Re: C65 keyboard repair

Interesting find.

Can you check the revision of board and keyboard?

Afaik all c65 keyboards (including the prototypes/samples) were made by Mitsumi.

There should be paper sticker with the part number on the back. For the German keyboard this is 50910712.

Might be that they changed the keyboard during development.

If needed I can disassemble mine.

Regards,

Simon


> Am 08.10.2016 um 19:35 schrieb Michał Pleban <lists@michau.name>:
> 
> Hello!
> 
> The keyboard in my C65 stopped working - a few columns of keys do not
> work anymore. I tried looking at the cable and the connector to find a
> broken trace, but I don't see any obvious problems. I thought that the
> connector on the flat ribbon cable might get flaky, so I cut it to make
> new contacts. It helped a bit - most columns got back to work but the
> last one (which contains the rather important Return key) does not. I
> don't have more cable to cut so I would like to try other solutions.
> 
> Awhile back, there were C65 keyboards available on Ebay and I bought one
> of them, so I plugged it into my computer thinking it will solve my
> problem, but nope... it turns out that this keyboard has incompatible
> pinout! Fortunately the difference is only in the GND pin for the LEDs
> so I have all keys working now, but the LEDS don't work.
> 
> I thought to rework the keyboard to change the pinout, but it turns out
> that it's not made on a PCB like the C64 or 610/710 keyboards I worked
> with before. Instead, the whole keyboard is made as a big sheet of flat
> "cable" in plastic envelope, and looks like this:
> 
> http://i64.tinypic.com/k3njti.jpg
> 
> The black conducting contacts are not metallic, so they cannot be
> soldered. Everything else is covered by plastic.
> 
> Does anyone have any idea how a thing like this could be resoldered? My
> idea was to peel the plastic gently to reveal the metal trace below but
> I am not sure how easy it could be, and I have no idea if the metal
> below can be soldered. Also I would not like to try this on a C65
> keyboard and would love to have something similar to try before, but
> where can I find another keyboard like this?
> 
> Regards,
> Michau.
> 
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