Memory card slot section of the Samsung SM-A11 schematic, a PDF of 4.33 MB. The sheet covers the microSD connector, its supply rail, card detect signal and the data and clock lines with their series resistors and protection components. Use it when the phone does not recognise SD cards, checking supply voltage at the slot, continuity of each line and possible shorts to ground. Any PDF reader opens it; confirm the PCB revision first, since component designators may differ between board versions.
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.