Electronic Restoration >> Fire Damage Guitar Restoration Tips

In some parts the sensitivity of the input/output ESD protection circuits increases with temperature and these circuits can be turned on easily, at lower and/or shorter voltage spikes, than at room temperature. For this reason, Fire Damage Guitar Restoration Tips special care should be taken to prevent possible power line transients during burn-in testing.

Excessive proportion of functional BI failures, even when the total number of failures is within the PDA limits, Fire Damage Guitar Restoration Tips might be an indication of serious lot reliability problems. In these cases additional testing and analysis of the parts might be required.7.7/ Steady-state burn-in is performed on all linear and mixed signal devices (see Table 2A for details on burn-in conditions). 

The duration of steady-state burn-in can be reduced 50% if the parts are to be subjected to dynamic burn-in testing.7.8/ Dynamic burn-in is not required for parts operating under steady-state conditions, Fire Damage Guitar Restoration Tips e.g. voltage references, temperature sensors, etc.7.9/ Only one type of BI test, either static or dynamic, is required for level 2 and 3 parts.7.10/ 

Under special circumstances, when it is technically and economically viable, and for components, Fire Damage Guitar Restoration Tips which are difficult to assess at the piece part level,alternative testing in lieu of static and/or dynamic BI testing (for example, board-level burn-in) may be permitted. It is the responsibility of the project PE to document and submit a rationale for the technical feasibility and equivalency of the alternative testing to the project and GSFC Code 562 for approval. 

Board-level burn-in shall not be routinely substituted for piece part burn-in as a convenience. All parts shall be selected from a screened lot.1.2/ It is the responsibility of the Fire Damage Guitar Restoration Tips project parts engineer to submit qualification test results to Code 562 for logging into the Code 562 PEM database.2/ This step is not performed if results of the screening are available.

Radiation hardness of the parts must be assessed on a lot-specific basis according to the project requirements. So that analysis can be completed prior to screening and qualification, un-screened samples can be used for this test. An additional number of samples, Fire Damage Guitar Restoration Tips depending on radiation requirements, shall be provided by the project to perform this test.

Moisture soak is performed as a part of preconditioning to mimic worst-case moisture absorption conditions of the PEM molding material, which could cause PEMs to be damaged during soldering to boards.5/ Conditions of the temperature cycling, HAST, Fire Damage Guitar Restoration Tips and high temperature life testing (HTOL) can be tailored according to specifics of the device application per Code 562 approval. 

Guidelines for application-tailored qualification testing of PEMs shall be developed by Code 562.6/ The junction temperature should not exceed the absolute maximum rated junction temperature for the part. If 125 C ambient causes the maximum rated junction temperature to be exceeded, Fire Damage Guitar Restoration Tips the ambient temperature should be decreased appropriately.

Temperature cycling is performed after HTOL testing on the same samples only for economic reasons. This Fire Damage Guitar Restoration Tips test can be also performed on a separate group of parts if additional samples are provided (22, 22, and 10 samples for levels 1, 2, and 3, respectively).8/ This C-SAM examination is performed to estimate mechanical damage to the part due to temperature cycling and reflow simulation (or resistance to soldering test) by comparing acoustic images with the baseline measurement results.

Failure analysis is performed on any failures during qualification tests to determine whether they are caused by lot-related defects, Fire Damage Guitar Restoration Tips manufacturing process problems, or improper testing. If no failures are observed, a special evaluation (DPA) should be performed to ensure that no degradation of wire bonding,cratering, and mechanical damage to glassivation and metallization systems occurred (for level 1 and 2 parts only). 

Destructive Physical Analysis, or Construction Analysis (CA), shall be performed to obtain information regarding design, workmanship, Fire Damage Guitar Restoration Tips and process quality related to a PEM manufacturing lot. Samples for DPA (5 pcs. minimum) should be selected randomly from different portions of the procurement lot. 

See Section 5 of PEM-INST-001, Instructions for PEM Selection, Screening, and Fire Damage Guitar Restoration Tips Qualification, August 2002,for GSFC DPA procedure. Derating requirements for PEMs are listed in Table 4. Taking a conservative approach, derating requirements for PEMs should be more stringent than the requirements for their high-reliability equivalents. 

In addition to the requirements in Table 4, derating specific to some PEMs may be required based on design and Fire Damage Guitar Restoration Tips technology of the part intended for special application. All part-specific derating shall be approved by the project and GSFC Code 562. The character "X” designates "use as is."2/ This specification covers all types of relays intended for level 1 applications. 

A list of S-311-P-754 relays is given in Table 1A alongwith their applicable detail specifications.3/ Acceptable for use in levels 1 and 2 provided they are procured to failure rate "M" or better (when applicable), Fire Damage Guitar Restoration Tips the procurement lot is verified to have been subjected to small particle cleaning and internal inspection during assembly, and to PIND testing afterwards.

For level 2, in lieu of the internal cleaning and inspection, Fire Damage Guitar Restoration Tips three random samples from the procurement lot may be subjected to and pass DPA in accordance with the requirements in GSFC S-311-M-70 with the following exception: resisudal gas analysis (RGA) is not applicable. Screening in accordance with Table 2 herein and qualification in accordance with Table 3 herein are required.

Any test required by Tables 2 and 3 that is already performed by the procurement specification (military or SCD) need not be repeated. However, lot specific attributes data for screening tests, Fire Damage Guitar Restoration Tips and lot specific or generic attributes data as applicable to various test groups of qualification tests must be submitted to show that tests were performed with acceptable results.

Relays fabricated to manufacturer's "high reliability" or "space grade" flow and meeting all of the Table 2 and Table 3 requirements may be considered acceptable for use without an SCD. This screening table is suitable for both low level and high level relays, latching Fire Damage Guitar Restoration Tips and nonlatching. Unless otherwise specified, relays with DC resistive contact ratings up to and including 2 amperes shall be considered low level relays. 

Relays with DC resistive contact ratings higher than 2 amperes shall be considered high level relays.2/ For level 1 applications, Fire Damage Guitar Restoration Tips screening in accordance with GSFC S-311-P-754 is acceptable in lieu of the screening specified in this table. For levels 2 and 3,screening in accordance with MIL-PRF-39016, as applicable, is acceptable in lieu of the screening specified in this table, except PIND testing is also required for level 2 applications.

It is the responsibility of the user to specify detailed test conditions and pass/fail criteria for each test. These values shall be based on the nearest equivalent military specifications, manufacturer's specification, Fire Damage Guitar Restoration Tips or the application, whichever is most severe. 

Unless otherwise specified, 100% of there lays shall be submitted to the tests and inspections in this table in the order shown. For level 2, if cleaning and small particle inspection are not performed, Fire Damage Guitar Restoration Tips a DPA per S-311-M-70 is required with the following exception: residual gas analysis (RGA) is not applicable. 

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