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How to reset yamaha R-N402 power protection circuit
Remove the short that is causing the protection to engage, then power cycle, assuming it's a short circuit protection. If it's going in to thermal protection, then shut the receiver off and let it cool. If all speaker wires are disconnected and the unit is cool to the touch but still appears to be in protection mode, likely one of the output transistors has failed an will need to be diagnosed and replaced. Don't neglect to check the ESR of the electrolytic capacitors if you find a failed device internally.
on Jan 14, 2021
I have yamaha ex395 turn on for 3 second ten turn off how to fix
Unplug all your speakers and components. Then turn on, if it still locks up you have one of maybe 5 safety features hooked up that are built in to stop your amp from blowing. You will need to replace board or have some cool tech dude desolder and isolate . Look for wiring diagram for safety shut down system. Sorry but if it doesn't do it after you disconnect every thing then check each speaker with ohm meter to read factory specs.
on Nov 10, 2020
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