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October 2001

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Subject:
From:
"Crepeau, Phil" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 14 Aug 2001 16:52:35 -0700
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hi,

looking at the leads in the plated through holes makes me believe that these holes are too big for the leads.  if the holes weren't this big, i doubt that you'd need special tooling to prevent a misalignment problem.

phil

-----Original Message-----
From: Busko, Wolfgang [mailto:[log in to unmask]]
Sent: Tuesday, August 14, 2001 8:48 AM
To: [log in to unmask]
Subject: [TN] Connector tilt, acceptable or not?


Thanks Steve for your picture service !!!

To all,

I have some pictures on Steveīs page
http://stevezeva.homestead.com/index.html
<http://stevezeva.homestead.com/index.html> 

The issue is that these connectors (Teradyne 2mm pitch) adapt our boards to
a backplane and the problem is that due to this obvious shift/tilt the
danger of damaging some of the male connector pins at the backplane if not
mounting these boards with the greatest possible caution is quite probable.

The CM in this case states that according to IPC A610 chapter 5.2.9 this is
within tolerance of 0.5mm as shown and refuses any rework or refund.

The question is, does 5.2.9 apply in this case? The "not acceptable"
criteria is what the discussion is all about. With, letīs say, caution and
some extra force the insertion is possible but I see the danger of breaking
backplane connector pins especially when customer service teams try to
change boards  --( it happens from time to time and asks for a new backplane
or, if in the field, the change of the complete 19" rack)

To do the mounting of the connector properly is absolutely no problem and
has never been one until now that they changed their workflow and team for
this task.

The rework would be: Loosen the srew - attach mating connector module -
resolder over rework wave and the connector adjust automatically

We ourselves do have the "accept or not accept"-debate "now and here" and I
would like to hear what others have to say about the risks of rework
compared to the risk of damaging a more costly device.

Me no like this borderline cases, 

Wolfgang

 

 

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