The solution may be as simple as adding a spacer under the connector to
allow for inspection.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Schaefer, Chris
Sent: Tuesday, February 28, 2006 1:02 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Joint Inspection
Section 6.3.1 speaks about a 50% vertical hole fill on sections of the
board that are considered thermal planes or conductor planes. It sounds
like this applies, but it may require something from your customer to
allow this or for reasons of stress it is required - not sure. We have
issues such as your and we have spoken with the customer and have
received the ok to allow a 50% fill versus the traditional 75%.
I agree with the previous point, but it will not allow for any process
anomalies that occur on occasion. If for some reason the connector has
issues related to the solderability, then you have a problem. In another
scenario if the area/ connector has not been proper fluxed or achieved
proper solder contact - it might look fine on the outside, but has not
achieved the solderability levels you desire.
Food for thought...
Have a nice day guys!
Chris Schaefer
Suntron Corporation
Process Engineer
540 N. Rogers Road
Olathe, Kansas 66062
913.393.5878
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of John Berg
Sent: Tuesday, February 28, 2006 12:44 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Joint Inspection
If x-ray is not an option, you need to set up a soldering process that
would not require inspection. On a thermally relieved pad that does not
get sufficient fill, you need to preheat the pad area prior to hand
soldering to compensate for the heat sinking. If you can get a dummy
populated board, preheat it to a known reference level, and then remove
the connector body to examine the % fill. Find the minimum reference
preheat that will obtain your desired % fill. If you can't get a dummy
populated board, you can use a few production boards to find the
reference preheat by utilizing an ouitside x-ray service to determine
the % fill.
>>> [log in to unmask] 2/28/2006 7:55 AM >>>
We are having a heck of a time inspecting some solder joints and could
use your help.
Per Class 3 a solder joint is supposed to have at least a 75% fill. We
have a circuit board that has large ground planes and hand soldered
connectors that are impossible to inspect for top side solder.
We do not have access to an x-ray and are wondering if there are any
clever ways to inspect these solder joints.
Thanks,
KennyB
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