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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Unknown Zener-Diode ???
Hello,
I've got a problem. A friend of mine managed to plug in the power supply of his external harddrive upside down, which damaged both, harddrive and usb-interface. Now I'm trying to repair at least the harddisk, which has short-circuit in the 5V-supply-line, caused by a defective Zener-Diode. As it is an SMD-Diode it has no value written on it, but : GE R610 If I had to guess, I would say it is a 5.1V, but I'm not sure. So can anybody help me. BTW the harddrive is a Seagate Barracuda 320GB/7200rpm. Thanks in advance Chris |
#2
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Unknown Zener-Diode ???
Christian Skrajewski wrote:
Hello, I've got a problem. A friend of mine managed to plug in the power supply of his external harddrive upside down, which damaged both, harddrive and usb-interface. Now I'm trying to repair at least the harddisk, which has short-circuit in the 5V-supply-line, caused by a defective Zener-Diode. As it is an SMD-Diode it has no value written on it, but : GE R610 If I had to guess, I would say it is a 5.1V, but I'm not sure. So can anybody help me. BTW the harddrive is a Seagate Barracuda 320GB/7200rpm. Thanks in advance Chris if it's going across the legs, (+ to common), I would say it most likely is a TVS (Transient Voltage suppresser) or like it. and if it is across the 5 volt line, then it's obvious that it must be around 6 or more volts for protection. 5.1 would be a little to close for ZENER diodes. -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#3
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Unknown Zener-Diode ???
"Jamie" t wrote in message ... Christian Skrajewski wrote: Hello, I've got a problem. A friend of mine managed to plug in the power supply of his external harddrive upside down, which damaged both, harddrive and usb-interface. Now I'm trying to repair at least the harddisk, which has short-circuit in the 5V-supply-line, caused by a defective Zener-Diode. As it is an SMD-Diode it has no value written on it, but : GE R610 If I had to guess, I would say it is a 5.1V, but I'm not sure. So can anybody help me. BTW the harddrive is a Seagate Barracuda 320GB/7200rpm. Thanks in advance Chris if it's going across the legs, (+ to common), I would say it most likely is a TVS (Transient Voltage suppresser) or like it. and if it is across the 5 volt line, then it's obvious that it must be around 6 or more volts for protection. 5.1 would be a little to close for ZENER diodes. -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 DC inputs often have a regular diode across them with the anode to the + side to limit damage in the event of reverse polarity. Try just removing the diode and see if it works. Mark Z. |
#4
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Unknown Zener-Diode ???
"Mark D. Zacharias" wrote in message . net... "Jamie" t wrote in message ... Christian Skrajewski wrote: Hello, I've got a problem. A friend of mine managed to plug in the power supply of his external harddrive upside down, which damaged both, harddrive and usb-interface. Now I'm trying to repair at least the harddisk, which has short-circuit in the 5V-supply-line, caused by a defective Zener-Diode. As it is an SMD-Diode it has no value written on it, but : GE R610 If I had to guess, I would say it is a 5.1V, but I'm not sure. So can anybody help me. BTW the harddrive is a Seagate Barracuda 320GB/7200rpm. Thanks in advance Chris if it's going across the legs, (+ to common), I would say it most likely is a TVS (Transient Voltage suppresser) or like it. and if it is across the 5 volt line, then it's obvious that it must be around 6 or more volts for protection. 5.1 would be a little to close for ZENER diodes. -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 DC inputs often have a regular diode across them with the anode to the + side to limit damage in the event of reverse polarity. Try just removing the diode and see if it works. Mark Z. Sorry - that should read CATHODE to the + side. Mark Z. |
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