Example D — Blank or garbled display
Illuminates every pixel on the screen and fires up every button LED to check for dead display segments or failed surface-mount lights.
Remove the screws securing the keybed assembly to the upper chassis. roland juno di service manual work
Work on an anti-static mat. Wear a grounded Electrostatic Discharge (ESD) wrist strap to protect the main circuit boards from static shocks.
Once open, do not immediately desolder anything. Use a multimeter. Example D — Blank or garbled display Illuminates
Measures the current voltage delivery from the battery compartment to verify the internal regulator circuit. 3. Disassembly Procedure
Here is what you can expect to find in the service manual, based on typical Roland documentation structures: Wear a grounded Electrostatic Discharge (ESD) wrist strap
To verify your work, enter the factory test mode outlined in the Roland service manual. While holding down specific buttons (commonly a combination of , Exit , or specific category buttons) turn on the power. This diagnostic mode allows you to systematically test: Every single LED and button contact. Keybed velocity curves and individual key contacts. The LCD screen pixel grid. ROM/RAM integrity and MIDI/USB input/output loops.
Juno-Di: Restoring the Factory Setting. - Roland Corporation
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