Hi Leif
You do not say how long that connector is and what the connector body material is.
My guess on very skimpy info is that you have a too long connector made with an unsuitable connector body material, with connector pins made of some connector pin metal, like BeCu, that while it is a good connector pin material with good spring characteristcs, it makes for bad solder joints

Werner


 


 

-----Original Message-----
From: Leif Erik Laerum <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, 15 May 2009 5:16 pm
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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