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Db751 issue

I have a problem with my DB751.After the 45 sec.blinking diagnostic light stops blinking and I push operate,nothing happens for about 5 minutes,then it worked properly,and continued to until another period of non use.Now the same thing is happening.Its in the shop now.Any ideas?relay?The pre and power seem to be coming on,just no sound.

By the time it was 2 mosfet crashed but no root cause founded.
For sure, send it to a repairshop before any smoke is a good idea
 
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