In the process of PCB processing, it is inevitable that there will be defective products, which may be caused by machine errors or human factors. For example, sometimes there will be an abnormal condition called hole breaking state, the cause of which shall be analyzed on a case-by-case basis. If the state of hole breaking [...]
When troubleshooting nonfunctional or nonperforming circuits, engineers can often run simulations or other analysis tools to consider circuits from a schematic level. If these methods don't solve the problem, even the best engineers can get stuck, frustrated, or confused. I've been through this before. To avoid going down similar dead ends, here's a simple but [...]
A, red gum Red gum is a kind of polyene compounds, heated likely to occur after solidification, when temperature is 150 ℃, freezing point has the paste body becomes solid red glue, use this feature, you can use a little glue or printed to fixed patch components, circuit board components using patch red plastic can [...]
In the process of PCB production, the following production equipment is required: 1, engineering production --- light painting machine, film exposure machine 2. Material opening -- -- material opening machine, oven for baking plate 3, lamination -- brown production line, laminating machine, grinding machine 4, drilling -- -- CNC drilling machine 5, grinding board -- [...]
1.1 basic terms According to the definitions of IEC 60326 and GB2036, the meanings of printed circuit are as follows: On the insulating substrate, printed components or printed circuits formed according to the predetermined design and the conductive graphics combining the two are called printed circuits. A conductive figure formed on an insulating substrate and [...]
1. Copper foil adhesion refers to the adhesion force of printed conductor and welding plate on the substrate. The adhesion force is small, so printed conductor and welding plate are easy to be peeled off from the substrate. Circuit board factory check the copper foil adhesive tape, available to test for a transparent tape to [...]
In order to suppress noise ability, earthing and power of graphics should be parallel to the direction of data flow. Multilayer PCB may take several as shielding layer, power supply layer and ground layer can be regarded as shielding layer, note that the general ground inner or outer layer and the power supply design. Digital [...]
As the industrial transfer and upgrading, the implementation of the new labor contract law, the economic structure changes bring the rising cost of living in cities, and after 80, 90 staff and liquidity management difficulty, PCB manufacturers are experiencing more and more serious labor shortages and the challenge of rising labor costs, and then bring [...]
Part of the customers' miscalculation this type hole without copper as follows: 1, tin light deep plating (go) and poor ability of call tin bad; 2, abnormal PTH, hole didn't sink copper; 3, copper plated deep plating ability is poor. In the actual production, gradually thin hole without copper. Investigate its reason, nothing more is [...]
Basic flow science at first, this post is dedicated for profes sional simple study, single OUT, blind hole buried after have time continues: cutting - the inner line - lining etching - AOI - pressing - drilling - Kong Hua a copper - outer line - secondary copper outer etching - anti - words - [...]