Every technical system, including nuclear power plants, needs to be serviced regularly for regular and safe operation. Non-destructive testing methods are used for the inspection of key parts of nuclear power plants to detect possible cracks or material anomalies in a timely manner. High radiation zones prevent people from staying inside the power plant for a long time, which is why robots are needed to conduct non-destructive testing. This paper describes the method of defining and developing a global wiring diagram of the manipulator „Target-20- R“ by company INETEC, as well as the distribution of the pneumatic pipes and connections for the realization of all functions needed. By defining electrical components and creating a table in which characteristics are listed such as voltage and signal lines, maximum current, and power of components. By inspecting the content of the table and also according to the criteria of maximum current and voltage, cables and connectors are selected. Wiring and pipes distribution diagrams were made in the AutoCAD Electrical software and attached as a supplement to this final paper. The second part of the final paper is the design of an electronic printed circuit board (PCB) for regulating the pressure of the manipulator housing. It is necessary to achieve a constant overpressure of the housing in order to protect the control units inside the manipulator housing from water leakage. The design of the bord is carried out in the software Altium Designer 20. in which various functions are described and files, required for the production of the printed circuit bord, are prepared. Ordering and soldering procedures are also described and in the end safe testing process is explained so that a possible manufacturing error would not result in the destruction of the PCB.