----- Original Message -----
From: "Tony Duell" <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, May 08, 2002 07:28 PM
Subject: Re: IRIX on Personal Iris
> > > To upgrade Indigo 4MB SIMMs, you need to find eight 514400 (or
equivalent)
> > > 80ns DRAMs in 26/20-pin SOJ package, and eight SMD decoupling
capacitors
> > > (sorry, don't remember the value but such caps are usually about
> > > 100-200nF). The capacitors are fitted in positions marked C3, C4, C8,
C9,
> > > C12, C13, C17, C18 on the DRAM side, before the DRAMs (which cover
them).
> >
> > Sounds easy enough. Now all I need to do is find someone with an SMD
rework
> > station. ^_^ This'd be a good time to see about upgrading my
SPARCBook2 to
>
> For something like this you could probably use a fine-tipped soldering
> iron and fine silver-loaded solder. You'll have to work slowly and
> carefully, but SMD soldering is possible with normal hand tools...
The next time I have the 4D/35 open, I'll pull a SIMM and stare at it for a
while. If it's just the fine pitch of the leads I feel pretty confident,
but the chip spacing on the SB2 CPU board is on the order of .5 mm. I don't
think I can get a soldering iron onto the bottom of the j-leads in between
the chips.
>
> There's an article in this month's Circuit Cellar (is there anyone here
> who _doesn't_ read that?) on doing SMD rework (removing and replacing a
> TQFP chip) using a soldering iron, etc. The methods described are roughly
> what I use, and they do work (no I am not claiming I invented them -- I
> read about them somewhere, but I've forgotten where. I am certainly not
> claiming that the author of this article has 'stolen my ideas').
I'll look it up.
>
> -tony
Bob
Received on Wed May 08 2002 - 20:13:19 BST