Instructions on how to calibrate a Roland Juno-106 or HS-60 have been posted on the Syntaur site here.
"This procedure will walk you through the process of calibrating (tuning) a Roland Juno-106 (or HS-60) synthesizer. It requires a voltmeter, a frequency counter or tuner, and an oscilloscope. It also requires working on the keyboard with the power on and the power supply exposed, so this calibration should not be attempted unless you are confident in your abilities to work safely, and to use the necessary equipment.
Note that any time you replace a voice chip on your synthesizer, you will need to recalibrate at least that voice.
Make sure the keyboard has been powered on for at least 10 minutes to warm up prior to any calibrations, and perform the calibration steps in the order they are listed here."
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