"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.