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April 2003

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Subject:
Re: Soldermask inspection question
From:
Tim Reeves <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 24 Apr 2003 11:42:38 -0700
Content-Type:
text/plain
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text/plain (39 lines) 
You're right the IPC specs leave it open. However, you can reasonably reject boards with excessive touch-up, and the fabricator will understand that other shops can do a better job, and they need to correct the root cause. The root cause is a good question to answer BTW. If the mask got scratched off by the HASL air knives it's one thing, but if it's flaking due to bad surface prep before mask, it's another. You could reject in both cases, but the latter is more justified (IMHO)
Tim Reeves

-----Original Message-----
From: Mark Hargreaves [mailto:[log in to unmask]]
Sent: Wednesday, April 23, 2003 12:48 PM
Subject: Soldermask inspection question


Hi All,
Does IPC-6012 or IPC-SM-840 limit the size, number or location of soldermask
touch up spots allowed per board?  From what I've read, it seems that any
amount of touch up is allowable.

Thanks,
Mark

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