Subj : Re: Powering up 28s and 64s that have been in storage for at least a de
To   : Kenzo
From : Computer Nerd Kev
Date : Fri Apr 29 2022 09:06 am

Kenzo <[email protected]> wrote:
>
> For the 128 and 64 computers, should I power them up with low
> voltage on a variac for a while before giving them the full 120v?
> The idea being to perhaps give the old caps a better chance of
> surviving powerup after long storage?
>
> Or would low voltage give the power supplies and internals problems?

It should be OK so long as you don't connect any externally-powered
accessories such as a disk drive when they're under test, in which
case the voltage difference between the different devices could
cause damage in various ways.

Usually that technique is used with equipment with higher internal
voltages though, I'm not sure whether it will prevent much in this
case where the difference is only a handful of volts.

> I will have a dim bulb tester in series also in case their are
> any serious problems with the units.

That should only be needed for the power supplies themselves, as
the voltage regulator inside the PSU should limit the current to
the computer if something inside draws way too much power.
Furthermore I'd suggest you check the PSUs separately from the
computers, and always test the computers with a known good PSU.

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