Hi Randy,
I like all the suggestions made so far but want to remind you that the intent was to connect the chassis to the board ground, so a non-oxidizing surface finish is required when the repair is completed.
In my experience, I have used a microblaster, soldering irons, and eraser processes to do this, and each has pros and cons.
A skilled operator can take off the soldermask using a dremel tool with a rubber tip (or buffing pad) very efficiently.
No matter what the method for removal, pretin the exposed copper.
The resultant surface needs to be wicked off using copper braid so that it is as flat as the other pads.
Hope this helps,
Phil
"Randy Bock Sr." <[log in to unmask]> wrote:
Thank you I will keep that one as an option. The fab house is over seas
so we are looking to more locally domestic sources.
Randy Bock Sr.
Quality Engineer
Pitney Bowes
AddressRight Printers
(email) [log in to unmask]
Newtown Building 2
203 270-4931 Ext
8-426-4931 In
203 270-4982 Fax
Steve Hodge
Sent by: TechNet
11/11/2005 08:56 AM
Please respond to
TechNet E-Mail Forum ; Please respond to
Steve Hodge
To
[log in to unmask]
cc
Subject
Re: [TN]
Re: [TN] Solder Mask Removal
It certainly would make most sense to send the unpopulated boards back to
the board house for rework. However, if the product was not built
domestically, the freight back and forth would more than offset the rework
costs if done locally. I have heard that a rubber or soft plastic mask and
a soda blaster works well for a problem mask removal such as Randy's. FWIW
At 05:44 AM 11/11/2005, you wrote:
>Why should you fix it if the fab house made the mistake? Make the fab
>house fix it ASAP. If they won't fix it, bill them back for your time
>to repair. And the harshest solution would be to find a new fab house.
>
>But if all else fails, Richard's solution sounds like the most
>repeatable with the least sloppy damage to the board.
>
>Phil
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Randy Bock Sr.
>Sent: Thursday, November 10, 2005 2:53 PM
>To: [log in to unmask]
>Subject: [TN] Solder Mask Removal
>
>Hey y'all,
>
>We have several hundred boards that are supposed to have the solder
>mask
>removed for around a mounting hole on the back side of the board. The
>fab house missed. We are faced with a total remake if I cannot find
>some
>way to remove the solder mask relatively easy. Most are still fab
>boards,
> but I do have some that are assembled.
>
>Any ideas would be appreciated. The clear area has to be approx 1/2 "
>dia. (is for grounding)
>
>Randy Bock Sr.
>Quality Engineer
>Pitney Bowes
>AddressRight Printers
>(email) [log in to unmask]
>Newtown Building 2
>203 270-4931 Ext
> 8-426-4931 In
>203 270-4982 Fax
>
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