Schematic for the Z84FM board variant, supplied as an 899-900 KB PDF without brand or revision details in its name. The FM suffix distinguishes it from the plain Z84F drawing, although the name does not say what the difference is. Use the sheets to follow the power-on sequence, measure rails at the indicated test points and identify the controller responsible for a short to ground. Any PDF viewer opens it, and searching for net labels speeds up diagnosis. Check that the PCB code exactly matches Z84FM before swapping parts based on these pages.
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.