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In this video we troubleshoot and repair a dead Juno 106, that powers on but either the LEDs flicker or the display reads "8" and the synth is non-operational. The theory I touch on and process I use can easily be applied to any other microprocessor based system that isn't booting.
My desoldering tool: https://amzn.to/3PikaEf
My oscilloscope: https://amzn.to/3rm6b8d
My soldering station: https://amzn.to/3rudVF4
My smoke absorbing fan: https://amzn.to/3LvjTfM
Parts, service and synthesizers available on my website. I buy broken synthesizers!