A 107 KB PDF named for the 1BQ series, listed as a schematic but most likely a datasheet for a family of small Schottky or rectifier diodes sharing that prefix. The file name gives no board or device reference. Technicians use such sheets to decode part markings, compare current and voltage grades and confirm package size when replacing a failed diode on a power rail. Open it in a standard PDF viewer and match the exact type to the original before soldering.
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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)