I have an AVR-2803.. recently, it has developed a problem.. sound cuts off after 1-2hrs of continuous operation.. some slight tweaking on the "input selection" will somewhat bring the sound back on... please help - thanks (Alex)
Audio Players & Recorders - Denon - AVR-2803 Receiver
Answers & Comments
Heat.
Generally speaking, an amp protects itself from heat, shorts and overloads.
Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.
I can't tell you how to fix a discrete component inside it but I imagine you might be able to detect the source of the alien abduction sound with the case off. Not that it would be the root cause of the failure, mind you. Keep a fire extinguisher handy.
Could be just a blown capacitor, but to replace it without knowing why mght not be wise.