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一台三洋12-T280U1型(12英寸)全频道黑白电视机出现图像、光栅时有时无,像阻塞一样,故障出现无规律。经分析此现象似是电源部分有故障。测稳压电源12V输出,当故障出现时,12V电压没变化,说明故障不在电源部分。考虑到电源部分正常而无伴音无图像,可能与预视放级工作异常有关。于是,检测预视放管基极电压(见图1)正常时为5.6V。故障出现时,
A Sanyo 12-T280U1 (12 inches) all-channel black and white TV images appear, the grating sometimes no, like a blockage, the fault appears irregular. After analyzing this phenomenon seems to be part of the power failure. Measured power supply 12V output, when the fault occurs, 12V voltage did not change, indicating that the fault is not part of the power supply. Taking into account the power part of the normal and no sound without images, may be related to the work of the pre-release-class abnormalities. Therefore, the detection of pre-release tube base voltage (see Figure 1) is 5.6V when normal. When the fault occurs,