Does anyone know anything about the Pacific Microsonics Model one?

Does anyone know anything about the Pacific Microsonics Model one?
I encountered some problems, I came across a Pacific Microsonics Model one at work friends bought online, which explained that the analog output was changed, and when I carefully checked it in my hand, I found that the DA board output is a single-ended signal, but the output buffer board input is a balanced signal, what I don't quite understand is, is the circuit incomplete or some other reason?
 

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