Re: IT LIVES!!!!!!!!!!!!!!!!!!!!!!!!

Try DeoxIT, formulated for this exact purpose. Mike

On Feb 13, 2:40 pm, James MacPhail <g..._at_email.domain.hidden> wrote:
> >... it powers now!!!!!!
>
> Congratulations on your progress so far!
>
> > It has the bad i/o board message with a 50 below it.  What
> >does that mean?
>
> Although a VIA (or associated electronics) could be bad as suggested by the
> error, my experience in recent years is that self-test errors and other
> problems are usually due to oxidized/corroded/poor contacts.
>
> Hence this suggestion:
>
> Remove the cards from the card cage, and clean all of the edge connectors
> with ~99% isopropyl alcohol (available at your pharmacy).
>
> Any fingers that have substantial discolouration or corrosion might need
> something more aggressive, such as using a soft pencil eraser (but be
> gentle as the gold plating is easy to erase!)
>
> Before putting the cards back in, inspect the sockets for corrosion or bent
> contacts. These can be cleaned with alcohol too, using a soft cloth wrapped
> around a piece of thin cardboard -- be sure to wipe "in and out" only,
> don't wipe sideways or the contacts may be bent out of shape.
>
> Then partially insert each card by itself, and look for any contacts in the
> connector that are inconsistent with the rest. These may have been broken
> or bent and in need of repair.
>
> For final assembly, I wipe the cardedge connectors with an electroniccontact cleanerthat contains silicone; this provides a barrier to reduce
> future oxidation, and acts as a lubricant which reduces wear on the gold
> plating.
>
> When inserting the cards for reassembly, install and remove them a few
> times to 'wipe' the contacts. This helps to break through any remaining
> oxide and help everything seat properly.
>
> If the problem persists, sometimes just performing the last "wiping"
> procedure will resolve it.
>
> The component sockets can have a similar problem, but this seems to be less
> common. If oxidation is obvious, cleaning the component legs with a pencil
> eraser seems to work, but you need to support the legs so they don't suffer
> any stress. If a component socket is bad, I would replace it with a new
> AMP/Tyco Dual Leaf socket, or a machined contact socket with gold inserts.
>
> HTH,
>
> James
>
> James MacPhail                   "Think not of engineering as art,
> uo..._at_email.domain.hidden                 but of art as engineering"
> Sigma Seven Systems Ltd.
> ja..._at_email.domain.hidden        <http://SigmaSevenSystems.com>

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