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Unfortunately, unlike with one or two solder joints, it is not always possible for an operator to sense the presence of a few unmelted solder joints among the several hundreds or thousands of small interconnections on a fine-pitch peripherally leaded or BGA packageThe consequence is damage to the Cu pad, which must then be repaired if possible Under these circumstances, rework stations have become invaluable Vacuum pickups or finger mechanisms attach to the component and then pull on in it with only enough force to release it from the circuit when all of the solder joints are molten, thereby preventing damage to the pads Once the defective component has been removed from the circuit board, the second step is to remove excess solder from the Cu pads This step is also referred to as dressing the pads.

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Remaining solder bumps and spikes interfere with the placement of the new component More importantly, excess residual solder, the quantity of which is not tightly controlled, causes variability to the replacement component s solder joints, which can lead to possible opens, shorts, or a loss of long-term reliability Because the cleaning or dressing step requires a solder reflow heat cycle (the second of three), the time-temperature profile of that cycle must be.

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Since the covariant derivative of the metric vanishes, we move the metric tensor inside the derivative and lower indices. For the rst term we nd gac b X c = b (gac X c ) = b X a and for the second term we obtain gcb a X c = a (gcb X c ) = a X b Therefore, we have LX gab = gac b X c + gcb a X c = b X a + a X b Since we are given that L X gab = 0, this implies (8.1). Often, we need to nd the Killing vectors for a speci c metric. We consider an explicit example by nding the Killing vectors for the 2-sphere. EXAMPLE 8-2 Use Killing s equation to nd the Killing vectors for the 2-sphere: ds 2 = a 2 d 2 + a 2 sin2 d 2 SOLUTION 8-2 Killing s equation involves covariant derivatives. Therefore we need to recall the af ne connection for this metric. In an earlier chapter we found

FIGURE 40.31 A hot-air shroud that is used to simultaneously reflow all of the solder joints on a BGA package. (Courtesy of OK International.)

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minimized to prevent damage to the more fragile Cu bond pads and nearby traces as well as to the laminate itself This procedure is typically performed manually The third step in the rework process is the assembly of the new component to the circuit board Here, the circuit board site is exposed to the third of three solder reflow cycles Also, it is at this point that semiautomated or automated rework capabilities can be particularly advantageous when compared to a manual operation First, there is the step of providing solder to the joint pads The presence of other components precludes the use of stencil or screenprinting dispensing techniques Although solder preforms are a viable approach for components of larger I/Os, the most versatile and repeatable method for surface-mount components is dispensing paste through a syringe This method may be performed manually when the number of I/O are relatively small.

However, for particularly small passive components, fine-pitch peripheral leaded packages, and area-array devices, automated solder paste dispensing is the preferred technique to control both position and paste quantity In the case of some BGA and DCA/FC components, there may not be the need for additional solder Only a flux is dispensed on the Cu pads prior to the component placement step The tackiness of the flux anchors the part in place prior to reflow soldering Next, the new component is placed on the circuit board The extent of rework placement automation depends on the mix of components Specific variables include the package type (a passive chip device, a QFP with leads, an area-array package, etc); the package size and its fragility, which determine handling requirements; and the number and pitch of the interconnections.

At one extreme, manual assembly procedures are well suited for large leadless chip resistors and capacitors (generally sizes >1206 English) as well as LCCCs and peripherally leaded packages having pitches as small as 04 mm Smaller components, particularly passive chip devices having sizes less than or equal to 0402 (English) are best placed by the mechanical handling and positioning capabilities of a rework station At the other extreme are the 10 mm, high I/O count area-array packages In these cases, the fine ball pitch, coupled with the inability to position the underside balls accurately over the circuit board pad, nearly always requires some level of automation to ensure the correct placement of the component After placement of the component, the soldering process is performed to make the joints.

Irrespective of the exact method whether it is hot gas or a soldering iron, or the extent of automation the overall objective should be that the time-temperature profile resemble as closely as possible the process used to make the original solder joints The solder paste is the same as that used in the initial assembly process As a result, each step, from the preheat stage.

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