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I have a USA market Yamaha stereo receiver RX-V563 which is 110V/60Hz. I have moved to China and have a 220V/110V stepdown transformer but I can not get my receiver to work. The lights come on but I can not get sound out. Could the 50Hz frequency be keeping the system from working?

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closed as off topic by Niall C., Tester101, ChrisF Feb 10 '12 at 11:52

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That is very likely the problem. The stepdown transformers step down the voltage, but do not increase the frequency - that is why a hair dryer, for example, will operate slower on 220V/50Hz when it stepped down to 110/50hz. The audio processing components of the receiver are likely depending on the correct input frequency. Its also possible that you might have damaged the receiver from doing this.

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This model is available in an international version with voltage selection, and in a specific USA version that only works on 110-120 volts. The USA version has 2 convenience outlets whereas the international version does not. These convenience outlets are almost certainly the reason it cannot be run at 220-240 volts. It is possible that it can be converted to 220-240 use, anyway (remove the USA outlets for safety reasons). The conversion could be tricky, but would involve rewiring the input to the big toroidal transformer so that the 2 windings are in series instead of parallel (probably what the voltage selector does on the international version).

However, it is possible the USA version has a smaller transformer (possible to do with 60 Hz), in which case the 50 Hz power will cause problems, including a lower voltage output to the electronics. If it does have a smaller transformer, there is a good chance it only has a single primary winding and cannot be converted to run directly on 220-240. Then the failure of audio due to this is a real possibility.

Google for the model number.

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