Check PCB incoming materials. Whether the welding plate is oxidized, the printed board is deformed, the printed board is scratched; Inspection method: Visual inspection according to the inspection specification.
Attention should be paid to the wiring of signal lines under magnetic beads, between pads and those that may come into contact with magnetic beads. Some magnetic beads conduct electricity quite well and may produce unexpected conductive paths.
All kinds of reliability design in digital circuit application is related to the reliability requirements of the circuit in practical application and product engineering requirements, so it is not possible to add various kinds of high-cost "guarantee...
Remember to connect the RF circuit board and the digital application circuit board with the GND cable of the twisted-pair cable. The length of the cable should be as short as possible. The wiring that powers the RF circuit board must also be twisted-GND (
To prevent PCB over wave soldering tin through the through hole through the component surface resulting in short circuit; In particular, when we put the hole on the BGA pad, we must first do the plug hole, and then gold-plated treatment, to facilitate the
For some parts that cannot be inspected by appearance, as well as the through hole inside the PCB and other internal defects, X-ray fluoroscopy system has to be used for inspection.
Multiple flexible PCB stiffeners are used to provide higher stiffness and strength for flexible PCBS. They are usually placed in key locations on the circuit board and can be made of different materials, including metal and plastic.
HDI pcb boards support more electrical connections per unit area than traditional single-layer boards. This is mainly due to the use of multiple layers as interconnects between layers in both laminated and blind holes.
HDI PCBS are commonly used in avionics, military and aerospace applications where reliability is critical. A typical aircraft requires hundreds of microcircuits, sensors and other electronic components that need to be connected with hundreds of wires.
Effectively control the cost of PCBA OEM materials: first, active planning and management, second, strengthen monitoring, third, comprehensive application
Screen printing: This is an unnecessary component, the main function is to mark the name and position of various parts on the circuit board, easy to maintain and identify after assembly.
Output PCB layout picture information in the form of Gerber file. This format is the standard for PCB files, which are the form of CNC files used by photo plotters. In addition to the Gerber file, borehole information is generated as well as screen printi
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