Electronic Restoration >> How To Restore Fire Damaged Electronics

The project shall minimize the usage of any commercial parts for all grade levels. There are no controls in commercial industry that are imposed uniformly upon all manufacturers to build in a common acceptable quality level. While many manufacturers maintain good quality controls, How To Restore Fire Damaged Electronics others do not. 

This can lead to significant variation in the risk associated between parts from different manufactures, as well as between various part types and Lot Date Codes from the same manufacturer, depending upon process maturity and stability. The qualification and How To Restore Fire Damaged Electronics screening processes provided in this document are intended to detect poor quality lots and screen out early random failures.

However, these tests cannot bring in quality that may not exist in the commercial manufacturingprocess. Before a decision to use a commercial part is made, other options such as designmodifications that would allow the use of available military parts should be appropriately evaluated.This evaluation is important from a cost standpoint also, How To Restore Fire Damaged Electronics since the screening and qualification ofcommercial parts can be very expensive for all grade levels. 

Before initiating the procurement for anycommercial part, a determination of the manufacturers’ reliability controls shall be performed to ensurethat best common industry practices are implemented at their production facilities.6.7.2 Part Age and Storage Restrictions. Parts drawn from inventory having lot date codes older than5 years, How To Restore Fire Damaged Electronics shall be reviewed by PCB to determine the need for re-screen. 

Parts stored in conditions wheremoisture or ESD are not controlled shall not be used.6.7.3 Part Obsolescence. The project shall prevent selection of parts that are inactive for new design, How To Restore Fire Damaged Electronics and shall not allow the use of obsolete parts in new projects, or allow those that are scheduled to bediscontinued prior to program completion.

Exception: For projects having multiple units that are produced and deployed over a period of years, inorder to facilitate sufficient quantity to complete production without redesign, How To Restore Fire Damaged Electronics arrangements may bemade to procure and properly store sufficient quantities to complete production after parts become obsolete.

Alerts. The PPE shall continuously monitor part procurements and parts drawn from storage for impact of GIDEP Alerts and NASA advisories. Parts traceable to date codes and How To Restore Fire Damaged Electronics manufacturers listed inalerts shall not be used without additional analysis. When necessary, in order to aid a part evaluation, the following areas of expertise are available forconsultation: 

Radiation Effects. The Radiation Effects Branch (GSFC Code 561) can be consulted for aradiation assessment of parts that have no existing test data (for TID, SEE, etc.) or are susceptible tolatchup, transients, low dose, or How To Restore Fire Damaged Electronics other radiation effects because of the device technology. The Radiation Effects Engineer shall be consulted for analysis of the radiation environment and radiation dosage level a proposed part will be exposed to in its application. 

The project shall document the radiation analysis on each part to show that project specific radiation requirements are met.6.8.2 Reliability. Reliability Engineering (GSFC Code 302) can be consulted in order to determine the How To Restore Fire Damaged Electronics effectiveness of part screening such as burn-in conditions. The reliability engineer shall be consulted to assess the risk of parts proposed for use in severe applications. 

For example, How To Restore Fire Damaged Electronics the project shall not allowthe selection of parts for use outside the manufacturer-specified temperature range without demonstrating that the parts can be used safely beyond their published temperature rating. If part reliability cannot be ensured for mission life through analysis or additional testing, an alternate part,additional redundancy, or redesign is required. 

Materials. When necessary, the Materials Branch (GSFC Code 541) can be consulted in order todetermine component material properties, How To Restore Fire Damaged Electronics such as outgassing, thermal, or physical stability of materials,in a proposed application. Parts with unstable material properties that cannot be stabilized through additional processing for the proposed application shall not be used. 

Also, due to the risk of whisker growth that can lead to short circuit conditions, pure Tin, Cadmium and Zinc shall not be used as afinal finish on EEE parts. Refer to paragraph 6.0, Instructions, pages 4 through 10, How To Restore Fire Damaged Electronics of Section 1 for general part requirements applicable to all part types. The following additional information is unique to this section.

Tables 1C and 1D provide detailed descriptions of available connector and contact configurations as an aid to designers.2) Screening requirements are listed in Tables 2A through 2J. Tables are divided into commercial/ SCD (Com’l/SCD) vs. Military (Mil) for three quality levels. Connectors procured to military specifications normally have tests performed periodically on samples, How To Restore Fire Damaged Electronics while commercial linesmay not be as closely monitored. 

Consequently, in this document, military connectors do not require the same tests as commercial.3) Visual and mechanical inspection performed in Tables 2A through 2J is critical for connectors, How To Restore Fire Damaged Electronics and Table 4 lists defect criteria for each type of connector. Visual inspection shall verify thatconnectors/contacts are properly marked, free of defects and fabricated with good workmanship.

Mechanical inspection shall verify that connectors or contacts satisfy design, construction and dimensional requirements, and were manufactured with the specified materials and finish.4) Depending on the application, outgassing, atomic oxygen, ultraviolet radiation degradation, How To Restore Fire Damaged Electronics and residual magnetism may need to be considered in selecting connectors and contacts for space application. 

Requirements and recommendations are provided through out the section. Materials are a primary consideration in selecting connectors for space flight application and the following requirements and How To Restore Fire Damaged Electronics guidelines are provided.1) Base Materials for Metal Shell Connectors. For metal shell connectors, base metals shall beused which demonstrate low permeability (i.e., resist establishment of magnetism in thematerial). 

Machined aluminum alloy, corrosion resistant steel or brass are the preferred metals.For connector contacts, copper, beryllium copper or half hard brass are the preferred metals. Insome applications, How To Restore Fire Damaged Electronics it may be necessary to screen connectors and contacts for specific levels ofresidual magnetism.2) Preferred Finishes for Metal Shell Connectors and Contacts. 

Electroless nickel plating is thepreferred finish for circular, general purpose D-Subminiature, and How To Restore Fire Damaged Electronics Microminiature metal shell connectors. Gold over copper flash is the required finish for D-Subminiature connectors whenresidual magnetism is a consideration. 

Passivated stainless steel or gold is the required finishfor coaxial connectors. Gold plating in accordance with ASTM-B488, Type II, Grade C, Class1.25 (50 micro inches) (formerly MIL-C-45204, Type II, Grade C, Class 1) is the preferredfinish for contacts over the entire contact, How To Restore Fire Damaged Electronics including the engagement area.

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