Noisy transformer after about 10 mins use, my XR-m55 has a terrible buzzing noise coming from the main(big) transformer/powersupply, it would appear I'm not the only one with this problem. Is there an easy fix without replacing the transformer? If not what are the specs for the transformer so i can buy a new one.
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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,
Regards.
the low voltage transformer on the ERC control is vibrating from not doing anything,when you put a load on this transformer it will quit,only fix is to possibly remove ERC and jam a piece of NON-Flammable/NON-electrical metal to keep it from vibrating and try this first,if this doesn't help,replace the noisy board with this transformer on it
It looks as though you have ripple noise that amplifies into the output. First of all check if the mains voltage is going down to produce the low voltage hum. If not you will have to check the DC filter capacitors , couple in parallel to confirm the capacitor. IF the buzz is still coming through then you will have to isolate the preamp and wait it the fault is coming in. If not connect the preamp output to another amp to hear the same buzz to confirm the preamp to be faulty. If so you will have to trace by a voltage check when the buzz occurs to confirm if the preamp IC or the selector Ic is faulty. Some logic IC's can also produce this noise on static switching. If teh noise is appearing on both the channels, then I would still bet on the power section. So check once again on the rectifier/ regulators and capacitors. Hope this advice helps. Good day
The "buzz" you hear is a power hum made by the power supply transformer. It's technically called "Lamination hum" caused by the revering of electrical current through the power supply transformer. In some cases the hum can vibrate the chassis causing other loose material to vibrate. If you can, go to your dealer and check to see if other units of this same type typically make a hum this loud, and if not, see if he can solve the problem for you.
All transformers buzz though you cannot hear it normally. The big transformers on power lines like to buzz for all to hear. When a transformer in a stereo amp gets old and deteriorates or gets hot and expands the coils, melts the coil varnish and epoxy coatings then rattles at 60 times per second.
You can ignore it or change the transformer. There are too many layers of windings to try to stick anything in there.
Disconnecting a transformer results in inductive kickback -that's not money. It's a big, whopping electrical gotcha! Be careful! Good luck, Steve Medley
First of all, if you press against the right side of the outer cover of the oven, does that lessen the noise? If so, it may be that a rubber cushion on the side of the HV transformer has fallen off.
If it had that hum but was not heating, I would first check the HV rectifier diode.
But since it's cooking, I would say your magnetron is on the way out.
Unless the warranty is about to expire, I'd continue to use it and watch and wait.
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