Restoring Fujitsu FKB4700 switches?


27 Feb 2019, 19:57

I have a Fujitsu FKB4700 that has seen 20-odd years of pretty heavy use. The C and V keys have become very hard to register. Before I crack open the case, any advice on what I should expect to find there and how to fix it? I know it's a membrane, but I'm asking about special concerns with this model.



28 Feb 2019, 19:24

Well, that was easier than expected. All I had to do was clean 25 years of accumulated lint from the top of the membrane. I'm really impressed with the durability of the FKB4700. The insides looked practically new. Also really impressed with how easy it was to dis/assemble.

Just be sure to rest the inverted keyboard on the frame rather than the keys, so the keys are elevated from the table. Otherwise, the keys will push the pistons up to a position where they easily fall out. Also, be really cautious about pulling that membrane away the first time, as the pistons stick to it.

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