Good Morning Fabio,
I have carried out the tests to the U640 as you suggested for both the A trigger and the B trigger here are the results
A TRIG
14/15 20.4 mv
2/3 -7.9 volts !!!!!!!!!??????
B TRIG
14/15 100.7 mv
2/3 42.6 mv
I noticed that all of the voltage tests in the Service Manual are carried out with the NORM button pushed, so the tests above had the NORM button in.
I think I may have a problem with the FET's ??
Thanks for all the help
John
