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故障现象 图像正常,但伴音声小。按动遥控器音量调节键可在屏幕上看到SONUD符号由少到多变化正常。符号调至中间程度时才可听见音量很小的伴音,调至最多时反而无声。 分析与检修 该机采用Mμ两片机电路程式。根据故障现象,首先检查功放集成电路LA4265及与其连接的两个扬声器,发现LA4265各脚电压正常,扬声器支路也无故障,遂怀疑伴音输入回路可能有阻容元件变
Trouble phenomenon image is normal, but the sound is small. Press the remote volume control keys on the screen to see SONUD symbols change from less to more normal. Symbols can be heard until the middle of the volume is very small sound, transferred to the maximum but silent. Analysis and maintenance of the machine using Mμ two circuit. According to the fault phenomenon, first check the amplifier integrated circuit LA4265 and the two speakers connected to it and found that the voltage of each leg of the LA4265 is normal, and the speaker branch is fault-free. Therefore, it is suspected that the sound input circuit may have resistive components