<div dir="ltr"><div>If you are serious about having a serviceable unit, and minimize the risk of the PS taking out critical components on the MB (or elsewhere) ust recap the PS. ESR caps have come a long way since the late 90s/early 2000's. IMHO, if any gear has RIFAs that are more than20-25 yo, replace them before turning it on. No sense screwing around with iffy old components.</div><div>J</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Dec 28, 2022 at 3:14 PM Jerry Weiss via rescue <<a href="mailto:rescue@sunhelp.org">rescue@sunhelp.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<br>
<div>On 12/28/22 1:35 PM, Dave McGuire
wrote:<br>
</div>
<blockquote type="cite">On
12/28/22 11:42, Kurt Nowak via rescue wrote:
<br>
<blockquote type="cite">I have not yet taken the PS apart yet, so
I haven'tB had a visual inspection yet and whether it has RIFAs.
Either way,B I'm not going to fire it up withoutB my current
limitingB dim-bulb tester, Variac and Isolation Xformer.
Unfortunately the lettering on the PS is starting to disappearB
and cleaning the input side will most likely erase it all. I
think I saw a section in the FE manual that has a rough
description of it. The unit is at another location for storage
so I'll have to take sections of it apart to move it by myself
without breaking my back. Too many other projects going on at
the moment.
<br>
</blockquote>
<br>
That's a switching power supply; it will not play nice with a
Variac!
<br>
<br>
-Dave
<br>
<br>
</blockquote>
<br>
My own method for vintage electronics with switching power supplies
is to turn on the device for less than one minute, then leave it
alone for a 3-5 multiple of the on-time. Repeat the process a few
times and slowing increase the on time. The concept is to briefly
charge the electrolytic capacitors, but don't stress them too long.
This may give them chance to reform their insulating layer and
endure longer on-times. If the capacitor has dried out or doesn't
survive the initial start-cycles then you are SOL. Use at your own
risk.<br>
<br>
Jerry<br>
<br>
</div>
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</blockquote></div>