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PCB Board Open Circuit Reasons And Improve The Method
Jul 01, 2017

  PCB board open circuit reasons and improve the method

  PCB board line open, short circuit is the PCB board manufacturers almost every day encountered problems, has been plagued by the production, quality management personnel, which caused the lack of quantity due to shipments and feed, delivery delays, customer complaints is the industry People are more difficult to solve the problem. I have been working in the PCB manufacturing industry for more than 20 years, mainly engaged in production management, quality management, process management and cost control and other aspects of the work. For the PCB board open and short circuit problems to improve the accumulation of some experience, is to form a text for the summary, for the PCB manufacturers to discuss the discussion, and look forward to the management of production, quality counterparts can be used as a reference.

  We will first cause the PCB board open the main reasons summarized as the following aspects:

  The reasons for the analysis and improvement of the above causes are listed below:

  First, open the substrate caused by open:

  1, CCL into the library before there is a scratch phenomenon;

  2, CCL in the open process was scratched;

  3, CCL drill hole was drilled when drilling;

  4, CCL in the transit process was scratched;

  5, after the copper plate stacking plate due to improper operation caused by surface copper foil was bumped;

  6, the production board in the level of the surface when the copper foil was scratched.

  Improve methods:

  1, CCL IQC must be in the library before the sampling, check whether there is a scratch surface of the substrate phenomenon, if the timely contact with the supplier, according to the actual situation, to make appropriate treatment.

  2, CCL in the process of opening the material was scratched, the main reason is that there are hard tools on the table there are hard objects exist, when the CCL and mining materials caused by copper alloy scraping the formation of exposed substrate material phenomenon, so open Before the material must be carefully cleaned table to ensure that the table smooth without hard objects exist.

  3, CCL drill hole was drilled when drilling, the main reason is the spindle pinch was worn, or folder within the debris did not clean clean, PCB board proofing grasping the drill when the grasping is not strong, drill Tsui not up to The top of the driller is slightly longer than the length of the drill string, and the height of the drilling hole is not enough. When the machine moves, the drill tip scratches the copper foil to form the exposed substrate.

  A, can be recorded by grasping the number of times or according to the degree of wear of the mouth, the replacement of the mouth;

  B, according to the operating procedures regularly clean the mouth Tsui, to ensure that there is no debris in the mouth.

  4, the plate in the transit process was scratched:

  A, handling personnel handling a one-time too much of the board, the weight is too large, the board is not lifted in the handling, but the opportunity to drag, resulting in plate angle and plate friction and scratch the board;

  B, put down the board because there is no put neat, in order to re-organize and forced to push the board, resulting in friction between the plate and plate scratch plate.

  5, Shen copper, the whole plate after plating plate due to improper operation was scratched:

  After the copper plate, the whole board after plating plate, because the board stacked together, a certain number, the weight is not small, and then down, the corner down and add a gravity acceleration, the formation of a strong impact Impact on the board, causing the board to scratch the substrate.

  6, the production board in the horizontal machine was scratched:

  A, grinding machine baffle sometimes contact with the surface of the board, the edge of the baffle is generally uneven and favorable objects raised, the board when the board was scratched;

  B, stainless steel drive shaft, due to damage into a sharp object, when the plate scratch the copper surface and exposed substrate.