IBM ThinkPad R31 circuit schematic in PDF format, roughly 1022 KB. The file name gives the model only, with no motherboard number or revision, so confirm the board identification on the PCB before relying on the pages. A technician uses such a diagram to follow supply rails, check the power sequencing and reset logic, and locate parts near a suspected short or burnt area. Any PDF reader is enough to open it, and the search function makes finding reference designators or signal labels much easier.
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.