ement.
Dave Cuthbert
Micron Technology
From: Chundru, Ram [mailto:rchun...@ti.com]
Sent: Thursday, August 25, 2005 10:17 AM
To: drcuthbert; f...@dctolight.net; peterh...@aol.com
Cc: emc-p...@ieee.org
Subject: RE: ESD help for I/O ports
Dave,
With all due respect, I would like to make a small
...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
drcuthb...@micron.com
Sent: Thursday, August 25, 2005 10:11 AM
To: f...@dctolight.net; peterh...@aol.com
Cc: emc-p...@ieee.org
Subject: RE: ESD help for I/O ports
Being that there is no metal chassis the connector shell most likely has
a direct path
drcuthb...@micron.com wrote (in
) about
'ESD help for I/O ports', on Thu, 25 Aug 2005:
>Being that there is no metal chassis the connector shell most likely
>has a direct path to the circuit board.
Well, preferably not. But if it HAS to go to the board, it should go by
a wire (as thick as is p
ehalf Of Fred
Townsend
Sent: Wednesday, August 24, 2005 7:14 PM
To: peterh...@aol.com
Cc: emc-p...@ieee.org
Subject: Re: ESD help for I/O ports
I don't know what your definition of a 'true ground' is but the facts
are simple. If you share a discharge path with a signal path the
dischar
David Heald wrote (in )
about 'ESD help for I/O ports', on Wed, 24 Aug 2005:
>See section 7.1.3 of 61000-4-2 for guidance on how to bleed off the
>charge between impulses.
I think this is a very significant point. Nowhere does the OP say which
standard is being applied. ESD testing of Class I
I don't know what your definition of a 'true ground' is but the facts
are simple. If you share a discharge path with a signal path the
discharge will overwhelm the signal and the device will fail, sometimes
catastrophically. You have obviously created a signal ground. Now create
a discharge gro
Peter,
Have you tried discharging the built-up charge on the printer between
impulses. If the power supply lacks a ground (and therefore the product has
no way to bleed off the energy), this could be an issue.
See section 7.1.3 of 61000-4-2 for guidance on how to bleed off the charge
between im
Peter Hays wrote
>> The problem that I have is that my power supply is a class II product.
i.e. I do not have a true ground and also as we all know the printer is in
a plastic box. <<
As usual, troubleshooting telepathically is not all that reliable, and my
clairvoyance is on the blink just now, t
The problem that I have is that my power supply is a class II product. i.e. I
do not have a true ground and also as we all know the printer is in a plastic
box.
thanks
Pete
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list.Website: http://www.ieee-pse
No I am zapping to the shell of the parallel connector.
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To post a message to the list, send your e-mail to emc-p...@ieee.org
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There are many ways you can run into ESD problems but I were to guess
I'd say you have a ground bounce problem. That usually happens when the
discharge path is the same as the signal path. If possible have a
perimeter ground connected to chassis and another ground for your signal
back to the po
...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
drcuthb...@micron.com
Sent: Monday, August 22, 2005 1:23 PM
To: peterh...@aol.com; emc-p...@ieee.org
Subject: RE: ESD help for I/O ports
Peter,
Can you tell me what the failure mode is?
Dave Cuthbert
Micron Technology
From: emc-p
The failure mode is that after a couple of discharges, the printers lock-up
and stop printing and basically looses its print job.
thanks
Peter
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list.Website: http://www.ieee-pses.org/
To post a message to t
Peter,
Can you tell me what the failure mode is?
Dave Cuthbert
Micron Technology
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
peterh...@aol.com
Sent: Monday, August 22, 2005 11:20 AM
To: emc-p...@ieee.org
Subject: ESD help for I/O ports
Hello group,
I am involved in
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