: Open the unit and clean the gold contacts on the PCB and the black carbon dots on the rubber strips using high-percentage isopropyl alcohol and cotton swabs.
: The manual specifies precise voltage levels at various "test points" on the power supply and main board. This allows for accurate diagnosis of issues where the unit may not power on at all. Common Repairs Addressed by Service Manuals roland juno di service manual work
If you're interested in learning more about the Roland Juno Di or want to explore additional resources, here are a few suggestions: : Open the unit and clean the gold
By combining the Roland Juno Di service manual with these additional resources, you'll be well on your way to becoming a Juno Di expert and getting the most out of your instrument. Common Repairs Addressed by Service Manuals If you're
: Preset memory (640 patches, 20 rhythm sets) and User memory (128 patches, 2 rhythm sets).
When a key fails, the manual correctly identifies that the issue is rarely the rubber contact itself, but the PCB's carbon interdigitated traces beneath. The solution? "Clean with isopropyl alcohol and a lint-free swab." However, the manual does not mention that after 5 years, the carbon coating on the PCB begins to flake. At this point, the manual’s only solution is "Replace Keyboard PCB" —a part that Roland no longer manufactures.