Well Success at last Fabio !!!!!
I did not realize that the FET's were in sockets under the heatsinks, I decided to change them and I still had no Trigger, as they were out I tested the FETt's on my component tester and there was one faulty on the B TRIG and one on the A TRIG so I used the good ones on Trig A and found that as I turned the Trigger Level control to about 3 o'clock it locked and I had Trigger sync, and the trigger lamp is on. The voltages on the U640 chip 14/15 is 0v but 2/3 is 179 mv I have had a look around and have not found the reason for this ?
Have you any thoughts for a suitable replacement for the FET's?, something I might get locally in UK
We are getting there thanks to you
John
