Re: help replacing Ram Chips on an Apple //e

[Ole Voss <joker@on-line.de>]

It really isn't that much work desoldering them, and doing the piggy-back job only
seldomly works.
Just put on more solder first then let it get a little warm and finally suck it
all out. You'll
notice that old solder is difficult to liquify - that's why you should add some
first and then
remove it all together.

Ole



Rubywand wrote:

> Supertimer writes ...
> >
> > "Candace Richardson" <puguaman@yahoo.com> wrote:
> >
> > >I have an Apple //e that was diagnosed as having Bad ram on the
> > >motherboard. I got replacements for it, but how do I change the chips? do
> > >they just pop out? It's hard getting them out, and I am tempted to use some
> > >pliers but I don't want to damage anything. Some UN-soldering perhaps?
> > >Please help. Thanks
> >
> > They are soldered in...
> >
>
>      Bad news!
>
> > One trick to repair the IIe without knowing how to solder is to piggyback
> > the new chip on the bad one. ....
> >
> > I once fixed a IIe with 2 bad RAM chips this way and it worked for six
> > years before something else broke...
>
>      Kind of neat! However, there are a few possible problems with this
> approach. One is that Candace can not be sure that her bad mem IC's
> failed as politely as yours. For instance, suppose a bad chip is locked
> into outputting O on a Data line. A piggy-backed IC would be battling
> the bad IC when it wanted to output a 1.
>
>      Then, too, we do not know which, if any, mem IC's are bad.
> Piggybacking eight 16-pin IC's is a fair piece of work. It is not that
> much more trouble to de-solder the IC's, use solder wick to open up the
> holes, and install 16-pin sockets.
>
>
> Rubywand