Roland does not publicly host service manuals anymore (to protect authorized service centers). However, they are widely available through:
: While they rarely host full "service" manuals for public download, the Roland JUNO-Di Support Page provides official owner's manuals, MIDI implementation charts, and system updates (latest version 1.12). Common DIY Repair Tasks roland juno di service manual work
Whether you are cleaning sticky keys from a spilled energy drink, replacing a garbled LCD, or debugging a noisy output, the service manual is your most powerful tool. It transforms the Juno-Di from a black box of frustration into a logical, repairable system. Roland does not publicly host service manuals anymore

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