[rescue] Sun 3/50 scsi boot string

[Kurt Nowak]

Good advice. Yeah, we aren't dealing with an old radio here. I'll
definitely recap the thing before putting power to it again. Thanks
everyone.
-Kurt

On Wed, Dec 28, 2022 at 5:19 PM Dave McGuire <mcguire at neurotica.com> wrote:

>    Yes, definitely.  We have a replace-on-sight rule here for Rifa X-
> and Y- class capacitors.
>
>              -Dave
>
> On 12/28/22 17:58, John Hudak via rescue wrote:
> > If you are serious about having a serviceable unit,B  and minimize the
> > risk of the PS taking out critical components on the MB (or elsewhere)
> > ust recap the PS.B  ESR caps have come a long way since the late
> > 90s/early 2000's.B  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.
> > J
> >
> >
> > On Wed, Dec 28, 2022 at 3:14 PM Jerry Weiss via rescue
> > <rescue at sunhelp.org <mailto:rescue at sunhelp.org>> wrote:
> >
> >
> >     On 12/28/22 1:35 PM, Dave McGuire wrote:
> >>     On 12/28/22 11:42, Kurt Nowak via rescue wrote:
> >>>     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.
> >>
> >>     B  That's a switching power supply; it will not play nice with a
> >>     Variac!
> >>
> >>     B B B B B B B B B B B B  -Dave
> >>
> >
> >     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.B  Repeat the process a few
> >     times and slowing increase the on time.B B  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.B  If the capacitor has dried out or doesn't
> >     survive the initial start-cycles then you are SOL.B  Use at your own
> >     risk.
> >
> >      B  Jerry
> >
> >     _______________________________________________
> >     rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
> >     <http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org>
> >
> >
> > _______________________________________________
> > rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
>
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