Receiver freezes at start-up. It does not show "Check SP wires" failure and the speaker IMP is correct. The unit will eventually turn itself on after 10, 15, 30 mins and works fine.

SOURCE: check sp wires?

Your problem most likly is not because of dust. Its a bad connection in the amp section or the protection circuit, or the speakers them self have a problem. There could also be a componet problem. Unless you know how to troubleshoot solid state electronics,you should take the unit in to be serviced. It would most likly cost more then its worth to repair. A unit this old is u replaced at this point. Good Luck

SOURCE: Yamaha Receiver RX-V630 not working (resets itself immediately)

This maybe an easy one. Have you unhooked all the wires going in to the stereo. "SP wires" means you have wires to the speakers are touching and the stereo is shutting down to avoid overloading. Hope this helps...

SOURCE: Yamaha RX-V1500 Shuts down after 2 seconds

This set is getting old and is in the Archives section of the Yamaha consumer guide area. But, you can still download the owners manual if you need one. If it is going into protection mode even when there are no speakers connected OR when the sound level is very, very low or zero it is not good news. Yes, unplugging the line cord will cause the protection system to reset itself. But, if it shuts itself off again soon after rebooting it is a sign of bad grease in the output stages -- in all probability. Let me explain: The audio output transistors are mounted to a large heatsink which keeps them cool during operation. They are electrically isolated from touching the heatsink by an electrical insulating washer. But, in order to keep them cool and allow for good thermal conductivity of the heat generated by the output transistors the washers are treated with a heat conducting grease. Over time this grease will dry out and lose its heat conductivity ability allowing the temperature of the transistors to rise; as the heat goes up they conduct more current and cause the protection system to activate and shut the set down (in order to avoid damage to the set). That is the most common cause of your symptoms. However, there are several other possibilities, but I give this explanation a 90% probability based on my experience.

SOURCE: Yamaha htr5730 receiver - turns off

You may have speaker wires touching each other or a short circuit in the wire. "Check SP Wires" means to check your speaker wires.

SOURCE: Check SP wires

if you checked wire carefully in high ohm reading and confirm no internal short circuit.-please follow me:-1-disconnect all speakers cables from receiver and check if it is fine-try to connect your speakers one by one until you find the bad one.if it is still shut down you will have a problem inside receiver itself and needs service center to fix.
-it maybe speaker check it also one by one with good known cable.