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维修彩电时,常常会用万用表的电压档测量各点电压是否正常的方法来寻找故障点。但由于万用表内阻不同,测得的电压值会有一定的误差,有时甚至会引起行振荡电路停振,造成判断失误。若改用数字万用表的频率档测量行频的办法,往往能比较快捷准确地找出行扫描电路的故障点。现以DT9208型3-1/2位数字万用表的20kHz频率档为例,介绍两例行扫描电路维修经验。 1、一台熊猫53cm遥控彩电,有伴音,但光栅时有时无。初步判断为接触不良,对相关元件补焊,故障仍未排除。在无光栅时用数字万用表频率档对行频信号进行监测。相关集成块为
Maintenance of color TV, often with a voltage meter multimeter to measure the voltage at each point is normal way to find the point of failure. However, due to different multimeter resistance, the measured voltage value will have some error, and sometimes even cause line oscillation circuit stops vibration, resulting in misjudgment. If you switch to digital multimeter frequency file frequency line approach, often more quickly and accurately find the line scan circuit fault point. Now to DT9208 3-1 / 2 digital multimeter 20kHz frequency file as an example, introduce two routine scanning circuit repair experience. 1, a panda 53cm remote color TV, with sound, but sometimes no grating. The initial judge as bad, make repairs to the relevant components, the fault has not been ruled out. In the absence of grating with digital multimeter frequency file to monitor the line frequency signal. Related blocks are