The copy board is also called the change board, which is the reverse technology research on the designed PCB board. With reference to a large amount of information, the process of copying boards is summarized as follows:
The first step is to get a PCB. First, record the model, parameters, and position of all the 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 positions at the digital camera with a digital camera. The current PCB board is getting higher and higher. The above diode triode is not noticed at all.
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 in 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 image 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 format files into PROTEL format files, and transfer them into two layers in PROTEL. For example, the positions of PAD and VIA over two layers are basically coincident, indicating that the first few steps are very good, if 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.
The fifth step is to convert the BMP of the TOP layer into 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. Repeatedly knowing to draw 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.
Step 7，Print the TOP LAYER and BOTTOM LAYER on the transparencies (1:1 ratio) with a laser printer, and place the film on the PCB. In the final step, it is necessary to thoroughly check it. If there are no problems, then ok.