PDF SMD codebook for mobile repair, 3.04 MB, listing marking codes found on small surface-mount parts. Tiny transistors, diodes and regulators carry short printed codes instead of full part numbers, and a codebook like this helps identify the component and find a suitable replacement. It is not a schematic for a particular device, so no model or board is involved. Cross-check any match against the package type and the circuit it sits in, since the same code can be used by different manufacturers for different parts.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematicmobile. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.