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June 1998

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Subject:
From:
Ed Holton <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 26 Jun 1998 09:15:44 -0400
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This works great with an alcohol based flux, because the thermal fax paper
is sensitive to alcohol.  I have not had success with this with the water
based flux, the thermal paper did not absorb the water and the results were
inconclusive, because the flux just beaded up!




[log in to unmask] on 06/26/98 08:48:52 AM

Please respond to [log in to unmask]; Please respond to [log in to unmask]

To:   [log in to unmask]
cc:    (bcc: Ed Holton/Hella North America Inc.)
Subject:  Re: [TN] dross in the solder pot




Check your flux deposition and spray pattern.

I periodically see this with insufficient flux, when the fluxer needs
maintenance, or if all the flux burns off in the chip wave.

Use fax paper on the bottom of a PCB to analyze your spray pattern for
spray issues.

ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 6/25/98 4:19 PM:
To: Aric Parr@01635@Lectron_RH,
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG]

Experts, I am currently getting alot of failures at my functional tester.
At my post solder station, I am noticing strings of dross across the pins
of connectors.  We are having to dedross the pot daily....for a no-clean
process and inerted atmosphering, I think this is a bit extreme.  Once, an
operator managed to accidently put stencil cleaner in the flux....could
this cause a reaction unable to be corrected without dumping the pot and
cause excess dross.  I initially thought we had too much exhaust drawing
all nitrogen away from the wave.  Our flux manufacturer did analyis and has
determined that it's not the residues left which is causing my bridges at
functional.  Is a type 'C' solder analysis going to tell me anything of
significance to my problem from any of your experiences?  Any
suggestions????

Jason Smith
Process Materials Engineer
Lexmark Electronics

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