Question about Yamaha RX-770

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I have a Yamaha RX770 receiver, it suddenly stopped working. I replaced the blown fuse on the board. Tried to turn it on - It blew the fuse again. Do I need a new transformer?

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Posted on Jan 02, 2017

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SOURCE: YAMAHA R-V701 MAKES BUZZING SOUND & WONT TURN ON

This could be the indication of an open resistor, or bad Capacitor in power supply. May not be visible to eye, but if you look in PS. there should be atleast one big sized cap and every PS has a bridge rectifier, this is usually 4 diodes in series, check them and see if any open, shorted

Posted on Sep 06, 2007

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SOURCE: Yamaha RX-V420 No power

If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Dan

Posted on May 12, 2008

  • 1 Answer

SOURCE: Yamaha rx770 stereo receiver

I have the same receiver with the same problem. I fixed it by using a cleaning spray on the inside of the input switch. Deoxit 5 is the cleaner and it took care of the problem.

Posted on Jun 28, 2008

  • 1 Answer

SOURCE: where do I find and how much is a transformer for

You can find a NEW transformer for you RX-700 at Best Buy. Link below:
http://bestbuy.partsearch.com/Model/Yamaha+Electronics+Corporation/Yamaha/RX770.aspx?SearchTerm=True

Posted on Sep 10, 2010

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