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[例1] 故障现象 接收丽音节目时,丽音按键不起作用,且“STEREO”或“DUAL”指示灯不亮。 分析与检修 以上故障现象说明丽音电路的电源异常,或CPU微处理器不能识别丽音信号。首先检查IC202(TDA8732)第④、⑿脚及IC203(SAA7280)第④、⒅脚的+5V供电电压,电压正常,说明供电电路正常。再将频率计接于IC203第⒆脚,无输出信号,这说明振荡器未起振。更
[Example 1] Symptom The humming button does not function when you receive the Hirano program, and the “STEREO” or “DUAL” indicator does not light. Analysis and maintenance of the above symptoms that NICO circuit power supply abnormalities, or CPU Microphone can not identify NICAM signal. First check IC202 (TDA8732) ④, ⑿ feet and IC203 (SAA7280) ④, ⒅ feet of +5 V supply voltage, the voltage is normal, indicating the normal power supply circuit. Then the frequency meter connected to IC203 the first foot, no output signal, indicating that the oscillator has not started. more