Mac Classic - almost dead

From: Wayne M. Smith <wmsmith_at_earthlink.net>
Date: Mon May 13 23:37:35 2002

> > I turned on my Mac Classic today and found it was almost dead.
"Almost"
>
> Mono or Colour? If the latter, then you might be hearing the
degaussing
> coil (which runs straight off the mains), so the PSU might not be
> starting at all.
>
> > because I can hear the smallest bit of CRT near-ultrasonic buzz --
just
> > for a second -- and then nothing. I'm hoping it's just a fuse --
any
> > ideas?
>
> If the fuse has blown, then there's a good reason for it (shorted
> semiconductors in the mains side of the PSU?). But check it anyway.
>
> Then see if any of the DC outputs from the PSU are pressent (check the
> +5V line at the power pins of just about any chip on the logic board,
for
> example). If not, then you've got a PSU problem. It doesn't sound like
a
> short on one of the outputs (this will normally make the PSU 'tweet'
as
> it starts up, detects the problem, and shuts down again). Maybe the
> startup resistor is open.
>
> -tony
>
Thanks, Tony. I'll check these out right after I check the PRAM
battery. It is Colo[u]r.

-W
Received on Mon May 13 2002 - 23:37:35 BST