Robotic Arm CS113 Help

Hi to all,

CS113 is an old Robotic Arm for training and I need to design a new control board, the old is burned. My problem is that I cant find information about the stepper motors. It has 6 stepper motors and four of them are from an unknown manufacturer, Chang Shing Electric.

Please, Anyone has info about the stepper motors of this Robotic Arm or the stepper motor's manufacturer Chang Shing address?

Thanks