Catalogued among schematics, this 129 KB PDF named 89cnq150 is most likely a datasheet for a dual common-cathode Schottky rectifier module, the 150 suffix typically denoting a 150 V reverse voltage. The manufacturer is not given in the name. Technicians use it to check forward voltage, average current, pin layout and mounting details when replacing output rectifiers in high-current power supplies. Verify the marking on the component and keep ratings equal or better on any substitute.
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.