论文部分内容阅读
故障现象:开机后,整机不能启动,机内发出“吱吱”叫声,待命指示灯也不亮。分析与检修:该机发出“吱吱”声,一般怀疑行电路有问题。测+B只有80V,断开行负载,接入100W灯泡作假负载后,+B升为+135V,几秒钟后+B下降到+21V(因该机采用I~2C总线控制,部分集成块不工作时,电源启动几秒钟后整机将进入保护状态,待命指示灯亮,故+B输出只有21V,这一点请维修者注意),因
Symptoms: boot, the machine can not start, the machine issued a “creak” sound, standby indicator light is not bright. Analysis and Maintenance: The machine issued a “creak” sound, generally suspected line circuit problems. Measured + B only 80V, disconnect the line load, access to 100W bulb for false load, + B rose to +135 V, + B after a few seconds down to +21 V (because the machine uses I ~ 2C bus control, some integrated block When not working, the power will start a few seconds after the machine will enter the protection state, standby indicator light, so + B output only 21V, please pay attention to the maintenance of this point), due to