problem persisted. As licensed amateur radio operator I am versed in electronics so I decided to track down the source of the noise. It turns out that the 16VDC power adapter is the source of the noise. It is what is called a "switching power supply" and is unfortunately not well filtered causing the high pitched squeal. I was able to get rid of the noise by modifying the power adapter and adding a 2200 microfarad capacitor in parallel with the output. This filters out the high frequency ripple and gets rid of the squeal. An alternative solution would be to search the Internet for a better 16VDC power adapter. It must supply 2 amps of power and have a 5.5mm OD/2.1mm ID center positive power connector.