Solder balls on gold pad

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Hi, Anybody with a solution on solder balls on gold pad. I h... - Jul 17, 2002 by computer

Search the fine SMTnet Archives to get started. ... - Jul 17, 2002 by davef

DaveF is correct in directing you to the archives. This prob... - Jul 17, 2002 by dragonslayr

Thks for the advise. ... - Jul 18, 2002 by computer

computer

#20728

Solder balls on gold pad | 17 July, 2002

Hi, Anybody with a solution on solder balls on gold pad. I have tried the following a) Check cleanliness of solder paste printing area b) Clean stencils on 1 clean per 2 prints c) Use N2 on the reflow oven. Any other methods...

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davef

#20730

Solder balls on gold pad | 17 July, 2002

Search the fine SMTnet Archives to get started.

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dragonslayr

#20737

Solder balls on gold pad | 17 July, 2002

DaveF is correct in directing you to the archives. This problem type has been discussed many times, it is quite common. Questions to ask yourself and provide us with answers are:

It always happens or random? All assemblies or just one? solder paste control? do you have one? how long is the paste exposed to air before reflow? water soluble or no- clean paste? is the reflow profile optimized for the paste and assembly? do you use aperture reduction for your stencils? the list goes on- search the archives for other possible clues

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computer

#20743

Solder balls on gold pad | 18 July, 2002

Thks for the advise.

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