Discussion about the Korg PolySix synthesizer

I had to set my 367 clone aside for some time and finally had a chance to get back to it. Sadly I can't get past that first step in the calibration. Patch LEDs 1-8 won't light up no matter what I do. I combed the earlier threads in the hopes of pinpointing the problem but so far it hasn't yielded results. One downside to my build here was that I originally set up headers that turned out to be problematic.

I followed the steps in an earlier thread:

- Check the continuity of the test mode switch
- Make sure C28 is correctly positioned
- Check resistive values around IC27
- Carefully examine circuitry around IC33

I checked all resistor values. Some had some dips in resistance now that they were soldered onto the board but it didn't strike me as abnormal. Numerically they checked out so I carried on.

I checked all the caps and diodes against one of my original boards.

I've started to check all the voltages on the ICs. If a scope can show me the logic pulses you refer to on CN10 I should be able to hook something up but I'm pretty new to that. I only have a probe that connects to a sound card and I'm using an app called 'Scope' [go figure :)].

Any help would be greatly appreciated. Thanks!