Roland Jupiter4 Repair and Service

1. I got a defect JP4 rev.D for repair, one voice VCO1 wasnt working correctly. after 3 hours it was back to work.

2. a full repap of all PCBs was required due to the age.

3. removing of the battery

4. cleaning of the sliders/Faders and lubrication

5. install of the hamburger MIDI Interface

6. test and calibration

Pictures (copyright by me - DSL-man.de)