PCB Blog - PCB board screen printing specifications and requirements

1. All components, mounting holes, and positioning holes have corresponding silk screen labels. In order to facilitate the installation of the finished PCB board, all components, mounting holes, and positioning holes have corresponding silk screen labels. The mounting holes on the PCB board are screen printed with H1. , H2...Hn for identification.

2. The silk screen characters follow the principle of left to right and bottom to top. The silk screen characters should follow the principle of left to right and bottom to top as much as possible. For devices with polarities such as electrolytic capacitors and diodes, try to keep them in each functional unit as much as possible. the same direction.

3. There is no silk screen on the device pad and the tin track that needs to be tinned, and the device number should not be blocked by the device after installation. (The density is high, except for those that do not need silk screen printing on the PCB board) In order to ensure the reliability of the soldering of the device, it is required that there is no silk screen on the device pad; in order to ensure the continuity of the tin-lined tin track, it is required that there is no silk-screen on the tin-lined tin track. ; In order to facilitate device insertion and maintenance, the device number should not be blocked by the device after installation; the silk screen should not be pressed on the via hole and pad, so as to avoid the loss of part of the silk screen when the resistance soldering window is opened, which will affect the training. The screen spacing is greater than 5mil.

4. The polarity of polar components is clearly indicated on the silk screen, and the polarity direction mark is easy to identify.

5. The direction of the directional connector is clearly indicated on the silk screen.

6. There should be a barcode position mark on the PCB board. When the space of the PCB board allows, there should be a 42*6 barcode screen printing frame on the PCB board, and the position of the barcode should be considered for easy scanning.
7. The screen printing position of the board information such as PCB board name, date, version number, etc. should be clear. The PCB board file should have the board name, date, version number and other information screen printing of the finished board, and the location is clear and eye-catching.
8. There should be complete relevant information and anti-static logo of the manufacturer on the PCB board.
9. The number of light-painting files on the PCB board is correct, each layer should have the correct output, and there should be a complete number of layers output.
10. The identifier of the device on the PCB must be consistent with the identifier in the BOM list.

Design Printout Considerations
1. The layers that need to be output are:
(1) The wiring layer includes the top layer/bottom layer/middle wiring layer/power layer including the VCC layer and the GND layer;
(2) The silk screen layer includes the top silk screen/bottom silk screen/
(3) The solder mask layer includes the top solder mask and the bottom solder mask
(4) In addition, generate the drilling file NCDrill

2. If the power layer is set to Split/Mixed, then select Routing in the Document item of the AddDocument window and use PourManager's Plane Connect to copper-clad the PCB board before each output of the light drawing file; if it is set to CAMPlane, select Plane When setting the Layer item, add Layer25 and select Pads and Vias in the Layer25 layer.
3. Press Device Setup in the Device Setup window to change the value of Aperture to 199;
4. Select Board Outline when setting the Layer of each layer;
5. Do not select Part Type when setting the Layer of the silkscreen layer, select the Outline Text Line of the top and bottom layers and the silkscreen layer;
6. When setting the Layer of the solder mask layer, select the via hole to indicate that no solder mask is added to the via hole, and not to select the via hole to indicate that the home solder mask is determined according to the specific situation;
7. Use the default settings of the PowerPCB board when generating the drilling file and do not make any changes;
8. All light-drawing files are opened with CAM350 after output and printed by designers and reviewers to check according to the "PCB Board Checklist".

Safety marking requirements
1)The safety regulations of the fuse are complete. Whether there are 6 complete signs near the fuse, including the fuse serial number, fusing characteristics, rated current value, explosion-proof characteristics, rated voltage value, and English warning signs. If there is no space to arrange English warning signs on the PCB board, the English warning signs can be placed in the product instruction manual for instructions.
2)The dangerous voltage area on the PCB board is marked with a high voltage warning sign. The dangerous voltage area part of the PCB board should be separated from the safe voltage area by a 40mil wide dotted line.
3)The original and auxiliary side isolation belts are clearly marked. The original and auxiliary side isolation belts of the PCB board are clear, and there is a dotted line in the middle.
4. The safety label of the PCB board should be clear and complete.