BV 25 when switched on, its normal. manualy High low Kvs are slected no error shows, but when pressed hand or foot switch there is no expose, no HT, no signals at rectifier stages, checked all outputs from transformers, all were normal as 220ACV , 594ACV, 28ACV, 18ACV, , i checked hand switch its working, (15V on off ) but high voltages which are present at (SE 35) V1.V2,V3,V4 but not going out , but there is no RECT TR signal for gate operation.. any one can help plz... sunnytek_ engr@yahoo.com