1. Record PCB related details

　　Get a PCB, first record the models, parameters, and positions of all components on the paper, especially the direction of diodes, triodes, and the direction of IC notch. It is best to take two pictures of the component locations with a digital camera. Many pcb circuit boards are getting more and more advanced, and some of the diodes and triodes above are not visible at all.

　　2. Scanned image

　　Remove all components and remove the tin from the PAD holes. Clean the PCB with alcohol, and then put it into the scanner. When the scanner scans, you need to slightly increase the scanned pixels to get a clearer image.

　　Then lightly polish the top and bottom layers with water gauze paper until the copper film is shiny, 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 available.

　　3. Adjust the corrected image

　　Adjust the contrast and brightness of the canvas to make the part with copper film and the part without copper film have a strong contrast, then turn the secondary image to black and white, check whether the lines are clear, if not, repeat this step. If it is clear, save the picture as TOP BMP and BOT BMP files in black and white BMP format. If there is any problem with the picture, you can also use PHOTOSHOP to repair and correct it.

　　4. Check the position coincidence of PAD and VIA

　　Convert the two BMP format files to PROTEL format files respectively, and transfer two layers in PROTEL. For example, the positions of PAD and VIA after the two layers are basically the same, indicating that the first few steps are well done. If there is any deviation, then Repeat step three. Therefore, PCB copying is a work that requires great patience, because a little problem will affect the quality and the matching degree after copying.

　　5. Drawing layers

　　Convert the BMP of the TOP layer to the TOP PCB, pay attention to convert it 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. After painting, delete the SILK layer. Repeat until all layers are drawn.

　　6. Combined picture of TOP PCB and BOT PCB

　　Transfer the TOP PCB and BOT PCB in PROTEL and combine them into one picture.

　　7. Laser printing TOP LAYER, BOTTOM LAYER

　　Use a laser printer to print the TOP LAYER and BOTTOM LAYER on the 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.

　　8. Test

　　Test whether the electronic performance of the copy board is the same as that of the original board. If so then it's really done.

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