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push button contacts fail Answered

hi,
i disassembled my full-automated coffeemachine as the push buttons for programs failed. The buttons are a line of rubber and the contacts on the platine are toothed while each rubber contact got tiny plates that bridge the contacts on the platine. I guess that the contact plates lack of conductivity - any suggestions what i can do to improve the conductivity? I thought bout buying contact foil and glue it over the rubber contacts, but i don't know, if this is the best solution.

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caitlinsdad

4 years ago

Use a pencil eraser to clean the contact surfaces. There may be a light film of oxidation or grime from the rubber buttons. You can use a voltmeter to conduct the basic conductivity tests while the machine is unplugged from the mains. Good luck.

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Kiteman

4 years ago

Test that the plates are the problem first.

If possible, and being very careful, power-up your machine with the platine (circuit board?) exposed, and use a screwdriver with a rubber handle to touch across the contacts. Does it start working? Then you are right. Doe it not? then the problem is something else.