31 Aug
2003
31 Aug
'03
10:44 a.m.
I have now dug out the H89 scehamtic. Well, it actually claims to be the
Zenith Z89/90 schemaitc. but AFAIK they're the same thing.
> properly sized, and stable. After the unit
operates for 10-15 minutes, the
> video breaks down, first by jittering slightly for 30-60 seconds, then it
> goes to a single vertical line on screen that fades to black. At this time,
> the filament on the CRT also stops glowing. If I leave the unit off for
> 20-30 minutes, it comes back with good video for a bit, then repeats the
> above. If I turn the unit back on right away without a cool down, there's
> no display/no filament glow.