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P6 / tuning / patches promlem

P6 / tuning / patches promlem

2014-08-29 by jacklane@sbcglobal.net

Hi all,

I was recently given a polysix by somebody that claimed it was broken. I took it into the local shop in St. Louis, Missouri and sure enough it had the dreaded battery leak issue and required extensive re doing of the traces on the board. The tech was able to "successfully" do it but… Still is unplayable because the tuning is way off.... I was able to "successfully" load factory patches from the wav files that are floating around the net but... it still does not sound right because of the tuning issue. I get the feeling the solution is more involved than just calibrating the tuning because it seems like entire banks of sounds sound similar. Really I was thinking that if the machine was totally healthy, after loading in factory sounds, they should sound much more different from one another....  electric piano, strings, bass.... etc. But I am not getting any of these "regular" sounds at all.  I am really hoping most of the hard work is already done with the repaired traces etc. and would love to get this up and running. Any ideas? Please and thanks!

Jack


Re: P6 / tuning / patches promlem

2014-09-02 by jacklane@sbcglobal.net

If the upper address lines to the SRAM are not all connected,
some of the patches would be repeated.   I don't think the code
that reads patches from cassette and writes them into RAM does
any kind of check.
 
The RAM is right near the part of the board where the battery
damage occurs.
 
Bob 


Thanks Bob, I checked all the lines… They seem to be tightly fit. Nothing loose. Also I just did the tuning procedure and I can get all 6 voices tuned to the same note but then the octaves are off. I then learned that this should be in test mode but then when I restart I get this really distorted sound and two of the program lights are on and can't get a clean sound to tune. So I have to take it out of test mode.

Jack