Hello,
While Steve had your attention to his "Snake Board", what is the likely
casue on my soldermask problems?
Thanks and regards,
Wee Mei
Steve Gregory wrote:
>Hi All!
>
>Back on January 6, Wee Mei had asked me to post some pictures for him, and
>then he posted the question below.
>
>Well, I've been gone since the beginning of the week (up in nice, warm,
>Burlington, Ontario Canada), and am just now getting around to posting his pictures
>for him. You can see the pictures at: http://www.stevezeva.homestead.com
>and look at "soldermask 1-3"
>
>-Steve Gregory-
>
>
>
>>----- Original Message -----
>>From: "Lum Wee Mei" <[log in to unmask]>
>>To: <[log in to unmask]>
>>Sent: Tuesday, January 06, 2004 1:45 AM
>>Subject: [TN] Solder Mask Defects - What casue it.
>>
>>
>>
>>
>>>Hello,
>>>
>>>I have asked Steve to download the picture at his site. Once it ready,
>>>can someone take a look and give me your opinion what is the likely cause.
>>>
>>>Background : The board was partially mounted previously. It come back
>>>to mount the remaining 6 chips. The board was washed as per normal with
>>>Ensolv and assembled immediately. As the operator solder the chip, she
>>>noticed scale-like defects appearing on the soldemask around the whole
>>>stretch of the solder pads. The defects are more prominent on the left
>>>side compare to right of the chip. This is repeated for the rest of the
>>>5 chips.
>>>
>>>Being naughty, she touched the board surface with the soldering iron tip
>>>and found on the same spot the same defect appearing.
>>>
>>>One more information : defects found on these 2 boards have a much more
>>>rough surface compare to other pieces within the same batch.
>>>
>>>How the information is sufficent for you to provide opinions.
>>>
>>>Thanks and regards,
>>>Wee Mei
>>>
>>>
>
>
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Search the archives of previous posts at: http://listserv.ipc.org/archives
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