Hi, Leif
A picture would help. Send it to Steve Gregory.
[log in to unmask]
Right now on Monday morning we are quite ready to help someone with a
less scientific question.
 
Anything except ESD charges on insulators. 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leif Erik Laerum
Sent: Friday, May 15, 2009 4:17 PM
To: [log in to unmask]
Subject: [TN] Connector with loose pins

Technetters,

I have a less scientific question, but I hope someone has some 
experience with a similar problem.

We have a .090 think motherboard where one particular part number 
connector frequently have loose pins. It is 33 cm by 16mm. There are 
lots of other types of connectors on the board that does not have 
issues. We only have problem with one part number. These connectors are 
at the very front of the board. They go in the oven first. This is a 
leaded solder board and we use SN63/Pb37 solder. The loose pins tend to 
be at the end of the connector and on power planes. On some boards it 
appears that the connector sort of twists or bows a little bit.

The problem is that this surface mount connector is very hard to fix. 
The pins frequently short and due to space limitations, it is hard to 
reach them with the tip of the soldering iron. They also tend to develop

shorts easy. This makes it even harder to fix after reflow.

We have tried reducing the cooling at the end. We have sent the boards 
through the oven with the mate installed in order to stiffen up the 
connector. The profile was checked as late as today. Nothing jumped out 
at me.

Does anyone have experience with a similar problem that they managed to 
solve?

Thank you.

-- 
Leif Erik Laerum

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