Graham,
I don't have a copy of GR 78, but cleaning solvents are normally not used to
remove flux residues from SIR patterns. The patterns are designed with
spacing such that the "relatively benign" R or RMA flux residues on the
termination pads will not influence the test results. I don't recall if the
following is in the procedure, but it is good practice to place a suitable
shield over the SIR comb patterns to protect them from flux splatters during
the soldering operation. Flux particles in this area can affect the test
results.
Don Vischulis
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Graham Naisbitt
Sent: Tuesday, September 10, 2002 7:53 AM
To: [log in to unmask]
Subject: [TN] SIR Testing issue
Hello Techies
I do hope you can help with this one:
I have a board fabricator who is testing to GR-78-CORE Issue 1 September
1997.
In section 14.4.3 - Terminating Test Patterns that are hand soldered using R
or RMA flux.
It states: "do not remove flux."
His questions: Why? Also, how does he do this as this (flux residues) will
influence his test results?
So, anyone care to answer....Doug, put that Mountain Dew down for just a
moment... MoonMan, is this covered in your book....Steve, can't use your new
toy for this soldering job...
Regards, Graham Naisbitt
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