Principle and function of PCB copy board
What is PCB copy board
PCB copy board, that is, under the premise that there are already physical objects of electronic products and circuit boards, reverse analysis of the circuit boards by reverse research and development technology, and the original product PCB files, bill of materials (BOM) files, and schematic files Perform a 1:1 restoration of technical documents and PCB board silk screen production documents, and then use these technical documents and production documents to perform PCB manufacturing, component welding, flying probe testing, circuit board debugging, and complete the complete copy of the original circuit board template.
Since electronic products are composed of various types of circuit boards, the core control part performs work. Therefore, the use of a process of PCB copying can complete the extraction of a full set of technical data of any electronic product and the imitation and cloning of products.
PCB copy board method
The first step is to disassemble the board: when you get a PCB, you must first analyze it. In what way is this board used? What should we pay attention to when we dismantle the board? Then record the model, parameters, and position of all vital parts on the paper, especially the direction of the diode, the three-machine tube, and the direction of the IC gap. It is best to use a digital camera to take two photos or scanned pictures of the location of vital parts for future debugging.
The second step is to clean and scan the PCB board: remove all the components and remove the tin from the PAD hole (in this step, everyone must pay attention to the fact that some PCB pads also have holes). Clean the PCB with alcohol, and then put it in the scanner. When the scanner scans, you need to raise the scanned pixels slightly to get a clearer image. Start POHTOSHOP, scan the silk screen surface in color, and save the file And print it out for later use.
The third step is to polish the board: lightly polish the two layers of TOP LAYER and BOTTOM LAYER with water gauze paper until the copper film is shiny, put it in the scanner, start PHOTOSHOP, and scan the two layers separately in color. Note that the PCB must be placed horizontally and straight in the scanner, otherwise the scanned image cannot be used, and the file should be saved.
The fourth step is to adjust the PCB: adjust the contrast and brightness of the canvas to make the part with the copper film and the part without the copper film have a strong contrast. Check if the lines are clear, if not, repeat this step. If it is clear, save the picture as black and white BMP format files TOP.BMP and BOT.BMP. If you find any problems with the graphics, you can also use PHOTOSHOP to repair and correct them.
The fifth step, drop the picture: use the copy board software to drop the picture you just found into the PROTEL file, and start copying according to the picture above. Before copying, you need to measure the PCB size for later trouble.
The sixth step, copy the PCB picture: When copying the picture, it must be clearly distinguished if the two layers are TOP and BOT. When copying the board, use the top overlay layer for the characters on the TOP layer, and use the bottom overlay layer for the characters on the BOT layer.
The seventh step, check: After reading this way, check carefully again to avoid problems such as loss of line and disconnection.
The role of PCB copy board
Many people have misunderstood the concept of copy board. In fact, with the continuous development and deepening of the circuit board industry, today's circuit board copy board concept has been extended to a wider range, and is no longer limited to simple circuit board copying. The cloning will also involve the secondary development of products and the development of new products.
For example, through the understanding and discussion of existing product technical documents, design ideas, structural features, and process technology analysis. It can provide feasibility analysis and competitive reference for the design of new products, and assist R&D and design units to follow up in time. Technology development trend, timely adjustment and improvement of product design, research and development of the most competitive new products.
At the same time, the process of board copying can realize the rapid update, upgrade and secondary development of various electronic products through the extraction and partial modification of technical data files. According to the document drawing and schematic diagram extracted from the copy board, professional designers can also optimize and modify the PCB according to the wishes of the customer, and add new or redesigned functions to the product, so that the product has new functions. The function will appear at the fastest speed and new posture. Not only has its own intellectual property rights, but also won the first opportunity in the market, custom pcb assembly bringing double benefits to customers.