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Re: Powering off by it's self...
It sounds like an overload/no load problem. Are ALL the speakers connected? to the right places? If the amplifier section doesnt "See" what it needs, it will shut off. If all connections are good and it shuts off still take it to a tech who knows stereo. Doesnt have to be an authorized HK guy either
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There could be a short circuit in one of the speakers. This would cause high current flow thru the amplifier and result in self-protect. Disconnect all speakers from the unit and try powering up again. If there is no PROT, then reconnect speakers one by one until fault found or all speakers are reconnected.
I have found there are capacitors failing through the output circuit. Look for 10, 33, 47, etc.. microfarads.In that range. I charge typicaly 150 to $200 with parts on something like this. Larry's Electronics firstname.lastname@example.org
Sounds like either the volume is turned up too loud, or you have a short. Have you tried disconnecting all the speaker leads from the rear, and then powering it on? Usually if it turns on for a short time and then shuts off, it is throwing itself into protection mode.
The space you have provided should be enough. If this is a new unit and still under warranty, I would request warranty service. It sounds like the unit is entering protect mode. This may be due to heat or it could be because of a defect in the protect circuit. In any case, this should not happen that quickly.
Update this if not under warranty and I'll provide a list of diagnostic tests to help determine the problem.
I have a Teac ag-7700 and when I would try to power it on it would shut off. I did get it to turn on for about 10 minutes and then it shut off. Now when I try to power it on the light on volume dial stays lit but the LED does not light up and no sound through speakers.
The Sherwood R-945 has at least 6 fuses inside - any one of them could keep the system from powering on properly. The lowest power fuse is rated at only 35 MILIamps, I believe ( it's element is barely visible to the naked eye ). Check that all fuses are intact (with the power off)
My R-945 unit kept shutting itself off directly after powering up - turned out that one of the speaker wires had a fault - (found after hours searching with voltmeter). Check that all Inputs / Outputs are secure.