论文部分内容阅读
指示灯亮,说明副电源工作正常,故障出在主电源或扫描电路部分。首先,测量主电源各组输出是否正常;若无输出,则初步判断故障出在初级回路。测量振荡电路IC8004(MB3759)⑤、⑥脚电压是否正常(正常时⑤脚为1.5V、⑥脚为3.6V);若两脚电压均偏低,则说明IC8004不良或其外围电路有故障。可检测外围电路,若有元器件损坏应更换,若外围电路无异常,说明IC8004内部损坏。更换后,故障即可排除。
Indicator light, indicating that the secondary power supply is working properly, the fault is in the main power supply or scanning circuit part. First of all, the measurement of the main power output of each group is normal; if no output, the initial judgment of the fault in the primary circuit. Measuring oscillation circuit IC8004 (MB3759) ⑤, ⑥ pin voltage is normal (normal ⑤ pin 1.5V, ⑥ pin 3.6V); if both feet are low voltage, then the IC8004 bad or its peripheral circuit fault. Can detect peripheral circuits, if any component damage should be replaced, if no abnormal external circuits, that IC8004 internal damage. After replacement, the fault can be ruled out.