Steve,
Are we talking about rework for PTH or SMT or both? Is this no-clean, OA or
RMA type chemistry? Are you talking about cored wire, solder paste, liquid
flux, paste flux or all of the above? What is(are) the solvent(s) your
operators use? If it is no-clean, do they really need to clean at all after
the rework? Is their hand cleaning that bad or is it a result of the flux,
solvent or combination you are using?
regards,
Bev Christian
Nortel
> ----------
> From: Stephen R. Gregory[SMTP:[log in to unmask]]
> Sent: Thursday, September 03, 1998 4:38 PM
> To: [log in to unmask]
> Subject: [TN] Cleanliness Experiment/Demonstration Ideas?
>
> Hi Ya'll!!!
>
> I was wondering if anybody has any good Ideas that will graphically
> show
> people the importance of proper cleaning. Let me preface this a little; I
> want
> to come up with some way that will hit home to our rework people that hand
> cleaning after touch-up doesn't cut it. There's a couple of operators that
> I
> know that aren't convinced that what they're doing is very detrimental to
> long
> term reliability, otherwise they wouldn't do it. Worse yet, their
> supervisor
> I know, thinks I'm some sort of anal retentive cleanliness freak that's
> making
> much ado about diddley.
>
> I've shared many articles about field failures due to
> electromigration
> with everyone, tried to explain the basic science behind what's happening
> when electromigration occurs, but I'm afraid I'm not making an impression
> because I still catch operators hand cleaning assemblies that should be
> going
> through the inline cleaner.
>
> I feel that if I had some sort of "show and tell" experiment that I
> could run here, and they could see with their own two eyes what goes on
> with
> the residues left from hand cleaning, might be a little more effective to
> show
> them the error of their ways better than me lecturing to them about the
> evils
> of hand cleaning an assembly.
>
> I know that there's probably a few of you thinking; "If I had an
> operator that wouldn't follow the processes I set, then hasta la vista
> baby...hit the road." Believe me, I've thought about it...but except for
> this
> one issue, they're skilled people. Something else I've thought about at
> the
> same time was something I learned in the Navy, that if you're having
> problems
> with an individual, you don't give them orders to another duty station to
> get
> rid of the problem, because you may see that individual again at your next
> duty station still with the same problems. I feel it's the same with the
> operators in question, I'd rather try to get rid of the bad habits rather
> than
> fire someone, because here in silicon valley, it's a small world when you
> work
> contract manufacturing...I just might see that operator again at the next
> company I work at.
>
> Any idea's any of you have would be most appreciated!!!
>
> -Steve Gregory-
>
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