HOT-BAR systems are notoriously difficult to set up. Co-planarity between the board surface and the HOT-BAR is very important and can be difficult to achieve. You can't get there by just pressing harder because it is also important to control the pressure on each contact. If planarity is perfect, then look to solder deposition regularity and fluxing problems (insulation resistance problems are often flux related).
With respect to PCB design, the pad width is an important parameter you can vary.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tony Liu
Sent: Thursday, July 08, 2010 10:49 AM
To: [log in to unmask]
Subject: [TN] SFF-8087 PCB (Also call Min SAS)---Really need you help
Hi,
I need you help,appreciate you if you can give some useful suggestion
Now a product that called Mini SAS is making in my compay,it is a cable
assembly, consist by two PCB ,36 way wires,heat shrink
tubing,innermold,overmold,etc.The wire diagram is one to one,two ends are
36PIN PCB.
The PCB is 36 PIN(18PIN in each surface) and the pitch between each pad are
very small, PCB pad width is 0.6mm and the pitch is 0.8mm,the operator weld
the conduct of wires to PCB pad by HOT-BAR(auto welding maching),
the key problem is after welding and testing there have many badness goods
be made,like as short,open,insulation resistance is very small between each
pin(<1M Ohm),just low than 70% goods could be passed test.
Pls give your prefessional advice how to solve this problem,for instance
PCB designing improve?
Sn component imrpove?
Welding machine parameter?
http://www.google.com.hk/images?hl=zh-CN&q=MINI%20SAS%20PCB&um=1&ie=UTF-&source=og&sa=N&tab=wi
(This web link to MINI SAS 36PIN products,FYI)
Thank you!
Tony Liu
Sales Department
Mobile:13048936174
18926869763
Tel： 0769-22810730
Fax：0769-22810732
Email:[log in to unmask]
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