Ken,
Yes, WS cleaning is easy but you need to do it. Again, try the water pick
followed by an air gun.
I have seen voltage regulator set points in error due to leakage.
As for the no cleans I have heard that "Incomplete Heating" does not "Fix"
some no cleans, but perhaps that applies only to SMT Paste flux, I don't
know. This is kind of a witch hunt area and everyone has their own
definitions of "Bad Witches".
Bob Kondner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
Sent: Tuesday, September 07, 2010 9:46 AM
To: [log in to unmask]
Subject: Re: [TN] Hand Soldering
Thanks for all your help folks.
I've used the water soluable in the past with good cleaning results but you
really had to make sure you got it all off.
The flux seemed to have conductive properties and on one particular project,
caused a small surface current between an xtal pin and its surrounding GND
plane.
This in turn de-tuned the circuit...took us a while to figure it out :)
Scraped the flux away and the circuit worked...
Ken
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Tuesday, September 07, 2010 9:14 AM
To: [log in to unmask]
Subject: Re: [TN] Hand Soldering
Ohhhh, I beg to differ. Water soluble fluxes are more active and will
probably do OK for soldering, but they also represent a danger if you do
not totally remove them or if some of it flows into places and does not
get rinsed out. What really makes me nervous about your approach is your
choice of equipment and cleaners. Tap water sucks as a cleaner and hot tap
water only slightly better. You might be able to remove the visible
residues, but will still have invisible residues that will cause problems.
In some cases, you are putting on more contaminants with the tap water
than you are removing.
We use low residue fluxes here on class three product and have a number of
cases where the the residues are left in place. It is simply a matter of
finding a flux and cleaning combination that works well together, and
limiting the amount of additional flux you add. A skilled operator can do
soldering with no more flux than is in the core of the wire. You may need
a slightly larger core.
Ken, I would suggest this short list to you. Use either Kester 245 low
residue flux (P3 core) or Alpha Telecore Plus (also P3 core). Both are
standards here and work well for soldering. For topical cleaning
solutions, try Kyzen's Cybersolv 141b or Chemtronics Flux-Off Heavy Duty.
Both these cleaning agents work well with the fluxes I named.
Doug Pauls
Rockwell Collins
Robert Kondner <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
09/06/2010 01:27 PM
Please respond to
[log in to unmask]
To
[log in to unmask]
cc
Subject
Re: [TN] Hand Soldering
Ken,
In my mind there is absolutely no question, hand assemble using Water
Soluble flux. A good spray under hot water cleans well.
During final assembly or rework I might use a no clean at spots. The only
problem is the no clean is VERY DIFFICULT to remove so don't try. It
detracts from board appearance.
It the spot being reworked is a sensitive analog circuit they rework
using
Water Soluble. For anything close to fine pitch SMT you should be applying
liberal quantities of Water Soluble flux, only way to rework.
You can get a little "Water Pick" real cheap. Load it with hot water and
you can you can really get down into the nooks and crannies.
Bob Kondner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
Sent: Monday, September 06, 2010 8:30 AM
To: [log in to unmask]
Subject: [TN] Hand Soldering
Hi all.
What is the best setup for hand soldering as far as solder / cleaner?
Rosin core? Water soluble? No-Clean?
What cleaner too?
I've been using rosin core with various cleaners but I have a hard time
with
the white residue the cleaners leave.
Thanks
Ken
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