Question about Yamaha RX-770
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Posted on Jan 02, 2017
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
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.
Posted on May 12, 2008
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
You can find a NEW transformer for you RX-700 at Best Buy. Link below:
Posted on Sep 10, 2010
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