Advice on Desoldering an IC

[Martin Bishop]

If the Klein cutters are too bulky, you may care to investigate.

Lindstrom 7191 https://uk.rs-online.com/web/p/cutters/3320341 are the usu first resort small cutters - they should be fine enough for 0.1" pitch ICs.

A finer pair are Bondline 1570 https://www.bondline.co.uk/product/hand-tools-and-tweezers/esd-cutters/c1570 definitely fine enough for 0.1" IC legs (just put them to an IC), and probably 50 mil packages.

And for a compact pair of 45 deg pin croppers Bondline C1582 https://www.bondline.co.uk/product/hand-tools-and-tweezers/esd-cutters/c1582

HtH; BR  Martin



-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Rob Jarratt via cctalk
Sent: 15 April 2022 22:33
To: 'Chris Zach' <cz at alembic.crystel.com>; 'General Discussion: On-Topic and Off-Topic Posts' <cctalk at classiccmp.org>
Subject: RE: Advice on Desoldering an IC

I do have some diagonal cutters, but although small they seem to be still too bulky to reach the pins. I will have to try to find some finer ones. These seem to look OK: https://uk.farnell.com/klein-tools/d275-5/wire-cutter-diagonal-127mm/dp/2839543

 

Also, I have seen the recommendations regarding a Hakko 808. It looks like the modern successor is the FR301 https://www.hakko.co.uk/product/fr-301-portable-desoldering-gun/. I think what may be better about this is the wider choice of nozzles.

 

Regards

 

Rob

 

From: Chris Zach <cz at alembic.crystel.com>
Sent: 15 April 2022 18:51
To: rob at jarratt.me.uk; Rob Jarratt <robert.jarratt at ntlworld.com>; General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>; Rob Jarratt via cctalk <cctalk at classiccmp.org>
Subject: Re: Advice on Desoldering an IC

 

Cut the pins with a very sharp set of dykes then remove them one at a time. Then use flux and detailer braid to remove the solder

On April 15, 2022 1:49:33 PM EDT, Rob Jarratt via cctalk <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org> > wrote:

I am trying to remove an IC from my PDP 11/24 CPU, a DS8641. I am really struggling to desolder it. I am using the technique of applying fresh solder and then removing it. But after multiple cycles of this I think I am starting to damage the PCB.

 

I am using a fairly cheap desoldering station (this one https://cpc.farnell.com/duratool/d00672/desoldering-station-uk-eu-plug/dp/SD
01384?st=duratool%20desoldering). Its spec in terms of vacuum pressure is equivalent to that of the professional Hakko ones though. I am also trying a hand desoldering pump. None of these are able to clear many of the holes of solder, although some are doing better than others. Nevertheless, the IC remains stubbornly unmoving.

 

Are there any tips for removing ICs?

 

Thanks

 

Rob

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