On Wed, 2004-02-04 at 12:12, Colin Anderson wrote: > I have used hot glue for many years with no problems. Decent adhesion, but > can be picked off if ness. I showed this to a systems integrator that had > problems with shipping PC's upside down and boards would become unseated. He > used this on thousands of systems and the problem was eliminated.
Hmm, sounds like something the Digium resellers could do. I can see the commercial now.... <cheesy announcer voice> Is your access to <insert local emergency number> important to you. Do you want to not have to go looking for your tools in the middle of an emergency. For the low low cost of $29.99, we will throw in a hot glue gun and 3 sticks of glue to solve all those earthquake related failures. </cheesy announcer voice> > -----Original Message----- > From: Stephen R. Besch [mailto:[EMAIL PROTECTED] > Sent: Wednesday, February 04, 2004 10:14 AM > To: [EMAIL PROTECTED] > Subject: [Asterisk-Users] Re: Boards falling out... > > > Greg Kedrovsky wrote: > > > I have a TDM40B, 4-port fxs card. Each port seems to have it's own > > little board on the fxs card. Each little board is not sodered in, but > > rather "hangs" (I have a vertical case for the server) on what I would > > call jumper pins (sorry, I'm not a profession geek, just a wannabe). One > > of my little boards, over time, slides off those jumper pins. I just > > noticed it this morning. I had to power down, seat it, and power up > > again. That's a pain. > > > > We did, though, have an earthquake this morning. That may have shaken > > things loose a bit. But, it wasn't much to speak of (long, but not > > strong). > > > > Has anyone else experienced this problem? What could I do to solve it > > (seat the little card a little more permanently)? > > > > Thanks ahead of time. > > > > -Greg > > > There are three issues here, relating to the other posts on this topic. > Don't use loktite. Loktite is what is called an anerobic adhesive. > Specifically, it is catalyzed by contact with metal in the absence of > oxygen. As such, it will only cure (in the absence of some other > chemical activator) only down inside the pin sockets, holding them > together. The rest will stay uncured and spread all over other stuff. > This may essentially make them a single use contact. > > The silicone is a good bet. The acid referred to is the acetic acid > (i.e., vinegar) released when the monomers in the RTV goo cross react to > form the silicone. Once the cure is complete, there is no acid > production and what was produced diffuses away. Mild acids are not > terribly corrosive to most metals, and not at all corrosive to gold. > The types of RTV that don't produce acid may actually produce alkali > (ammonia), which is far more corrosive, but also diffuses away readily. > Nevertheless, I would stick to the stuff that smells like vinegar. > > Finally, I have found that the best approach is the simplest, when it > works. If you can get one of those nylon tie-wraps around the daughter > card in such a way as to hold it in place, this is the best - and most > reversible approach. Sometimes, there are appropriate holes in the > motherboard, othertimes the ty-wrap can be snaked around under the > connector - however, don't run it under any other type of component. I > have even drilled holes in 2-layer circuit boards, but I would not > advise this unless you really, really, really know what you are doing. > > Finally, if the female side of pin sockets are loose enough to let the > dayghter cards fall out, they may also be the source of noisy, > intermittent connections. Sockets of allmost all kinds are notorious > for this kind of thing. I can't tell you how many times I have repaired > a flakey circuit board by removing the sockets and soldering in all the > (formerly) socketed chips. The square pin spring contacts in those > connectors are only designed for a few insertion/removal cycles. If > that is the case, you should get a good repair tech. to replace them. > > Good luck and hang in there. > > Stephen R. Besch > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- Steven Critchfield <[EMAIL PROTECTED]> _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
