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BARE BOARD TEST EQUIPMEMT
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the network. The pliant planar surface holds the network grounded. Similarly, if two adjacent networks are simultaneously contacted by different scanning contacts, and if at that moment no area of at least one of these networks is grounded by the compliant planar, then it will be observed that at least one of the two networks can be charged to a high voltage and that they must not be shorted together. Software in the prescreening system uses the real-time measurement results to image the board and constantly adapt to any shifts in geometry.Thus the system solution is useful for very-fine-pitch substrates appearing in large-panel form. In a manner similar to the preceding examples, significant portions of most boards may be tested using this apparatus. Some portions of the board usually remain untested, and these measurements are reserved for the subsequent final test by the flying-probe test system. The flying prober also retests and verifies any failures reported by he prescreening system, effectively eliminating most false failures. The resultant speed increase of the combined systems is tremendous, so that true production volumes can be tested. It is important to note that no fixture is required and that both systems provide for true DC measurement of continuity and isolation. Moreover, because high-density interconnect (HDI) features that are too fine for the scanning contacts of the prescreener are simply passed on to the prober, this solution seems to be appropriate for very advanced substrates. A second commercially available pre-screening system is very similar, but uses a capacitive measurement made at each time of the finely spaced row of scanning contacts. The overall function is very similar to that just described, except that the alternative of a true DC measurement of continuity and isolation is not provided. For those customers that do not perform such tests with their existing flying probers, this may not prove a significant limitation. For high reliability applications where DC continuity testing is required the utility of this method may be reduced.
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VERIFICATION AND REPAIR
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The test system identifies faults on the board. Assuming that repaired boards are acceptable to the end user and that it makes economic sense to repair boards, a repair process normally follows testing. Because fixture problems, contamination problems, product registration problems, and other issues often result in false error reports, a verification process usually is added between testing and repair. During verification, a technician reads the fault data and makes confirming measurements to determine whether the reported faults are genuine. If verification of the fault finds that the fault report is valid, the board proceeds through the repair function. If the fault report is not valid, the board may be either retested or directly shipped, depending on customer requirements, in-house policy, etc. When deciding on a ship-from-verification policy, be mindful of the possibility of multiple defects masking one another (an open hiding a short) or appearing only under the pressure of the fixture. If possible, it may be preferable to perform a complete retest. In some cases, simple tabletop meter equipment is used for verification, and verification may actually be done at the repair station by the repair technician. More commonly, some form of computer-assisted search-and-display tool is employed. The computer has information concerning the product and test program available, and searches the artwork pattern for areas likely to contain the fault being considered. The resulting risk area is displayed to the operator or superimposed as a visual projection onto the suspect board, simplifying the task of placing meter leads. Automatic verification may be accomplished by a flying-probe type system. The flying probe performs a similar analysis, but does the retesting itself and displays a final result.Video camera systems may provide image capture of suspected fault sites, storing the image for subsequent recall at the repair station. Advanced systems may even suggest the repairability of particular fault sites according to user-defined rules. Figure 38.21 shows an example of a fully automatic verification system and Computer Aided Repair (CAR) station. At the repair station, a display computer similar to that
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