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m-audio slider(s)
patrickkeane Posted: 21 Nov 2020, 10:11 PM
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W2BRS

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In what may go down as my greatest eBay purchase ever, I bought an m-audio axiom 49 gen 1 keyboard on eBay for the low price of $4.25 plus shipping ($25).

Claimed to be "broken", I gave it a + - hard reboot, and it works fabulously. Ignoring its cosmetic condition, which is still perfectly fine, I note that the D9 slider is completely unresponsive, and the D14 slider is "slow" to respond to changes and also -- it bottoms out at 3, not 0.

These seem like pretty minor issues and ignorable -- but perhaps worth repairing. I suppose that D9 is a broken solder joint. D14 is more puzzling. Thoughts?

Last edit by patrickkeane at 21 Nov 2020, 10:11 PM

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DAVID Posted: 22 Nov 2020, 08:11 AM
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avrs + midi = best diy synths

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What an amazing deal you got for that keyboard. Could it be that the d14 slider needs cleaning on its track? maybe some electrical contact cleaner will do the job.

Last edit by DAVID at 22 Nov 2020, 08:11 AM

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patrickkeane Posted: 22 Nov 2020, 03:11 PM
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Well, after trying deoxit on all the sliders, I couldn't seem to make any headway with them, so I took the board out and after toning out the traces for a while, I came to the conclusion that slider 9 and 14 were just bad. So, I removed them both and swapped them. Whereas slider 14 used to be "slow etc" in position 14, after moving it to position 9, it works great. So, position 9 is perfect. Perhaps just resoldering it also helped? Hard to know.

The slider removed from 9, when moved to 14 moved the problem. This slider seems to be a goner.

Now I just need to be on the lookout for a new one, apparently made by ALPHA (stamped on the side). AliExpress doesn't seem to offer an immediate perfect matches for it, but I'll keep looking around.

Anyway, the situation is 50% improved!


(User posted image)


Last edit by patrickkeane at 22 Nov 2020, 03:11 PM

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mit Posted: 22 Nov 2020, 04:11 PM
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yeah whatever

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I have a love-hate relationship with my M-Audio Axiom 49. I also bought it on eBay and it came with a broken slider. I never did get round to repairing it, but it has enough sliders that I wasn't bothered.

The thing that bothers me the most about the keyboard is you can spend ten minutes configuring what CC each knob and slider sends, and then a single accidental press of the "zone/group" button will overwrite them all with different configuration. Sometimes changing patches will also reset their config. I have tried at least twice to read the manual and figure out how this is supposed to work.

But I really like how it's easy to toggle midi-interface mode. This is something the Keystep gets wrong, the only way to use its MIDI ports as a USB interface is to enable MIDI-Thru in its SysEx configuration software, which then merges the midi streams. What a nightmare!

I still plan to one day write my own firmware for the Keystep, it's an stm32f103 inside...

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patrickkeane Posted: 22 Nov 2020, 04:11 PM
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W2BRS

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Well, I disassembled the potentiometer, and its definitely got NC on pin1, so -- that's a bummer.

I think I found the match on AliExpress after some digging:

https://www.aliexpress.com/item/32797661522.html?spm=a2g0o.productlist.0.0.6a3a243apzuJs4&algo_pvid=1ab1dc95-f7a9-4bfc-b5e0-395106c12d45&algo_expid=1ab1dc95-f7a9-4bfc-b5e0-395106c12d45-13&btsid=0b0a556e16060635160658134e89a4&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

Its a 45mm Alpha with a strange layout, the pins are recessed in, so most others would be a mismatch. Anyway, 3 for 9 bucks, and if I order it now I might have it for Christmas. If this is the right part I will let you know Tim. The only thing to do will be to disassemble and swap the black plastic indicator with the metal one this seems to come with.

My only complaint at the moment is that disassembling it revealed at least 4 different screw sizes.

I think there are ways to lock out the zone button?
Patrick

Last edit by patrickkeane at 22 Nov 2020, 05:11 PM

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