Hi,
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I would not try to do this without the option to preheat the board to around 80C.
The problem is that it really hard to extract the 56pins in one go.
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I my suggestion is to use ChipQuick on a preheated board to lower solder the melting
temperature to below 100C and use a heatgun to heat all 56pin in one go.
Lift the connector and clean with a cotton swab and more flux and a little heat.
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To clean out the holes a compressed air gun might be of help while still heating.
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ChipQuick and Chip Quik Flux are available at Mouser and other distributers.
there versions for lead and lead free soldering.
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6 layerboards are really hard as its takes away a lot of heat and true holes
connecting multiple layer are easly damaged.
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Good luck | Regard Rens
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