THE SMD REMOVAL KIT
Remove all SMD's Fast, Safe, Easy, and Affordable With Chip
Quik and a Solder Iron. This Unique Rework Method Has Become Known
Globally as The REWORK SOLUTION
SMD 16 Removal Alloy 16ft. in 6.5in. lengths
SMD 291 No Clean Paste Flux in 10cc syringe w/tip for solder and
desolder
SMD 2000 Complete Solder Desolder Kit
PLEASE VISIT THE NEW CHIP QUIK ON-LINE STORE. WE SHIP
DOMESTIC AND INTERNATIONAL DIRECT TO YOU. WATCH AS WE CONTINUE TO
ADD NEW UNIQUE REWORK PRODUCTS.
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DO I INSTALL THE NEW SMD? THIS IS THE MOST FREQUENTLY ASKED
QUESTION.
Chip Quik receives continuous feedback from e-mail
inquiries, testimonials, phone calls, and questions asked
while demonstrating Chip Quik at trade shows. The most
frequent question asked is... "Now that I have successfully
removed the SMD and the pads are perfectly clean, how do I
install the new chip"? My answer is... With Chip Quik you have
already solved the major challenge by safely removing the SMD
without lifting a pad or damaging an adjacent component.
Soldering on the new chip requires a careful selection of
tools, equipment, and some practice in developing the
necessary skills. I have found that many who attempt
resoldering on the SMD are not successful because they are not
prepared and are misinformed. LEARN TO SOLDER ON THE
SMD!...YOU CAN DO IT!
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PREPARE PADS BEFORE SOLDERING ON THE
SMD
 Before starting the resolder
procedure it is important that all the pads are thoroughly
clean and level in order to eliminate any coplanarity (height)
problems. Clean pad surface with a good cleaner to remove
oxidation. Inspect pads under magnification. You are now ready
to install the new SMD.
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SELECT A SOLDER IRON, TIP, SOLDER, AND FLUX
 SOLDER IRON: A good solder
iron is more important than most realize. The temperature must
remain constant while applying the iron into the solder joint.
This feature is called controlled heat delivery under varying
thermal loads. In a quality solder iron this is accompished by
having the temperature sensor located in the tip. This allows
the closest possible monitering of extremely small temperature
variations of the tip. When soldering or desoldering an SMD,
the worst thing is to have to wait for the iron to return to
its set temperature while applying heat. This can be the
greatest cause of potential damage to pads and adjacent
components. By using the correct iron you can effectively
solder at a safe lower temperature of approximately 600deg F.
When soldering with the new higher temperature no-lead
solders, heat delivery becomes even more important. Your
choice of a solder iron will determine the quality of your
rework.
SOLDER TIP: The most common method of resoldering the SMD
is called drag soldering. This is done with a slanted angle
tip wide enough to cover the soldering area. A clean well
tinned tip is important to provide good solder joint wetting
and heat transfer. The most common cause of tip damage is high
temperatures with certain fluxes. Another well known method
uses a Mini-Wave Tip. This tip has a minature solder reservoir
in the tip that holds a small amount of solder that is
released upon demand. As you drag solder the tip rides on a
mini-wave that rides over the pins as it releases solder. The
tip actually never comes in contact with the pins. The tip is
available in different sizes depending on the application. I
use a different tip for solder and desolder.
SOLDER: Use 63/37 solid core tin lead solder called
eutectic alloy. This means that it becomes molten and solid at
the same temperature of 361F (180C). This eliminates the range
(plastic range) that solders go through as they solidify. Also
some rosin core solders do not fully activate when soldering.
Solder paste is also used which consists of a mixture of lead
tin granules with flux. Solder paste is used in manufacturing
but it does have applications in rework that we will cover in
future newsletters.
FLUX: Use a No Clean Paste Flux that is applied with a
syringe and nozzle tip. The flux is non-conductive, non-
corrosive and can easily be cleaned up with isopropyl alcohol.
Use flux generously with all soldering. This is your key to
good solder wetting. Also using a thick paste flux prevents
the flux from running all over the board.
SOLDER
IRON »
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USEFUL TOOLS FOR SOLDER AND DESOLDER
Dental Pick & Tweezers: Both are very helpful for
handling, placement, lead straightening, and prying off or
lifting the SMD. Tweezers should be non-magnetic.
Vac-Pen: Used to pick and place SMD's accurately on pad. A
must on micro-chip components. Should be ESD safe. Comes with
different size suction tips for different size components. A
great handling device for miniature components.
Magnification and Lighting: Both are very important for
inspecting pads, placement, and the final solder joint. It is
helpful to watch each pin pad solder joint as it is being
formed. A magnifying head mask and a high intensity light
works well. The most important need for light and
magnification is to accurately place the chip on the center of
the pads before soldering.
COMPLETE
SOLDER DESOLDER KIT »
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HOW TO SOLDER THE SURFACE MOUNT COMPONENT TO THE PCB
Now that you have carefully selected the recommended items we
need for soldering, we are ready to resolder the SMD to the
Circuit Board. Inspect all pads to make sure they are clean
and equal in height. With syringe apply a thin bead of tack
flux along all pads. With a Vac-Pen pick and place SMD on pads
making sure the key for pin #1 is aligned with the correct
pad. Use magnification with good lighting to make sure the pin
pad alignment is perfectly centered on all sides of SMD. The
tack flux helps to keep the SMD from moving out of place. Hold
down SMD firmly with a dental pick so it will not move.
You are now ready to solder on the SMD. Set solder iron at
600Deg.F. Tin solder tip and carefully tack down 3-4 pin
locations. Check pin pad alignment once more for this is your
last chance to make a correction. Now drag solder by holding
iron at a 45Deg. angle as you run along all pins on each side
of SMD. Apply more solder as needed. If you create a solder
bridge between pins, use solder braid to remove bridge. Clean
area off with an acid brush and isopropal alcohol. Inspect
work for perfection.
This is the most popular method used in the industry for
low volume rework. With a little practice you can master the
technique. The best part is you can do your own rework. The
reward will be all the boards that you can prevent from
entering the trash. HAPPY REWORK
CHIP
QUIK ON-LINE STORE »
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