What are the steps of board copying

- Jan 16, 2019-

The first step is to get a PCB. First, record the model, parameters, and position of all components on the paper, especially the direction of the diode, the three-stage tube, and the direction of the IC notch. It is best to take a photo of two component locations with a digital camera. The more advanced the pcb board is, the more the above-mentioned diode transistor is not noticed.

In the second step, all devices are removed and the tin in the PAD hole is removed. Clean the PCB with alcohol and put it into the scanner. When scanning, the scanner needs to slightly raise some scanned pixels to get a clearer image. Then polish the top and bottom layers slightly with water gauze, polish it to the copper film, put it into the scanner, start PHOTOSHOP, and scan the two layers separately by color. Note that the PCB must be placed horizontally and vertically in the scanner, otherwise the scanned image will not be used.

The third step is to adjust the contrast and brightness of the canvas so that the portion with the copper film and the portion without the copper film are strongly contrasted, then turn the secondary image to black and white to check whether the line is clear. 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. If you find any problems with the graphics, you can use PHOTOSHOP to fix and correct them.

The fourth step is to convert the two BMP files into PROTEL format files, and transfer them into two layers in PROTEL. If the two layers of PAD and VIA are basically coincident, it indicates that the first few steps are very good. If there is a deviation, repeat the third step. Therefore, pcb copy board is a very patient work, because a small problem will affect the quality and the degree of matching after copying.

In the fifth step, convert the BMP of the TOP layer to TOP.PCB. Note that the layer to be converted to the SILK layer is the yellow layer. Then you trace the line in the TOP layer and place the device according to the drawing in the second step. Remove the SILK layer after painting. Repeat until you have drawn all the layers.

In the sixth step, TOP.PCB and BOT.PCB are transferred in PROTEL, and it is OK to combine them into one figure.


In the seventh step, the TOP LAYER and BOTTOM LAYER are printed on the transparencies (1:1 ratio) by laser printer, and the film is placed on the PCB. If there is any mistake, if you are correct, you are done. .

A copy board like the original one was born, but it was only half done. Also test, test the electronic technology 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 multi-layer board, carefully polish it to the inner layer, and repeat the steps of the third to fifth steps. Of course, the naming of the graphics is different. According to the number of layers, the general double-panel copy board should be It is much simpler than a multi-layer board, and a multi-layer copy board is prone to misalignment, so the multi-layer board is particularly careful and careful (internal vias and non-vias are prone to problems).

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