Peter, thank you for the reply! i had to wait a bit for it to get dark
enough, but i just checked and i could not see any visible arcing inside
the chassis when the terminal is powered on. there is a slight buzzing
noise coming from the problem area but i suspect that is normal.
i did notice something new and potentially enlightening though, this time
when i turned the terminal on i could see several lines stretching
diagonally across the screen that were not there before. i also checked the
transformer(?) above the power distribution board while the unit was
powered on, it does not seem to be overheating.
On Tue, Dec 20, 2022 at 1:09 PM Peter Coghlan via cctalk <
cctalk@classiccmp.org> wrote:
> I had something similar with a VT220. I didn't get around to
> investigating it
> before the flyback transformer failed :-(
>
> I can only suggest to run it for a short time with the cover off and the
> lights
> out while looking for any glows / discharges around the flyback
> transformer,
> the EHT cable, the EHT connector on the tube and the tube base connector.
>
> Regards,
> Peter Coghlan.
>
> Ps: Anyone got a flyback transformer for a VT220?
>
> >
> > i have a VT100 that is working fine (powers on, navigates setup,
> > saves/restores settings, etc) but has an unpleasant burning/ozone odor
> > coming from the rear of it. i suspect something is running hot but i am
> not
> > sure what, i do not currently have an IR camera in my hands- working on
> > that. the original power supply has failed and is currently in storage,
> so
> > the terminal is being powered by an ATX power supply and adapter board
> for
> > the time being. this eliminates the usual R27 as being the culprit.
> >
> > as best i can tell, the smell is strongest just above the power
> > distribution board, around the neck of the CRT. appreciate any
> suggestions
> > you might have!
>
