Schematic for a T23 machine in PDF format, 901 KB in size; nothing else about the brand, board code or revision is given by the name. The diagram is useful for following supply rails, identifying regulators and their enable signals, and checking connector pinouts during diagnosis of no-power or no-display faults. Any PDF reader will open it. Older designs often went through several board revisions, so check the title block against the silkscreen on the motherboard before relying on component values.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.