So, yesterday I have received a semi-working mechanical keyboard: Zalman ZM-K500.
The keyboard is in relatively good condition, except some scratches and rust on the red plate, and half-a-dozen of non-working keys.
My first thought was to switch places critical H, D, Esc and 7 with some unused keys, like Ins, Scroll Lock, Print Screen or media keys.
Good thing I was not in a hurry and decided to test, whether I can fix the keys themselves.
Here's some pics of the process:
1) I removed the caps and completely disassembled the keyboard
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2) I moved some clamp holders from smaller to larger keys (L_shift works fine without a clamp)
3) I de-soldered the broken Kailh red switches
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4) Completely disassembled each key, cleaned the contact surface and adjusted the flexible plate for better (more responsive) contact
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5) Tested each key with my fancy multimeter tweezers, before soldering them back.
End result - is a fully workng $15 mechanical keyboard. I am currently using it to type this post.
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I've never used a mechanical KB before, so it takes some time to get used to it, but so far the feeling is very pleasant. The only thing that bothers me now, is a sticky "I", so I guess I will leave you, guys, to reading my jumble, and go to my "workshop" for a few minutes to warm up soldering station and fix this thing one last time.
P.S. Since this KB was so cheap, I've decided to spend an additional $30 on a box-full of Gateron switches (120ct). Maybe my next project will be a full redo and hardware mod of this keyboard.
I'll try to post some updates next week.