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故障现象:当按下电源开关后,指示灯亮,但放入磁带后,不能重放、前进、倒带,随即指示灯熄火,停机保护。分析检修:根据现象分析,故障可能有以下两点:一、电源电路不能输出正常电压,致使系统发出停机保护信号;二、系统控制电路有故障,不能发出操作指令。为此,先查开关电源电路,测开关电源次级输出端电压,发现非受控电源输
Symptom: When you press the power switch, the indicator light, but after the tape, you can not replay, forward, rewind, then the lights turn off, down protection. Analysis and maintenance: According to the analysis of the phenomenon, the fault may have the following two points: First, the power circuit can not output the normal voltage, resulting in system shutdown protection signal; Second, the system control circuit is faulty and can not issue operation instructions. To this end, first check the switching power supply circuit, measuring the secondary output voltage switching power supply and found that uncontrolled power transmission