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Analysis of the reasons for PCB open circuit

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Published by: Keyou September 30,2019
Tags:
  • PCB
  •     First, the open circuit caused by the exposed substrate
         1. The PCB CCL has scratches before entering the warehouse;
         2. The PCB CCL is scratched during the opening process;
         3. The PCB CCL is scratched by the drill nozzle during drilling;
         4. The PCB CCL is scratched during the transfer process;
         5. When the board is stacked after sinking copper, the surface copper foil is bumped due to improper operation;
         6. The surface copper foil is scratched when the production board passes the horizontal machine;

     

                           Analysis of the reasons for PCB open circuit

     

        Second, there is no copper open circuit in the PCB hole
         1. There is no copper in the sinking copper hole;
         2. There is oil in the hole to cause no copper in the PCB hole;
         3. Excessive micro-etching causes no copper in the PCB holes;
         4, poor plating caused no copper in the PCB hole;
         5. The hole in the drill hole or the dust blocking hole causes no copper in the PCB hole;

     

       Third, the fixed position open
         1. The scratch on the alignment film line creates an open circuit;
         2. There is a trachoma on the parallel line to open the road;

     

       Fourth, anti-plating open road
         1. Open circuit caused by dry film breakage on the line during development;
         2. The ink is attached to the surface of the line to cause an open circuit;

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