Discussion about the Korg PolySix synthesizer

Hi Greg,

You might want to have a look at the values of the components you have used
around the D/A converter section of the board. If you like take a nice
details Œmacro¹ shot of the board and post it where we all can see. I am
sure some eagle eyed person will be able to spot the mistake. The reason one
of the LEDs is stuck on 5 is that the full range of voltages are
unattainable from the D/A converter IC33 over the entire input bit range.
These are checked by the CPU when in test mode.

Cheers,
Andy


On 31/05/2011 23:02, "hotdogfinger25" <gregory.oconnell@gmail.com> wrote:

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> Hello!
> I recently completed one the KLM367 Clones and the MG circuit is not working
> properly. When I  turn it on the MG speed slowly ramps up to maximum speed and
> the level is stuck on "10" I did  all the bug fixes to no avail. The arpeggio
> speed is normal. Also, during the calibration found in the service manual,
> when you are supposed to make 1 and 8 light up in test mode after switching
> the tape enable on, I can only get 1 and 5 to light up.
> 
> or  {2 and 5}
> or  {3 and 5} 
> or  {4 and 5) 
> 
> Has anyone else experienced this problem? Thanks! Greg
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