Indeed! Great investment.
73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -----Original Message----- From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of Rob Jarratt via cctalk Sent: Friday, April 22, 2022 2:04 PM To: 'General Discussion: On-Topic and Off-Topic Posts' <cctalk@classiccmp.org> Subject: RE: Advice on Desoldering an IC I decided to invest in a Hakko FR-301. It worked almost immediately. Hours of trying before, I did it in 10 minutes! Regards Rob > -----Original Message----- > From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of dwight via > cctalk > Sent: 16 April 2022 14:00 > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk@classiccmp.org> > Subject: Re: Advice on Desoldering an IC > > Sometimes the IC has been installed with the pins under tension. This > is typical of machine inserted ICs. When the solder is loose, bend the > pin away from the side it is pressed against. Do this carefully, don't > over bend. You want it to center in the hole. I recommend doing this > with a separate iron than the desoldering tool, so you can see what > you are doing. Once the pin is nicely centered in the hole use the > desoldering tool to suck the solder out. > Make sure to always use a clean tip. An oxidixed tip will require > excess pressure to transfer heatand damage the trace. Keep the solder > shinny with a spung or soft metal wool. Do mot use a hard metal to > clean an iron clad tip or it will damage the iron and rot it from the > inside 🙁 > When not using the iron but leaving it hot, always leave a blob of > solder so that it won't have a thin oxide coating that is hard to > remove. KEEP A CLEAN TIP! > After sucking the solder with the tool, with a small screw driver, > give the pin a slight sideways pressure and let the screw driver slip > off the pin. It should make a plink sound or a momentary ring. This is > something that you'll just have to learn the sound of. If it doesn't > sound right it means it isn't free of the sides. Add solder and try to bend > the pin. > Often the body side of the IC will have a tiny film of solder right > where the IC sits on the trace. If this is just the tiny amount to > solder, one can break it loose with a pair of short needle nose > pliers, By squeezing the two sides of the IC together. Don't expect to break > loose a large blob. > Of course, if you expect to throw the IC away, use sharp pointed dikes > to cut the pins at the package and pull each pin individually while the > solder is hot. > Use a small vice to hold the board so you can work from both sides. > Tweezers are best but heat the solder first and when hot grab the pin from > the top. > Work quickly while the solder is hot. > You may need to refill the pin with fresh clean solder. Old oxidized > solder does not remove easily. Use separate rosin flux if you have it > ( not plumber flux!! ). > Like I said earlier, use a really clean tip. It should be shinny > before trying to heat the board. It is hard to do with the higher > temperature solders. There is some low temperature stuff you can use to > remove solder more quickly. > I like using a large manual plastic solderpulit. Some like to use solder wick. > The solder removal suckers are often hard to keep the tip clean. If > you have to press hard on the tip to the work, the tip is not clean. > It does help to have some really tiny flux core solder to touch right > at the junction of the iron and work to start the heat transfer. Never > use force to get the heat to start to transfer! Clean tip and a quick touch > with solder is all that is needed. > When you are not using the iron for some time, but leaving it on, add > a thicker blob of solder on it so it doesn't get a thin hard to clean oxide > on it. > KEEP YOUR TIP FREE OF THIN OXIDE! > Dwight > > > > ________________________________ > From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Rob Jarratt > via cctalk <cctalk@classiccmp.org> > Sent: Friday, April 15, 2022 10:49 AM > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk@classiccmp.org> > Subject: Advice on Desoldering an IC > > 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
