Service Manual for Ball TV-90 monitor?
mcguire at neurotica.com
Sat Jun 20 01:56:30 CDT 2009
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.
Port Charlotte, FL
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