De Solder SM electrolytic caps
in [Repair]
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From: JW on 2 Apr 2010 05:40 On Thu, 01 Apr 2010 17:10:48 -0500 RubbishRat <bishrat(a)hotmail.com> wrote in Message id: <Xns9D4DEBCBB186Cbishrathotmailcom(a)216.196.109.145>: >Hi, >Does anyone have any good tips for desoldreing these SM caps without >damaging the pads? >I tried wicking each pad dry but the darned thing still took one of the >flimsy little pads off with it. Also would it be OK to replace a SM cap >with a similar value radial if I support the radial with a blob of silicon >sealer or something after soldering ? >Any help welcomed. > I routinely re-cap Tektronix acquisition boards from TDS series scopes. I've found the best way is to cut them close to the board - right where the can dimples in a bit. Then I just flick the remaining part of the can and plastic off with an x-acto knife, and remove each leg with a soldering iron. There's about 70 in each scope, and I've probably done 50 scopes in all. Never damaged a single pad.
From: Tim Schwartz on 3 Apr 2010 07:00 On 4/1/2010 6:10 PM, RubbishRat wrote: > Hi, > Does anyone have any good tips for desoldreing these SM caps without > damaging the pads? > I tried wicking each pad dry but the darned thing still took one of the > flimsy little pads off with it. Also would it be OK to replace a SM cap > with a similar value radial if I support the radial with a blob of silicon > sealer or something after soldering ? > Any help welcomed. > > Well, Here is an odd possibility. One brand of stereo I service has a mod that require removing 16 SM caps from a PC board. (That's the entire mod). In speaking with a friend who also services these, he suggested grabbing the cap with a pair of needle nose pliers and rotating the cap until the leads snap. This usually requires about 90 degrees of rotation. Then it's easy to clean up the pads. The caps are 10uf/16V and have a black plastic base. I'D SUGGEST TRYING THIS NO A SCRAP BOARD FIRST, as some boards may not have the foil attached as well as these. Regards, Tim Schwartz Bristol Electronics
From: Jim Yanik on 3 Apr 2010 08:48
Tim Schwartz <tim(a)bristolnj.com> wrote in news:4BB71FDB.8010408(a)bristolnj.com: > On 4/1/2010 6:10 PM, RubbishRat wrote: >> Hi, >> Does anyone have any good tips for desoldreing these SM caps without >> damaging the pads? >> I tried wicking each pad dry but the darned thing still took one of >> the flimsy little pads off with it. Also would it be OK to replace a >> SM cap with a similar value radial if I support the radial with a >> blob of silicon sealer or something after soldering ? >> Any help welcomed. >> >> > Well, > > Here is an odd possibility. One brand of stereo I service has a > mod > that require removing 16 SM caps from a PC board. (That's the entire > mod). In speaking with a friend who also services these, he suggested > grabbing the cap with a pair of needle nose pliers and rotating the > cap until the leads snap. This usually requires about 90 degrees of > rotation. Then it's easy to clean up the pads. The caps are 10uf/16V > and have a black plastic base. > > I'D SUGGEST TRYING THIS NO A SCRAP BOARD FIRST, as some boards > may not > have the foil attached as well as these. > > Regards, > Tim Schwartz > Bristol Electronics > > SM caps don't have "leads". SM = surface mount. Just get or make the right tool for the job. -- Jim Yanik jyanik at localnet dot com |