Rhodes Chroma Polaris

BTW, it simply won't let me do some of the tests.  I'll revisit it again in the near future.  Try to write down the states and outcomes.  I tried to follow some of the diagnostics, in the order they are written.  My weakest point in repair is a MM or scope.  Should have taken that electronics class!

Tracy




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On Tue, 5/29/18, 'David Clarke' ac151@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

 Subject: Re: [chromapolaris] Anyone Home?
 To: "chromapolaris@yahoogroups.com" <chromapolaris@yahoogroups.com>
 Date: Tuesday, May 29, 2018, 1:05 PM
 
 
  
 
 
 
   
 
 
     
       
       
       > ... It has been very quiet here and I've
 asked some questions. since 
 
 > I haven't received any answers or queries, I
 figured I'd ask...
 
 
 
 Speaking only for myself, I suspect that there haven't
 been many replies for two main reasons:
 
 
 
 1) It isn't really clear what the 'problem'
 is
 
 2) It was already noted that "...No o-scope...am no
 repair tech"
 
 
 
 First - without having a good description of what is really
 happening (under a controlled setup) there's no easy way
 for anyone to make a meaningful suggestion as we don't
 know exactly what you're doing (hence what you should be
 seeing).
 
 
 
 Second - most of these sorts of issues are 'easy' to
 diagnose if you can follow the signal with a meter and/or
 scope - but if that's not going to be possible, then as
 much as folks might want to help, it becomes very difficult
 (and not very likely) that some sort of generalized 'do
 this and you'll be OK' comment can be made.  
 
 
 
 Some thoughts as to how it might make it easier for people
 to help.
 
 
 
 First - start with a 'standard' configuration that
 other's can duplicate/evaluate.
 
 
 
 For instance - let's start with a 'scratch'
 patch.  Select patch A1 (for instance).  Then select Upper
 Function, Erase Prog, and select "1".  Now, when
 you press the "A" bank, you should see that A1
 isn't lighted.  Select A1 and you will year a
 'basic' sound.
 
 
 
 You can then document what specific settings you are making
 - for instance:
 
 
 
 Osc 2 Sync button on
 
    Cutoff Slider to 3/4
 
 
 
 Now - if some concerns are being seen with the Resonance
 slider, you can describe what that means/how you see it.
 
 
 
 For instance - if with this setup perhaps you don't seem
 to start to hear any change until the resonance slider has
 been moved about 1/2" and/or perhaps you don't
 happen to hear any further changes when the slider is in the
 last 1/2" of travel or so - then this is likely
 'normal'.
 
 
 
 It is important to keep in mind that the Polaris doesn't
 have direct analog control of the parameters.  That means
 there are a finite number of selection that the sliders will
 give you.  Some have more, some have less.  For Resonance,
 there are expected to be a total of 8 levels.  So - whether
 or not there is a 'dead zone' at the top and bottom
 of the sliders, the key is whether you can hear 8 different
 settings as you go through the range of the slider.  If you
 do (and if it is increasing/decreasing in the moved
 direction) then likely all is well.
 
 
 
 Please note that a 'clean slider' doesn't
 necessarily mean a 'good slider'.  It is absolutely
 possible to have a worn-out or loose slider that feels good,
 and slides nice, but it may not actually be making the
 contact as it should. You can use a simple multi-meter to
 measure the voltage from the middle connection of the pot,
 to see if the voltage does cleanly slide from 0v -> 5V as
 the slider is moved from one end to the other.  If the value
 jumps, or is erratic - then further attention is required to
 the actual slider.
 
 
 
 Note - it would be expected that all of the items in the
 "Adjustments and Checkout" section of the Polaris
 Service Manual would be reviewed and checked.
 
 
 
 Good luck with your efforts - and hopefully with a few more
 concrete observations the people on the list will be able to
 give some more concrete suggestions.
 
 
 
 David Clarke
 
 
 
     
      
 
     
     
 
 
 
 #yiv7338490372 #yiv7338490372 --