Interface circuit and analog circuit. Any electronic conversion, load conversion, signal conversion can be included in the interface circuit, which can include level conversion drive, display drive, long-line interface, voltage comparator, Schmitt trigger device, A / D, D / A and Dedicated circuits, etc. Analog circuits can include integrated op amps, integrated regulated power supplies, time-base circuits, phase-locked circuits, audio circuits, and dedicated circuits. The functional characteristics of such products are only found in the device manual or in the relevant materials according to the model number. Analog integrated circuits.

ASIC and thick film circuits. This refers to a non-standard product manufactured by a manufacturer for a certain function, which is often used only in the products of the manufacturer and is not sold. Some products have regular models, but many device manuals can't find them. Some products have no formal models, only code names. Maintenance personnel are the most troublesome for such devices. The information provided by the manufacturer can also be analyzed, but often the data is only covered by a block diagram or symbol, and the logic principle or circuit is not known. Maintenance personnel can only slightly estimate their function through the analysis of the overall line. In summary, in terms of CNC machine tools, maintenance personnel need to be good at understanding the ideas and methods of the original design, and also have the ability to judge, analyze and eliminate faults. In particular, be familiar with the types, specifications, working principles and application conditions of the identified components in order to find reasonable replacement components and complete the repair of the equipment. Therefore, for the engineering and technical personnel of the maintenance profession, it is necessary to study hard, persist in learning, be brave in practice, develop good work habits that are diligent in recording, and constantly summarize and summarize, so as to accumulate more experience for improving analysis and judgment. .

Problems in Teaching After completing the "Electronic Technology" theory, students enter this topic. This content is one of the contents of the electronic circuit experiment. For the maintenance of the CNC system board, it is necessary to master this basic skill. In the teaching process, try to provide various components for the students to practice, and the teacher promptly checks the mastery and proficiency of the students. After passing the skill assessment, enter the follow-up study.

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