Hi Adil,
I need to know more to say anything:
Where are your pin-holes located: On the leads or on the solder fillet
surface? What do you mean by "component film"? Have you checked the leads of
your components before soldering? Are you soldering PTH or SMD components in
the wave?
Best regards,
Thomas Ahrens
[log in to unmask]
-----Ursprüngliche Nachricht-----
Von: Adil Nasir <[log in to unmask]>
An: [log in to unmask] <[log in to unmask]>
Datum: Donnerstag, 10. August 2000 17:31
Betreff: [TN] Pin-holes
>Hi,
>We have been having some problesm with pinholes and they don't seem
>to go away. We've tried different boards, different components,
>checked the RH in the facility, checked the oven profiles.
>Still we have not been able to determine the root cause of the
>problem. The experiments point towards a few components, but
>we're not sure as the problem is widespread over all components.
>
>I would assume the problem is with an organic film forming on the
>component film which results in outgassing during wave-solder.
>Now how this film gets onto the leads is unclear, is from the
>manufacturing process from the component vendor, or is it from
>our process in house.
>
>Would moisture be a major contributor to this problem. The air
>we have actually is very dry running at around 40-50% RH.
>
>Could we anticipate a problem with the quality of the Solder paste
>from our vendor. Although we have tried different solder pastes
>and we have the same results.
>
>Anybody out there with experience with pinholes.
>
>AN.
>
>
>>From: "Dieselberg, Ron" <[log in to unmask]>
>>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>, "Dieselberg,
>>Ron" <[log in to unmask]>
>>To: [log in to unmask]
>>Subject: Re: [TN] Blow Holes
>>Date: Thu, 10 Aug 2000 06:32:12 -0400
>>
>>Yes, Cara, if the board has not been properly cleaned and baked prior to
>>assembly you will get blow holes! Check the holes, (assume PTH) with a
good
>>high power stereo microscope, for foreign material. Taping a small ball
>>bearing to the backside of the board and viewing into the topside of the
>>hole will give you a "fish eye" view of the entire barrel. If you find
>>"crud" in the holes determine what the material is and clean it out.
(After
>>solvent cleaning blow dry the holes with dry Nitrogen.) It works for us
:-)
>>
>>Ron Dieselberg
>>BAE SYSTEMS
>>Cincinnati Electronics Corp.
>>
>>-----Original Message-----
>>From: Cara.Startek [mailto:[log in to unmask]]
>>Sent: Wednesday, August 09, 2000 14:52
>>To: [log in to unmask]
>>Subject: [TN] Blow Holes
>>
>>
>>I'm having a problem with blow holes occurring in a thick board that I'm
>>running on a wave solder machine. As a test I am going to bake the boards
>>for 24hrs to remove moisture from the board and eliminate this as a cause
>>of
>>the problem. Is there any thing else that cold be causing blow holes?
>>
>>Cara Startek
>>
>>Process Engineering
>>http://www.leitch.com
>>
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