Hi Ken,

I don't know Alpha E191/1 flux but, I doubt flux contamination would
disappear overnight.  Is it possible the assemblies are still wet and
shorting out?  How do you clean them, if it isn't a no clean system?

Hans

~~~~~~~~
Hans M. Hinners         Materials (& Process!) Engineer
Warner Robins - Air Logistics Center
Avionics Production Division/Manufacturing Branch (LYPME)
380 Second Street, Suite 104    (Building 640)
Robins AFB, GA  31098-1638
912-926-1970 (Voice) 468 - 1970 (DSN)  912-926-7974 (Fax)
[log in to unmask]

> Hi,
>
> We currently have a problem with some of our assemblies failing
> functional test due to conductance between parts of the board.
> What we notice is that there appears to be a residue on the topside
> that disappears overnight and the assembly then passes test.
> Is this a flux issue or could it be something on/in the bare PCB that
> would cause this.
> The flux we are using is Alpha E191/1 through Electrovert wave solder
> machine.
> Anybody any thoughts?
>
> Ken Robertson.
>
>

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################