Direct pipe inspection Q501 sd1541 (2), find and damage. Carefully check the components associated with repeated loss manager did not see abnormalities, commissioning after a few minutes, touch line output tube temperature is higher, immediately shutdown reason. From the failure phenomenon analysis, is not very serious over-voltage or over-current, by measuring voltage or over voltage phenomena. Test the output pipe line current, found that just boot is 450 ma, slightly on the high side, but will soon rise, analysts say the fault is not line output transformer internal partial short circuit is inadequate incentives. Simple to numerous check line drive circuit element, when the hand touch line drive transformer are temperature anomaly, descending down the drive transformer measurement, about 110 Ω primary resistance, based on past data accumulation. The resistance should be around 150 Ω, doubt promote T502 local internal short circuit of transformer. Since the original replacement, decided to round, apart from the original box phi enameled wire 0.1 mm primary around 1200 turn, subordinated in the original enameled wire around 33 times the left and right sides, after leaching paint dry treatment capacity, troubleshooting.BAJservice manual download site