Hi Joe:
                 It could be several things. Like you say, there may not
be a way for the air to evacuate from the connector side because it is
plugged up and the solder can not displace the air so it does not travel
up the THT. Preheating the board and immediately sending them through
the wave solder helps. In addition, touch up the leads that are
connected to ground planes by hand using a high thermal transfer tip.
Another, very unlikely cause, may be that you have solder ability
problems with the barrels.
        Regards,
        Ramon 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Joseph E (US
SSA)
Sent: Monday, November 14, 2005 1:16 PM
To: [log in to unmask]
Subject: Re: [TN] Agilent 5DX Service

MIL-C-38999 covers the round connectors that stick out of the front of
our boxes and let them communicate with the airplane.  The outer metal
shells are olive drab iridite over cad plate, and they mate together
with a twist/lock collar.

When the suspect solder joint was touched with an iron and some Soder
Wick, the whole thing disappeared.  There appeared to be good wetting to
the lead and the pad, but very little flow up into the barrel.  Sorry, I
don't have a picture.

-Joe

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, November 14, 2005 12:46 PM
To: [log in to unmask]; Kane, Joseph E (US SSA)
Subject: RE: [TN] Agilent 5DX Service


I am not familiar with the P/N 38999 connector yet you speak of a spacer
which stirs the mind.   Can you share a photo of the animal you are
talking about and the spacer application with vertical fill anomaly.

Victor, 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Joseph E (US
SSA)
Sent: Monday, November 14, 2005 10:47 AM
To: [log in to unmask]
Subject: [TN] Agilent 5DX Service

One of our boards has a number of 38999 connectors, with connections on
the top side hidden by a spacer.  We've had one SJ failure because 
of inadequate solder fill up through the PTH.  We'd like to determine 
whether this is an isolated problem, or whether the spacer might be
impeding solder flow.  Of course, we don't have any boards to sacrifice,
and we can't see anything with direct transmission x-ray because the 
connector is in the way.

Anyone know of a lab somewhere nearby that offers scan beam 
laminography service?

Joe Kane
BAE Systems
Johnson City, NY

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