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日立CMT2598彩电利用开关电源厚膜电路STR-6708内部的过压保护功能,设计了可控硅保护电路。当行、场扫描电路发生过流、过压故障时,可控硅被触发导通,通过光电耦合器传递保护信息,迫使厚膜电路STR-6708内部的过压保护电路动作,开关电源停止工作,输出电压降到0V,进入保护状态,该机因此常发生“三无”故障。而排除“三无”故障,必须从保护电路入手。
Hitachi CMT2598 color TV using thick-film switching power supply circuit STR-6708 internal over-voltage protection, the design of the SCR protection circuit. When the line, the field scanning circuit over-current, over-voltage fault, the SCR is triggered conduction through the photocoupler transmission protection information, forcing thick film circuit STR-6708 internal over-voltage protection circuit action, the switching power supply to stop working, Output voltage down to 0V, into the protection state, so the machine so often “three no ” fault. And rule out “three no ” breakdown, must start from the protection circuit.