Power and volume key circuit from the Samsung Galaxy A02s (SM-A02S) schematic, saved as a 3.70 MB PDF. It shows the side key connections, the power key line to the PMIC and the volume up and down lines with their protection parts. Use it when the phone will not power on from the button, restarts by itself or volume keys do nothing, tracing continuity from switch to chip. Compare with the board under repair and confirm the variant matches before trusting 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 @phoneSchematics. 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.