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There is a good chance that the output stage (usually an Integrated cct) has been damaged - sometimes one supply fuse failing can cause this effect - checking inside the amp and looking at the main cct board will show some on board fuse (s) and or the main output IC - you could be luck and it is a common type that you can by at your local electronics supply retailer and just replace it - at these low powers the cctry is pretty simple - and simple to fix.
When a fuse keeps blowing suspect an overload in either the power supply section or main amp part.
Look for burnt or damaged parts first.
The suspects in the power section are: transformer, diodes, rectifier, voltage stablizer, regulator.
In the Amp Section anything on the heat sink.
In this case the output transistors are probably shorted. With the unit unplugged, check the pins of the output transistors (center to either outside pin) and if they read shorted, they need to be replaced. It is possible that the previous stage will also have shorted components. If you have no experience with this type of repair, see a service shop. The parts should not exceed $25.
You did not state if your sub is a powered sub or not, but if you use the "B" channel for your sub, it should work. This is possible if the denon will work with "A" channel and 'B" channel on together. The back of the Denon should have two sets of speaker outputs. Connect the "B" channel speaker outputs to the sub. The "A" channel will still drive your 6.5's.
replace all the electrolytic capacitors in the power supply. i had the exact same problem with mine and once i replaced the capacitors it powered up and stayed on and worked perfect. these capacitors tend to fail as they're of poor quality. this fault is very common on denon receivers, especially the later models.
For sure, can at least get an understanding of what may be wrong. You hear the power relay click in, but perhaps no secondary click of the speaker protection relay. This is generally caused by a fault condition in the amp, resulting in a DC offset voltage being present in the speaker outputs, then detected by the protection circuit, does not allow the speakers to be connected to protect them from damage. . How far do you want to get into it?
check all op amps for correct voltage swing +-should be equal,test output of op amps no voltage should be present, use chasis gnd as tester neg.check voltage regulation especially 12v or 15v +-.note some amps show unequal led indications when only 1 channel connected to a load.I will try to get some more info on this specific amp because i don't know this circuit well,keep in touch as you update though.