How do PCB printed circuit board manufacturers deal with PCB open circuit problems?

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How do PCB printed circuit board manufacturers deal with PCB open circuit problems? [Copy link]

How do PCB printed circuit board manufacturers deal with PCB open circuit problems?

The open circuit and short circuit of PCB circuit boards are almost every day problems encountered by PCB printed circuit board manufacturers, and these problems have been troubling production and quality management personnel. We have accumulated some experience in improving the open circuit and short circuit of printed circuit boards. Now we have written a summary of the discussion on PCB manufacturing. I hope it will be a reference for colleagues engaged in production and quality management.


First of all, we summarize the main reasons for the open circuit of PCB circuit boards


as follows: The causes and improvement methods of the above phenomenon are as follows:


Exposure substrate:


1. There are scratches before the copper clad laminate is stored.


2. The copper clad board is scratched during the punching process.


3. The copper composite board is scratched by the drill bit during the drilling process.


4. The copper clad laminate is scratched during transportation. 5.


When the copper foil is stacked after sinking, the surface is damaged due to improper operation.


6. The copper foil on the surface of the production board is scratched when passing through the horizontal machine.


PCB circuit board circuit open circuit improvement method:


1. IQC must conduct a spot check before entering the warehouse to check whether there are scratches on the surface of the copper clad board. If so, contact the supplier in time and deal with it according to the actual situation.


2. The copper clad board is scratched during tapping. The main reason is that there are hard and sharp objects on the surface of the tapping machine table. When tapping, the copper clad board and sharp objects are scratched to form an exposed substrate. Therefore, before tapping, the surface of the table must be carefully cleaned to ensure that the surface of the table is not a hard and sharp object.


3. The copper clad board is scratched by the drill bit when drilling. The main reason is that the spindle clamp is worn, or there are some debris in the clamp that is not clean, the PCB sample preparation cannot firmly clamp the drill bit, the drill bit cannot reach the top, it is less than the length of the drill bit group, and the height increased during drilling is not enough. When the machine tool moves, the drill tip wipes the copper foil to form an exposed substrate. The fixture can be replaced by the number of times the fixture is recorded or the degree of wear of the fixture. Clean the fixture regularly according to the operating procedures to ensure that there are no impurities in the fixture.


4. The metal plate is scratched during transportation: When moving, the transmission lifts too many plates at a time, and the weight is too large. When moving, the board is not lifted, but dragged with the trend, causing friction between the corners and the board surface, and scratching the surface of the board. When the board is put down, the surface of the board is scratched due to the friction between the boards.


5. Scratches caused by improper operation of sinking or stacking copper plates after electroplating: When the boards are stacked together after sinking and electroplating, the weight is not small. When laying the board, the angle of the board is downward, there is gravity acceleration, which forms a strong impact force on the surface of the board, causing scratches on the surface of the board and exposing the substrate.


6. The production of soft and hard combined boards will be scratched when passing through the horizontal machine. The baffle of the grinder sometimes hits the surface of the baffle. The edge of the baffle is usually uneven, and sharp objects are lifted. The surface of the baffle is scratched when passing through the plate. Stainless steel drive shaft. Due to the damage of sharp objects, the surface of the copper plate is scratched and exposed when passing through the plate.

吾妻思萌

Thin boards are prone to problems.

mypad123

I learned something! Thanks for sharing!

谢辉

Very good post, I'll learn from it, thank you very much for sharing!

秦天qintian0303

Will PCB printed circuit board manufacturers test for open circuits before shipping?

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Qintianqintian0303 posted on 2023-6-14 11:17 Will PCB printed circuit board manufacturers detect open circuits before shipping after production?

Each PCB will be tested before leaving the factory. If the quantity is small, flying probe test will be carried out, and if the quantity is large, test stand will be used.

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Azuma Simeng posted on 2023-6-13 08:04 Thin boards are prone to problems

Thin and small boards are prone to problems and require very high precision.

lkh747566933

Very good post, I'll learn from it, thank you very much for sharing!