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故障现象一:开机后,字车能复位,面板灯正常,但伴有报警声和强烈声响.分析与维修:从字车能复位、面板灯正常看,字车驱动电路似乎正常,但由于有报警声和强烈声响,怀疑驱动电路部分有软击穿元件.拆开打印机,仔细检查控制板,发现字车驱动管TR5—TR8中的TR7已明显损坏,但量TR7的电阻值仍正常,说明刚开机时,该元件能勉强工作,但随温度上升后,该管失效造成上述故障,TR7为2SD1725,参数为120Vcbo,4A,20W,用参数为200Vcbo,4A,40W的2SC2233替换,故障排除.
Failure phenomenon: boot, the car can be reset, the panel light is normal, but accompanied by the alarm sound and a strong sound Analysis and Maintenance: From the word car can reset the panel light to see the word car drive circuit seems normal, but because of Alarm sound and strong sound, suspected driver circuit part has a soft breakdown components.Start the printer, carefully check the control panel and found TR7 TR-TR8 word train driver has been significantly damaged, but the resistance value of TR7 is still normal, that Just started up, the components can barely work, but with the temperature rise, the tube failure caused the failure, TR7 to 2SD1725, parameters 120Vcbo, 4A, 20W, with parameters 200Vcbo, 4A, 40W 2SC2233 replacement, troubleshooting.