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Date: | Thu, 21 Nov 1996 17:39:24 -0600 |
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In J-STD-001A, Appendix D, Paragraph D-4.3 Level 2 tests, the following
statement is made:
"These tests are based on the IPC Cleaning and Cleanliness Test Protocol,
Phase 3, Water Soluble Fluxes, Part II, IPC-B-36 Testing."
Is there an IPC document number for this referenced document or test
report? Where can I get a copy?
I'd like to learn more about the background of level two testing. I
don't know if I am alone, but I find the description of level 2 tests in
Appendix D hard to follow, especially with respect to pre-test
preparation steps for PTH and manual soldering technology - steps which
prepare the IPC-B-36 SMT test vehicle for PTH or manual soldering tests.
Somehow these pre-test preparation steps all fit in with the pre-test
preparation procedures outlined in IPC-TR-580 but the text is confusing.
I assume that controls, irrespective of soldering technology, are just
pre-cleaned bare boards. Is this correct? Appendix D states that control
boards shall not be processed beyond pre-test preparation. The pre-test
preparations for PTH and manual soldering include mounting of components.
Appendix D also states components shall not be mounted on control
assemblies.
A picture is worth a thousand words - and in this case Appendix D would
be much simpler to follow if it included flow diagrams showing the
preparation and processing steps for each soldering technology and for
the control boards.
I notice that J-STD-001A Appendix D requires SIR testing on uncoated
assemblies while MIL-STD-2000A Appendix D requires SIR testing on
conformally coated assemblies. Why the difference? Which approach makes
the most sense if your goal is to verify a process which includes
conformal coating?
Thanks in advance for your input.
Mary Davis
Sr. Material & Process Engineer
Alliant Techsystems
206-356-3311
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