Catalogued as a schematic, this 67.4 KB PDF is named for the part 1SS344 and states nothing else about a device or board. Under the JIS scheme the 1SS prefix marks small-signal diodes, a family Toshiba produces in many SMD packages, so the content is likely a datasheet. Use it to identify which pins are anode and cathode, read the forward drop and leakage figures, and match the marking code seen on the PCB. Confirm the package outline before ordering a replacement part for the repair.
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.