The 163 KB PDF named 408CNQ060 sits in the schematic category, yet its name identifies no device or board. The code resembles a semiconductor part number for a large rectifier module, so expect a datasheet covering pinout, ratings and mechanical outline. For repair work it helps verify which terminal is common, check maximum reverse voltage and pick a replacement of equal specification. Testing such a part out of circuit with a meter in diode mode quickly shows a short. Match the exact marking before relying on the values.
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.