Samsung SM-M307F service manual section, 1.41 MB PDF; the Direy part of the name is unclear and its exact chapter content is not stated. It belongs to the Galaxy M30s documentation set together with the specification, troubleshooting and parts chapters. Open it in a PDF viewer to see what it covers, and use it in combination with the other sections. Confirm the model code on the handset label matches before relying on any figures or references inside.
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 @mobile_jump2. 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)