Small RAR archive, 578 KB, for the IBM ThinkPad T23. Only the model is given, with no board number or document type, so the contents should be verified after extraction. Files for this classic ThinkPad are typically schematics, service notes or BIOS-related data used to trace power rails, check the charging circuit and locate components on the system board. If firmware is present, read and save the existing chip first and verify the dump size matches the flash device before writing anything.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.