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I think there must be a school somewhere that specializes in teaching how to draw unreadable schematics. Nobody can explain what it does without component values or an idea of what the microcontroller is programmed to do.
Taking a brief overview at schematic, we can observe that is incomplete due some components are not connected to anything ( JP6, U19, ... ), and others even leaning to misunderstand ( JP11 ). Sounds as a draft resulted from a reverse engineering not yet completed.
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