Circuit board PCBA processing process can be roughly divided into: empty plate loading - printed solder paste - mounting devices - reflow welding -AOI testing - receiving plate - finished product inspection - parts after welding - circuit board open/short
Four proofing methods of aluminum substrate: one, photographic material proofing method, two, mechanical proofing method, three, electronic proofing method, four, computer aided proofing method
Common bad reasons for PCBA welding resistance film processing :1. Welding pad and through hole connection. 2. Solder resistance design between pad and pad, solder resistance graphic specifications should conform to the design of welding end distribution
The difference between them is that the core is thinner, the pp sheets of one or two layers and five or six layers are thinner, and there is a core board between the core board and the core board without copper foil on both sides, so generally this kind o
The function of PCB design discharge teeth: in surge testing or ESD testing, the two ends of the common-mode inductor will produce high voltage, there will be a flying arc, if the distance is close to the surrounding devices, it may cause damage to the su
The role of PCB process edge: process edge is the part added on both sides or four sides of PCB board, mainly to assist the patch plug-in welding plate
PCB board common bad reasons: 1, short circuit, 2, open circuit, 3, PCB board dark and granular contact, 4, PCB board solder joint into golden yellow, 5, environmental impact
How to route the key signals of PCB design: first, analog signal wiring requirements, second, high-speed signal wiring requirements, third, clock signal wiring requirements
SMT patch processing emphasizes fast and efficient production. General SMT patch workshops will carry out non-stop production. The shutdown and line change of machines will increase production costs and reduce profits.
Aluminum is a very attractive material with abundant resources, low cost, excellent thermal conductivity and strength. In addition, it is very environmentally friendly and can be used on most metal substrates or cores.
During SMT processing, plug holes are required, which have five main functions:1. Prevent short circuit caused by tin penetrating through the component surface from the passthrough hole during wave soldering of PCB; 2. Avoid flux residue in the pass hole.
Four characteristics of PCB gold sinking process: 1. Gold sinking plate bright color, good color, beautiful, enhance the appeal to customers. 2. The crystal structure formed by sinking gold is easier to weld and has better performance to ensure the qualit
Telegram
