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图像中频(VIF)检波线圈和自动频率微调(AFT)移相线圈以及伴音中频(SIF)鉴频线圈是彩色电视机中的关键元件之一,习惯上通称它们为“中周”。当彩电长时间使用后,因潮气或煤气致使“中周”内附的瓷管状电容腐蚀氧化而造成漏电,容量下降。一旦相应的“中周”谐振频率偏离标准值,形成谐振回路失谐时,将会直接影响自动搜索时存储台位和图像以及伴音的
Image-to-VIF coils and AFT phase-shifted coils and SIF coils are one of the key components of color televisions and are commonly referred to as the “mid-week.” When the color TV for a long time after use, due to moisture or gas caused by the “week” included in the corrosion of ceramic capacitors caused by corrosion and leakage, capacity decline. Once the corresponding “mid-week” resonant frequency deviates from the standard value, forming the resonance loop detuning will directly affect the automatic search when storing stations and images and sound