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一台兰光LG—903D1组合音响,出现L声道中、高音无输出故障。分析是功放电路(见附图)有问题。测L声道功放块IC1(LM1875T)的在路电阻和静态电压,发现与R声道功放块IC2(LM1875T)的在路电阻和静态电压(LM1875T的正常值见附表)偏差较大。
A blue LG-903D1 combination of audio, there L channel, treble no output failure. Analysis is the amplifier circuit (see photo) there is a problem. Measure the on-path resistance and quiescent voltage of the L-channel amplifier block IC1 (LM1875T) and find a large deviation from the on-path resistance and quiescent voltage of the R channel amplifier block IC2 (LM1875T) (see the attached table for the normal value of the LM1875T).