They made their own, and it is very definitely a Japanese design
You have to be careful with the motors, many are 220 though it looks like they are 100v in
the pictures of that model
on the web
I went through the excercise of trying to find reader schematics a couple of years ago for
Japanese CNC readers and
never really found anything down to the PCB level
You also need to be careful that the pinch rollers haven't gone soft