Check with a multimeter the black flex cable from the high voltage board that goes directly to the display board and check if you ar getting all the voltages correctly, that model has a labeled PBC so you can be sure, especially the -30v
that voltage comes from the transformer, the orages/white/gray secondary cables check it too
Not sure - just make sure the tape player button is not pressed.
Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Check for loose speaker connections as a root cause for intermittent shutdown.
http://www.retrevo.com/support/Sherwood-RD-6108-Receivers-manual/id/516ci958/t/2/
My preference is to send the BEST version of any medium (audio or video) directly from it's original source to the BEST ELECTRONICS that uses it; then send minimalist versions across for convenience and lo-fi watching/listening.
Any self-respecting modern TV has multiple hi-def video inputs, so run the Bluray, DVD, cable box video straight in and run the audio from those devices to the Sherwood.
Fewer expensive cables, no excessive connections to go bad, no unnecessary handling of the material.
I'm pleased to see the manual for this one (and the product's limited video capabilities) don't tempt the user to route everything through it on the way to the TV.
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I have the same problem with mine the display does not light up and only the tone direct light and the main power light come on. When I have the main power on and try to push any of the input buttons it turns off completely.
whats the tape player button, where is it located?
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