RAR package for the Dell Latitude D620, 1.25 MB, with the name stating only the model. Since no board number, ODM or revision is given, extract the archive and read the documents to identify the exact mainboard they cover. Service files of this type are used to trace the power-on sequence, measure rails at regulators and locate parts when searching for a short. This upload is larger than another D620 archive, so it may hold extra files, and the PCB marking should be compared before relying on it.
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 @generalschematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.