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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Another PbF indicator?
On a recent "American" board , made in China, so no warning legends of PbF .
Don't know what its called, the sort of conformal coating final process at the pcb production phase is a staining coat , usually green these days. White rings showing around the solder pads after soldering may show elevated soldering temperature has been used or wrong composite material body , showing rings of plain white polyester+fibre board . The green staining having melded into the plastic or evaporated. From UL 6 digit E number and board type this is designated 260 deg C / 10 second solder dwell ( for conventional soldering) rather than 270 deg / 10 second dwell of proper made for PbF pcb boards. |
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