Electronics Forum: before (Page 1 of 483)

Baking PCB's before Assembly

Electronics Forum | Thu Feb 24 14:58:11 EST 2000 | Greg denham

Does anyone have any information on baking boards to remove moisture before reflowing and waving assemblies? I've been told that we should do this to stop such problems as delamination of boards, blow holes, solder balls, etc. I don't know have any e

Baking PCB's before Assembly

Electronics Forum | Thu Feb 24 14:58:11 EST 2000 | Greg denham

Does anyone have any information on baking boards to remove moisture before reflowing and waving assemblies? I've been told that we should do this to stop such problems as delamination of boards, blow holes, solder balls, etc. I don't know have any e

Cleaning before Conformal Coating

Electronics Forum | Fri Sep 09 15:03:46 EDT 2005 | Amol

Hi, I am running a circuit board that needs a part to be put on it after cleaning and before conformal coating. the only problem is that after cleaning and hand assembly of the part, there is a thin whitish residue in the ckt board that one can see w

SMT before through-hole

Electronics Forum | Tue Aug 14 10:01:32 EDT 2007 | gmoritz

I have posted earlier on a UIC Radial inserter machine. We have the machine running after repair of the CnC head. However, I now have a process problem with a board that has 256x3 LED parts (768 LEDs in three colors) where only 50% of the LEDs can b

Cleaning before Conformal Coating

Electronics Forum | Fri Sep 09 15:50:08 EDT 2005 | chunks

The hand assembled part is soldered in? If so, the white residue may be from the operator using some added wave solder flux to get better wetting when hand soldering.

Cleaning before Conformal Coating

Electronics Forum | Fri Sep 09 17:01:40 EDT 2005 | GS

You can find some input on IPC-HDBK-830 Guidelines for Design, Selection and Apllication of Conf Coating. Also look at IPC-CH-65A, Guidelines for Cleaning of Printed Board Assemblies. Regards...........GS

Cleaning before Conformal Coating

Electronics Forum | Mon Sep 12 14:08:33 EDT 2005 | Amol

The fluxes used in the board manufacture are RMA fluxes. The board is cleaned according to the IPC standards and tested to ensure quality. I am thinking of designing a DOE to isolate the problem

Cleaning before Conformal Coating

Electronics Forum | Mon Sep 26 15:12:38 EDT 2005 | Amol

hi, sorry for the late reply. We solved the problem by rinsing the boards in deionized water after alcohol scrub

Cleaning before Conformal Coating

Electronics Forum | Mon Sep 12 14:38:56 EDT 2005 | patrickbruneel

Amol, Your problem is already very isolated only one part has the problem (the part that is hand soldered) Manual cleaning is very difficult. Why are you not considering a no-clean cored solder to solder the one part and skip the manual cleaning. Do

SMT before through-hole

Electronics Forum | Tue Aug 14 10:51:18 EDT 2007 | erhard

standard procedure for this would be to solder SMDs on the bottom side and the LEDs all at once on the wave - if the layout is ok for the wave. You would have to glue the SMD components, for this you would have to use a glue dispenser or a special hi

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