5 Zone HVA70 Oven Board 6 layer, 10" x 13" lots of space, most critical is 100 pin QFP AIM Water Soluble 487 Tin Lead paste on SN100C HASL boards
This board is giving me disproportionate grief! I am running 23 in / min which gives me about 3.1 minutes in the oven. AIM recommended this. The only way I can get acceptable results is to add flux with a spray bottle. I have tried lowering my activation zones, more heat from the bottom etc. My peak temp is 220 using IR probe looking in from the end, and I am getting approximately 1 min above liquidous. Tomorrow I will use the MOLE more, but we had started with a profile based on the mole which looked like it would be suitable. With this post I am mainly looking for suggestions on differentiating between the flux being burned out by the time it gets to reflow, and or inadequate peak temp or duration in liquidous. In the past I have seen flux burn out on boards where small parts alone on the board did not solder, but busier areas of the board did. This is generally not the case with what I am seeing here. Reply with suggested profiles and I will compare them to what I have been testing so far. Thanks Pete
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