The 2SD1244 with an _E suffix is the subject of this 44.8 KB PDF, placed in the schematic category. Its number follows the Japanese JIS scheme, where 2SD indicates an NPN bipolar transistor for low-frequency circuits; the suffix is not explained by the name. Expect a short datasheet with ratings, characteristics and pin identification. Repair use centres on checking the device out of circuit, verifying its leads and choosing a substitute whose voltage, current and dissipation limits are not lower.
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.