Epson QX-10 Keyboard NKRO USB conversion (Fujitsu 2nd Gen Leafsprings)

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Sangdrax

30 Mar 2019, 11:59

Special thanks to snacks for his previous work on this stuff. It sure helped me get up off my ass and get this done.

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Here's his matrix trace with a few additions. One is to have all the numbers on the column and row connects for each switch so you don't have to hammer it out from the firmware. There was a minor miss on the Row 11 stuff so look close to where the 11/12 break is there. The numbers show it but it's different from the original colors.

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I tried to use as much of the existing traces as I could. Almost half the rows have only one switch connected so I was even able to put single diodes in the old diode slots. Two things just would not desolder though and trying to force it just wound up with a couple scorched spots. Boy, that's embarrassing. Any proper electronics guy would tear me a new one for that popcorning around the old jack connect.

Otherwise, everything else turned out well. Only screwup was me not paying attention and accidentally wiring the keypad enter to the column instead of the row. Two minute fix but you can see it in the pic.

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View from the top.

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Wiring up the LED's in double for the pin current limits actually worked out just fine. You can't hardly see the brightness difference.

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And all nice and clean. I love the switches on this thing, definitely in my top 3 linear switches.

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Finally, QMK firmware for it. Works fine if you use the column and row numbers from the first pic. Layout file included for your own binding. https://www.mediafire.com/file/845k3yi2 ... e.zip/file
Last edited by Sangdrax on 03 Apr 2019, 00:22, edited 1 time in total.

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OldIsNew

02 Apr 2019, 02:53

Nice!

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snacksthecat
✶✶✶✶

14 May 2019, 00:32

Woah I missed this! Nice write up!

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Sangdrax

14 May 2019, 03:25

Thanks guys. Been using her as a daily driver and she's going strong. I did tweak the key assignments a bit though. Even did some silly stuff like alt code macros so the ½ ¼ key outputs that for real now in the first layer.

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