Bev, Years ago (about 7) there was a company selling hand held Vortex generators that plugged into 100 psi shop air. These little jewels put out -40 degree C air as long as there was 100 psi available. It also had to be dry nonlubed air. The company was called EXAir. I don't know if they are still around. David A. Douthit Manager LoCan LLC Bev Christian wrote: > And I would like to point out yet again that most of these materials are > fully fluorinated materials that have incredibly long atmospheric lives and > thus have terribly high global warming potentials. I would recommend using > food grade carbon dioxide instead. You can buy a "gun" to put on the > compressed gas tank to aim the liquid/gas at the component in question. > Sorry I can't remember the name of the company right now, but if you check > the archives under my name for the '96 to '98 time frame you might find it. > And others might chime in to augment my failing memory. ;( > > regards, > Bev Christian > Research in Motion. > > -----Original Message----- > From: Carl VanWormer [mailto:[log in to unmask]] > Sent: April 24, 2002 10:23 AM > To: [log in to unmask] > Subject: Re: [TN] Freeze Spray Trouble Shooting > > As to the cause of your problems, I vote for timing problems, with a close > second guess at system noise caused by impedance mismatch on long control > signal lines. > > I'm Carl and I'm a Freeze Spray user . . . > > Now that I've got that off my chest, I'd like to say that I seldom wreck > stuff, and can usually find thermal mechanical intermittents and > (particularly) timing problems. Frozen parts seem to have faster transition > edges. A long time ago, I was able to make our 4 MHz Z-80 processor system > work at 7.8 MHz by freezing the processor, EPROM, and RAM chips (with a > variable oscillator for testing). Recently, I've found that I could fix (or > cause to fail) a new design by squirting the Altera (EPLD) or processor. > The culprit was "timing" and a poorly designed (overloaded) set of control > and bus lines. The difference in timing between the Altera latching in the > correct and incorrect data was seen to be about 1/2 nano-second. By > selective heating (and/or cooling) of the various chips, I could "adjust" > the timing to make the device work or fail. Of course, we had to fix the > timing problem, but my first line of discovery is (often) Freeze Spray. > When I've run out of the stuff, I grab the "Dust-Off" can and run it in > "inverted" mode to get the Freeze Spray effect. > > p.s. After reading items in this forum about BGAs and circuit cooler, I've > vowed to never squirt the BGA packages. There is waaaaaaay too much chance > of wrecking something there, since there are no leads to absorb the flex > caused by differential thermal expansions. > > Carl Van Wormer > Cipher Systems > 1815 NW 169th Place, Suite 5010 > Beaverton, OR 97006 > Phone (503)-617-7447 Fax (503)-617-6550 > > -----Original Message----- > From: Ken Carlile [mailto:[log in to unmask]] > Sent: Tuesday, April 23, 2002 9:12 PM > To: [log in to unmask] > 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 > ---------------------------------------------------------------------------- > ----- > > --------------------------------------------------------------------------------- > 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 > ---------------------------------------------------------------------------------