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From [log in to unmask] Fri Apr 4 09: |
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>From the EMPF HelpLine; prepared by Tim Crawford
James,
I have never heard of this problem before and I seriously doubt that the
air knives are the problem. Even if (and I do mean IF) the air was
generating static it should not discharge if all handling procedures are
correct. It should be a simple check though. Test the boards for ESD
damage before cleaning, then again after clean and see what happens.
>----------
>>From: [log in to unmask]
>>Date: Thu, 03 Apr 97 08:01:05 PST
>>To: [log in to unmask]
>>Subject: ESD damage to gas fet during the cleaning process
>>
>>Has anyone experienced damage to component on circuit boards that have
>>gone through a water cleaning system. We have a number of fets on a
>>board that have been damaged at our board supplier during assembly.
>>The fets during testing have shown damage with as little as 20 volts.
>>The Electrical Engineering guys in our company think the damage might
>>be caused at the exit end of the water cleaning system by the air
>>knife that is drying the board. They have asked our assembly house to
>>investigate the addition of an air ionizer inline with the air knife,
>>to eliminate the possibility of creating a static charge during this
>>process. The cost to do this is $20K, I could use a little help if
>>its out there to convince them this is not required. My contention
>>is the assembly house which never handled this sensetive of a
>>component before has a handling problem which they have addressed and
>>corrected. but the EE guys here still want them to address the
>>airknife situation on the cleaning system
***ALL NEW EMPF PHONE NUMBERS***
Jack Crawford, HelpLine Coordinator
Electronics Mfg. Productivity Facility
****NEW--317.655.3688
****FAX 317-655-3699
714 N Senate Ave, Suite 100
Indianapolis IN 46202-3112
VISIT OUR HOME PAGE AT: http://www.empf.org
[log in to unmask]
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