How does the PCB copy the board?
The technical realization process of PCB copy board is simply to scan the circuit board to be copied, record the detailed component location, and then remove the components to make the bill of materials (BOM) and arrange the material purchase, and the empty board is The scanned picture is processed by the copying software and restored to a pcb board drawing file, and then the PCB file is sent to the plate making factory to make the board. After the board is made, the purchased components are soldered to the made PCB board, and then the circuit board is tested And debugging.
The first step is to get a PCB. First, record the model, parameters, and positions of all vital parts on the paper, especially the direction of the diode, the tertiary tube, and the direction of the IC gap. It is best to use a digital camera to take two photos of the location of the vital parts. The current PCB circuit boards are getting more and more advanced. Some of the diode transistors above are not noticed at all.
The second step is to remove all the multi-layer boards and copy the boards, and remove the tin in the PAD hole. Clean the PCB with alcohol and put it into the scanner. When the scanner scans, you need to raise the scanned pixels slightly to get a clearer image. Then lightly polish the top and bottom layers with water gauze until the copper film is shiny, put them in the scanner, start PHOTOSHOP, and scan the two layers in separately in color. Note that the PCB must be placed horizontally and vertically in the scanner, otherwise the scanned image cannot be used.
The third step is to adjust the contrast, brightness and darkness of the canvas to make the part with copper film and the part without copper film have a strong contrast, then turn the second image into black and white, and check whether 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 fourth step is to convert the two BMP format files to PROTEL format files, and transfer two layers in PROTEL. For example, the positions of PAD and VIA that have passed through the two layers basically coincide, indicating that the previous steps are well done. If If there is a deviation, repeat the third step. Therefore, PCB copying is a work that requires patience, because a small problem will affect the quality and the degree of matching after copying.
The fifth step is to convert the BMP of the TOP layer to TOP.PCB, pay attention to the conversion to the SILK layer, which is the yellow layer, and then you can trace the line on the TOP layer, and place the device according to the drawing in the second step. Delete the SILK layer after drawing. Keep repeating until all the layers are drawn.
The sixth step is to import TOP.PCB and BOT.PCB in PROTEL, and it is OK to combine them into one picture.
The seventh step, use a laser printer to print TOPLAYER and BOTTOMLAYER on transparent film (1:1 ratio), put the film on the PCB, and compare whether there is any error. If it is correct, you are done.
A copy board that is the same as the original board was born, but this is only half done. It is also necessary to test whether the electronic technical performance of the copy board is the same as the original board. If it is the same, it is really done.
Remarks: If it is a multilayer board, you need to carefully polish to the inner layer, and repeat the copying steps from the third to the fifth step. Of course, the naming of the graphics is also different. It depends on the number of layers. Generally, double-sided copying requires It is much simpler than multi-layer boards. Multi-layer copy boards are prone to misalignment. Therefore, multi-layer board copy boards must be especially careful and careful (wherein the internal vias and non-vias are prone to problems).
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