Datasheet for the SFH506 infrared receiver module, a 179 KB PDF, likely a near-identical copy or edition of the series sheet that carries the _xx suffix. It describes the supply, ground and output pins, the available carrier frequencies and the expected output waveform. When a remote control stops working, compare the module output with an oscilloscope against the document while pressing a button, and match the frequency suffix on the part when sourcing a replacement, since pin order can differ between vendors.
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 @datasheet_technar_org. 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.