PCB Technical - Pcb processing

1. Get a piece of PCB, first record the model, parameters, and position of all vital parts on the paper, especially the direction of the diode, the direction of the three-machine tube, and the direction of the IC gap. .It is easy to use a digital camera to take two photos of the location of vital parts.PCB copy board.

2. Remove all components and remove the tin in the PAD hole. Clean the PCB with alcohol, then put it in the scanner, start POHTOSHOP, scan the silk screen surface in color, and print out the spare PCB copy board.

3. Will the water gauze paper be TOP? LAYER? And BOTTOM? Lightly polish the two layers of the LAYER until the copper film is shiny, put it in the scanner, start PHOTOSHOP, and scan the two layers separately in color. Note that the PCBmust be placed horizontally and straight in the scanner, otherwise the scanned image cannot be used.

4. 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 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.

5. Convert the two BMP format files to PROTEL format files, and transfer to two layers in PROTEL. For example, the positions of PAD and VIA that have passed through two layers basically coincide, indicating that the previous steps have been done well. If there is a deviation, Then repeat the third step.

6. Put TOP. BMP is converted 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.

7. Put BOT. BMP is converted to BOT. PCB, pay attention to the conversion to the SILK layer, which is the yellow layer, and then you can trace on the BOT layer. After drawing, delete the SILK layer and the PCB copy board.

8. Put TOP in PROTEL. PCB and BOT. Import the PCB and combine it into one picture and it's OK.