> From: paul@...
>
> I’ve come to find the problem is bigger than I realized. When
> I first turn on the Chroma Polaris I can play a few notes and
> then about 5 notes in the note gets held / stuck and the
> entire synth is locked up and unresponsive. It has the new
> membrane panels on it and had been fully restored about two
> years ago. But somewhere around 5 to 10 seconds after being
> turned on it locks up. Prior to that point all membrane
> buttons appear to work and the sounds are correct. I’ve tried
> lower function 12 to reset it but that doesn’t change
> anything. Is there anything I should re-seat or switch the
> battery out or other troubleshooting I could do. Recently
> this was working fantastically so this is a disappointment.

If you have the older version of the power supply with the LED on it, the first thing is to see if the LED goes out when the instrument freezes. If that's the case, it's merely a matter of readjusting the related trimmer R17 by turning it a few degrees to the right.

If the LED is still on, the next possibility is that the EPROMs have faded. If you have access to an EPROM eraser and programmer, you can simply reprogram them, using the files from the rhodeschroma.com web site.

There are lots of other remote possibilities, which can require test equipment to diagnose. I have a Polaris that only starts up about 50% of the time, but if it starts up it continues to run fine. I haven't been able to figure that one out, even with a scope, and I designed the damn thing.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...