scan barcode asp.net mobile REFERENCE in Software

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REFERENCE
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1. Freedman, G. M., and Baldwin, E. A., Method and Material for Maintaining Cleanliness of High Density Circuits during Assembly, Proceedings of the SMTA Pan-Pacific Conference, February 2003.
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QUALITY
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Copyright 2008 by The McGraw-Hill Companies. Click here for terms of use.
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ACCEPTABILITY AND QUALITY OF FABRICATED BOARDS
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Chair/Chief Technical Officer Microtek Laboratories,Anaheim, California, and Changzhou, China
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51.1 INTRODUCTION
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51.1.1 Reasons for Appropriate Acceptance Criteria Other than the financial tie between the user and supplier, nothing affects the relationship between these two more than product acceptability and quality. These issues define the relationship. As the printed circuit board (PCB) is the foundation for almost all electronic products, the user cannot tolerate defective boards. At the same time, cost is always a critical issue and imposing expensive and unnecessary acceptance criteria can be a major disadvantage. Failure to provide acceptable and quality product is the largest factor that affects the deterioration of the relationship between user and supplier. All of the components in an electronic product rely on the PCB to get information and power from place to place. An interruption of this process because of a defective PCB results in a failed product. In other words, a poorquality product at a low price is worthless. 51.1.1.1 Customer Satisfaction. Brand name is one of the most valuable things that the original equipment manufacturer (OEM) possesses. A product s success or failure is quite dependent on the perceived quality that the brand name suggests. OEMs rely on getting products quickly from the design programs to market, and a slowdown due to quality issues can significantly impact a product s introduction and thereby affect their brand.The negative publicity from field failures can also have a significant affect on a brand. Agreed upon acceptance and quality criteria reduce the likelihood of nonconforming PCBs. 51.1.1.2 Reduction of Cost. If the PCB buyer clearly states the required acceptability and quality criteria to the manufacturer, the manufacturer can more clearly understand the buyer s costs. Cost reductions are a permanent fixture in the manufacturing environment. For companies to survive in this competitive market, they must address costs. Unacceptable, lowquality product that cannot be sold is a direct and significant cost.
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PRINTED CIRCUITS HANDBOOK
51.1.1.3 Liability and Litigation. Showing that the PCB was purchased to mutually agreed upon standards goes a long way to minimizing litigation and financial liability. 51.1.2 Printed Circuit Board Functions A PCB is required to do three things for the buyer when it is received:
The PCB physical form should match the intended design. The dimensions and placement position of the interconnection points along with the quality of the coating on these interconnection points must be acceptable and of high quality to facilitate the attachment of components. The PCB should provide proper interconnection between components. This allows the assembly to function properly as intended. The PCB should provide insulation between interconnection points that should not be connected.
These three items should be acceptable and of high quality at the time of purchase and continue to remain acceptable and of high quality throughout the expected life of the product. There are a lot of details between the few preceding lines defining those three things. The rest of this chapter will define the details of acceptability and quality for the PCB in order to fill in the spaces created by the three previously listed requirements. 51.1.3 Industry versus Customer Standards Properly implemented acceptability and quality criteria give both user and supplier a clear picture of what is expected. Without clear instructions on how the acceptability and quality of the PCB should be implemented at the supplier, the user is unlikely to get a product that meets his or her needs. A clear definition of what the user wants can help make the relationship between the two much more successful, especially as complexity of the PCB makes acceptability and quality criteria more critical and challenging. In general, PCB manufacturers have gotten larger and produce many more PCBs. This makes the user s individual PCBs a much smaller part of the big picture and their uniqueness may be lost. Therefore, it is essential to define what is required for acceptability and quality clearly and early in the relationship between the user and supplier. 51.1.4 Objectives of Acceptability and Quality Criteria The PCB needs to be supplied at a quality level that is capable of withstanding the assembly process, as it will undergo several operations to mount and rework components and connectors. This assembly and rework process has gotten more complicated and damaging to the PCB, especially with the introduction of lead-free products. The acceptability criteria should attempt to anticipate the conditions of the soldering process to ensure the PCB will survive the assembly and rework process and still function as intended.
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