Discussion about the Korg PolySix synthesizer

Yes, that should be a good ground.   BTW, if I am interpreting the DAC pin 4 photo
correctly, It certainly looks like some data is being written to it, which would be a good
sign.    We can tell more when you get a good picture of the op amp output (in test mode).

I suggest that the first priority should be trying to determine if the 8048 is OK.    If it is, 
then we can try to determine where the problem lies.   If it's not, then you will need to 
find a replacement.    I like the idea of using the test switch as it greatly simplifies the code
loop, which will help us to understand what's happening.   The main loop is much more complicated.

Trying to troubleshoot from a distance is pretty tough, but maybe we can make some progress.

Bob

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On Mon, 7/4/16, noddyspuncture@hotmail.com [PolySix] <PolySix@yahoogroups.com> wrote:

 Subject: Re: [PolySix] Another P6 with all LED's lit....
 To: PolySix@yahoogroups.com
 Date: Monday, July 4, 2016, 2:30 PM
 
       
       Thanks for all the info Bob,
 I am using the "big black
 wire" coming from near the battery area for all my
 grounds, so I think that should be OK...?
 You've given me a lot to digest
 and go at here... I shall try and get it all sorted and
 upload more shots.
 Many thanks for your
 help..!
 Cheers,Tom