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请教顾大师,sony D99开机就关机的问题

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Post time 2024-08-13 10:21:02 | Show all posts |Read mode
向顾大师请教下,sony D99,按下播放键,屏幕显示一下,然后马上关机,电池电源都这样,但是如果短接test,机器能正常进入test模式,不知道这种情况从哪里查起呢,电源部分的电容都换过了。


我测量过cxp5086 的30脚,未开机前是3.5伏,开机瞬间电压降为0.关机后电压恢复到3.5v。如果把这个脚接地,通电就开机,且停止播放键无法关机。


现在网上能找的资料太少了,还望顾大师有空指点迷津!!感谢!
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Post time 2024-09-10 10:52:10 | Show all posts
本站有D99图纸。
CXP5086脚30是整机开机信号。
你的问题可能与STOP按钮短路有关。你现在可以开机,说明开机6大条件(U电源,晶振,复位,门开关,HOLD,PLAY按钮)满足。你把STOP按钮拆下来看看。
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 Author| Post time 2024-09-10 19:02:47 | Show all posts
太感谢了,我按您说的方法检查一下,维修手册已经下载了,无奈电路方面实在小白,CPU的关机条件除了stop,门开关,电量不足,还有其它的关机条件吗?

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读盘失败也会关机但是没有这么快的。像是STOP被按住了。  Post time 2024-09-11 10:13
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 Author| Post time 2024-09-10 19:47:15 | Show all posts
顾大师能推荐下cd机维修资料的书籍吗?尤其是芯片资料类的

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https://item.jd.com/10104742999353.html 这本是我当年用的,希望对你有帮助!  Post time 2024-09-11 10:15
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 Author| Post time 2024-09-12 11:58:08 | Show all posts
顾大师,您推荐的书籍我已经下单了,国内还能买到,然后我按您说的方法检查了stop键,即使拆下来也还是一样的故障,CPU的15脚stop的电压一直都是3.4伏。仓门开关我也已经短接了。
另外,我手上还有台D250,插电源的时候跟这个D99一模一样的症状,但是用电池正常开机。我还检查了CPU的64脚电压,发现开机瞬间这个电压突然会掉,然后恢复到3.2伏。测量MPC1716的21脚VCPU电压,也是会这样。用电池的时候64脚电压不会突然掉,而是会下降到2.5伏左右。
方便的时候,还请您答复一下,感激不尽!
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 Author| Post time 2024-09-13 19:49:58 | Show all posts
奇怪,我再次检查这个引脚的时候发现电压又是正常的了,我打算拆下全部电容,彻底清洗主板,检查下过孔试试。
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