Comments.If it is hardly to
modify related pcb design, stencil design should be key solution, I think
you should try to have more experiments to optimize process parameter.such
as stencil design, printing control,and reflow profile as well.
2)生产线PCB板尺寸为190x155mm,厚度有1.04mm,有1BGA尺寸偏大
30x30mm(焊点26x26),
在返修BGA台返修时,发现PCB板很容易变形,弓曲变形80%超过0.75%的标准(IPC-A-610D
10.2.7)
不知有无好的工艺方法能避免PCB板变形?
comment Is
it really 190x155mm of PCB size ? i really never see such big pcb.
因刚加入这个组织,也许之前有讨论过,还请多多包涵。
以上,非常感谢。
Thanks and Best regards,
QiXiong Liu / 刘启雄
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