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故障现象:伴音不能关闭,音量不能控制。排障与故障分析:本机采用TDA8361/8362构成中放及其行、场等小信号处理电路,由TDA7506B作伴音功放电路,还原伴音,CPU采用HaierTG7103.2,ksm9848·6N来完成对各种系统的控制任务。由于本机音量失控,所以检修应以控制音量的电路作为突破口。
Symptoms: sound can not be turned off, the volume can not be controlled. Trouble shooting and fault analysis: The machine adopts TDA8361 / 8362 to form a small signal processing circuit in the line, field and so on. The TDA7506B accompanies the sound amplifier circuit to restore the sound. The CPU uses HaierTG7103.2 and ksm9848 · 6N System control tasks. Due to the loss of local volume control, so the maintenance of the circuit should be controlled volume as a breakthrough.