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Remove the batteries.
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Remove the plastic cover on the bottom. (On older models, this cover is not centered.)
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Remove the small screw.
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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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Pull out the ribbon cable.
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Put the batteries back in (without screwing the cover on).
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Push in the batteries to release the circuit board assembly.
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Carefully pull out the circuit board assembly. Pay attention to the ribbon cable.
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Soak the keyboard in alcohol (methylated spirits). It should be completely covered. Use an airtight container.
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Keep moving the container to get the liquid everywhere.
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Wait 24 hours
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Take the keyboard out of the liquid and shake it out well.
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CAUTION!! This step is not absolutely necessary!! Opening the keyboard further is only necessary if you want to gain access to the circuit paths.
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The plastic cover on the back can now be easily detached. To do this, use a flat blunt tool to go into the gap and pry off the plastic cover. The alcohol has softened the glue.
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Let the keyboard dry well. To speed up the process, you can put it into the sun.
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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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