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故障现象:该机频谱指示有显示,但收不到调幅广播。分析与检修:日立HTA—55F是较高档次的音响,其收音的调谐使用频率合成方式。由于其调频段正常,说明其微处理器基本正常,问题可能在于: 第一,AM开关接触不良或损坏。第二,微处理器的波段开关不正常。第三,输出接口电路不正常。检查时如果发现AM开关在按下时不通,可取下用无水酒精清洗,若开关通,按下AM和FM开关。同
Symptom: The aircraft spectrum indicator shows, but can not receive AM broadcast. Analysis and Overhaul: Hitachi HTA-55F is a higher grade sound, the tuning of the radio frequency synthesizer. Due to its FM section of the normal, indicating that the basic normal microprocessor, the problem may lie in: First, the AM switch bad or damaged. Second, the microprocessor band switch is not normal. Third, the output interface circuit is not normal. Check if you find that the AM switch is blocked when pressed, you can remove the use of anhydrous alcohol cleaning, if the switch, press AM and FM switch. with