Scan a picture of the printed circuit board Note: since there may be small chip elements under the large components, you can scan them first, remove the large elements, and then scan again.
Remove the componentsR emove all components the tin from the pad hole on printed circuit board.We start to scan it. According to the PCB board’s precision to get a clearer image. Start Photoshop, scan the screen printing surface in color mode, save the file, and print it for future use;
Pay attention to the polarity and direction of components when removing the board.
Make BOM Refer to the circuit board picture in the first step, record the model, parameters, and positions of all components on paper, especially the direction of the diode, transistor, and IC gap, and finally make the BOM list;
Grinding plate Polish the two layers of the top and bottom layers with water gauze until the copper film is bright. Put it into the scanner, start Photoshop, and scan the two layers in color;
Adjust the contrast and shade What contrast the canvas to the part with copper film. Then turn the secondary image to black and white. Or check whether the lines are clear. If not, repeat this step. It clear, save the image as a black and white BMP file TOP. BMP and BOT.BMP. If there is a problem with the graphics, you can also use Photoshop to correct them.
Start the PCB reverse engineering software Protel Transfer the scanned PCB board images into the file menu, convert the two BMP format files into PROTEL format files, and transfer them to the two-tier in PROTEL. If the two PAD and VIA levels basically coincide, it indicates that the first few steps are perfect, and if there are deviations, repeat the fourth steps.
Convert the BMP of the top layer into TOP PCB Pay attention to convert to the silk layer, and then you line the top layer and place the device according to the drawing in step 2. Delete the silk layer after drawing.
Convert the BMP of the BOT layer into BOT PCB The same as above is converted to the silk layer, and then you can draw lines in the BOT layer. Delete the silk layer after drawing.
Compose it into a graph In Protel TOP.PCB and BOT.PCB Call-in.
Print double-sided PCB board Use a laser printer to print the top layer and bottom layer on the transparent film (1:1 ratio). Put the film on the printed circuit board and compare whether there is an error. If it is right, a simple double-sided board will be made!