CS20M faders

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psygoat
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CS20M faders

Post by psygoat » Sat Jan 09, 2016 1:57 am

Hi.
I am repairing a Yamaha CS20M - the release fader is broken. It is an ALPS slider marked 10kC.
I was wondering what the 'C' is - is it log, linear or another type.
I have a copy of the service manual, but unfortunately the page with the parts list on it is not there.
Does anyone know what this is?
Thanks a lot.
M

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desmond
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Re: CS20M faders

Post by desmond » Sat Jan 09, 2016 11:57 am

There's a parts list in the CS40M manual which is broadly the same as the CS20M, but it doesn't mention what this is in there, either.

The sustain pots are "B-Type" and the release ports are "C-Type", whatever that means.

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Yekuku
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Re: CS20M faders

Post by Yekuku » Sat Jan 09, 2016 12:01 pm

C on potentiometers means anti- log (reverse logarithmic), but I have not seen a CS20 fader so I cant really say if it is anti-log or not.
Anti log faders are hard to find but you can get anti-log response by soldering a resistor across the outer lugs of a linear pot, thought its performance is dependent on the accuracy of the linear pot.

A simple test to make in order to realize if it is an anti log or not, is to put the slider on the 1/4 position of the total fader run and read the resistance. If it is aprox 2.5K then it is linear, if it is between 1-2K it is log and if it is 3-4K, it is anti-log.
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