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Thread: Conductive Material for Keyboard Membrane Repair

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    Retro Girl Staff Moderator SkydivinGirl's Avatar
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    Default Conductive Material for Keyboard Membrane Repair

    Hey everyone,

    I'm trying to find a conductive material to repair an SX-64 keyboard membrane. For those of you who have not seen an SX-64 keyboard membrane, it's basically a large rubber membrane that connects to the control board via a row of contacts on both the rubber membrane and the board itself.

    The problem I'm having is that the row of connectors is not getting a good connection. If I put pressure on that row then the keyboard works perfectly. I've already tried cleaning all the contacts but the problem persists. If there is some sort of material that I could use to re-coat the contacts on the membrane then I think the problem would be solved. Is there anything like that available?

    Thanks guys!

    Heather
    Promoted to Level II Solder Tech and Hackery Padawan

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    Amibayer! Bryce's Avatar
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    You could try using conductive silver paint. This is great for repairing keyboard foils and would probably be fine for fixing the contacts too.

    Bryce.

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    Keeper of the Valiant Turtles. Amibayer! thecellartroll's Avatar
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    I haven't tried this but I think it would work...
    http://www.ebay.co.uk/itm/Electrical...item4d04064755
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    @Heather

    The conductive silver paint is good for repairing PCBs but will likely wear down to quickly for a keyboard application. So the conductive rubber is a better (or longer lasting choice). Digi-Key sells this but you can usually find better price on other-bay.

    Kevin

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    Amibayer! Bryce's Avatar
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    I understood that tha problem is with the connector tags (ie: the edge connector on the foil) and not the actual buttons themselves. If it's the buttons, then yes, conductive rubber is definitely a better choice, but for the connector tags, which will only be re-connected once, silver paint should be fine.

    Bryce.

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    i have used car heat screen heater element repair stuff before with great success (silver conductive paint)
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    Bryce is correct, I'm looking to repair the conductors for attaching the membrane to the board so it won't be moving. I may opt for the conductive rubber. Any chance someone could send me a link to it on Digi-Key? I searched but couldn't find it.

    If I can't find something suitable then I might try the conductive paint.

    Thanks guys!

    Heather
    Promoted to Level II Solder Tech and Hackery Padawan

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    Graphite from pencil would do the trick. I fixed a broken trace of a Spectrum membrane ribbon with a pencil.
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    Might have to try that for a quick fix.

    Thanks!

    Heather
    Promoted to Level II Solder Tech and Hackery Padawan

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    @Heather

    Thanks for clarifying that. In that case, the conductive silver is a better choice for an edge connector because it has lower electrical resistance than conductive rubber. Digi-Key no longer stocked the conductive silver the last time I checked but a search on other-bay should turn something up at a reasonably good price.

    Kevin

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