[pcductape] Re: Corroding contact fingers, Right way to clean.

  • From: "Bob Noble" <bnoble@xxxxxxxxx>
  • To: <pcductape@xxxxxxxxxxxxx>
  • Date: Sun, 19 Dec 2004 11:02:47 -0800

Hi Sandi,
Trying to be simple huh? I know what you mean. It takes a lot of writing to get this kind of stuff across. :O) As I remember you used to work in for the phone company, so worked with this kind of stuff a lot.
Bob Noble
www.sonic.net/bnoble
----- Original Message ----- From: "Huntress" <sanneumann@xxxxxxxxxxx>
To: <pcductape@xxxxxxxxxxxxx>
Sent: Sunday, December 19, 2004 10:41 AM
Subject: [pcductape] Re: Corroding contact fingers, Right way to clean.



Thanks for the explaination and I'm ashamed to admit that I already knew this. I was trying to be simple. ;-)


----- Original Message ----- From: Bob Noble
To: pcductape@xxxxxxxxxxxxx
Sent: Sunday, December 19, 2004 1:00 PM
Subject: [pcductape] Corroding contact fingers, Right way to clean.



Contact fingers is one of the things I worked on at HP. Like why do they not
make contact. Sorry about the carbon, not so. It happens mostly because
there is very little gold on the contacts. Gold is expensive. You have to
plate enough of it to close most of the holes in the plating, but that takes
a lot of gold, so they just barely plate enough to close most of them.
Closing all of them is almost impossible anyway.
What happens is moisture in the air helps make a small battery out of the
different metals and it produces by products that are like crystals that
actually form an eruption at a hole site. As it erupts from corrosion, it
lefts the fingers. This is similar to what happens when you see rust. Rust
is the eruption stuff. But it's iron so it looks brown. The contact salts
are green to blue, mostly, if you can see them. You need a good microscope
to see most of them. Now when the crystalline salts are wet, they are
conductive, but when they dry, they are insulators, so bad connection.
This is one of the reasons your computer might not work at home, but when
you put it in your car and take it down a bumpy road to the shop, it
vibrates and may clear. When you get to the shop, it all works fine, until
you take it home and the process continues and eventually, the same problem,
again.
We determined that an eraser should not be used as it just also removes more
gold so you can make the problem even worse in time.
The right way to clean them is with a combination of about seventy five
percent alcohol to twenty five percent clean water. A lint free cloth is
used. Just water or just alcohol will work ok too.
This is also why you will see grease like substance on phone contacts and
other contacts. Grease will work fine for this, as long as contacts don't
open and close like in a relay. If they open and close, the grease stuff
will burn when it makes or breaks contact and then, Sandi, the carbon stuff
will form. The grease stuff forms a barrier to moisture and air, two things
you also need to cause corrosion. Oil in the grease is what forms the
barrier. So, one could also use a small bit of oil also.


More then you wanted to know. :O)
Bob Noble
www.sonic.net/bnoble
----- Original Message ----- From: "Huntress" <sanneumann@xxxxxxxxxxx>
To: <pcductape@xxxxxxxxxxxxx>
Sent: Sunday, December 19, 2004 7:59 AM
Subject: [pcductape] Re: STOP error (moved to Freelists)



He's saying that he has had this happen on a few Dells recently and the
problem was with the RAM contacts becoming dirty so you have to take them
out and clean them with a pencil eraser and put them back in. The "dirt"
is actually carbon deposits that can be caused by voltage fluctuations. :-)


Sandi
----- Original Message ----- From: trapper
To: pcductape@xxxxxxxxxxxxx
Sent: Saturday, December 18, 2004 11:41 PM
Subject: [pcductape] Re: STOP error (moved to Freelists)



Are you saying that a re-seating of his memory is all that is needed??


David Emery wrote:
I have run into a few Dells lately that I have had to remove and clean
the memory with an eraser and reseat them, caused all kinds of problems from
no boot to erratic problems. Sorry I didn't see your post earlier. Dave
At 02:19 AM 12/18/2004 -0600, you wrote:


       Hi De,

       I cannot boot to bios.
       I cannot boot to A drive.
       I cannot boot to my CD drive.
       I cannot boot to my DVD drive.

I was able to run Dell's dynastic (I used Ctrl+Alt+D keys) and both
drives are ok. I still cannot boot to bios nor any drives, although I do
see the light come on when I turn the computer back on; that is the A drive
lights up and the CD drive lights up (the DVD drive does not light up), yet
the system will not stop on A nor CD drives. It will only go to the blue
screen with the error message.


       I no longer have possession of the machine;   it's in my friend's
 computer repair shop.

       Carl

----- Original Message ----- From: DGrell7446@xxxxxxx
To: pcductape@xxxxxxxxxxxxx
Sent: Friday, December 17, 2004 7:58 PM
Subject: [pcductape] Re: STOP error (moved to Freelists)



In a message dated 12/17/04 1:49:56 PM Central Standard Time, ctm007@xxxxxxxxxxxxxx writes:


I'm thinking the same thing. I'm thinking the registry is
corrupt and maybe non exist. Maybe a virus or Trojan delete my registry.
A good lesson in all this is to make a copy of the registry and put it on a
cd for safe keeping. But, my issue is, I cannot get to an A nor CD
prompt.
Carl
My crash was caused by an inproper shutdown.
Check your bios setup for the first boot device and set it to what
you would like.
When I totally wiped the drive (I could not get the repair program
to run) and reinstalled I had to boot from the 4 floppy disks that I made
from the Win2000 make a disk directory and then it directed setup to the CD
and it installed Win2000.
If you have not made these disks and need a NTFS boot disk (to
read your hard drive so you know that it is ok) go to NTFS.com (hope that is
the correct address) and get one. That is where I got one and was able to
read my hard drive. Alot to the disk that I was not sure of, it is a neat
disk tho.
HTH
De



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