日本电子维修技术 一个希捷80G死硬盘的修复（转）
译文链接： http://.cn/viewthread.php?tid=22581
Fixing a dead Seagate 80gb drive
In case this helps someone else:
A colleague was given a broken PC. They were told that the power supply had blown, and the owner decided to buy a whole new PC rather than bother to fix it. I was asked to to try to get it to go. I tried a different ATX power supply and after some false starts I got most of the PC going again. It had two internal drives; a 10GB IBM drive plus a Seagate 80gb (ST380023A Barracude V). One thing I did find was that even with a new ATX PSU, the PC would not turn on with just the power of the 80gb drive connected. There was something seriously wrong with the 80gb drive. Anyway, I returned the PC and said both the power supply and the 80gb drive were broken, so they'd at least have to get a new PSU. I kept the 80gb drive since it was 'junk'.
But I was quite curious about the 80gb drive. I measured across the power connector. Between +5V and GND was some resistance, but +12V to GND seemed like a short circuit. Fortunately I actually had a working Seagate ST380023A Barracude V drive in another machine, so I pulled it out to compare. Interestingly this drive was bought from the same shop during the same month (per the warranty sticker) and had the same firmware version, but the logic boards were actually slightly different. Anyway, on my working drive, I traced where the +12V line went and found a few things it connected to. One of these was a little black square with markings BUX C240 with two pins on it (which I think is a diode). Its down near where the Power supply connector comes in. By desoldering one end of this from the dead hard drive, I could see that the short circuit between +12V and GND was removed. I have a diode tester on my multimeter and I could see that the BUX C240 was shorted out. My working 80gb drive had a similarly placed black square which I could see was not shorted out. It had the markings BUF C242 I think. I then scrounged through my junk pile and found an old 630MB hard drive that was dead and desoldered a diode from it (well I think it was a diode - it was a black square with a line on one end and had two pins on it). I can't remember what the markings were. I soldered it in place of the BUX C240 on the dead drive making sure the line on the packaging was oriented the same way.
I then powered it on and suffice to say it now works perfectly. I have been told by more wise electronics experts that the diode may be a zener diode to provide over voltage protection and that my generic replacement might not protect it from over voltage ... but hey it works for now.
Update (Dec 2004)
I came across a Seagate 40gb drive in an online auction advertised as:
Was working one day then stopped during a storm - never to go again
Of course, I had to bid on it to see whether it had the same seized diode fault ... didn't I? Well, NZ$7.50 later I had said 40Gb drive. This time it was shorted out between +5V and GND. Between +12V and ground was fine. Poking around with my multimeter I soon found a diode that was shorted. I replaced the diode and the drive seems to work fine now. Too easy.
[ 本帖最后由 张先生 于 2007-11-17 15:14 编辑 ]
评论
看不懂！！！！！！！！！
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不知楼主发此有何用意。
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给看得懂的人看。搞硬盘维修总要懂点英文吧！最好还要懂俄文！
[ 本帖最后由 张先生 于 2007-11-9 11:46 编辑 ]
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修硬盘是智力活儿，希望张老多发些。
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老张，你这些是重那里转过来的，我想多看点
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国外论坛，偶遇。
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谢谢老张!!!!!!!!!收藏了
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天书啊!不过努力学习中啊!
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看不出来。张老师 英文也这么牛
不研究盘 还真吃亏
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看来你有所不知了,张老师在美国做学术研究一年多,E文能不牛?
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天书啊!不过努力学习中啊!
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......张老的qq是多少，说下 ，当我老师算了。
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英语学的不好看不懂呀真无耐~~~~~~~~~~~~`
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呵呵看了半天小字好累眼睛
大致意思是朋友的电脑坏掉了，查来查去是硬盘12V导致的ATX电源不上电
呵呵貌似这种问题相当多，今天还做了个这样盘的数据恢复，简单换个二极管200元到手
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与希捷硬盘系列型号一样，迈拓的这些系列名称并不能代表具体产品型号的含义，所以下面也举个例子来具体说明如何辨别迈拓硬盘型号编号方式 电路 电子 维修 我现在把定影部分拆出来了。想换下滚，因为卡纸。但是我发现灯管挡住了。拆不了。不会拆。论坛里的高手拆解过吗？ 评论 认真看，认真瞧。果然有收 电路 电子 维修 求创维42c08RD电路图 评论 电视的图纸很少见 评论 电视的图纸很少见 评论 创维的图纸你要说 版号，不然无能为力 评论 板号5800-p42ALM-0050 168P-P42CLM-01
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