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RE: --desoldering ic's?

1999-07-30 by Dave Bradley

At a minimum, you've got to have a manual solder sucker. It's a hand held
plunger-loaded doodad that creates a vacuum when you release the plunger,
sucking up solder that you have just reheated with your soldering gun. It
works OK for ICs without a large number of pins.

If its a cheapie opamp, sometimes I just clip the pins on the top edge and
remove them individually. It's harder to fix a board that you have lifted
pads or traces on, than it is to replace an inexpensive IC.

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

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> -----Original Message-----
> From: hodad1@... [mailto:hodad1@...]
> Sent: Friday, July 30, 1999 3:34 PM
> To: motm@onelist.com
> Subject: Re: [motm] --desoldering ic's?
>
>
> From: hodad1@...
>
>
> It hasn't happened to me yet, but it probably will eventually--if I solder
> an ic in backwards
> or blow one up, is there a recommended technique for getting those little
> suckers out?
> --Short of a desoldering station, that is.
>
> tomr
>
>
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RE: --desoldering ic's?

1999-07-30 by David Bivins

I have a hard time with my solder sucker and prefer to use braided solder
wick for ICs. If you lay the wick across several pins at once and quickly
place the iron tip flat against the board, you can take up a great deal of
solder in very little time (which is key to not frying the IC!).

Then again, I'm an amateur, but this has worked well for me on other
projects and I haven't messed up an IC yet.

David.

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> -----Original Message-----
> From: Dave Bradley [mailto:daveb@...]
> Sent: Friday, July 30, 1999 4:18 PM
> To: motm@onelist.com
> Subject: RE: [motm] --desoldering ic's?
>
>
> From: "Dave Bradley" <daveb@...>
>
> At a minimum, you've got to have a manual solder sucker. It's a hand held
> plunger-loaded doodad that creates a vacuum when you release the plunger,
> sucking up solder that you have just reheated with your soldering gun. It
> works OK for ICs without a large number of pins.
>
> If its a cheapie opamp, sometimes I just clip the pins on the top edge and
> remove them individually. It's harder to fix a board that you have lifted
> pads or traces on, than it is to replace an inexpensive IC.
>
> Dave Bradley
> Principal Software Engineer
> Engineering Animation, Inc.
> daveb@...
>
> > -----Original Message-----
> > From: hodad1@... [mailto:hodad1@...]
> > Sent: Friday, July 30, 1999 3:34 PM
> > To: motm@onelist.com
> > Subject: Re: [motm] --desoldering ic's?
> >
> >
> > From: hodad1@...
> >
> >
> > It hasn't happened to me yet, but it probably will
> eventually--if I solder
> > an ic in backwards
> > or blow one up, is there a recommended technique for getting
> those little
> > suckers out?
> > --Short of a desoldering station, that is.
> >
> > tomr
> >
> >
> > --------------------------- ONElist Sponsor ----------------------------
> >
> > Transfer your big list to ONElist and earn $500!
> > For program details, go to
> > http://www.onelist.com/info/biglistbon_intro.html
> >
> > ------------------------------------------------------------------------
> >
>
>
> --------------------------- ONElist Sponsor ----------------------------
>
> Congratulations to MICHELLE UNSER
> This week\ufffds FRIENDS&FAMILY WINNER!
> To enter go to http://www.onelist.com/info/onereachsplash3.html
>
> ------------------------------------------------------------------------
>

Re: --desoldering ic's?

1999-07-30 by hodad1@xxxxxxxxxx.xxx

It hasn't happened to me yet, but it probably will eventually--if I solder
an ic in backwards
or blow one up, is there a recommended technique for getting those little
suckers out?
--Short of a desoldering station, that is.

tomr

RE: --desoldering ic's?

1999-07-30 by John Speth

I'll second that solder wick recommendation but be warned ---> NOT ALL 
SOLDER WICKS ARE CREATED EQUAL !

I have a roll of wick that doesn't work at all, period, and then I have 
some stuff that works better than any solder sucker I've used.  This wick 
has some sort of solvent in it that heats up and is consumed to make the 
job go quicker.  I know this because you can smell it as it heats and once 
its gone on the length that's heated, it ceases to work and you gotta trim 
it off.

I used some last night (not in front of me now) but I remember it said 
something like "no-clean solder wick" or something like that.

IMHO, I would desolder only one pin at a time giving plenty of time for the 
component and board to cool down between pins.  If you try to heat many 
pins at once, you'll need much more heat than for one pin risking damaging 
the board and/or the part.  That's *my* theory anyway.

John Speth
Object Engineering, Inc
mailto:johns@...

On Friday, July 30, 1999 1:27 PM, David Bivins [SMTP:david@...] 
wrote:
> From: "David Bivins" <david@...>
>
> I have a hard time with my solder sucker and prefer to use braided solder
> wick for ICs. If you lay the wick across several pins at once and quickly
> place the iron tip flat against the board, you can take up a great deal 
of
> solder in very little time (which is key to not frying the IC!).

Re: --desoldering ic's?

