PDF datasheet of about 125 KB covering the 2SD1766 NPN transistor, part of the Japanese JIS 2SD numbering. The name contains only the part number and no board or device data. In repair it provides the maximum ratings, gain grouping, characteristic curves and package outline needed to identify the leads and test the transistor accurately. It is also the basis for selecting an equivalent part, keeping voltage, current and dissipation ratings at least as high as the original.
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.