[sdiy] Repair part question, Korg DDM-110/220 buttons

[Nathan Trites]

Hi Benjamin,

Can't see how tall they are in the pic but looks like it could be an old
generic of an ALPS or NEC switch. I found what might be the same thing on
Ali Express but no part number:
https://www.aliexpress.com/item/32856725048.htm

If no one here can correctly ID them, it might be worth checking into the
mechanical keyboard scene - the low profile ALPs, NEC, and KPT switches all
look very similar to this, and there are some in the big photo on the
following blog post that look like they could be a match. Of course it's a
guy named ThereminGoat :)
https://www.theremingoat.com/blog/1001-switch-nights-tales-from-the-collection

Nathan

On Sat, Jul 13, 2024 at 9:37 AM Benjamin Tremblay via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Hi, I got me a Korg Super Drums off eBay.
> It looks just like the one I had in 1985 before I went crazy with the
> soldering iron and circuit bent the clock.
> It was DOA. I was about to give up on it when I noticed hairline cracks
> around one screw hole in the board. Was able to fix them and then it booted
> up properly.
> But it still seemed dead. Until I almost accidentally closed one of the
> switch contacts with a tool, and it responded. (In fact it’s so snappy I
> could be lazy and trigger the switches with MIDI via 4066 ics and it would
> probably respond at a high speed.)
>
> Looks like very fine hair and dust, like Persian cat dander, is coated
> around the knobs and switches.
> So anyway I found this link on polynomial showing how to crack the
> switches apart and clean them with a q-tip. I have some black goo I used to
> permanently fix an Alesis MMT-8 and so I intend to coat the rubber contacts
> with this good stuff.
>
> But just wondering: Does anyone know what kind of switch this is? (See
> photo on polynomial Repair Blog). To me it looks too good to not be an
> Alps, but it’s not a keyboard switch, is it?
> Whatever it is it’s kinda cool, as long as you don’t have cats.
>
> It seems like a lot of these kinds of parts have vanished from the storage
> bins and there’s nothing that would take its place.
>
> Ben
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