1999-07-30 by Steve

The KEY to using solder wicking is FLUX.  The flux will conduct the heat quickly
to melt the solder.  Melt the solder with the iron applied to the wicking.  If
there is too much solder, using the solder sucker to get the bulk of it and use
the wicking to get the rest.  The component should come out freely if you have
desoldered properly.  The "heat and yank" method is not desirable.  You will
most likely damage whatever you are removing and possibly the board.  Another
thing to watch out for is overheating the board.  If you do, you can lift a
pad/trace.  This is not hard to repair with the right tools, but it's much
easier to just avoid the problem by using lots of flux and keep the time the
iron is on the board to a minimum.  The MOTM boards take a VERY long time to
damage.  You have to do it on purpose - they are quality (unlike the so-called
Mil-Spec boards I work on)

If you have any more detailed questions, let me know.  

Steve


David Bivins wrote:

Show quoted textHide quoted text

> 
> From: "David Bivins" <david@...>
> 
> I have a hard time with my solder sucker and prefer to use braided solder
> wick for ICs. If you lay the wick across several pins at once and quickly
> place the iron tip flat against the board, you can take up a great deal of
> solder in very little time (which is key to not frying the IC!).
> 
> Then again, I'm an amateur, but this has worked well for me on other
> projects and I haven't messed up an IC yet.
> 
> David.
> 
> > -----Original Message-----
> > From: Dave Bradley [mailto:daveb@...]
> > Sent: Friday, July 30, 1999 4:18 PM
> > To: motm@onelist.com
> > Subject: RE: [motm] --desoldering ic's?
> >
> >
> > From: "Dave Bradley" <daveb@...>
> >
> > At a minimum, you've got to have a manual solder sucker. It's a hand held
> > plunger-loaded doodad that creates a vacuum when you release the plunger,
> > sucking up solder that you have just reheated with your soldering gun. It
> > works OK for ICs without a large number of pins.
> >
> > If its a cheapie opamp, sometimes I just clip the pins on the top edge and
> > remove them individually. It's harder to fix a board that you have lifted
> > pads or traces on, than it is to replace an inexpensive IC.
> >
> > Dave Bradley
> > Principal Software Engineer
> > Engineering Animation, Inc.
> > daveb@...
> >
> > > -----Original Message-----
> > > From: hodad1@... [mailto:hodad1@...]
> > > Sent: Friday, July 30, 1999 3:34 PM
> > > To: motm@onelist.com
> > > Subject: Re: [motm] --desoldering ic's?
> > >
> > >
> > > From: hodad1@...
> > >
> > >
> > > It hasn't happened to me yet, but it probably will
> > eventually--if I solder
> > > an ic in backwards
> > > or blow one up, is there a recommended technique for getting
> > those little
> > > suckers out?
> > > --Short of a desoldering station, that is.
> > >
> > > tomr
> > >
> > >
> > > --------------------------- ONElist Sponsor ----------------------------
> > >
> > > Transfer your big list to ONElist and earn $500!
> > > For program details, go to
> > > http://www.onelist.com/info/biglistbon_intro.html
> > >
> > > ------------------------------------------------------------------------
> > >
> >
> >
> > --------------------------- ONElist Sponsor ----------------------------
> >
> > Congratulations to MICHELLE UNSER
> > This week\ufffds FRIENDS&FAMILY WINNER!
> > To enter go to http://www.onelist.com/info/onereachsplash3.html
> >
> > ------------------------------------------------------------------------
> >
> 
> --------------------------- ONElist Sponsor ----------------------------
> 
> ONElist:  your connection to people who share your interests.
> 
> ------------------------------------------------------------------------

Re: --desoldering ic's?

1999-07-31 by JWBarlow@xxx.xxx

I went the cheapo route many years ago, and bought a sucker bulb from Radio 
Shack. It is almost completely useless. I'd suggest getting a RS desoldering 
tool (around $8.00, I think). I've used mine for a long time with fairly good 
results (i.e., not frying a lot of parts during removal). With a double sided 
PCB, though, it is twice the "fun" of getting parts out. I've never used 
solder wick, but I'm definitely picking some up after all these reviews!

Hey! Isn't Paul supposed to be on vacation?
John B.

Re: --desoldering ic's?

1999-07-31 by J. Larry Hendry

> From: JWBarlow@...
> I'd suggest getting a RS desoldering 
> tool (around $8.00, I think). I've used
> mine for a long time with fairly good 
> results

I have one of these and find it very good for the occasional desoldering
job.  The iron with the bulb built onto the top is the one I am talking
about.  Mine works fine.  And yes, I did solder one of my chips in
backwards once.  I found it on my "double check" prior to power up and
fixed it.  The RS desoldering iron damaged neither the chip or the iron.

I agree with the person that said to desolder a pin or two and wait for
cool down.  I use the procatice when soldering chips too.  Perhaps I am too
conservative.  But, I have never burnt one up with heat either.

> Hey! Isn't Paul supposed to be on vacation?

I think so.  And, I am too -- a 9 day motorcycle trip through Michigan. 
See you guys in 9 days.
Larry H.

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> John B.
> 
> --------------------------- ONElist Sponsor ----------------------------
> 
> ONElist announces "FRIENDS & FAMILY!"
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