Mine did same thing-when I put on my strongest reading glasses,I discovered ONE STRAND! of speaker cable was touching (-) speaker output terminal....felt like a fool....Worth taking a second look! [email protected]
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When a system shuts down after a few seconds it is the self protect circuit shutting down power to the outputs to prevent (further) damage. It may be caused by frayed speaker wires, bad speaker voice coils, or blown output transistors. First, turn off power and remove all speaker wires from the receiver. Turn it back on and see if the problem remains. If it works OK, inspect each speaker wire at both ends for loose strands and correct these. Then, hook up your speakers one at a time until the problem reappears. That speaker or its' wiring is your problem. For safety's sake. turn the receiver off before connecting each speaker. An accidental short of the output terminals can be disastrous (and expensive).
This is the overload protection circuit. Make sure not alot of dust build up inside and make sure no speaker connections are touching. Most likely being that it a sherwood you will want to consider replacement. Thank you, Lee
Protection circuit turns off the unit because of critical conditions- wrong power supply voltages or one of the power amplifier channels is bad. First, visual inspect the power amp board near the heat sink for burned resistors, test outputs for a short. If there are no problem you may try to turn the unit on and you have several second before it shuts down to check power supply voltages and power amp output voltages and bias, then ... Long story you'd better take it to a repair shop or repair at ebcelectronics.com
There is some leakage of DC voltage getting to the output section. DC voltage will cause the protection circuit to kick in and shut down the amp. This should be a relatively simple repair and cost about $15-$30 in parts plus the local labor rate.