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Jupiter 8 Troubleshooting!!
Old 4 days ago
  #1
Gear Maniac
 

Jupiter 8 Troubleshooting!!

I have spent many hours scouring the forum(s) for some answers, and have found some to many of my questions, but I figured I would employ the help of the wonderful community here at Gearslutz for some of the issues.

SO, I have a Jupiter 8, 12bit. I am about to order the caps for the PSU, and get that guy in spec, but I have a few other issues I need help resolving:

1. Voice 4 is having filter issues. Sometimes it sounds like it is just duller than the other voices, other times, it sounds like it isn't following the same envelope at the other voices.

2. Voices 5-8 have a strange issue. When VCO Mod is engaged and the fader is pushed up, these voices will bend up almost a whole semitone without the LFO trigger being depressed. The same happens with VCF Mod -- it will open up the filter slightly when the fader is pushed up.

3. Some voice bleed / background noise. I understand that there was a service note about this -- cutting the ground trace & soldering in a 100ohm resistor. I have looked at the diagrams, and my boards look a little different, so I wanted to see if I'm thinking about it correctly. I have diagrammed what I believe I should be doing...is this right?



Thanks SO much for any thoughts you folks may have!
Old 2 days ago
  #2
Gear Maniac
 

Bump! Currently going through & cleaning the beast -- about to start digging in and addressing the above issues. I'd love any help / counsel!

Thanks so much!
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