JetDirect Card not recognized (fix)

HP Jetdirect cards are often do not recognised to the same old failure- cold solder joint under big ARM processor mounted by BGA technology on the PCB.
Hewlett-Packard LaserJet printers use several models of network cards with same typical failure after several years of work. Those are cards HP Jetdirect 600N, HP JetDirect 615N, HP JetDirect 610N


Easy fix with almost no tools available:

1. You get hair dryer and heat BGA chip for 10-15 minutes
2. Let it cool slowly without moving.
3. Test it in the printer.
4. Leave comment including model of your card and printer here.

Usually those 3 steps are enough to make it work again.

If you are for example graduate student and have wonderful toys to play around such as temperature controlled furnace you can do the following:

1. Remove white plastic top plate with name of the card on it.
2. Place card horizontally the way it suspended in air inside furnace (see picture)
3. Heat it to temperature of 160C (320F) for 15-20 minutes
4. Let it cool without touching
5. Test it in printer.
6. Leave comments here including model of your card and printer.

Good luck champions! :-)