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例1 机型:松下TC—817型彩电故障现象:屏幕图像严重散焦,无法收看分析检修:经检查该机聚焦电位器内部开路,使聚焦电压升高,造成上述故障。该聚焦电位器与行输出变压器组成一体化结构(如图1所示),采用外加电阻进行分压可使聚焦电压降低,即在显像管聚焦极端子上对地接一只40～50MΩ/2W的电阻(具体阻值由调试中决定),即可以排除故障。例2 机型:德律风根彩电故障现象:聚焦不良分析检修:德律风根有许多型号的彩色电视机聚焦电位器不密封(分离式),它安装在显像管插板处,时
Example 1 Model: Panasonic TC-817 color TV Fault phenomenon: the screen image is seriously defocused, can not be viewed Analysis Maintenance: After checking the machine focus potentiometer internal open circuit, the focus voltage increases, resulting in the above failure. The focus potentiometer and line output transformer form an integrated structure (as shown in Figure 1), the use of external resistors to reduce the focus voltage can be reduced, that is, in the CRT focus on the terminal to a 40 ~ 50MΩ / 2W Resistance (specific resistance determined by the commissioning), that is, to troubleshoot. Example 2 Model: Telefunken TV Fault Symptom: Poor Focus Analysis and Maintenance: Telefunken There are many models of color televisions focus potentiometer not sealed (separate), it is installed in the CRT flapper, when