PCB News - The specific steps of PCB copy board:

In one step, get a piece of PCB board. First, record the model, parameters, and positions of all vital parts on the paper, especially the direction of the diode, the tertiary 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. The current PCB circuit boards are getting more and more advanced. Some of the diode transistors above are not noticed at all.

The second step is to remove all the multi-layer boards and copy the boards, and remove the tin in the PAD hole. Clean the PCB with alcohol and put it into the scanner. When the scanner scans, you need to raise the scanned pixels slightly to get a clearer image. Then lightly polish the top and bottom layers with water gauze until the copper film is shiny, put them in the scanner, start PHOTOSHOP, and scan the two layers in separately in color. Note that the PCB must be placed horizontally and vertically in the scanner, otherwise the scanned image cannot be used.

Three steps, adjust the contrast, brightness and darkness of the canvas, 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, 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. If you find any problems with the graphics, you can also use PHOTOSHOP to repair and correct them.

Four steps, convert two BMP format files into PROTEL format files, and transfer two layers in PROTEL. For example, the positions of PAD and VIA after two layers basically coincide, indicating that the previous steps are well done. If there is Deviations, repeat three steps. Therefore, PCB copying is a work that requires patience, because a small problem will affect the quality and the degree of matching after copying.

Five steps, convert the BMP of the TOP layer 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 two-step drawing. Delete the SILK layer after drawing. Keep repeating until all the layers are drawn.

Six steps, import TOP.PCB and BOT.PCB in PROTEL and combine them into one picture and it will be OK.

Seven steps, use a laser printer to print TOPLAYER and BOTTOMLAYER on transparent film (1:1 ratio), put the film on the PCB, and compare whether there are errors. If they are correct, you are done.

A copy board that is the same as the original board was born, but this is only half done. It is also necessary to test whether the electronic technical 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 multilayer board, you need to carefully polish to the inner layer, and repeat the three to five steps of copying the board at the same time. Of course, the naming of the graphics is also different. It depends on the number of layers. Generally, double-sided board copying is more than The laminate is much simpler, and the multi-layer copy board is prone to misalignment. Therefore, the multi-layer board copy board must be especially careful and careful (the internal vias and non-vias are prone to problems).