Description

<style>.e_editor{font:14px/24px Roboto,Helvetica,Tahoma,Arial,'Microsoft YaHei','b8bf53';}.e_editor div,e_editor p,e_editor td,e_editor th,e_editor li{font-weight:inherit;font-size:inherit;font-style:inherit;font-family:inherit;}.e_editor ul{margin:-10px 0 20px;}.e_editor li{padding:5px 0;}.e_table{width:96%;border-collapse:collapse;empty-cells:show;}.e_table th,.e_table td{padding:5px;border:2px solid #eee;}.e_img{padding:10px 0;text-align:center;}.e_p{line-height:20px;padding:0 0 20px;text-indent:0em;}</style> <div class="e_editor"> <div class="e_p"> There are several factors that cause circuit board solding defects: </div> <div class="e_p"> First, the solderability of the hole. </div> <div class="e_p"> If circuit board hole solderability is not good, it will affect the circuit components of the parameters, resulting in conduction instability, causing the entire circuit function failure. </div> <div class="e_img"> <img src="https://file.allpcb.com/bbs/17/05/08/140613642.gif" /> </div> <div class="e_p"> Second, warping </div> <div class="e_p"> Circuit boards and components in the soldering process may produce warping, causing short circuit and other defects. Warping is often due to the imbalance of the upper and lower parts of the circuit board or due to the weight of the circuit board itself. </div> <div class="e_img"> <img src="https://file.allpcb.com/bbs/17/05/08/140630616.png" width="380" height="143" /> </div> <div class="e_p"> Third, PCB design </div> <div class="e_p"> If the board size is too large, the printed line length and impedance will increase, anti-noise ability will decrease and cost will increase;if board is too small, the welding is not easy to control and prone to adjacent lines interfere with each other, such as circuit board Electromagnetic interference and so on. How to optimize the PCB file? </div> <div class="e_p"> 1. shorten the connection between high-frequency components, reduce EMI interference. </div> <div class="e_p"> 2. heavy (such as more than 20G) components, should to be fixed bracket and then welding. </div> <div class="e_p"> 3. thermal components should be away from the heat source. </div> <div class="e_p"> 4. the arrangement of components as parallel as possible, making it easy to weld. </div> </div>