Thanks again Ken. Pin 9 of all 4070s read 14.6v. I checked at the pin on the IC and on the solder side of the board.
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Check that pin 9 of the 4070 really does go to +ve. It may be floating.
>
> Ken
>
> >Thanks very much Ken.
> >
> >There's continuity between the 4070 pin 8, and the 4024 pin 12, and I
> replaced the jumper that's in the path just to make sure it wasn't those
> joints.
> >
> >There is also some anomalous behaviour in the div4 outputs. instead of
> being properly offset in phase, 3C & 2B go high/low together, and 3A & 2D go
> high/low together 180 degrees offset from 3C & 2B.
> >
> >The div8 and div16 outputs appear to be working fine.
> >
> >Thanks again,
> >Mattew
> >
> >
> >
> >
> >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >>
> >> The fault would be with a bad connection between the 4070 (pin 8) and the
> >> 4024 (pin 12). Possibly a missing link, or a bad joint or break in the
> >> track. The counter is working fine if all other outputs are behaving.
> >>
> >> Ken
> >>
> >> >i recently built the cgs master divider, and am having trouble isolating a
> >> couple of problems (possibly one problem with two symptoms).
> >> >
> >> >everything works fine, except: 2A stays at 5v, and 2C stays at 0v. the
> >> other "2" divisions work fine.
> >> >
> >> >i swapped out the transistors related to those outputs, as well as swapping
> >> the 4070, no change. continuity has been checked from the output at the
> >> jack/led to the chips. the leds light/jacks work when plugged into other
> >> outputs.
> >> >
> >> >i'd be appreciative of any suggestions for further investigation, and
> >> welcome the opportunity to learn from whatever mistake i might have made (or
> >> from the remote chance that a part may be defective).
> >> >
> >> >thanks,
> >> >matthew
> >> >
> >> >
> >> >
> >> >------------------------------------
> >> >
> >> >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/>
> >>
> >
> >
> >
> >
> >------------------------------------
> >
> >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/>
>