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 Post subject: SP 303 Fix
PostPosted: Tue Feb 06, 2018 2:22 am 
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Joined: Tue Feb 06, 2018 2:05 am
Posts: 5
Very upset just bought a 303 and 2 of the knobs are not functioning. Would appreciate any advice on how to go about fixing, do i just have to resolder or to buy new knobs/potentiometers, and where would i find them?
Thank you in advance


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 Post subject: Re: SP 303 Fix
PostPosted: Sun Feb 11, 2018 5:34 am 
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Joined: Sat Dec 23, 2017 5:44 am
Posts: 41
It would be dependent on what knobs are not working and why. You are going to have to open that b*tch up like a virgin on prom night.
If the solder joints are broken then yes you can just reheat them (that problem plagues old korg products due to lead free solder).
If the pots are bad I believe the correct parts are as follows (this is from my research as I could not find a definitive answer and roland apparently will no longer help consumers with internal parts) (I am also posting this for my own record incase I need these parts again, so buy, try, and solder at your own risk).

Volume Pot:
Alps RK09K12C0A2s
Control Pot(s):
Alps RK09D1130C1B

These are the two part that I found closest to the originals for a 404 which should be the same for the 303. As for the control knobs, I have no idea what the Ohms (i believe originally 50k ohm, part number above 10k ohm), Taper, etc. should be.
Above is the best information that I have found from my research. If I end up replacing the control knobs with what is listed above I will post back.


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 Post subject: Re: SP 303 Fix
PostPosted: Mon Feb 12, 2018 5:54 pm 
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Joined: Tue Feb 06, 2018 2:05 am
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I see, so does it make a difference if you use lead free solder or not? Thanks


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 Post subject: Re: SP 303 Fix
PostPosted: Sun Feb 18, 2018 2:12 am 
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Joined: Sat Dec 23, 2017 5:44 am
Posts: 41
Lead free solder heats up quicker and flows better and supposedly makes a stronger bond. And gives you some sort of cancer, or metallic lung disease. I'm not even good enough to be called a novice when it comes to soldering so you will have to do your own research concerning chemical composition of solder if that's your jam.

As for the important question.

Both pot below work as they should with the sp-404
Volume Pot:
Alps RK09K12C0A2S (50k omhs)
Control Pot(s):
Alps RK09D1130C1B (10k omhs)


The pots for the Sp-202 should be:
Control: Alps RK09D1130A1N
Volume: Forgot to see if it was a three post pot when I had it cracked open.

The pots for the sp-303 should be:
Volume: Alps RK09K12C0A2S (50k omhs)
Control: Alps RK09D1130C1B (10k omhs) Should be 50k (according to the service manual but I can't find the equivilant) I haven't cracked the 303 open so I'm not sure. Buy try and solder at your own risk.

haven't checked the EMX pots yet. If anyone wants to start a go fund me page for a proper soldering iron for me it would be appreciated and i will put this long searched for mystery for emx/esx replacement pots to a rest.


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