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Remove the batteries.
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Use a flat blunt tool to loosen the ribbon cable clamp. To do this, pull the front part away from the rear part.
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Put the batteries back in (without screwing the cover on).
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Soak the keyboard in alcohol (methylated spirits). It should be completely covered. Use an airtight container.
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Take the keyboard out of the liquid and shake it out well.
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Put the parts back together in reverse order. When installing the circuit board unit, make sure that you pull the ribbon cable to the side.
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