Question about Aiwa XR-M55 Shelf System

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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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Read here for the all the unit specification: http://www.fixya.com/BrowseManual.aspx?prdid=199676&hlt=specification&mnlid=1020&__PAGED_=33

Posted on Nov 15, 2005

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Posted on Jan 02, 2017

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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,
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The "Buzzing" may come from the fans.
There are fans in the powersupply, on the CPU, in the front.

It could be a faulty:
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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

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A couple of weeks after initial setup of my brand new Onkyo XT-SR606 receiver, I noticed a loud buzzing noise that starts up approximately 10 min after the receiver is turned on. The buzzing is definitely...


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.

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1 Answer

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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.

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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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