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Does anyone happen to know how to unlock the protection circuit on the Yamaha WXA 50 amp?  Mine has locked up presumably because of overheating on a couple of occasions, have not been able to find out how to reset it, not even in the Service manual.  I can still run self-diagnostics via browser interface but the thing turns itself off within 3 seconds. Cheers.

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Thanks, but factory reset does not do it.  The protection circuit prevents it from running. 

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