PDF schematic for a board identified only as Z65. The name gives no brand, model or revision, so check the code printed on the PCB to make sure the document applies. At 1.57 MB it should include most of the circuit sheets. Use it to trace voltage rails, follow the power-up sequence from standby to main power, see where signals run between components, and identify parts on a shorted line. A standard PDF viewer with text search makes it easy to jump to particular net names or reference designators.
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 @CLRINDORE. 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.