Any adapter which has the same output (volts, amperes), connector and polarity could work - inside the instrument there are regulators so I think they would deliver proper voltages to internal circuits.
Maybe yours will work too, when you will set proper voltage +5 Volt with VR1 in regulator circuit. -5 Volt rail seems to be allowing more tolerance - according to the point 1 it can be between -4.7 ~ -5.7 Volt. Just try it. If voltages will be out of spec, you should try different adapter, more near to the original one.
Daniel Forro
On May 16, 2017, at 8:18 PM, purpurinisukutis@... [korgpolyex] wrote:
Few steps in adjustment procedure consists of measuring voltage while using original 9V, 300mA AC adapter, however when i bought the synth i got not original power supply - its 8.5V, 350 mA. Do you think that i could use that one for this procedure, or do i need to buy specificly 9V, 300mA AC adapter? If original adapter is needed, maybe you know some alternatives for it?