Datasheet-style PDF for the 2SA1201, 152 KB, categorised as a schematic though the name reveals nothing beyond the part number. Under the JIS system, the 2SA prefix identifies a PNP bipolar transistor. The sheet is useful for confirming base, collector and emitter positions, reading absolute maximum ratings and comparing package outlines when a substitute is needed. Test the removed part to confirm failure, read its printed code, and pick a replacement whose voltage and current ratings equal or exceed 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.