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例1.故障现象:接收U段节目时,无规律地出现水平粗亮线,且伴有场失步现象,同时图像噪点增多,伴音噪声增大。 分析检修:初步判断为高频头U段电路出现异常。用万用表分别检测U段高放管7004的AGC和S极电压以及U段本
Example 1. Symptom: When receiving a U-segment program, there is a random appearance of coarse thick bright lines with the out-of-step phenomenon of the field, meanwhile, the image noise increases and the sound noise increases. Analysis and maintenance: a preliminary judge for the UHF U-section circuit abnormalities. Use the multimeter to test the AGC and S pole voltage of U segment high-rise tube 7004 and U segment