Report "I have 1200 watts powered mixer 12 channel tsunami brand" korea made.When it turns ON" only monitor spkr output is working" the mains spkr output doesn't work but the signal from it is working" no sounds coming out" I try increasing the volume, then sounds come out" after 5 to 10 minutes it goes back the problem, stop the mains spkr and monitor alone is working". It has 2 cooling fans but 1 doesn't work"