Electronics Forum: misalignment (Page 1 of 29)

SMT transformer misalignment

Electronics Forum | Mon Apr 26 09:18:15 EDT 2010 | sudhir14

Hi, friends Need your urgent help on bellow issue ....... we are facing issue of misalign of one bulky SMT transformer during the placement itself rejection @40% & after reflow rejection @5 % using SMT m/c QP242 , placing this component at end of al

D-Pak misalignment Problem

Electronics Forum | Thu Dec 02 23:43:23 EST 1999 | Kantesh Doss

We have a serious misalignment problem of D-Pak components (Specifically Motorola's part number MJD-3055/MJD-2955)following reflow soldering process. We are using Alpha Metals UP78 solder paste. Our reflow oven is Nitrogen inerted and our oxygen leve

Re: D-Pak misalignment Problem

Electronics Forum | Fri Dec 03 18:01:56 EST 1999 | M Cox

Usually the alignment problem comes from pad design. The ground pad (largest) is too small. If that is the case (and even if it isn't) try placing a dot of SMT adhesive before placement (it will cure before reflow and hold the part in place). Goo

SMT transformer misalignment

Electronics Forum | Sat May 08 07:03:31 EDT 2010 | aj

From looking at your images I would say it could be poor solderability on the terminations of the component itself. Can you get your hands on a different date code and try them out?

Re: D-Pak misalignment Problem

Electronics Forum | Sat Dec 04 09:42:18 EST 1999 | Chris McDonald

Just as explained in a follow-up you are getting too much paste on the pad. The pad is probably the right size but you cant have your aperature the same size as your pad. What we have done is put a Cross in the stencil. This will reduce the paste and

SMT transformer misalignment

Electronics Forum | Fri Apr 30 00:20:33 EDT 2010 | sudhir14

We are using QP fuzi m/c during the placement of comp. PCB is fixed & placement head is movable This component is placed at last but still we are getting the problem Comp. is placed with slowest setting also slowest comp. transfer speed of nozzle h

SMT transformer misalignment

Electronics Forum | Fri Apr 30 07:39:54 EDT 2010 | jdengler

We do a similar part on a Fuji IP3. Set table speed to low. I do not know the QP, but if it's similar to the IP make sure the board clamp/unclamp is smooth. On our IP it got dirty and was jerking causing the board to jump a little which bounced ou

SMT transformer misalignment

Electronics Forum | Sun May 02 11:36:27 EDT 2010 | jdeluna

I do agree with Jerry: you should apply more paste on it, either with a step stencil, or doing overprint on it by, let's say 120% on Transformer's pad. Also, you need to check : a) there's smooth movement on transport process after the placement, no

Re: D-Pak misalignment Problem

Electronics Forum | Mon Dec 06 17:50:39 EST 1999 | Kantesh Doss

Christopher: Thank you for sharing your experience about the DPAK. Yes, out part has a heat sink at the bottom. Our stencil opening was 7 mils (in both X and Y) smaller than the pad size excepting that the stencil opening consisted of a series of zeb

Re: D-Pak misalignment Problem

Electronics Forum | Sat Dec 04 09:23:20 EST 1999 | Christopher Lampron

Kantesh, Does this particular part have a heat sink across the bottom side of the component and does your pad size and stencil aperture match the component? I have just had a very similar problem with a DPAK. What we found was that the recomended pad

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