I have another in perfect working order which I may use to swap out boards to try and 100% isolate the problematic board. Also note that this again is my second Roland JP-8000.
HEADPHONE JACK DISTORTED SOUND UPDATE
In any event, once I make some progress on the Roland JP-8000, I’ll update this post. The Roland JP-8080 is pretty rock solid and I would recommend that over the JP-8000 if you are looking to invest in this particular synth. Note the JP-8080 rack version uses different caps and components than the JP-8000 which maybe is a hint that Roland knew the components used in the JP-8000 were not all that great. Most likely they are going to have the distorted output problem. I’d say pretty soon we’re going to see more Roland JP-8000 synths on the used market broken. Not all synths are like this as some age better than others. It appears the Roland JP-8000 is one of those synths that is doomed to have some major failures as it ages. I am now in search of the replacement caps as shown in the photo attached to the article. However, I did find that if you change the caps on the Main Board, it does apparently fix the output distorted issue.
I’ve read that replacing the caps on the Jack board didn’t fix much anything with others who had the same problem. Thus I’m still faced with having a JP-8000 that doesn’t really produce any useable output. The OP AMP replacement seemed to have brought the jacks back to life but only to a point.
I also began getting some very bad distortion at higher levels that was very erratic. Something changed! I now started to get output out of my L and R jacks but only to a level of 2 or 3. I then ordered and changed all of the OP AMPS on the Jack Board and Board B. In addition, the headphone jack would output a good signal but only up to level 6 or 7 and would then crackle or produce a loud distorted sound.Īfter some reading and research, I first changed the battery and did a memory reset. The first was that the outputs L and R would no longer work, thus they were dead silent. Recently I acquired a second Roland JP-8000 that actually was in like new condition, but it had a couple of output problems.