Cgs synth

On 10/28/10 2:19 PM, russma04 wrote:
> When I plug in the VCS and measure the power pins from the bottom of the PCB, I don't get + and - 15v, I get much smaller amounts.
>
> Also, when the VCS is plugged in, my dotcom Q960 doesn't work at all.
>
> No smoke, nothing seems to be getting hot.
>
> Any ideas?
>
> Thanks
>
>
>
> ------------------------------------
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
> Yahoo! Groups Links
>
>
>
>

>When I plug in the VCS and measure the power pins from the bottom of the

>
>Also, when the VCS is plugged in, my dotcom Q960 doesn't work at all.
>
>No smoke, nothing seems to be getting hot.
>
>Any ideas?
>
>Thanks
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>

--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Backwards chip?
>
> It sounds like your PSU is going into current limit/shutdown when switched
> on, due to the excessive load.
>
> Ken
>
> >When I plug in the VCS and measure the power pins from the bottom of the
> PCB, I don't get + and - 15v, I get much smaller amounts.
> >
> >Also, when the VCS is plugged in, my dotcom Q960 doesn't work at all.
> >
> >No smoke, nothing seems to be getting hot.
> >
> >Any ideas?
> >
> >Thanks
> >
> >
> >
> >------------------------------------
> >
> >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/>
>

On 29 October 2010 01:34, russma04 <russm@...> wrote:
>
>
>
> Thanks Richard and Ken. Unplugged power pin resistance measures 5K and 58K. No backwards chips. What else would cause the excessive load?
>
> --- In cgs_synth@yahoogroups.com, sasami@... wrote:
> >
> > Backwards chip?
> >
> > It sounds like your PSU is going into current limit/shutdown when switched
> > on, due to the excessive load.
> >
> > Ken
> >
> > >When I plug in the VCS and measure the power pins from the bottom of the
> > PCB, I don't get + and - 15v, I get much smaller amounts.
> > >
> > >Also, when the VCS is plugged in, my dotcom Q960 doesn't work at all.
> > >
> > >No smoke, nothing seems to be getting hot.
> > >
> > >Any ideas?
> > >
> > >Thanks
> > >
> > >
> > >
> > >------------------------------------
> > >
> > >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/>
> >
>
>


--
/Ove

-----BEGIN 2ROT13 MESSAGE-----
Blog: <http://blog.gg8.se/>
Sätt på ett par flipflops, vippa på rumpan
och gör det här till en minnesvärd sommar!
-----END 2ROT13 MESSAGE-----

On 10/29/10 7:29 AM, Ove Ridé wrote:
> Is the power header correctly mounted to the board and connected?
>

--- In cgs_synth@yahoogroups.com, "russma04" <russm@...> wrote:
>
> When I plug in the VCS and measure the power pins from the bottom of the PCB, I don't get + and - 15v, I get much smaller amounts.
>
> Also, when the VCS is plugged in, my dotcom Q960 doesn't work at all.
>
> No smoke, nothing seems to be getting hot.
>
> Any ideas?
>
> Thanks
>

--- In cgs_synth@yahoogroups.com, Richard Brewster <pugix@...> wrote:
>
> Very good point. The CGS75 board has the orientation of the 4-pin MOTM
> MTA header facing IN, so that if you use a standard MOTM power cable,
> the wires exit on the inside, going back over the board components.
> This is the reverse of MOTM boards.
>
> Richard Brewster
> http://www.pugix.com
>
> On 10/29/10 7:29 AM, Ove Ridé wrote:
> > Is the power header correctly mounted to the board and connected?
> >
>

On 29 October 2010 19:36, russma04 <russm@...> wrote:
> Wow. That you so much for all your help folks.
>
> I did indeed have the MOTM power header installed backwards. So I re-installed it correctly and it no longer pulls down the Q960, and the pins measure +/-15v.
>
> I haven't had time yet to test all the other functions, I just wanted to give this update and say thanks.
>
> Russ M.
>
> --- In cgs_synth@yahoogroups.com, Richard Brewster <pugix@...> wrote:
> >
> > Very good point. The CGS75 board has the orientation of the 4-pin MOTM
> > MTA header facing IN, so that if you use a standard MOTM power cable,
> > the wires exit on the inside, going back over the board components.
> > This is the reverse of MOTM boards.
> >
> > Richard Brewster
> > http://www.pugix.com
> >
> > On 10/29/10 7:29 AM, Ove Ridé wrote:
> > > Is the power header correctly mounted to the board and connected?
> > >
> >
>
>


--
/Ove

-----BEGIN 2ROT13 MESSAGE-----
Blog: <http://blog.gg8.se/>
Sätt på ett par flipflops, vippa på rumpan
och gör det här till en minnesvärd sommar!
-----END 2ROT13 MESSAGE-----

On 10/29/10 1:51 PM, Ove Ridé wrote:
> That's not good for either the power supply or the module. The power
> supply might take damage from the overload (although good linear
> regulators should have various shutdown mechanisms.) It's also not
> good for the module since transistors (including those in ICs) have a
> tendency to break down when you apply a reverse voltage. Definitely
> watch out for weird behavior in the future.
>
> On 29 October 2010 19:36, russma04<russm@...> wrote:
>> Wow. That you so much for all your help folks.
>>
>> I did indeed have the MOTM power header installed backwards. So I re-installed it correctly and it no longer pulls down the Q960, and the pins measure +/-15v.
>>
>> I haven't had time yet to test all the other functions, I just wanted to give this update and say thanks.
>>
>> Russ M.
>>
>> --- In cgs_synth@yahoogroups.com, Richard Brewster<pugix@...> wrote:
>>> Very good point. The CGS75 board has the orientation of the 4-pin MOTM
>>> MTA header facing IN, so that if you use a standard MOTM power cable,
>>> the wires exit on the inside, going back over the board components.
>>> This is the reverse of MOTM boards.
>>>
>>> Richard Brewster
>>> http://www.pugix.com
>>>
>>> On 10/29/10 7:29 AM, Ove Ridé wrote:
>>>> Is the power header correctly mounted to the board and connected?
>>>>
>>
>
> --
> /Ove
>
> -----BEGIN 2ROT13 MESSAGE-----
> Blog:<http://blog.gg8.se/>
> Sätt på ett par flipflops, vippa på rumpan
> och gör det här till en minnesvärd sommar!
> -----END 2ROT13 MESSAGE-----
>
>
> ------------------------------------
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
> Yahoo! Groups Links
>
>
>
>