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

[Doug Browning <dougbrow@freenet.mb.ca>]

There are a number of de-soldering aids available at Radio Shack, such as 
suction devices and desoldering wicks which can be used to make the job 
easier.

Doug Browning
dougbrow@freenet.mb.ca
(formerly: vgt507@freenet.mb.ca)
http://www.winnipeg.freenet.mb.ca/~dougbrow

On Wed, 1 Apr 1998, Ole Voss wrote:

> 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
> 
> 
> 
> 
>