Bad K3, R3 or T2 first, C2 secondary open circuit, open circuit failure or reduced capacity, C3 breakdown leakage or open circuit failure, flash tube damage. T2 can use the original core coil, the primary use, 0.22mm enameled wire around 18 ~ 22 turns, the secondary use, 0.08mm enameled wire winding 600 turns. Can also be a common recorder magnetic bias coil as a secondary, 20 primary winding turns on, the 0.22mm enameled wire.Fnuservice manual download site