[sdiy] akai encoder

[karl dalen]

--- "Byron G. Jacquot" <thescum at surfree.com> wrote:
> > I have an Akai S5000 with an encoder problem. When I turn it to the
> > right, sometimes everything is fine, sometimes the value goes down. I
> > took out the 21 screws and touched up the solder, but that didn't
> > help. I'm thinking I'll replace this thing, am I right to assume this
> > is the Alpha brand encoder (318-ENC160-24P) in the Mouser catalog?
> > 
> > anyone ever have this problem?
> 
> I've seen this problem a few times, in several different.
> 
> It's usually due to a defect in the encoder design.  If the encoder 
> output transistions and the mechanical detents all happen at the same 
> point, then as the detent mechanism wears out, it's messes up the 
> transitions on the output.  I think the detents were becoming 
> slightly wider, making it so that the tactile "click" of the encoder 
> didn't relate the the output edges.  
> 
> It reaches a point that whichever direction it's turned, the output 
> value only seems to go one direction...like a ratcheting mechanism.
> 
> I saw this happen to some cheap-o encoders in a matter of weeks.
> 
> The solution was to replace the cheap encoders with more expensive 
> ones, where the detents are halfway in between the output state 
> changes.  I think we wound up using Alps encoders.

Do you have the ALPS part number?

REG
KD

 
> Byron Jacquot
>