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1、一台熊猫3403A光栅亮度暗,行幅窄。 测电源11.5V正常,升压提升仅20V,正常为26V。触摸行管BU406十分烫手,怀疑行管饱和压降大,提升电压上不去引起发热,更换大金属管3DD15D,故障依旧。测行管b极负压较微弱。测行频控制MC13007(12)脚仅2.8V,正常应4.5V,检查外围5C1(100pF)严重漏电,换新后提升电压升至26V,光栅正常,故障排除。 2、一台飞跃19D1亮度偏低,对比度差,严重散焦。
1, a panda 3403A grating darkness, narrow line width. Measuring 11.5V power supply normal, boost only 20V, normal is 26V. Touch line tube BU406 is very hot, suspected tube saturation pressure drop, increase the voltage does not cause heat, replace the big metal tube 3DD15D, the fault still. Bank test tube b very weak negative pressure. Test line frequency control MC13007 (12) feet only 2.8V, normal should be 4.5V, check the external 5C1 (100pF) serious leakage, the new upgrade voltage rose to 26V, grating normal troubleshooting. 2, a leap 19D1 low brightness, poor contrast, serious defocus.