Victor 9000 keyboard conversion

@OldIsNew thanks for the tip on the space blanket. I got one today along with some leather punches. I did a trial run with a single pad and it went well but this seems like it's going to be exceptionally tedious :lol:

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Now before I do the other 98 pads that I need, I'll first check and make sure this foil works with the pcb. It'd be a shame to do all these without checking that first ;)

Edit: it works beautifully!
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Unread post24 Nov 2018, 22:49

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Just finished up the last of them

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Here's the basic process I worked out along the way:
  1. Remove the backing from the pad to expose the adhesive
  2. Stick the pad to the backside of the foil (in this case, the silver side)
  3. Put the leather punch over the pad and give it a good whack
  4. Press down on the punch and twist ~45 degrees
  5. Eject the finished pad and put it with the rest

Here's a video to show what I'm talking about:


This process worked pretty well for me. I was trying to be mindful of my downstairs neighbors and not make too much noise. If you hit the punch just right, it doesn't make too much noise. Once you get a rhythm going, it goes faster than you'd think.

All in all, I don't think I would recommend buying these pads from ebay. They're good quality and all, but having to do the foil myself seems like it would be a similar amount of work to punch out the foam myself too. It would also save a bit of cash I'm guessing.
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Unread post25 Nov 2018, 01:03

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Welp, I started putting it back together then realized that some of the switches need to be flipped. There are about a dozen or more screws that attach the PCB to the switches so that the pads make good contact. There are holes in the PCB that have to line up with the holes in the corner of the switches. Just more tedious work :x

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Then the moment of truth, testing the converter. It mostly works but I'm getting a lot of ghosting. Sometimes even single key presses will trigger random ghosting of other keys. I'm glad it at least kind of works but I'm afraid I've got some debugging ahead of me. Here's a clip of the converter in action.



The keyboard feels great to type on, though. I'm going to change the keymap to the one requested by the gentleman on reddit that I'm doing this work for. Hopefully I'll get it working smooth, test drive it for a few days, then send it back to him.
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Unread post25 Nov 2018, 03:25

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It seems that when this ghosting happens, the keyboard is actually sending these extra keypresses. Here I held the '4' key and got a bunch of random other keys

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So there's either some sort of grounding (?) issue or there's a problem with the material I used for foil on the pads (space blanket).
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Unread post25 Nov 2018, 06:05

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OldIsNew wrote:Do have to check each foil disk with the multimeter before gluing them on to the foam disk - non-conductive side to the PCB.

Derp, I did it with the conductive side touching the PCB.

I was going to post this video where I test first with my finger and then with a finished pad but I reread your comment and figured it out while the video was uploading.



I guess i have a bunch of rework planned for tomorrow :(
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Unread post25 Nov 2018, 07:16

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I can tell you one thing; that's a mistake I'll only ever make once. Such tedious work pealing all those bad pads off and replacing them. Not to mention punching out the foil pieces again. I was ready to pull my hair out.

But everything's back together (minus the case) and the converter seems to work perfectly! Fingers crossed. I'll test it out for a day or two to make sure everything registers with normal typing. Still need to change the keymap but I'm really pleased with how this has turned out thus far.

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Unread post09 Dec 2018, 03:25

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When I get my hands on it again how will I go about remapping it if I so desire?
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