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故障现缺 一台上海牌Z647—1A彩电,伴音小而沙哑失真,图像正常。 分析与检修 显然故障出在伴音电路。该机伴音电路由伴音集成块IC601(TA7243P)、TV/AV转换集成块IC201(IC4053BP)、三极管V606、V604、V605等组成。经检测,IC201及V604～V606直流状态正常。试从一收音机中引出音频信号,加到IC601的6脚(该脚为内部音频功放的输入端),结果声音很大且不失真,表明IC201、V604～V606及伴音功放均无问题,故障出在中放电路。
Trouble is a lack of a Shanghai brand Z647-1A color TV, sound small and husky distortion, the image is normal. Obviously the fault analysis and troubleshooting sound circuit. The machine sound circuit consists of audio IC601 (TA7243P), TV / AV converter IC201 (IC4053BP), transistors V606, V604, V605 and so on. After testing, IC201 and V604 ~ V606 DC state is normal. Try to lead the audio frequency signal from a radio, add to 6 feet of IC601 (this foot is the input end of the internal audio frequency amplifier), the result is loud and not distorted, show IC201, V604 ~ V606 and sound power amplifier have no problem, In the discharge circuit.