Schematic for the HP 8510p, most likely the EliteBook business laptop of that name, supplied as a PDF of about 2.3 MB. No board number, ODM or revision appears in the name, so check the title blocks inside the document. A technician uses such a diagram to trace the power-on sequence, check MOSFETs and PWM controllers, follow signals between chipset and ports, and find the cause of a shorted rail. Compare the identifiers in the schematic with the markings on the board before trusting voltages or part values.
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 @alischematics. 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.