EL Cap _ Missing & Shifted out of the Copper Pad

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Hi Folk, i am wondering why they are Missing ELCap and EL... - Jul 20, 2006 by

Hi CKH, Here's some things to consider: 1) Moved by ob... - Jul 21, 2006 by Rob

Thanks You for your Valuable Advice. i really appreciate tha... - Jul 21, 2006 by

You are welcome. Let us know what the problem was if you ... - Jul 21, 2006 by Rob

these components generally have flattened through hole leads... - Jul 21, 2006 by RDR

CKH

#42848

EL Cap _ Missing & Shifted out of the Copper Pad | 20 July, 2006

Hi Folk,

i am wondering why they are Missing ELCap and ELCap being totally shifted out of the PCB Copper Pad during the SMT Reflow. Recently we have encountered some boards with the above mentioned symptoms. Appreciate if anyone could advise me.

Thks & Rdgs CKH

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Rob

#42854

EL Cap _ Missing & Shifted out of the Copper Pad | 21 July, 2006

Hi CKH,

Here's some things to consider:

1) Moved by obstruction in/entering oven, such as nitrogen skirts 2) Incorrect air pressure/air leak in oven (large surface area on component) 3) Reflow temperature too hot & electrolyte/air in cap is expanding and poping - profile oven & check against manufacturers Peak Bidy Temperature & duration; check capacitor at the base to see if the can has lifted off of the plug. 4) Vibration on chain/belt either in oven or transferring into oven 5) Displacement during component placement - move this part to the last part placed & see if that makes a difference. 6) Check paste deposit after printing to check adequate paste to anchor component prior ro reflow.

Good luck,

Rob.

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CKH

#42856

EL Cap _ Missing & Shifted out of the Copper Pad | 21 July, 2006

Thanks You for your Valuable Advice. i really appreciate that.

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Rob

#42860

EL Cap _ Missing & Shifted out of the Copper Pad | 21 July, 2006

You are welcome.

Let us know what the problem was if you find it.

Best regards,

Rob.

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RDR

#42863

EL Cap _ Missing & Shifted out of the Copper Pad | 21 July, 2006

these components generally have flattened through hole leads that have been formed for SMT, I have found that they do not sit well on PCBs. They rock, the leads are sometimes angled, etc.... In addition to Robs good advice you may want to just be sure that they are on pads correctly right before the reflow, we find that most or at least some of them usually require some nudging to get back onto pad.

Russ

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