All
Well here it is! my monthly poser for the forum.
This is one that has come back to haunt me a little, in my first few weeks with my current employer i was asked to look at a Small gating circuit with a production 'eye'.
I was unhappy about several of the design features and said so.....but being 'johnny come lately' was largely ignored.
So....we have a board 28mm x 9mm x 0.9mm, populated both sides with 0805's, 0603's, SOT23's and a ceramic cap 2220.
guess what the problem is??? yep the LARGE cap

Cte mismatch between the ceramic and the FR4 in my opinion is too much.....agree/disagree?
The component has one pad running parallel with the long side of the PCB 2mm inboard. The other pad runs parallel with the other long side of the PCB....0.6mm inboard.
The boards (50 to a panel) are populated, reflowed both sides and then cut out using a circular cutter.
Pad distance from edge and likely vibration damage are surely wrong...agree/disagree???
Any other possible problems or areas of note would also be appreciated as design are still refusing to accept any of this (assuming i am on the right track), hard evidence or IPC related docs would be appreciated.
Meanwhile we have a line stoppage and our subcontractor is being blamed for poor manufacture. Anyone want to fight their corner with me???


Regards
Ian Squires
Senior Production Engineer
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Graseby Dynamics Ltd
A Smiths Industries Company
Park Avenue, Bushey, Watford, Herts, WD2 2BW
Web Site: www.gradyn.co.uk
Phone:    01923-228566 xt 295
Fax:      01923-221361
E-mail:   [log in to unmask]

Registered in England no. 480992
Registered office:
765 Finchley Road, London, NW11 8DS
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