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May 1998

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Subject:
Re: Solder Ball?
From:
Michael Carano <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 13 May 1998 20:41:29 -0700
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Alvin Leong wrote:
>
> Hi Technetee,
>         Anyone experience the solder ball appearing in the no-clean process?
> What is the contributor? I forseen a misprinted PCB on the solder paste
> station is one of it.
> 1. What is the recommendation on the smear board cleaning procedure?
> 2. Ultra-sonic cleaner?
> 3. What type of chemical?
> 4. If an ultra-sonic is the solution, then what is the side impact to
> the package on double-sided process?
>
> Hope anyone can share the info.
>
> Thks.
>
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> ################################################################Generally,in the no clean process, as I understand, solder balls are more
prevalent.
You can try the following to see if it helps:

1.      Lower preheat temperature
2.      Is there sufficient flux on the board?(wave solder)
3.      Soldermask: glossy or matte? The matte masks are less [prone to
solder balls.
4.      Is mask properly cured? Try an extended UV cycle to harden the
mask.

Good luck

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