开机电源尖叫,关机测行管C-E结短路,摘下测量行管正常,发现阻尼管D905BY228击穿,电感L1301变色短路,校枕管Q1305D880 C-E击穿.换完开机行幅窄,测电源正常125V,查电容C917 8200P无容量,开机正常 |
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