Hi Delaware Dave, it's not as simple as you'd think, that is a link to a photo of the title page requiring a subscription for download. (unhappy face emoji goes here). It's offered through another link as a photocopy for $29.99... If a free PDF of the full document is available elsewhere I've never found it. There is a 'Troubleshooting Manual' for the KN1200 but in French.
John, search instead for "Technics AC1200 User Manual". This was the synth module part of your keyboard reconfigured and sold as a separate unit:
Instructions for the KN1200 would be identical, the SM-AC1200 only missing the MANUAL PERCUSSION section (that doesn't do much) and keyboard components PITCH BEND and MODULATION that are simple to use.
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