Hello synth nerds! Two voices (3 and 6) my JX-3p have a low pitched buzzing to them when I first power it on, and it takes about 10 to 20 minutes for it to fade away. I’m trying to refurbish this unit and recently replaced a few NAND chips on three channels (3,4,5) to get them working, but I assume this is not the cause. I’m wondering if anyone can give me some advice on where to search next. Could this sort of issue be caused by old capacitors or resistors warming up on channels 3 and 6? Or perhaps the oscillator chips? I’ve never heard of DCO synths needing time to settle.
Any advice appreciated.