A schematic diagram for HP hardware (board LA-D702P, LA-D707P). Shared as “AFS HP BDL50 LA-D702P LA-D707P vvv.pdf” — a .pdf file, 2.78 MB.
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 @afsschematicfree. 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.