Hi All

Here is another residue issue

We have an assembly which has a white residue remaining after wash.
The board is completely SMT (WS609) using a DI-Wash process,  the board is
spotless except for one location.  The location is a QFP (from CRONTEL),
the white powder is on the leads of the IC only.  There is not a spot on
the PCB.

The Powder dry brushes extremly easily. On a few of the leads ( usually
about half way up the lead, nver near the joint)after brushing there is
evidence of flux residue( yellow sort of like Crystal Flux residue) in
spots.
We have put a few boards through the Omega with readings lower then
2.3microgram/sq.inch.

Could this be something the part manufacture has left/put on the leads? I
have noticed that the plating is thin on the leads (exposed copper on the
faces) the leads also look like sheared stock ( exposed copper on the sides)

Thanks
Andre

---------------------------------------------------------------------------------
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 the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------