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排查空调电路结构的方法!

来源:http://www.jnslshwx.com 日期:2019-04-18 发布人:admin
  熟悉电路结构,先分清控制板的内外电路,外部检测、外部控制等,分清故障产生是内因还是外因——确定是电路控制故障还是制冷系统故障——判断室内还是室外故障。
  Familiar with the circuit structure, first distinguish the internal and external circuit of the control board, external detection, external control and so on, distinguish whether the fault is internal or external cause - to determine whether it is a circuit control fault or a refrigeration system fault - to judge whether indoor or outdoor fault.
  1、分析电路。分析出和电路板相连的每根线或插头的作用,找出用于检测空调性能的外接线路,检查这些线路是否存在明显的开、短路故障。
  1. Analysis circuit. The function of each wire or plug connected to the circuit board is analyzed, and the external circuits used to test the performance of air conditioning are found out. The open and short circuit faults of these circuits are checked.
  2、判断板内外故障。电路板外围线路基本正常,可大致判断电路板存在故障。可通过电压检测和功能调试进行故障检查。
  2. Judge the internal and external faults of the board. The peripheral circuit of the circuit board is basically normal, so it can be roughly judged that there are faults in the circuit board. The fault can be checked by voltage detection and functional debugging.
  象能够遥控接收有蜂鸣,内风机能正常运转,制热操作四通阀有工作声等可基本判断控制板正常。
  The control panel can be judged to be normal by remote control receiving buzzing, normal operation of internal fan and working sound of four-way valve in heating operation.
  通电遥控不接收,蜂鸣异常,不操作自身工作,工作程序紊乱等可判断电路板自身有故障,或+12V及+5V电源异常,公共电源回路有断路等。
  Electricity remote control does not receive, buzzing abnormal, do not operate their own work, work procedures disorder, etc. can judge the circuit board itself is faulty, or + 12V and + 5V power supply abnormal, public power circuit has circuit breaks, etc.
  不知代码含义本着先简后繁,先易后难,先外后里的常规检查手段,进行各关键点的压力,电压,电流,阻值的测量,以达到快速排除故障的目的。
  I don't know the meaning of the code, in order to quickly remove the fault, I do the measurement of the pressure, voltage, current and resistance of the key points by the conventional inspection methods, which are simple, easy and difficult.
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  3、电路板的常规检查:
  3. Routine inspection of circuit boards:
  保险丝,压敏电阻是否烧坏。
  Fuse, whether the varistor burns out.
  +12V,+5V不正常时的滤波电容,变压器线圈的通断、负载和空载电压,CPU的电源,驱动集成电路和三极管电压。
  + 12V, +5V filter capacitor when abnormal, on-off, load and no-load voltage of transformer coil, power supply of CPU, driving integrated circuit and triode voltage.
  复位电压,CPU端子是否虚焊,脱焊,4M晶振代换。
  Reset voltage, whether the CPU terminal is virtual welding, de-welding, 4M crystal oscillator replacement.
  遥控接收头、显示电路测量及代换。
  Remote control receiver, display circuit measurement and substitution.
  各继电器尤其是功率继电器端子是否脱焊,各插头是否接触不良。
  Whether the terminals of relays, especially power relays, are off-welded or not, and whether the plugs are in bad contact.
  CPU输入信号、输出信号的电压,驱动过程测量。
  CPU input signal, output signal voltage, drive process measurement.
  电路板正反面上是否有水浸,腐蚀,脏物,检流线圈的导线是否穿过骨架,各线头有无松动、脱落。
  Whether there is water immersion, corrosion, dirt on the front and back of the circuit board, whether the conductor of the galvanometer coil passes through the skeleton, whether the ends of the wires are loose or fall off.

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