On 1/6/2015 6:50 AM, Dave Caroline wrote: > There are a number of parts to your button problem, you did not say > which type yours are. > > some the rubber is just a thing to transmit motion to the inner > contacts (membrane or dimple) > in others there is a conductive rubber pad to short two traces. > > In both cases wear and corrosion on the PCB can be fatal, cleaning can > make a temporary repair > The metalic click dimple can collapse, you need to replace > The rubber shorting type can be cleaned and softened for a temporary > repair (rub the surface and wash with iso alcohol )
There are conductive paints that can be used to fix the worn off carbon coating on the contact surface. I doubt this application would use bare snap domes held to the PCB with what is essentially heavy packing tape, but I've seen that used on some pretty $$$ consumer electronics - and some really cheap stuff. That could work as a fix for carbon coated rubber contacts, if you can find a source for the snap domes. You'll need ones with 3 or 4 raised sections on the edge so they can be positioned not to short the leads up to the contacts. Tape in place using the heaviest clear packing tape you can find. If a dome cracks you can just peel the tap off and replace it. Back when computer mice were expensive, I used to repair their snap dome switches. Cut the tops off the four melted pegs holding the top on the left switch then do likewise to a good right switch on another mouse in worse condition. Drop the good dome into the switch and carefully super glue the top back on. I also shortened many mouse cords that broke wires where they exited the body. It was quite odd that most of the more expensive ones didn't use a strain relief but many cheaper ones did. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
