This 145 KB PDF carries the 2SD1722 part number and nothing more, so it is best treated as that transistor's datasheet. JIS conventions designate 2SD parts as NPN bipolar transistors for low-frequency applications. Repair technicians open it in a standard PDF viewer to check terminal assignment, package type, breakdown voltages and collector current. These figures guide the choice of a substitute when the original cannot be sourced. Confirm the body marking matches this number before using the data.
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.