Mac Plus ozone?

[Tony Duell]

> 
> 
> I was given a Mac Plus a while back... and never tested it....
> 
> Decided to give it a quick test...
> 
> Other than needing a boot floppy which I'll have to dig up.... it powers 
> on, video
> looks good, monitor is stable and all...
> 
> But there is a faint sound (think of it as a cross between crickets 
> chirping and clicks)
> and after a while, it smells to me a bit like ozone at the top of the Mac. 
> 
> I'm thinking maybe high voltage leakage ?

I'm thinking the same thing. 

WHat _I_ would do is pull the case (we've had a discussion on opening 
classic Macs recently) and the cardboard cover over the 
vertically-mounted 'analogue board' (PSU and monitor circuits). Then 
power the machine up -- touch _NOTHING_ inside -- and if possible darken 
the room. Look for sparking, corona discharge, and the like.

It might be leackage from the flyback transformer, for example.

-tony