My Denon AVC-1580 keeps shutting off-blinking red light ...what would be the possible cause of this? I already remove the speakers but the problem still exist I already do reseting and the same result the problem not fix.
SInce it happens without speakers connected I would also try disconnecting all the other wires just in case.
The problem is likely internal. If you feel you can work on it here is the service manual https/www.hifiengine.com/manual_library/denon/avc-1580.shtml
Given the age and lack of modern features I would not put much money into it.