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If the red led is blinking fast (8x/second) the power supply is likely damaged and the unit will need to be serviced. If blinking slow, the most likely cause would be a shorted speaker connection. To help find the cause, unplug everything including the power and speakers. Connect only the power and try to turn the unit on. If the light doesn't blink, you know you have a shorted connection. Power off and connect the inputs and then power back on. If the light is not blinking, you know the problem is with an output connection. Just find the bad connection by process of elimination.
Contact Kenwood website - usually a malfunction in the unit requiring service, and you cannot reset it. HOWEVER, try the usual unplug, wait and plug-in again. Make sure that there's not a shorted speaker - so unplug all speakers and try using just headphones. Also, make sure you have air ventilation around the unit - nothing on top of it, as that will cause it to overhead and shutdown. Try these items and report back. Good Luck!
It sounds like you have eliminated all the things that could generate this symptom that are external to the amp. It is most likely that there is an internal problem that is causing the amp to go to protection mode. A power supply failure(maybe a fuse) is the only really user serviceable part inside the amp. Perhaps check for failed fuses, replacing any that may have blown with exactly the same type. BE SURE TO UNPLUG AT THE WALL FIRST:)
Is the amp still under warranty? If so, then returning it to a Kenwood service center is the shot. If you want to have a go at repairing it, I can talk you through it, but some experience with this sort of thing is very necessary. Good luck
Same problem here...I determined that if you unplug the receiver for a few hours, it will work again for a week or so. Someone else on this website said that it had something to do with the power relay switch:
When you say the light and the sound goes away after a short time Im thinking that theres a power supply problem as if the fault was in the output or the processor two things wouldnt happen at once. Im thinking if you like the reciver YES to taking it into a repair shop for an estimate, as there are no user replacable or serviceable parts inside this unit. If you can find your owners manual, there is a # or address you can contact to find the closest authorized repair place. Good Luck