The 2SC5526 is documented in this 52.6 KB PDF, placed among schematics in the index. By Japanese JIS convention a 2SC part is an NPN bipolar transistor, so the file should be its datasheet with ratings tables and a package drawing. The name gives no maker, variant or revision. Use it to check pinout before in-circuit diode testing, and to compare collector voltage, current and frequency ratings when sourcing a replacement. Physical marking and package shape should be checked against the outline.
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.