Check fuse f801 (2.5A) has been burnt black, and row pipe resistance to ground of 0, off line v405 (2sd1555) test tube collector tube is good, check the line output transformer damage; measuring the power panel switch v806 (2sc4745) 811 (2sa966), push the tube has breakdown, r805 (resistance 2.2 ω) burn open, all of them are new, repair7y3service manual download site