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例6 机型:日立VT-747E型故障现象:带金卡在仓内出不来,插上电源后显示屏有显示,按动电源操作键后指示灯亮,但数秒钟后电源自动保护。打开顶盖发现带盒加载到位,但上带未到位。分析与检修:本例故障现象和原因都与例1相似,但有一点明显区别,即带盒已加载到位,且有上带动作,说明带仑机构基本无故障。由于磁带有上带动作(日立747E机为全加载方式,插入带盒,装盒到位后即自动上带),表明上带(加载)电机及其驱动电路基本正常;但上带不到位,电源自保,很可能是上带机构
Example 6 Model: Hitachi VT-747E type Symptom: with a gold card in the warehouse can not get out, plug in the power display after the display, press the power button after the operation indicator light, but a few seconds after the power automatic protection. Open the top cover and found the cassette loaded in place, but the tape is not in place. Analysis and Overhaul: The phenomenon and causes of this example are similar to Example 1, but there is a clear difference, that is, the tape cartridge has been loaded in place, and there is an upper belt movement, indicating that the belt-free mechanism is basically trouble-free. As the tape has a belt action (Hitachi 747E machine is fully loaded, insert the cassette, the cassette is automatically placed on the belt), that on the belt (loading) motor and its drive circuit basically normal; but with not in place, the power supply Self-protection, it is likely to bring the body