Here's that keypad, detached.pic.twitter.com/ua3z0Pf32Q
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The other PCB is the display one. It has seven individual 7-segment display modules, and one that just does +/-.pic.twitter.com/Zbn3xjBxSF
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it turns out the switches are magnetic reed switches! The plunger has a magnet on it, which makes or breaks a connection inside the reed switch.pic.twitter.com/LnITc23nsI
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I desoldered all the keyswitches from the PCB, so that I could clean them separatelypic.twitter.com/hsYkYak3wV
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@mcpherrinm figured out what this came from: a Mori Seiko SL-1 lathe (from 1978) https://twitter.com/mcpherrinm/status/1281501442021289984 …pic.twitter.com/LCq3WZdApr
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also I doublechecked the keyswitches, they say "SMK" on them. That's Showa Musen Kogyo Kabushiki Gaisha, a japanese electronics company that's been around since the 20s. https://deskthority.net/wiki/SMK
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It's not an exact match, but I found the manual for a similar control panel, so I can hopefully slightly understand how this is supposed to work: https://www.yaskawa.com/downloads/search-index/details?showType=details&docnum=DE6425439 …pic.twitter.com/X3uosY3gcN
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Cleaning isn't a 100% success. In some cases, like the "T" on the big emergency stop button, the grime is stuck on there about as hard as the paint, so if you try to get it clean it ends up taking off the paint.pic.twitter.com/91fTTP61Q4
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