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例1 机型:先锋PD—T503型故障现象:机器开机一段时间后,发生不能加载故障。分析与检修:打开机壳,根据该机加载电路原理得知,当系统控制集成电路输出加载或卸载信号时,加载电机受运算放大器的作用,作正、反转动,通过传动机构使机器加载或卸载。首先接通该机加载电路,用万用表电压档测电动机两端的加载电压,看是否有10V,如果有10V电压则是加载电机的问题;如果没有10V电压,则是负载电路中集成块IC17以前电路或电源电路发生了故障,可继续检查IC17以前电路,找到故障部位。经检查电机两端电压为10V,但电机不转,进而
Example 1 Model: Pioneer PD-T503-type Symptom: After the machine boot a period of time, can not load failure occurs. Analysis and Overhaul: Open the case, according to the machine loading circuit theory that when the system control integrated circuit output load or unload signal, the loading motor by the role of operational amplifier, for positive and negative rotation, the machine through the transmission mechanism to load Or uninstall. First turn on the loading circuit of the machine, with a multimeter voltage file to measure the load voltage across the motor to see if there is 10V, if there is 10V voltage is the problem of loading the motor; if there is no 10V voltage, is the load circuit manifold IC17 circuit Or the power circuit fails, you can continue to check the circuit before the IC17 to find the fault site. After checking the voltage across the motor 10V, but the motor does not turn, and then