Discussion about the Korg PolySix synthesizer

Hi,I can't save correctly a patch on my PolySix.I program a sound and I press the red write button which starts to blinking.After, I select a program (for example 1 ) and the sound is saved.Now, if I press again 1, the sound partially changes (the filter settings)Sounds like I can store in memory only some settings.Can be a faulty RAM issue? I have already fixed the acid leakage.Any suggestion is very appreciated.Thanks.Giorgio.

If everything else is working, you have one more trace to repair. Test for continuity the trace from pin 2 of the IC31 to the nearby thru-hole solder pad junction. I had similar issue and this trace was missed and problem solved. Also check the resistor array as these are also affected sometimes and not easy to see damage.Hope it helps.

I will check soon as possible.Thanks in advance.Giorgio.

I tested the continuity and seems to be ok.Can be a power supply issue? I read 4.6 v with the setting trimmer on full scale.Electrolytic capacitors are the original from '80s.A 50 Hz ripple is present on all waveforms...Thanks.