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(6)+200V欠压保护:+200V直流电压由行输出级产生,它为三路末级宽带视频放大器N501~N503供电。如果+200V电压大幅下降,则会使三极投影管阴极发射的电子流迅速增大而加速CRT管早期老化,因此设置由V405、V406、VD409等相关元件组成的+200V欠压保护电路,以保护三只投影管,延长其使
(6) +200 V Undervoltage protection: The +200 V DC voltage is generated by the line output stage, which supplies power for the three last-stage broadband video amplifiers N501 to N503. If the voltage of +200 V drops sharply, the electron current emitted by the cathode of the three-pole projection tube rapidly increases to accelerate the early aging of the CRT. Therefore, a + 200V undervoltage protection circuit composed of V405, V406, VD409 and other related components is provided Protect three projection tubes to prolong their use