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D100 启动屏幕亮碟不转

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Post time 7 hour(s) ago | Show all posts |Read mode
顾老师您好,我的D100启动屏幕显示0,但是碟片不转,查到+B测量点电压才1.4V,-B电压5.1V正常,更换IC401后故障一样,IC401的7脚波形正常,10脚为1.4V直流无波形,查+B测量点到IC401的14脚之间电阻、线路都正常,14脚电压约0.45V,请问后续该如何检查啊,没思路了,谢谢。机器是ic501附近5个电位器的版本。
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