HEPCO Model 9000-1

Reballing Procedure

A Visual Operating Instruction

Step 1 – Place the component with clean solder pads into the template with the vacuum on – the vacuum sound will cease when the component is fully seated.   If the pads need cleaning, the template will help hold during this process, which may be achieved with either a desoldering tool or solder wick.

Step 2 – Place the flux stencil over the component using the location pins.   Squeeze a bead of no-clean tacky flux (solder paste for high-temp) on one side of the array, and using the squeegee provided tilted at about 45-degrees, go across the pattern, turn 90-degrees, and go back across the pattern to get a good registration directly on the pads.

Lift the stencil off.

Step 3 – Place the vacuum wand into the sphere reservoir and pick up a full array of spheres.   Tilt the wand up and check visually for a full array.

Step 4 – Place the wand over the location pins and lower the wand until the spheres contact the component pads.   

Step 5 – Once contact is made – press and hold the foot pedal down and lift the wand directly up.    Release the foot pedal once you are clear of the pins.   A quick visual check and you’ll see the spheres in place.

Step 6 – With the vacuum on, lift off the template.   Turn the vacuum off and the carrier plate under the component will side off the pins so you can remove the component.  Place it on a carrier or sheet and run through the reflow oven.  

Notes:   

The HEPCO 9000-1 process places the spheres on the pad and allows them to self-center using surface tension.  This minimizes stress to the sphere and the pad. 

Since there is nothing attached to the sphere during reflow, there is no warping and no trouble with coplanarity. 

Very little flux is used directly on the pad, so cleaning after reflow is not needed.  This saves washing and scrubbing of the part and prevents yet another heat cycle to the component. 

There is no contact between the wand and the flux.   Spheres do not get replaced into the reservoir after touching a fluxed component (like so many of the tilting and pour-back methods used).  Therefore, there is very little chance of contaminating your sphere reservoir.

The Model 9000-1 process  -  mechanically correct for your BGA components.

It’s the quickest, cleanest, most accurate and repeatable method available.