At 43.6 KB, this PDF titled 152cmq030 is listed among schematics, yet the name is a rectifier part code for a common-cathode Schottky pair, commonly a 30 V grade. It should present ratings, curves and the package outline on a few pages. Repair technicians consult it to confirm pin assignment and current capability when replacing a failed output diode in a switch-mode supply. Check whether the original part is the CMQ or CNQ version, as packages differ, and compare the full marking.
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 @cyberlanelectonik. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.