cleaning keyboard of Fujitsu-Siemens Lifebook C-4135

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I have an old Fujitsu-Siemens Lifebook C-4135, which still behaves
reasonably well, except for one thing: some of the keys have become
rather "insensitive" - you have to hit them hard.

This machine is old, so I probably will not spend any money on a
professional keyboard repair. However, I wonder whether I could
clean/repair it myself.

I suppose that there are many different technolgies and designs for
laptop keyboards.
Where can I find information about opening/cleaning/repairing the
keyboard of a Fujitsu-Siemens Lifebook C-series?

Re: cleaning keyboard of Fujitsu-Siemens Lifebook C-4135

Generally you can't do much.  Most laptop keyboards have two mylar
layers with the contacts printed on them in conductive ink, held apart
by a 3rd layer of mylar between them that has a hole in it (about a
quarter-inch) at each key contact point.  When you press a key, the two
outer layers are forced together at that point and the conductive ink
touches making the contact.  In the first place, you usually can't get
these assemblies apart, they are usually between layers of hard plastic
that are heat-welded together (although I have seen one or two older
ones that used screws).  In the second place, it's hard to clean the
conductive printing, and you can even rub it off.  So, usually, when a
laptop keyboard goes bad complete replacement is the only option. wrote:

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