[sdiy] Debugging problem with 4-track

Corey K coreyker at gmail.com
Sat May 26 12:25:29 CEST 2018


That's interesting, because I've read in several different places that
electrolytic capacitors dry out after 20 to 30 years, and often need
replacing. Is that false?

On Sat, May 26, 2018, 05:13 Gordonjcp <gordonjcp at gjcp.net> wrote:

> On Fri, May 25, 2018 at 08:23:17PM -0230, Corey K wrote:
> >
> > What might be happening here? I'd love to hear any hypotheses. Seems
> like a
> > problem with the power distribution system, but what would be the first
> > things to check? (I have a multimeter and scope). Is this a case that
> might
> > require recapping? What would be the best way to investigate this? Any
> > ideas would be much appreciated.
>
> Nothing ever requires "re-capping", *ever*.  It's a good way to make
> things worse.
>
> It doesn't look like there are any service manuals readily available,
> which is annoying.  At least the power input circuitry ought to be easy
> enough to trace out.  If it works okay with a lower supply voltage that
> makes me wonder if one of the voltage regulators has failed.  If it's
> one of the three-terminal types, then if the ground pin has a dry joint
> (they're linked to the heatsink tab and so get hottest) that would cause
> it to stop regulating.
>
> --
> Gordonjcp
>
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