QFN Prebumping für Rework   QFN Prebumping - Step 1 The solder paste is dispensed onto the ceramic transfer plate with Rework Dispenser 05.6. QFN Prebumping - Step 2 The QFNs are placed onto the dot arrays with the rework station Expert 09.6 and then they are heated up controlled by program. Thus you get extrem homogeneous solder depots on each pad. QFN Prebumping (patented) - Result The prebumped QFNs are now ready for trouble free and reliable rework (even with pitch 0.4mm).