Rhodes Chroma Polaris

I had the same freezing problem after installing the new membrane.  Found out that the tails on the right side drooped too low and were touching the Output board.  After I tucked them up under the right side panel, no more problems.  No more freeze ups and she's singing like a birdie.  In my case, (no pun) the tails and the board may have been too close.  Could be slightly different specs on the top and the case for different synths.  Who knows.  Nobody here seems to want to answer me about this.

Tracy




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On Thu, 7/12/18, taco taco tacosaresoawesome@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

 Subject: Re: [chromapolaris] RE: Polaris Later version Secondary board
 To: chromapolaris@yahoogroups.com
 Date: Thursday, July 12, 2018, 11:21 PM
 
 
  
 
 
 
   
 
 
     
       
       
       Hello All,I too have a Polaris which
 I’ve added new membrane panel to.Initially it
 was all frozen, gradually by power cycling (and getting to
 the tune function etc) it will go a few minutes before
 crashing in the same manner as described by
 Conor.All my voltages appear good. So Paul do you
 suggest psu ripple or faded EPROMs as probable
 causes?I calibrated my DAC (dc offset) which made
 it better but the machine still crashes without fail. I
 thought I would chime in here as it might be a common issue
 caused by ??Thanks!
 
 Sent
 from my iPhone
 On 13 Jul 2018, at
 12:15, 'Paul D. DeRocco' pderocco@...om.com
 [chromapolaris] <chromapolaris@yahoogroups.com>
 wrote:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
     
       
       
       > From: Conor Strachan [mailto:conor.strachan@...]
 
 
 > 
 
 > I am having a few issues with my Polaris, it has the
 new 
 
 > membrane panels and was working fine for over a year
 and then 
 
 > all of a sudden it started to play up.
 
 > 
 
 > It is turning on and then after about 10 seconds the
 panel is 
 
 > freezing along with the notes sustaining or gliding
 then sustaining.
 
 > 
 
 > I am consulting the service manual but there is a lot
 of 
 
 > reference to the older secondary power board and I have
 the 
 
 > later one so it is a little confusing.
 
 > 
 
 > I have checked my DC OK which I believe should be +5v
 (brown 
 
 > wire P3) but it goes to about +4.75v when it is first
 turned 
 
 > on with panel access then it fluctuates up to 4.80v and
 it 
 
 > stays around the +4.80v mark where the panel is
 frozen.
 
 > 
 
 > According to the manual it says there is no way to
 adjust 
 
 > anything on the DCOK side on the later boards. 
 
 > 
 
 > Just wondering if you have any suggestions of where to
 go next..
 
 
 
 Does it ever unfreeze spontaineously, or do you have to
 cycle the power to get it going again?
 
 
 
 I doubt it's a DCOK problem. You should check all the
 power supply voltages.. If you have access to a scope, you
 should also make sure that the supplies have no significant
 power line ripple on them. That can happen when the big caps
 on the power supply dry out.
 
 
 
 It's also possible that the EPROMs are fading. That can
 be fixed by erasing them and reprogramming them with the
 files available on the rhodeschroma.com site. If
 you don't have a programmer, and can't find someone
 nearby who does, they're available on eBay for about
 $50.
 
 
 
 I've cc-ed this to the mailing list, so that others can
 put in their two cents.
 
 
 
 -- 
 
 
 
 Ciao,               Paul D. DeRocco
 
 Paul                mailto:pderocco@...
 
 
 
 
 
     
      
 
     
 
 
 
 
 
 
 
 
 
     
      
 
     
     
 
 
 
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