The SY77 has a self diagnostic mode in the within an onboard ROM chip(s). This diagnostic mode is designed to help the Yamaha technician in the day and now you the synthesiser enthusiast understand what could be going on within the SY77.
While the tests are relatively basic they do cover the main functions / capabilities of the synthesiser and with a bit of luck will steer you toward the area of the synth that will need attention.
The diagnostics will help you with the:
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User interface - All buttons, knobs, faders and screen
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keyboard - Each note on the key bed
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interfaces - Primarily MIDI connectivity
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inputs - Foot pedals and switches
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outputs - Master and sub outputs plus headphones
Once executed you should be able to rule a section of the SY77 in or out of your problem.
Click anywhere on the image or title to see the work undertaken on this synthesiser.
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