印刷电路板分正面和背面。一般元件安装在印刷电路板的背面,焊点在正面。在安装或拆卸元器件时,往往要多次翻转电路板,由此就产生了元件从左侧转到了右侧,或从上部转到了下部,电路走向相应也发生了变化。对于初学者,有时会转不过来弯,发生拆错元件、安错位置、或费了很长时间才找到要找的元件。 本人从实践中得出,避免少走弯路要从以下几方面人手。第一,要认真看清电路原理图,记好元器件编号。因为在同一电路中,每一个元器件的名称代号都是唯一的。还要记住要找的元器件是电阻、电容还是晶体管,熟悉这类元器件的外形。在记住代号的基础上,再从印刷电路上找出准确位置,看清各引脚的焊点及周 Printed circuit board points front and back. General components mounted on the back of the printed circuit board, solder joints in the front. When installing or removing components, often flip the circuit board several times, resulting in the components from the left to the right, or from the upper to the lower part of the circuit has also changed accordingly. For beginners, sometimes you can turn around, happen to disassemble the components, the wrong place, or take a long time to find the components you are looking for. I draw from practice, to avoid detours to go from the following aspects of manpower. First, we must carefully see the circuit diagram, remember the part number. Because in the same circuit, each component name code is unique. Also remember to find the components are resistors, capacitors or transistors, familiar with the shape of such components. Remember the code on the basis of the printed circuit to find out the exact location, see the pin solder joints and weeks