Renovation technology for circuit board of numerical control system

The invention relates to a dedusting and renovation technology for a circuit board of a numerical control system, which is used for performing renovation treatments, such as dedusting, oil removing, baking and lacquering. The technology comprises the following steps: 1, performing backing up for a numerical control system program; 2, detaching the circuit board after backing up for further use; 3,cleaning the detached circuit board in a cleaning solution; 4, washing with cleaning water after cleaning with the cleaning solution; 5, bowing the cleaned circuit board to dry with a blower gun, wherein air volume of the blower gun is 3 cubic meters per minute, and diameter of an air duct is 3mm; 6, performing baking for 24 hours, and controlling temperature to be not more than 50 degrees; 7, lacquering the circuit board with conformal coating for insulating, and naturally drying for 3 hours; 8, performing installation, wire connection and system backup recovery. With the technology providedby the invention, a probl