Look around the site and the environment correctly, suspect may have external high voltage pulse interference exists. Then try changing the environment and conditions for testing. "Glitch" still. The power amplifier itself does have "failed" hidden dangers exist. According to the regular procedure. Measuring amplifier 38V supply voltage.SWqservice manual download site
Symmetrical and stable supply voltage. AC ripple disturbances in the normal range. Check the ground wire into nor Dianyuan power ground and signal ground mix. Measuring NJMll03 around channel output signal, appropriate zoom voice Shi appeared miscellaneous wave interference, so preliminary suspected NJM1103 and perimeter related components may exists de welding phenomenon, first with no water alcohol will NJM1103 each introduction feet welding points cleaning clean, found some introduction feet of welding points loose, and not smooth, individual welding feet eat Tin volume too little, try will above related feet bit again fill welding solid Hou access circuit. Power up test machine, noise elimination.SWqservice manual download site