I have a Yamaha RX-V650 receiver that has developed a fault.
If you switch it to standby for any length of time, ie overnight, it won't then power back on again. I have discovered that if you pull the mains plug out of the socket and then plug it back in again, something clicks within the amp, and you can then power it on.
This has been going on for about a week, but the other night it seemed to be worse. It took several goes of unplugging, replugging before it came on. Once on it works perfectly well.
From my brief description could anyone hazard a guess as to what's going on?
I have searched the web in vain for a service manual hoping that might give me a clue. If it's something like a failing component then I'm sure i would be capable of replacing it.
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forum.eserviceinfo.com/viewtopic.php?t=59945 10 posts - 6 authors
Posted: Sat Aug 29, 2009 1:26 pm Post subject: Yamaha RX-V650 won't power on ... When i came back from a holliday, my receiver won't power up anymore. .... isn't powered (no voltage on the base) when the receiver doesn't comes on.
What speakers you have connected? This receiver supports only 6 and 8 ohm speakers (not 4 ohm). Also check if the ohm settings are correctly set in Advanced Setup (in standby press on the front panel STANDBY while holding STRAIGHT button). In this menu check the setting SP IMP. (speaker impedance) if it maches your speakers (6 or 8 ohm). Disconnect all inputs and also all speakers. With nothing connected, try to increase the volume. If it still will power off, the unit is probably faulty and should be repaired. If it does turn off only with speakers connected, check the speaker wires and the speakers, the problem will be there.
check the standby power supply first and then the main power supply.also check the output transistors and fuses your problem is in one of those points, normally the standby transformer goes bad, it is the small one right next to the big one.
This was happening to mine also, all of a sudden. This solution came from the owners manual. Sure enough, the impedance selector was stuck in the middle , between 4 and 8 ohms....I also, made sure the speaker wires were not touching each other at the splice. Problem fixed. B
The unit fails to turn on when STANDBY/ON is pressed, or set in the standby mode suddenly soon after the power has been turned on.
The power cord is not plugged in or the
plug is not completely inserted.
The IMPEDANCE SELECTOR switch
on the rear panel is not fully set to the
upper or lower end.
Firmly plug in the power cord.
Set the switch fully to the upper or
lower end when the unit is in the