Hello
can i have please a documentation about ''short circuit PCB''
thx

Is this what you are looking for?

http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

... and http://www.users.on.net/~fzabkar/HDD/ (photo clips)

_________________
A backup a day keeps DR away.

thank you for the great links
i m looking for why and how short circuit hdd pcb.
thx thx

The TVS diodes commonly go short circuit due to an overvoltage when the power supply fails.

_________________
A backup a day keeps DR away.

I m talking about short circuiting two pins on the mother board of a HDD for repairing not detectable device of some thing like that.
like this post http://www.forum.salvationdata.com/view ... ilit=short

thx

You mean shorting the read channel.

Tip: How to identify the Read Channel test points:
http://malthus.zapto.org/viewtopic.php?f=24&t=123&p=149

Preamp Block Diagrams:
http://malthus.zapto.org/viewtopic.php?f=59&t=229&p=582

_________________
A backup a day keeps DR away.

Thx Thx Thx

Hello
can you show me the steps of short circuit PCB?
thx

So you have a 7200.12 and you want to short the read channel? If so, then use a pair of fine tipped tweezers, short the relevant test points, and then power up the drive. You can release the tweezers after you gain access.

http://images.google.com/images?q=tweez ... o&tbm=isch

I suggest that you cover the tweezers in heatshrink tubing to minimise the risk of damage to your PCB in the event that you drop them.

_________________
A backup a day keeps DR away.

thx that what i m looking for
thx