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Receiver shutting down during high loads

I have a UK made Sherwood Newcastle R-925 receiver that recently started shutting down in surround modes (Dolby Digital and Pro Logic just for testing purposes) under high loads. It worked fine for years and now a gunshot, scream, etc seems to overload the system causing shutdown. As I am not a technician, what could be the problem? I like this unit and would like to have it repaired, but I'm not sure how pricey it may be...
donaldjstewart
elizabeth
6,726 posts
 
If this is a new problem, I would 'guess' at a capacitor or several are damaged from age.
Replacing all the 'big' caps in it would do the job of making it as good as new.
(under $100, and if you can do it yourself solder decently, under $35.)
Nearly ALL problems with older amplifier stuff starts with bad capacitors.
elevick
2,439 posts
 
Have you changed speakers?
Is this a 22volt unit that has been converted to 110v?
Are you using a transformer to convert it to 110?
Many speakers' impedance will drop when pushed hard. If your nominal impedance is dropping from 8 ohms to 5 or 6, that could be why???
Otherwise, check for a mild short in the speaker cables. At low loads, the system can operate but as voltage increases...
donaldjstewart OP
4 posts
 
Thanks! and as far as me soldering decently, ha ha... I guess I better learn so I can take care of my own stuff.
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