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Spare parts maintained at this level of repair are known as bench stock. Intermediate-level maintenance deployment can vary widely, and is highly dependent on desired operating conditions. In minimal maintenance concepts, there may be minimal or no I-level maintenance, a system known as two-level maintenance (O-level
On a forum where professional repair people discuss reflowing of laptop computer graphics chips, different contributors cite success rates (no failure within 6 months) of between 60 and 90% for reflowing with professional equipment and techniques, in equipment whose value does not justify complete reballing. [4]
Manufacturers may not support component-level repair of printed circuit boards because of the relatively low cost to replace compared with the time and cost of troubleshooting to a component level. In board-level repair, the technician identifies the board (PCA) on which the fault resides and replaces it.
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All components of a design, The functionality of each component, The failure modes of each component, The effect of each component failure mode on the product functionality, The ability of any automatic diagnostics to detect the failure, The design strength (de-rating, safety factors), The impact of any latent fault tests, and
Making sure that all components needed to test the unit are added into the cost matrix of the final product. This components may include the UART/RS232 chips for talking to the UUT, Ethernet ports for upgrading the firmware, JTAG connectors, etc. Defining what manufacturing test process is needed based from the product definition.
3.5" Floppy disk drive by Alps Electric with FRU number A field-replaceable unit (FRU) [1] is a printed circuit board, part, or assembly that can be quickly and easily removed from a computer or other piece of electronic equipment, and replaced by the user or a technician without having to send the entire product or system to a repair facility.
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