| Electronics > Repair |
| best method to restore conductive keypads? |
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| coppercone2:
My wavetek 399 has a rubber keypad with the carbon stuff on it. I need to press very hard with a implement to get it to register. I cleaned them before and it did not really help. I see there are a whole bunch of methods to repair them, from gluing on conductive plates, to putting conductive glue on, etc. What works the best and is most durable? |
| Psi:
Check with a DMM using a very light touch to see which side is the problem (higher resistance). Either the carbon pads inside the rubber buttons or the pcb carbon tracks. (It's probably the carbon pads on the rubber buttons) If that's correct, then you can probably order some carbon sheet or carbon pads and cut them out to stick pieces inside the buttons to restore them. |
| coppercone2:
what should a good resistance be to light probing? ANd they are over gold tracks, those are fine. I am gonna stick it in a hot ultrasonic for a while incase it got contaminated, maybe that will help. How about silver paint? Silver epoxy? |
| Psi:
The rubber buttons are usually covered in carbon and this can wear away/crack because the buttons move. You could try some silver paint/silver epoxy however i feel that it will crack under the flex of pressing the buttons. I would try to find a sheet of carbon intended for button use. Or you could probably find some junk electronic device with carbon buttons and pry out the pads using a knife and then glue them into your defective keypad buttons. |
| coppercone2:
do they have high flex paint or coating that is conductive? Like silicone? Mix silver powder in 2 component silicone? The idea of... cutting all that crap is really awful |
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