8 May
2002
8 May
'02
11:24 p.m.
----- Original Message -----
From: "Pete Turnbull" <pete(a)dunnington.u-net.com>
To: <classiccmp(a)classiccmp.org>
Sent: Thursday, May 09, 2002 03:22 AM
Subject: Re: IRIX on Personal Iris
On May 9, 0:28, Tony Duell wrote:
Yes, that's the problem I see too. I have confidence in my ability to do
delicate work, but this well take specialized equipment.
> 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...
Indeed it is, and that's what I'd often do, but in this case the DRAMs are
very close together and I don't think it's possible to get even the finest
tip in between, certainly not at the angle needed to get to the pads under
the J-leads.
I used a hot air gun last time -- similar to the type used
for paint stripping or heat-shrink tubing, except that mine is
thermostatically controlled. Use lots of flux, or tiny amounts of fresh
SMD rework solder paste, keep the board level and firmly supported, and
practice on a scrap item first.
D' you think a hairdryer would work? :) Ok, seriously, any problems with
existing parts coming unstuck and getting blown around? Or is the nozzle
tight enough that other chips usually don't get hot enough?
Given the lack of space between the ICs, if you do know someone with a
proper SMD rework station, that would be safer. It's worth mentioning
that
last time I showed this to someone who does this sort
of rework
periodically, the first reaction was a sharp intake of breath!
^_^
--
Pete Peter Turnbull
Bob