Explain the storage and shelf life of PCB circuit boards
the temperature reproducibility can be obtained through multiple tests, so as to systematically evaluate the performance of the press.
the temperature reproducibility can be obtained through multiple tests, so as to systematically evaluate the performance of the press.
Electrical testing is a very important link in the PCB board manufacturing process, the purpose is to check whether the PCB board is open and short circuit problem, to ensure that the finished products in line with the customer's electrical performanc
For electronic equipment, a certain amount of heat will be generated during work, so that the internal temperature of the equipment will rise rapidly.
In this process, all surface areas and boreholes are plated with copper, some resistance is poured on the surface of the unwanted copper, and then etching resistance metal is plated.
In general, lack of adequate material control, solder paste deposition method and equipment are the main reasons for defects in reflow welding process.
It is necessary to have common dimensional planning criteria in the design process, otherwise most electronic components in the market cannot be achieved. Such wiring design rules are the design criteria of the PCBA board.
In the absence of any schematic condition to a relatively unfamiliar circuit board maintenance, although the hardware knowledge of deep people are full of confidence in maintenance, but if the method is not appropriate, the work is still twice the result.
Fault PCB completely consistent PCB board maintenance has a great reference value. Repairing several identical broken circuit boards at the same time is often more convenient and easier than repairing a single broken circuit board.
PCB circuit board fault detection methods: 1, determine the fault location, 2, detection equipment, 3, visual and physical detection, 4, special detection components, 5, on the circuit board for detection, 6, low voltage measurement
Because the printed circuit board has high reliability, high density, strong design, strong production and other unique advantages, a good quality electronic equipment, largely depends on its PCB quality.
Every smart appliance or non-smart appliance is controlled by a circuit board, and each circuit board will have its own life, that is, the expiration date.
At present, many circuit board surface treatment methods, the cost of electroplating nickel gold is relatively high compared with other surface treatment methods, in the case of gold prices are so high, has been less used, unless there are special uses.