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This is the keyboard off of one of my A4000's
Its in a typically grubby state and in need of a good clean, so lets
get to it.
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Ive found the best way to start is to first remove the "top" row
of keys. Try to grasp one and pull upwards, they will come out with a click.
Once I have one out I gently lever others out.
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There are "no" screws holding the keyboard together.Use a screwdriver
to "gently" lever the tabs in the 3 slots underneath. Take care as the
plastic can be brittle.
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Next lift upwards from the front and the lid will un-latch itself
at the rear.
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Next pull off the remaining keys and lay them out in order to aid
re-assembly. Get the vacuum hose and a paintbrush to remove all the grime
you can. A wipe with a damp cloth will help.
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Using a small screwdriver, lever the several clips which hold the
top cover in place.
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Lifting the cover off reveals a rubber top layer to the membrane.
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Lifting this will reveal 2 more layers of membrane.
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Pull off the "reset" button and gently ease out the PCB. The membrane/PCB
assembly can be wiped clean as a whole.
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Using a craft knife, ease it under the label and slide out. The
label and case can now be cleaned with damp cloth. Remember no harsh detergents
or chemicals as they can ruin plastic.
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Re-assemble the keyboard in the reverse order. Finally wipe all
the keys with a damp cloth. Keys always shine up fantastic Ive found.
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Finally re-fit the keys by just inserting them into there relevant
hole and pushing down until you hear a click.
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