Acorn Computers Limited BBC A, Hardware Manual, Page: 18 / 47

18
2.6 Defluxing.
After soldering, flux deposits will be left on the printed circuit board, which look unsightly as well as
possibly causing high impedance tracks between soldered joints. These deposits can be easily removed,
using a proprietary defluxing solvent (e.g. RS stock number 555-134), which should be applied using a
stiff brush. It is recommended that the manufacturers instructions supplied with the defluxing fluid are
carefully read and understood, since the solvents used can be harmful, are particularly if defluxing is not
carried out in a well ventilated area. It is also important to ensure that the point solvent does not come
into contact with the bodies of the components on the PCB, since the solvent may dissolve certain types
of component marking and some thermoplastic.