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一台长虹C1942型彩电,在收看中出现无彩色(黑白图像正常)故障,调节色饱和度电位器不起作用。分析与检修:该机为松下M11机芯,本机主讲:“此机曾请别人修过,替换过解码块和CPU”。该机芯彩色解码电路由IC601(AN5620X)和IC301(BL5612)及外围元件组成。从故障现象来讲,主要由以下几方面原因引起:(1)高频、中频电路;(2)副载波振荡电路和恢复电路;(3)
A Changhong C1942-type TV, appear in the absence of color (black and white image normal) failure, adjust the color saturation potentiometer does not work. Analysis and Maintenance: This machine is Panasonic M11 movement, the machine speaker: “This machine has invited others to repair, replace the decoding block and CPU.” The movement color decoding circuit IC601 (AN5620X) and IC301 (BL5612) and peripheral components. From the fault phenomenon, mainly due to the following reasons: (1) high frequency, intermediate frequency circuit; (2) subcarrier oscillation circuit and recovery circuit; (3)