ELEKTRONIKA MK 61 display and keys dont work (Pictures)

[TASP]

Not relevant to this repair job, but some years ago I used an aerosol degreaser product (sorry, don't recall the name) on a membrane keyboard in a restaurant kitchen on their waitress call light keyboard.

The keyboard was indeed, NASTY.

However, the instant the product touched it, not only did it dissolve 10 years worth of accumulated crud, it also liquified the keyboard.

Totally.

I've tried to be much more careful about such things since. I offer this experience in the hopes of saving more innocent keyboards in future.