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As always with stereo amps the two channels are identical, so if one goes wrong you have the other as a control for testing purposes. So if you start by looking and comparing the two channels. that's a start! If a part looks odd on the faulty channel, but is fine on the good channel you have found the problem. You can also do tests, such as touching the two channels with an insulated screwdriver, while powered up. If it buzzers on the good channel, it should buzz on the other channel at that point. Keep away from the power supply and ignore anything that is on it's own, that has no duplicate, or is common to both channels.
Hi, try powering up the unit with out any speaker connected if it still goes to PROTECT try factory reset if possible.
To reset the AV receiver to its factory defaults, turn it on and, while holding down VCR/DVR, press ON/STANDBY. "Clear" will appear on the display and the AV receiver will enter standby mode.
If this does not fix your problem you should take your unit to service . :)
If all the speakers are connected properly then I would say, there is a failure in either the power supply filtering caps or one output has failed and it's going into Protect mode to keep from frying the speakers
It will require service at that point.
Most new stuff has the fuse/fuses mounted in clips on the power supply board. If yours is anything like the one a picked up for one of my bands, you can take the bottom plate off and see everything inside. Look for where the AC cord goes after the power switch. There should be a circuit board with a fuse or 2 mounted on it
These things are a *****, but. Check the electrolytics on the circuit brd. Adcoms are know for this problem. When they leak, they destroy transistors that the electrolite gets into. If the circuit board looks wet, them kiss it goodbye. Etches get eaten up and generally make the amp a brick. Adcom doesn't have replacement circuit boards Check all the fuses on the back panel too.. When something bad happens to these they also burn up a lot of ten ohm resistors on the heat sink boards. I may be able to provide a pdf on this unit.
First, perform a visual inspection at the back of the unit and verify that speaker wires are not loose or shorting out with another connection. Find the impedance selector switch and verify that it is set to the proper position according to your speakers' impedance. It has to be all the way up or down, never in the middle. (Warning: Do not move the impedance selector while the receiver is powered. Make sure power is OFF on in standby, otherwise receiver will be damaged). Try power ON.
If these actions do not cure the problem, disconnect all speakers and try power ON again. If the unit powers on, it is possible that one or more of your speakers or wires are damaged. If none of the above actions fixes the problem, it is very possible that the receiver's internal circuitry is damaged.