It was a big pain to swap these out after everything was mounted and wired but i did it and now all the buttony-buttons work.
Now to try to figure out why CPO and AEP doesnt work.
I'll focus on CPO for now since i'm not really sure what AEP is supposed to do. (i'll do some reading on this later once i have CPO working)
I have gone through the schematic and traced all part values and everything appears to be correct, but its also possible that ive missed something.
When a button is pushed the A bus goes high to 6.20v and the stage selects correctly.
When i measure the output of CPO it goes from 111mv to 201mv when the button is pushed which is obviously not high enough to trigger anything.
Any suggestions on what areas to check in the CPO circuit would be much appreciated :0
Now to try to figure out why CPO and AEP doesnt work.
I'll focus on CPO for now since i'm not really sure what AEP is supposed to do. (i'll do some reading on this later once i have CPO working)
I have gone through the schematic and traced all part values and everything appears to be correct, but its also possible that ive missed something.
When a button is pushed the A bus goes high to 6.20v and the stage selects correctly.
When i measure the output of CPO it goes from 111mv to 201mv when the button is pushed which is obviously not high enough to trigger anything.
Any suggestions on what areas to check in the CPO circuit would be much appreciated :0
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
>
> 47k, 150k, 470k, 820R 680R
>
> Cheers,
> Ken
>
> Ken
>
> >> As i mentioned earlier in the thread this is the old style boards (non
> RoHS), Just wondering at this point if there is a component value that might
> be incorrect on all 8 stage boards.
> >>
> >
> >okay, had an even closer look and i noticed that H was only going up to
> 6.7v when pressing the button so i figured this might have something to do
> with resistor values.
> >I went back over the boards and i noticed a discrepency between the
> silkscreen rev A and the picture of the rev b boards on the CGS site.
> >The row of resistors closest to the LED and diode on my board are (in order
> of closest to farthest (47k,47k,470k,820r,680r) and the CGS site with the
> revB boards (47k,150k,470k,820r,680r)
> >
> >Now to further complicate things i was following the values listed on the
> website, BUT i got the 47k and 150k REVERSED which probably explains the
> voltage drop.
> >My question here is, Which should i follow for these REV A (non RoHS)
> boards. 47k, 47k, or 47k, 150k?
> >
> >
> >
> >
> >------------------------------------
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >Yahoo! Groups Links
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>