Question about Sony STR-DE845 Receiver
I have a Sony STR DE 845 receiver with the speaker selector knob (A+B, off, A, B) on the far right side. Recently that switch has shorted out and it has no sound regardless of where the switch is positioned. If you turn the switch very hard to the left (A+B selection) sound will come on as long as you hold the switch, upon release it turns off again.
The unit comes out of protect mode just fine, it appears to simply be a short in the switch. I have removed the front panel and there is approx. 12 points on the circuit. Is there any way to by-pass the switch to operate in a 2 channel mode only?
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Posted on Jan 02, 2017
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Jun 07, 2011 | Sony STR-DE845 Receiver
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Apr 11, 2011 | Sony STR-DE845 Receiver
Generally speaking, an amp protects itself from heat, shorts and overloads.
Overloads can be from excessive periods of high output 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 hands-on tech.
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