Korg Forums

That's a good idea, xmlguy. I'll give it a try. In my R3 case, both the right channel output and the right channel on the phones output got muted. Even so, it's a good test, it might be related. EDIT: Headphone output isn't affected when a cord is plugged on the L out. I'll try the test again in ...

The output board has 3 kinds of ICs. There's a BAJ0BC0 voltage regulator and two kinds of amp-ops from JRC: 4580 and 4556AD. The latter seems to be only used for the headphones output. Every other amp-op is a 4580. Board ID seems to be KLM-2731 - I wonder if it would be possible to order one ...

axxim wrote: Edit: If smomeone is thinking of opening the R3 by himself, please take detailed pictures of the electronic board so we can see what is inside (specially the output section!)

Will do if I need to open it again. Is it ok to share those pictures here (i.e. won't Korg object)?

If possible, could you share their answer here? My R3 left and right channels died this weekend. Decided to check the synth's amp board. Very easy to get to - just remove every screw on the bottom and it comes loose. Taking three more screws off the back and disconnecting some cables I could take ...

My R3 also has the same problem, couldn't get it fixed and the warranty is expired. Seems to be a fairly common problem. Both the R output and headphones' right channel are busted.

My R3 has a similar problem, but it's intermittent. It also seems to affect volume. Sometimes it goes away if I reconnect my headphones or change the 1/8" to 1/4" jack adaptor. This suggests it's just a bad connection or adaptor, but even the right channel output dies when the phone's right channel ...