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HI, Fist of all you have to disconnect all the speakers From AVR. Then
switch ON the AVR . If its working normally then any of the speaker or
any of the wire to the speaker is faulty. If so connect the speaker back
one by one and check on which speaker connection does the AVR shuts
off. That speaker or the wire to the speaker is faulty.
If the AVR is not functioning properly even after removing the
speakers(shuts off) then there is internal fault with the amplifiers
stage. Normally Dry soldering on the amplifier circuit board or any of the output stage is faulty. To rectify the same need professional support.
Did you checked balanced impedance?load speaker impedance vs PA output?or PA might over driven,causing a trouble on the pre-amp to power amp circuits and components damage,
need to recheck related components on the pre-driver up to main output section,
Note: That,blowing of fuses with the same rating is an indication of trouble/shorted in a circuits that driven on it,
Please see the link below for an explanation of Protect mode. Specific to your model, the output transistors are likely to be shorted. This particular model will shutdown the entire unit if any of the channels have a problem. Without actually seeing the unit and taking some internal measurements, I cannot state for sure the parts required for repair. I would expect a parts cost in the $20-$40 range minimum.
HI , just found your post . I also have just picked up a denon DAP-2500 pre and 2 POA 4400 amps with klipsch belles, having same probs with power balance i followed some helpfull advise and deoxidized all rca jacks speaker terminals ect. also i opened the pre amp and cleand it even though it was fairly clean, i used cleaner on all switches and volume controll's . WOW I could hear it nice and clean . Next i will clean the amps. hope this works for you as this is great equpment well worth saving.
THe click you would hear is the speaker relay turning on the speakers. If a problem is detected in the amplifier seciton, the relay will not engage. This is often called protect mode and is done to prevent damage to either the speakers or the amp itself. If I remember correctly, these units have discrete transistor outputs and can easily be repaired. These are not the easiest for access however. I would suggest a trip to the repair shop for this one. Expect a parts cost in the $40 range.
Blingking Light or Protect usually means that there is DC appearing in output stage and is protecting Connected Speakers. It can be faulty Output Stage (Bad ICs/Transistors/Resistors/Capacitors) or Faulty Power Supply.
Working on These types of Problem is not user friendly at all.
1-check sound input source(dvd -tuner-deck)and confirm that amplifier is assigned to sound source-you must check source with it is cabels. 2-check sound output with it is cabels(speakers). 3-if every thing is fine your amp has a problem and needs to go to service center.