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An intermittant BREAK key is causing trouble on this Master128.
So we need to fix it, probably just needs a clean. So first remove keys
close to the faulty key for ease of access.
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On the PCB side, identify the soldered joints relevant to the key
being repaired and de-solder them.
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Moving back to the top-side, push a small screwdriver under the
keyswitch to give some upward pressure, then with another screwdriver push
the securing clips in and the key will pop up.
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Lift the keyswitch clear of the board.
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To dis-assemble, using some pliers grip each pin on the base in
turn and "unscrew" them. Next part the 2 halves of the switch with a thin
blade. Note some switches are glued together, they will part though.
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Once parted, make sure not to loose the spring or any other parts.
Note how it came apart. Dont "rush" into any job.
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With the switch totally stripped, clean all parts with an alcohol
based cleaning pen then re-assemble.
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Before re-fitting to the Keyboard chassis it is best to test the
switch using a multi-meter. It will save time if the fault was not remedied.
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Push the switch back into the chassis and then on the PCB side
re-solder the joints.
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Finally re-fit the keys and hopefully you will have a fully functional
keyboard again.
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