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In Solder Rework/Repair, Solder Training and Tools

April 2009 Vol. 2, Iss. 18

 

Dear Subscriber;

Along with an article on our newly patent pending leadless device rework process as well as an update on the solder "rinsing" technique, we have included a fun reference on building a "blender defender". The building blocks of this wacky device can be used to not only deter pets from going where you do not want them to but it can rid of "varmits" and unwanted visitors from certain areas. Check this out!
We were pleased to recently host 15+ engineers during our APEX teaching seminar on reballing.

We are also proud that BEST staff has won for the 4th year in a row the Circuits Assembly "Service Excellence" award.

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As we have said now for 100+ years-GO CUBS!

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Bob Wettermann
President, BEST Inc

 

New Method for Reworking QFNs and Leadless Devices

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"Bumped" Leadless Device

A stay-in-place stencil bump QFN rework process developed by BEST called "StencilMate" eliminates many of the concerns and drawbacks of other methods. This stay-in-place bump method uses polyimide stencils, one temporary stencil to match the component and in some cases to match the substrate. Stencils are placed over the land patterns of the device and or the PCB, controlling the solder print area. Component prep comprises cleaning pads of any residues with solder wick and isopropyl alcohol. A precision polyimide stencil is aligned and applied to the bottom of the component. Solder paste is applied with a manual squeegee. The component is then reflowed according to the paste and component manufacturer's profile. Post-reflow, the polyimide stencil is removed from the component, leaving solder bumps instead of paste deposits or flat pads.  Align and place the semi-permanent polyimide stencil to the substrate. Roll the solder paste through the apertures of the stencil and wipe any excess paste from the stencil surface with a lint-free cloth. Manually place the QFN into the solder-pasted apertures on the substrate stencil. As the solder bumps on the QFN align with the apertures, you will be able to "feel" the solder bumps on the device slide into the wells of the stencil apertures. Reflow the component according to the appropriate profile. After reflow, clean and inspect the assembly as usual.

More on this new process here.

 

"Rinsing" of Lead from Lead Free Assembly

New BEST Logo Are tight controls necessary for soldering iron tips when switcing between leaded and non-leaded solder?

BEST has developed a "rinsing" technique for eliminating lead from a soldering iron tip. Results of independent laboratories have shown that this technique is effective in allowing you to "switch" solder materials by using this "rinse" method on the same soldering iron and tip without a risk of lead contamination of the solder joint. This technique, when used properly, will allow you to switch alloys without switching soldering tips.

See the study in support of this technique.

A video on the technique is found here.


 
blender defender
Blender Defender for that Annoying Pet/Person

Have a cat or person that won't stay off your counters? This guy finally got fed up with it enough to do something about it: He scares the "SA%#@#%" out of the pet/intruder with a motion-detecting blender (while recording the results for his own amusement). If you were to walk in his house, you may see something you don't normally see in a kitchen. On the wall, to the left of his sink is a webcam . It is plugged into the network jack and screwed into the wall plate cover, supporting itself. The camera is being monitored for motion by his computer  remotely.
All the details here.

 
TABLE OF CONTENTS

New Leadless Device Rework Process

Solder Rinsing Process

The Blender Defender

QUICK LINKS

Laser Services       

USB Device Recovery

Training and Certifcation

Reduce Your Rework Costs
ReworkCrunch

BEST can take a bite out of your rework costs.Call(847) 797-9250 and ask Laura how we may be able to help!

Replacement Circuit Frames
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BEST circuit frames offer nearly 3 X
as many useable replacement land
and trace patterns than other brands
available on the market.  More info on bond strength test data.

 
 

BEST INDUSTRY FORUMS
 

This Industry forum is a discussion area where opinions are given on equipment and processes, help is given on process problems and resources for problem-solving and troubleshooting are shared.

 
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PCB Repair Video Training Series

The BEST PCB Repair Training series includes a group of 9 different professional PCB repair training videos. The techniques are clearly taught via professional narration as well as under the microscope views of "how to repair" a PCB.

SOLDERING TIPS

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Newsletter

WHAT'S NEW?

ARTICLE: A Look Into PCB Rework and Repair

ARTICLE: IPC-A-620 Gets a Facelift

 

 

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