Thanks for the replies.
The PWA must meet IPC class 2 and we typically require class 3 on the
PWB. This PWA goes into a piece of analytical equipment that can be
used in a dusty environment, but the assembly would rarely be removed
from its connector. The current finish is hot air leveled Sn/Pb.
I could clear a strip 0.28 ", 0.51" or 1", by removing varying amounts
of components near the edge connector but I have concerns about current
damage and am unsure of the current involved.
This could be a job for brush plating. I guess the good thing is there
are only 25 of them.
Gary Camac
Senior Manufacturing Engineer
DICKEY-john Corp.
5200 Dickey John Road
Auburn, IL 62616-0010
Telephone 217-438-2288
[log in to unmask]
________________________________
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, April 03, 2009 12:07 PM
To: [log in to unmask]; [log in to unmask]; Gary Camac
Subject: Re: [TN] Edge connector repair
Gary, in addition to the question below on present surface finish are
several more (sorry for the "it depends" answer on a Friday)
1. What spec do the final boards have to meet for your use? Do they
have to be restored to IPC Class 3, or can they be "will work in the
intended application for say two years"
2. You say assemblies - is there any space between the components there
now and the edge connector area. I am driving at the ability to apply a
temporary bus-bar for electroplating current so all fingers can be
corrected at once (the way the fingers should have been built when the
bare board was fabricated.) The bus-bar electrically connecting all the
fingers is removed late in the bard board manufacturing cycle.
3. If you could apply a temporary bus bar, would that current damage
some sensitive devices on the board? That is presuming that any
chemical fumes could also be prevented through masking or bagging the
balance of the assembly
4. Most likely, you will now have to apply the nickel/gold finger by
finger through a technique called brush plating - applying a grounding
probe to each finger and then using an electrified brush (sponge?) to
each finger. That sponge contains a bit of nickel or gold plating
solution liquid that adds the metal where reduction potential exists.
There are many repair services that can do this, but one finger repair
is much more common than correcting all the fingers. Also, this
technique would be hard to certify to a rigid spec like Class 3.
Hope this helps
Denny Fritz - MacDermid, Inc.
-----Original Message-----
From: James Mahoney <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, 3 Apr 2009 12:43 pm
Subject: Re: [TN] Edge connector repair
What's the surface finish you are dealing with? Some hard gold plating
lines
could handle assembled boards depends on the board configuration. I
would
think removing the current surface finish will be the biggest challenge.
Please update your contact for Jim Mahoney
[log in to unmask]
Thank you,
Jim Mahoney
Quick Turn Flex Circuits, LLC
Applications Project Manager
P# 603-821-6571
F# 603-821-5723
M# 603-305-6250
-----Original Message-----
From: TechNet [mailto:[log in to unmask] <mailto:[log in to unmask]> ] On
Behalf Of Gary Camac
Sent: Friday, April 03, 2009 12:39 PM
To: [log in to unmask]
Subject: [TN] Edge connector repair
Good morning all,
Here's the scenario - I have assemblies that should have Ni/Au plating
on edge connector but don't; the assemblies are built; can repairs be
made?
Thanks in advance,
Gary Camac
Senior Manufacturing Engineer
DICKEY-john Corp.
5200 Dickey John Road
Auburn, IL 62616-0010
Telephone 217-438-2288
[log in to unmask]
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