A schematic diagram for HP hardware (board 6050A0066801). Shared as “HP 6220 6050a0066801 mb a02 Schematics.pdf” — a .pdf file, 968 KB.
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 @ShareMan_Electronic_Files. 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.