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PCBA Cleanliness Board cleanliness is needed to ensure sufficient removal of contaminants that could affect functionality at present or in the future. Some contaminants can actually promote growth of undesirable substances on the PCBA that can cause shorting or corrosion that would affect the PCBA s electrical functional integrity and dielectric properties over a period of time. These contaminants can be in the form of surface dendrites, internal conductive anodic filaments, and so on.

note The cnt variable in Program 10-1 is the system counter in the Propeller. See the Propeller Manual (PM).

No visible residue from cleanable or any activated fluxes is allowed. Production operations may not be required to remove cleanable residues if qualification testing is performed that demonstrates no need for cleaning the assembly. No-clean or low-residue flux chemistries may be allowed during the soldering process. However, it is critical that the cleanliness of the elements such as the bare boards and components be specified, controlled, and closely monitored; otherwise, the contaminant build-up can far exceed allowable limits for the end item s functional performance. For processes utilizing potentially corrosive rosin based fluxes, simple test options to determine cleanliness such as resistance of solvent extract (ROSE) tests can be used. Other more significant tests may be required to determine the residue properties of organic residue fluxes, such as those commonly used during hot air solder leveling (HASL) of boards. The most common of these are ion chromatography tests that can characterize the residuals and their potential hazards to the product. In the event of test failure, immediate process corrections for the cleaning process or elimination of the source of residues must be accomplished before any additional product is assembled. Particulate matter such as dirt, lint, dross, lead clippings, and such is not acceptable on PCBAs. Metallic areas or hardware on the PCBAs may not exhibit any crystalline white deposits, colored residues, or rusty appearance.

PCBA Marking Acceptability Marking provides both product identification and traceability. It aids in assembly, in-process control, and field repairs. The methods and materials used in marking must serve the intended purposes and must be readable, durable, and compatible with the manufacturing processes as well as the end use of the product. Fabrication and assembly engineering drawings should be the controlling documents for the locations and types of markings on PCBAs. Marking on components and fabricated parts should withstand all tests, cleaning, and assembly processes to which the item is subjected and must remain legible. Acceptability of marking is based on whether it is legible. If a marking is legible and cannot be confused with another letter or number, it is acceptable. Components and fabricated parts do not have to be installed so that reference designators are visible after installation. Missing, incomplete, or illegible characters in markings are unacceptable.

It should be noted that not all PCBA designs use conformal coating; however, when used, conformal coating must meet the following acceptability criteria. All PCBAs that utilize top- or bottom-layer etch (trace) runs have a solder mask over them if a solder wave or static solder bath process is used to solder components onto the PCB. Without the solder mask, the solder would bridge between many solder wettable surfaces, causing short circuits.

Having created a task flow, you can then define the pages, called view activities, and the navigation between these view activities, called control flows, that characterizes that task flow. To do this, you will be working with the task flow diagram tool and dragging and dropping either pages or other task flows from the Application Navigator; or dragging and dropping task flow components from the Component Palette.

Conformal Coating Conformal coating is an insulating protective covering that conforms to the configuration of the objects coated when it is applied to a completed PCBA. The purpose of conformal coating is to provide a temporary barrier to environmental exposure of chemicals, humidity, and condensation. It is also a barrier from surface contact of contaminants caused by handling, and can provide physical support for components from shock and vibration. It is not, however, a hermetic seal and is eventually permeable. To be most effective, conformal coatings should

be homogeneous and transparent. Most coatings will contain an ultraviolet (UV) tracer to make inspection easier through the use of a black light. The conformal coating should be properly cured and not exhibit tackiness. Defects associated with conformal coating are as follows: