Subject: | |
From: | |
Reply To: | TechNet E-Mail Forum. |
Date: | Wed, 24 Apr 2002 08:16:20 -0400 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
This is a tool only.
The non-function should be diagnosable to more orders of magnitude of
accuracy than you are stating. if it is timing only.
If the freeze spray trick is repeatable, a competent design engineer should
be able to give you more informational symptoms than just "it goes now".
That's how you'll find your answers using this tool.
RL
RL
----- Original Message -----
From: "Ken Carlile" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 24, 2002 12:11 AM
Subject: [TN] Freeze Spray Trouble Shooting
> We recently received a prototype batch of 4 boards and experienced 4 for 4
> failing test. Our techs sprayed down certain chips with Freeze Spray and
> the board began working properly, at least for a short period of time. I
> have checked prior tech net postings and have found fantastic responses as
> to why Freeze Spray can damage a the IC or board, but can anyone explain
why
> they would begin functioning properly. Being a rookie component engineer
I
> can fully understand the issues related to freeze spray, but out techs and
> design engineers are just going to point the finger since their units work
> when sprayed. To further complicate the matter the chips that are being
> sprayed are not all the same manufacturer and I can easily rule out a
> component failure. Our senior engineer thinks that it may be timing
related
> since the main circuit being froze is the Altera PLD (20K400E) and related
> circuitry.
>
> Can anyone defend the use of Freeze Spray?
>
> Can anyone present a logical failure mechanism?
>
> /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
>
> The best Freeze Spray argument to date was Werner Engelmaier's:
>
http://jefry.ipc.org/scripts/wa.exe?A2=ind9907&L=TechNet&D=0&m=23823&P=55370
>
> However this points to failure after spray not the opposite.
>
> --------------------------------------------------------------------------
-------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt delivery of Technet send e-mail to [log in to unmask]:
SET Technet NOMAIL
> To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
> --------------------------------------------------------------------------
-------
>
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
|
|