Enterprise Forever

:UK => Hardware => Input devices => Topic started by: Tech on 2020.January.19. 22:48:34

Title: KB Membrane Fix?
Post by: Tech on 2020.January.19. 22:48:34

Some keys in my E64's keyboard stop registering inputs. It seems that the membrane is defective. I found replacements online, but the prices are quite high! I wonder if there's a way to fix the one I have without the need for a new replacement? Any ideas please?

Thank you.

Title: Re: KB Membrane Fix?
Post by: SlashNet on 2020.January.19. 23:03:32

Hi!
Usually, old membranes have cracks near the end of ribbons.
You can try to carefully cut off damaged area.

(https://sites.google.com/site/enterprise128k/home/hardware/HW_KBcracks_1.jpg)

Title: Re: KB Membrane Fix?
Post by: Zozosoft on 2020.January.19. 23:12:50

It is usually broken at the motherboard connection. Cut the broken part (few mm), and it will start working again :-)
Repeat it when broken again... problem will come when the connecting tail becomes too short to be plugged in...
In this case build an expansion cable.
Membrane connectors:
Original types: MOLEX 5229-08CPB, 5229-10CPB
Chinese alternatives: CONNFLY DS1020-08ST1D, DS1020-10ST1D
At the motherboard connection I use Preci-Dip pin headers.

Title: Re: KB Membrane Fix?
Post by: Tech on 2020.January.20. 00:04:48

Thank you guys. I'll check the connections and remove the damaged part if needed 👍

Title: Re: KB Membrane Fix?
Post by: Judge on 2020.January.31. 17:35:36

high quality new keypad membrane made in Hungary 7200HUF = cc.  23EUR

[attach=1]