How to Copy a PCBPosted on 2020-07-07
What is copy PCB
Copy PCB refers to reverse technology research on the designed PCB board, also called cloning. In a narrow sense, copying only refers to the process of extracting and restoring PCB files of electronic product circuit boards and using files for circuit board cloning. Broadly speaking, copying includes not only the extraction of circuit board files, circuit board cloning, circuit board Imitation and other technical processes. Also includes the modification of circuit board files (ie, board modification). Extraction of three-dimensional data and model imitation of electronic product shape molds (ie copying). Various electronic components on electronic product circuit boards All technical processes such as imitation, decrypting the encrypted chip or single chip on the circuit board, and disassembling the system software of the electronic product, etc.
So, can PCB be copied? Does the copied effect work?
PCB can indeed be copied, and the effect is similar to the circuit board being copied. The reason for this is that the current copy PCB manufacturers can copy the same board according to the circuit board. Although it does not achieve 100% efficiency, at least 70% or 80% still exists. For customers, such a circuit board is sufficient for its use. Therefore, PCB replication is very popular in the current industry development, and it is also very popular with many electronic enterprise bosses. However, not all manufacturers can reproduce high-quality PCB boards with quality and quantity, and it is necessary to select manufacturers that meet the following conditions. Kingford is a professional copying PCB manufacturer.
The whole process of copy PCB
First, get a PCB, first record the model, parameters, and position of all vital parts on the paper, especially the direction of the diode, three tubes, and the direction of the IC gap <. It is best to use a scanner to scan two photos of the location of vitality parts, which will greatly help to restore the prototype in the future.
Second, remove all devices and remove the tin in the PAD hole. Rinse the empty PCB board with ultrasonic waves, and then put it into the scanner. Note that the PCB must be placed horizontally and straight in the scanner, otherwise the scanned image cannot be used. Then open the Photoshop software to enter the scanner, scanner After startup, the resolution of the scanning DPI can be set according to the density, if the setting is 600DPI. Scan the screen printing surface in color, and save the name to customize it. The bottom screen printing method is the same.
Thirdly, lightly polish the two layers of TOP LAYER and BOT LAYER with water-gauze paper, polish the copper film to shine, and put it into the scanner. Start the PHOTOS software, scan the two layers in color and save them. Note: The PCB must be placed horizontally and straight when placed in the scanner.
Fourth, adjust the size, contrast, and brightness of the canvas to make the part with copper film and the part without copper film have strong contrast. Then turn the sub-picture into black and white, check whether the lines are clear, and if it is not clear, repeat this step. If it is clear, save the picture as black and white BMP format files TOP.BMP and BOT.BMP.
Fifth, the two BMP format files are converted into PROTEL format files, and transferred into two layers in PROTEL. If the positions of PAD and VIA after two layers are basically coincident, it indicates that the first few steps are done well. If there is a deviation, repeat the third and fourth steps.
Sixth, convert TOP.BMP to TOP.PCB. Note: To be converted to the SI layer, it is the yellow layer. Then trace the line on the TOP layer. And place the device according to the second step drawing. Delete the SILK layer after painting.
Seventh, convert BOT.BMP to BOT.PCB. Note: To convert to SILK layer, it is the light yellow layer. Then you trace the line on the BOT layer. Delete the SILK layer after painting.
Eighth, in PROTEL, add TOP, PCB, BOT, and PCB into a single picture and it will be OK.
Ninth, the same process of copying boards in the middle layer is the same, repeat steps 6-7. The final output PCB file is the same PCB picture with multiple layers combined.
Tenth, compare the original picture with the 1:1 file after copying the PCB. If yes, you are done.
Remarks: If it is a multi-layer PCB, you must carefully polish the inner layer. And repeat the third to fifth steps of copying the board. Of course, the naming of the graphics is also different, according to the number of layers. General double-sided copy The board is much simpler than the multi-layer board. The multi-layer board copy is prone to misalignment, so the multi-layer board copy board should be particularly careful and careful (the internal vias and non-vias are prone to problems) .