Cannot boot measured voltage B1 only 26V. For such a failure, the component replacement repair, first off overvoltage protection thyristor v819 (sfdr1b42), and substitution electrolytic capacitor c814 (47u/50v), c817 (1u/50v), c820 (4.7u/50v) is invalid, the feedback diode v807, v808, v809 (s5295g) with 1N4148 substitution, the feedback capacitor (0.47u/50v), c813 pulsed triode v811 (2sa966), v812 (2SC1959) and a sampling amplifier tube v813 (2sa1015) are good element substitution, still invalid, when replacing the feedback capacitor c818 sampling part (2400p/100v), normal voltage B1 output 115V, re protection circuit, multiple boot, B1 output 115V voltage, normal so far, troubleshooting. After the digital meter measuring capacity did not decrease, when the electric iron heating immediately after no capacity.XAPservice manual download site