For more detailed diagrams, you can reference the community-shared JC-618 Multi-functional Digital Electronic Organ Manual or a guide on how to use the teaching/lesson modes
The JC618 uses budget switches that benefit from light lubrication. Use a thin lubricant like Super Lube 51004. Apply one small drop inside the switch stem—do not over-lubricate or keys will feel mushy. elegance jc618 keyboard manual