19 Jun
2009
19 Jun
'09
11:56 p.m.
On Jun 20, 2009, at 1:13 AM, Josh Dersch wrote:
Decided to dig out my IBM 5120 and try to get its
monitor working,
at long last. It's a Ball TV-90. Anyone out there have the
service manual for this? (Worst case, there's a copy on eBay right
now, but before I go through that I thought I'd bug you guys...)
I mentioned this issue a few years ago, here's a photo of the
interesting distortion I'm getting: http://yahozna.dyndns.org/
scratch/5120disp.jpg. Thus far I've done a complete cap kit with
no effect. I hate working on monitors, but I really want to get
this running again...
Wow that's a bizarre distortion. I'd love to see the horizontal
drive waveform on an oscilloscope. It almost looks like it might be
some sort of zero-crossing distortion in an amplifier.
-Dave
--
Dave McGuire
Port Charlotte, FL