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Soldering and Desoldering (continued)
De-soldering a BGA
Apply a little liquid flux under the BGA to help joints flow
Reflow (press ‘Start’ in the software and allow the system to reach ‘Peak Reflow’ temperature)
Remove component
Cool, remove old solder, clean (as necessary) and inspect
De-soldering a QFP (or other SMDs)
Apply a little liquid flux (use gel flux on a QFP to help joints flow and leave solder on PCB)
Reflow (press ‘Start’ in the software and allow the system to reach ‘Peak Reflow’ temperature)
Remove component
Cool, remove old solder (as necessary), clean (as necessary) and inspect
Detailed Procedures - Removing a component (Desoldering)
1. Put PCB in jaws - and position under lens
2. Press Align - position component in the centre of the IR spot and adjust spotsize to be approx. 6 -10 mm larger
in area than the component.
3. Apply flux - to solder joints.
4. Press Start button - the system will automatically cycle through the Preheat, Reflow, Soak and Cool Zones.
5. At about 150° C the flux will start working. There will be two bursts of smoke (flux fumes) and on the second
one you should have reached reflow at about 200-210°C for leaded, 230-240°C for Lead-free. The software takes
you to ‘Peak Reflow’ component temperature and ‘Soak Zone’.
6. Remove component - with tweezers, vacuum pen or the vacuum pick-up.
7. Remove old solder and clean as required
Aftercare
4. Clean flux residue off PCB if necessary
5. Check solder joints
6. Test
Standby and Shutdown
The PDR Rework system is a heating system and therefore it could be very hot in places after use. Be careful to not
allow anything to be placed on the PCB Preheater/backheater. Never leave a PCB in the PCB jaws during stand
by.
Standby - During periods of non-use, select the ‘System Stand By.lmd’ profile. This reduces all powers and
allows the system to cool down without switching off.
Shutdown - If the equipment is to be left unused for more than one hour, switch it off using the controller's
POWER switch and exit the PC software. The PC may be left running as required.
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