Plotting device of schematic diagram of circuit board

Abstract

The invention discloses a plotting device of a schematic diagram of a circuit board. The device comprises a numerical controlled host, a tester, and a flexible needle bed. Key points of the design of the device are as follows: the tester is connected with the flexible needle bed through a cable; the tester is composed of a backboard, a channel board, a power supply module, and a cabinet; a socket is arranged on the backboard; the channel board is vertically plugged on the backboard through the socket; the backboard is connected with numerical controlled host through a USB cable; and the channel board is connected with the flexible needle bed through the socket. According to the invention, the device has advantages of fast testing speed, high accuracy, good university, and strong anti-interference property and the like.

Description

technical field [0001] The invention relates to an electronic test device, in particular to a circuit board principle diagram surveying and drawing device. Background technique [0002] Currently, electronic devices are widely used in many industries and sectors and play a vital role. Electronic equipment is generally composed of various circuit boards, which have the characteristics of high technical content and high failure rate. Once a failure occurs, it will have a significant impact on the normal operation of the equipment and must be repaired in time. However, because many equipment, especially imported equipment, often lack schematic drawings, the equipment cannot be repaired, the equipment cannot be operated, and great losses are caused. Therefore, it is urgent and necessary to obtain circuit board schematic diagrams to guide repair work. [0003] At present, there are mainly grinding methods, observation methods, manual testing methods, and fixed needle bed testing...

AI Technical Summary

Problems solved by technology

The grinding method is to remove the components of the circuit board, then polish the circuit board, and take a photo for each layer of grinding until all the layers of the circuit board are polished, and draw the circuit schematic diagram according to the imaging of each layer. This method requires Completely destroying a set of circuit boards is expensive and difficult to implement under normal circumstances; the observation method is to observe the wiring on the circuit board with the naked eye, and then draw it manually. This method is often suitable for less complicated single-panel and double-layer boards. It is not applicable to more and more multi-layer boards; the manual test method is to use the ohm file of the multimeter to test the resistance between the pins of all components on the circuit board under test. If the resistance between the two pins If it is less than a specific value, it can be considered as conduction between two points, otherwise it is non-conduction. This method does not damage the circuit board and is also suitable for multi-layer boards, but the workload is heavy and the error rate is high; fixed needle bed test The method is to use a bed of needles to fix the circuit board, and then use optical imaging to draw the pin distribution map of the electronic components on the circuit board under test, and then make the corresponding channel board according to the distribution map for positioning the test probe, and finally Under the control of the test software, the test host sends test instructions for testing. This test method has fast test speed and high accuracy. However, this method requires the production of special channel boards and test software for each electronic spare part to be tested. The system is huge, High cost, long production cycle, poor versatility, unable to carry out large-scale promotion and application

CN200820227738.1 discloses a circuit board schematic diagram surveying and mapping system. This design has strict requirements on the volume, especially the height, of various bus interface components and analog switching devices used. The system has poor anti-interference ability and unstable operation

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