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January 2012

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Subject:
From:
Mike Bogden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 10 Jan 2012 05:00:19 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (148 lines)
I recieved all gibberish 

Mike B



----- Original Message ----
From: Steven Creswick <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, January 10, 2012 3:04:26 AM
Subject: Re: [TN] Cleaning water soluble flux‏

Rex,

Wow, you certainly received much less gibberish than I!  Am I the only one to 
receive total gibberish?  Meaning, something on my end?

Joyce once indicated that she was at an outside [of the plant] WiFi hotspot when 
one of hers came in garbled.

Steve C

-----Original Message-----
From: Rex Waygood [mailto:[log in to unmask]] 
Sent: Tuesday, January 10, 2012 3:58 AM
To: TechNet E-Mail Forum; Steven Creswick
Subject: RE: [TN] Cleaning water soluble flux‏

I could read most of it but part of the first line was odd.
This seems to be a problem that is occurring more often.
What do we need to do to avoid the problem? 
Rex


‰يz{S­©ى}êؤت ٹx jا؛à*'µéيO*^µىm‏™Zٹw!j» • §vŒ,×nzHi Joyce -  you can accurately 
measure the amount of moisture in a pwb using a Mettler or equivalent 4 digit 
accuracy balance. The procedure to do so must be very very controlled and 
rigidly followed. The IPC-1601 standard lists the protocol for the procedure. We 
use have used this protocol successfully for many years producing data we use in 
our production facilities on a daily basis. I would love to have 6 digit 
sensitivity for the task but that isn't always available or completely 
necessary.

On a separate note -  the cleaning debate shouldn't be about if there is water 
left on a pwa after blowing it off. As Terry and others have detailed, the real 
issue is what contaminates are left in the laminate or the soldermask after the 
tap water or cleaning solution has been removed. 

There is an immense amount of published data on the subject so there is no need 
to run another test.

Dave Hillman
Rockwell Collins
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: 10 January 2012 08:52
To: [log in to unmask]
Subject: Re: [TN] Cleaning water soluble flux‏

Dave,

Sorry, but couldn't translate your response.

Was going to suggest to Gary that lead form damage to the lamps glass seal would 
be a primary candidate for early lamp failure as someone had suggested earlier.  
All it takes is a bit of oxygen to slip in.

Can the observed difference in failure rates between RMA and the water soluble 
be that residual water soluble flux has eaten away at the Dumet lead at the 
glass to metal seal?  Dumet, being ~42Ni/58Fe 'rusts' with little additional 
assistance from acidic residues.

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Monday, January 09, 2012 10:54 PM
To: [log in to unmask]
Subject: Re: [TN] Cleaning water soluble flux‏


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