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 |
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 |
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. |
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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