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例1:一台三元牌35SY—2F型黑白电视机,出现伴音音量极小故障。用螺丝刀碰触音量电位器中间点无反应,故确认故障部位在伴音低放。测低放5BG_1、5BG_3、5BG_4各极电压均正常。经询问用户得知,该机经他人修过,取回后即发观该故障。于是,查找新换的元件是否符合要求,结果发现新换的音量电位器阻值仅4.7kΩ。用一只100kΩ电位器更换,试机恢复正常。例2:机型同上,出现有伴音、无光栅故障。测行管c极电压为24V,电源电压为10V。调整6W_1,使电源电压达到12V,行管c极电压上升到28.5V,测显像管各
Example 1: A ternary brand 35SY-2F type black and white TV, sound volume with minimal failure. Touch the volume potentiometer with a screwdriver intermediate point no response, it is confirmed that the fault part in low-sounding. Measured low put 5BG_1,5BG_3,5BG_4 each pole voltage are normal. Upon inquiry, the user is informed that the machine has been repaired by another person and the fault will be observed immediately upon retrieval. So, find the new component for compliance with the requirements, the results found that the new volume potentiometer for resistance of only 4.7kΩ. With a 100kΩ potentiometer replacement, test machine returned to normal. Example 2: The model above, there is a sound, no grating fault. The measuring tube c pole voltage is 24V, the power supply voltage is 10V. Adjust 6W_1, so that the power supply voltage to 12V, trip tube voltage increased to 28.5V c, measuring tube