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三、常见故障检修实例例1 故障现象:有图像无伴音,用遥控器打开超重低音功能,屏幕显示符号正常,但无超重低音输出。检修方法:由现象分析,判断故障发生在正常伴音和超重低音这两部分电路的公共点上,因为这两种伴音在中放级和检波级是合在一起的,而且在末级音频放大电路中又共用一路+26V电源,只是在中间一段放大电路中两种伴音的取用频率不同,是分开的,所以这两部分同时发生故障的可能较小,应从末级电路入手检查。首先检查IC801(TDA2009)的电源供电回路⑨脚天+26V,这是引起无伴音的主要原因。再检查开关
Third, common troubleshooting examples Example 1 Symptom: There is no sound image, with the remote control to open the bass function, the screen shows the normal symbol, but no overweight bass output. Maintenance methods: from the phenomenon of analysis to determine the fault occurred in the normal sound and subwoofer circuit of the two parts of the common point, because these two kinds of sound in the release level and the detection level is combined together, and in the final audio amplifier circuit In addition, all the way +26 V power supply, but in the middle of a magnifying circuit in two different sound frequency access is separate, so the two parts may be smaller at the same time the failure should start from the last level of inspection. First check the IC801 (TDA2009) power supply circuit ⑨ feet days +26 V, which is caused by the main reason for no sound. Then check the switch