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GPX牌DM300型组合音响主要由录放电路(TA8189)、收音电路(AN7205、TA7640、TA7343)、音量调节电路(PT2253)、功放电路(TA8227)、EQ电路,主机电源电路、CD电源、C、K板(CD.KEY.PCB,主要由47C820DF-NC11担任)、C、D主板电路等组成。笔者在GPX牌—DM300型组合音响的维修实践中总结出一套经验,就是速修整机无声故障,供同行参考。影响或造成GPX牌—DM300型组合音响整机无声故障的关键电路及电压是:(1)TA8227集成电路①、(12)
GPX brand DM300 is mainly composed of recording and playing circuit (TA8189), radio circuit (AN7205, TA7640, TA7343), volume control circuit (PT2253), power amplifier circuit (TA8227), EQ circuit, main power circuit, CD power supply, Board (CD.KEY.PCB, mainly by the 47C820DF-NC11), C, D motherboard circuit and other components. The author in the GPX card-DM300 combination of audio repair practice summed up a set of experience, is speed repair machine silent failure for peer reference. The key circuits and voltages that affect or cause the silent failure of GPX-DM300 composite audio system are: (1) TA8227 integrated circuit ①, (12)