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January 2012

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Subject:
From:
Karen Tellefsen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Karen Tellefsen <[log in to unmask]>
Date:
Tue, 24 Jan 2012 15:00:39 -0500
Content-Type:
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text/plain (303 lines)
10k water is pretty dirty, did you mean 100k?   How does 2 Mohm cm water
compare with 8 Mohm cm?

To be honest, I've yet to hear a plausible scientific explanation of
"hungry" water based on solubility/adsorption equilibria or kinetic theory
rather than anecdotal evidence.

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069



                                                                            
                                                                            
                                                                            
   Re: [TN] The iPhone Economy (from NY Times)--BACKGROUND FACTS & HISTORY  
   FIRST                                                                    
                                                                            
                                                                            
   Paul Edwards                                                             
                to:                                                         
                   TechNet                                                  
                                                        01/24/2012 02:02 PM 
                                                                            
                                                                            
                                                                            
                                                                            
   Sent by:                                                                 
          TechNet <[log in to unmask]>                                         
   Please respond to TechNet E-Mail Forum, Paul Edwards                 
                                                                            
                                                                            
                                                                            






2 Places...

1) I get boards that don't pass functional test when I wash at less than
10k water and pass at any thing above 8Meg (also have the same result with
GPUs)

2) Looking at composite solubility curves for city water verses DI water

Any water will wash off solublized material or "mud" because it is on the
PCB but for stuff that is attached to the PCB with an electrostatic bond
you need "more power"...

Paul

Paul Edwards
Process/Quality Engineering
Surface Art Engineering


-----Original Message-----
From: Robert Kondner [mailto:[log in to unmask]]
Sent: Tuesday, January 24, 2012 10:44 AM
To: 'TechNet E-Mail Forum'; Paul Edwards
Subject: RE: [TN] The iPhone Economy (from NY Times)--BACKGROUND FACTS &
HISTORY FIRST

Paul,

 That is a new thought. Where did that information come from?

Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Tuesday, January 24, 2012 1:23 PM
To: [log in to unmask]
Subject: Re: [TN] The iPhone Economy (from NY Times)--BACKGROUND FACTS &
HISTORY FIRST

Joyce,

Di water would be better because it more typically readily absorbs more and
weaker positively and negatively charged ionics then city water...

When the city water has been loaded with Cl and F compounds then the ionic
absorption balance changes...

Paul

Paul Edwards
Process/Quality Engineering
Surface Art Engineering

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Tuesday, January 24, 2012 8:33 AM
To: [log in to unmask]
Subject: Re: [TN] The iPhone Economy (from NY Times)--BACKGROUND FACTS &
HISTORY FIRST

Brian,
Can you kindly refresh my memory: why DI washing is better than city water?
(don't ask me why I need to know.  I just need expert voice).  Many thanks
(buy you a glass of wine when we meet).

Joyce Koo
Materials Researcher - Materials Interconnect Lab Research In Motion
Limited
Office: (519) 888-7465 79945
Mobile: (226) 220-4760


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Tuesday, January 24, 2012 11:23 AM
To: [log in to unmask]
Subject: Re: [TN] The iPhone Economy (from NY Times)--BACKGROUND FACTS &
HISTORY FIRST

I'm sorry, but I've worked in China on cleaning/drying problems and OD
solvent replacement. I can assure you that most of the numerous shops there
use exactly the same types of equipment and techniques as are used in
developed countries, sometimes even better.

Brian

On 24/01/2012 17:10, Robert Kondner wrote:
> When it comes to selecting someone to help analyze a company's processes
I
will take the "Fresh Out of School" MBA over an experienced electronic
technician any day.
>
>   When I asked about rinsing in tap water followed with a water blow off
so many folks said "Must Use DI" without even considering an analysis. A
fresh out of school MBA might think about it longer. Hmmm I think I will
pay
them more money.
>
>   What would they do in China? Put in a DI system of blow off tap water
with an air gun? Hmmm, sounds like China knows the value of a dollar!
>
> Bob K.
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Pete
> Sent: Tuesday, January 24, 2012 9:18 AM
> To: [log in to unmask]
> Subject: Re: [TN] The iPhone Economy (from NY Times)--BACKGROUND
> FACTS&  HISTORY FIRST
>
> There seems to be two types of MBAs.  Those that start with an undergrad
degree and get their MBA as they, and those that get their MBAs before
entering the real world.  The problem came in the 80's, when every company
wanted to hire those freshly minted MBAs right out of school.  About the
same time that share price became the only barometer.   So began a cycle of
formulatic answers because the textbook said so.  Profits temporarily down?
Reduce the workforce.  Wnat more profits?  Send it to China.  The MBAs with
real experience knew better, wouldn't go for the instant gratification
ideas, so they aren't the ones who got promoted to positions to make
significant business decisions.  Part of the reason American companies seem
to be stuck in a ditch is because we're now starting to see the long term
effects of short term efforts to prop up that share price.
>
> I could show rather convincingly how moving some R&D workforce to China
because they bill 1/3 is costing us twice as much, and losing us market
share.  But I don't have the right letters after my name, I don't get to go
to those meetings.
>
> Pete
>
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