On Thu, Aug 1, 2019 at 06:48 PM, <twincam18@...> wrote:
I have checked the voltages that come into to the deflection amplifier/high
voltage board. There is a 200v+, 30v-, 30v+. 5v+ and they are all right on the
dot. I have done a quick visual inspection and esr readings on most the
capacitors and so far I am not seeing anything.
Any help or just ideas of what I should check would be greatly appreciated!
Unlike the 576 Test Fixtue the 577 Test Fixture (177) is not passive i.e it has a
pre amp. If the input FET get busted it will send the beam off screen. I've seen
this happen several times.
If my memory is correct this could happen due to arcing in the Looping Compensation
variable cap when the Collector Supply is set to its max (> 1600V) and the Vertical Current/div
is set to a low current.
So checking the output from the 177 would be a good place to start.
/H?kan
zenith5106