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故障现象 接通电源,显示屏显示正常,同时电源指示灯亮,机内发出“吱吱”声。几秒钟后,电源指示灯熄灭。磁带能插入,且磁鼓即转动,但操作不起作用。 分析与检修 故障现象说明机器处于自停保护状态。初步判断故障出在系统控制及状态检测电路。首先检查系统控制微处理器IC6001(80)脚电源开关控制端,发现在电源接通时,电压为5V,机器自停时降为1V左右。进一步测②、③、④、⑤脚电压,发现③、⑤脚电压只有2.5V左右,远低于正常值5V。再检查状态检测电路。状态检测电路如附
Fault phenomenon connected to the power, the display shows normal, while the power indicator light, the machine issued a “creak” sound. After a few seconds, the power light goes off. The tape can be inserted and the drum rotates, but the operation does not work. Analysis and troubleshooting Symptoms that the machine is in the self-stop protection. Judgment of the initial fault in the system control and status detection circuit. First check the system control microprocessor IC6001 (80) pin power switch control terminal and found that the power is turned on, the voltage is 5V, the machine down to about 1V from the stop. Further measured ②, ③, ④, ⑤ pin voltage, found ③, ⑤ pin voltage is only 2.5V or so, much lower than the normal 5V. Re-check the status detection circuit. State detection circuit attached