cwilbar
Well-known member
So, I have this Tempst PCB set I'm working on. At least one pokey bad, one of the TL082 for the X output was bad, resistor for y size snapped in half. I've replaced the MC1495Ls for XCOR and the Y output, but I don't think they were actually bad.
What is happening is the left third of the screen is keystoned (vertical height squished on the left margin, and by about 1/3rd of the screen, is normal).
I have only worked on a few Tempest analog outputs previously and have not encountered this issue.
Best I could tell with my scope (which due to the smaller screen and age of the scope does not show the problem as clearly) was that the output of the 2 op-amps (in the same chip) after the MC1495L seem to also show the distortion on the scope (as best I can tell).
Could this be from that op-amp ?
Hoping someone has seen this before, as I don't like replacing good parts (shotgunning).
Thanks for any hints/tips/solutions/etc you can provide.
What is happening is the left third of the screen is keystoned (vertical height squished on the left margin, and by about 1/3rd of the screen, is normal).
I have only worked on a few Tempest analog outputs previously and have not encountered this issue.
Best I could tell with my scope (which due to the smaller screen and age of the scope does not show the problem as clearly) was that the output of the 2 op-amps (in the same chip) after the MC1495L seem to also show the distortion on the scope (as best I can tell).
Could this be from that op-amp ?
Hoping someone has seen this before, as I don't like replacing good parts (shotgunning).
Thanks for any hints/tips/solutions/etc you can provide.

