Electronics Forum: causes of missing end cap (Page 1 of 2)

DFM of a unique polarized cap

Electronics Forum | Thu Jul 01 20:47:48 EDT 1999 | Scott McKee

I called a new customer today and told him that one of his parts on the proto boards (a capacitor with a polarity 'tit') was too long for the pads and the pads were small causing the end opposite of the "tit" to lift up. I suggested that the product

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 09:53:40 EDT 1999 | lwk

| | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | Most common reason is uneven heating where

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 15:47:25 EDT 1999 | JohnW

| | | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | | | Most common reason is uneven hea

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 16:42:32 EDT 1999 | Dave

| | | | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | | | | | Most common reason is

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 21:44:03 EDT 1999 | Jason Tomlinson

| | | | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | | | | | Most common reason is

Masking of PWBs prior to conformal coat

Electronics Forum | Fri Apr 21 17:46:29 EDT 2006 | SD

First of all, do not use kapton tape! It tends to cause a dewetting effect around the tape. A call to Humiseal will explain why. There's not really a blanket answer to your question.... Removing cured liquid mask can often result in a fillet ef

Re: Film Capacitors - Tombstoning or Drawbridging Problems

Electronics Forum | Mon Mar 30 07:44:12 EST 1998 | Earl Moon

| | | | | We are having some problems with "drawbridging" on 0805 film capacitors. | | | | We have already reduced the pad width from .050" to .040" based on input | | | | from vendor. Defects appear to be random as far as location on the PWB and d

Re: Film Capacitors - Tombstoning or Drawbridging Problems

Electronics Forum | Sun Mar 29 15:42:05 EST 1998 | Michael Fogel

| | | We are having some problems with "drawbridging" on 0805 film capacitors. | | | We have already reduced the pad width from .050" to .040" based on input | | | from vendor. Defects appear to be random as far as location on the PWB and direction

Re: Cylindrical diodes Missing during SMT process.

Electronics Forum | Tue Aug 24 05:11:32 EDT 1999 | George Verboven

| | Hello everyone, | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | |

Re: Cylindrical diodes Missing during SMT process.

Electronics Forum | Tue Aug 24 06:40:18 EDT 1999 | Gyver

| | | Hello everyone, | | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. |

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