The content of PCB incoming material inspection includes PCB size and appearance inspection, PCB warping and distortion detection, PCB weldability test, PCB solder resistance film integrity test, PCB internal defect detection.
Although PCB can be called a high-tech product in the electronics industry, but now the development of PCB is not only challenged by its own cost-effectiveness problems, more is from the challenge of energy conservation and environmental protection.
SMT manufacturing units are fully automatic, high precision and high speed. As the degree of automation increases, PCB design must meet the SMT equipment requirements.
The PCB processing process from the inner line pattern transfer of PCB substrate to the outer line pattern transfer by pressing several times will cause different growth and contraction of the warp and weft of the jointed board.
Common ways to prevent PCB copying board: 1, grinding, 2, sealing glue, 3, use special encryption chip, 4, the use of uncracking chip, 5, use MASK IC, 6, the use of nude, 7, in the current of the signal line series more than 60 ohms of resistance, 8, use
Protection measures of multilayer PCB edge radiation: The three elements of EMC problems are: electromagnetic interference source, coupling path, sensitive equipment
When designing the PCB, please note the following points: The shape of a and Mark point is symmetrical up and down or symmetrical left and right, and the size of b and A is 2.0mm. c, from the outer edge of Mark point 2.0mm, there should be no shape and co
The reasons for white spots in PCBA processing are as follows: 1. The circuit board is under inappropriate thermal stress; 2. 2. Due to the influence of mechanical force, part of the resin is separated from the glass fiber, forming white spots; 3. Some PC
Precautions for the use of moisture sensitive devices in PCBA processing:1. Ovens used for baking are required to be ventilated and able to operate under the condition of humidity less than 5%. 2. SMT components shipped in high-temperature carriers can be
Four suggestions for PCB design: 1, about positioning hole, 2, about MARK point, 3, about 5mm edge, 4, do not directly on the pad over the hole,
Although PCB automators have been around as long as engineers have known about CAD, engineers involved in designing dense boards have almost completely ignored the implementation of automated technology.
PCB manufacturing process involves circuit board manufacturing, component procurement and inspection, patch processing, plug-in processing, program firing, testing, aging and a series of processes.
