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例1故障现象:按下调谐按钮时,喇叭发出瞬间噪声,随后正常静噪。分析检修:该机型的静噪电路系由TC9307第(31)脚在无信号时输出高电平,使TA8132第(19)脚输出的音频信号与地交流短路以达到静
Example 1 Symptom: When the tuning button is pressed, the horn makes an instantaneous noise and then normalizes the noise. Analysis and maintenance: The model of the squelch circuit by TC9307 (31) feet in the absence of signal output high, the TA8132 (19) pin audio signal output and AC short circuit to achieve static