Samsung SM-A21s fingerprint reader schematic, delivered as a 3.82 MB PDF. The page documents the fingerprint sensor circuit, generally the connector, supply and communication lines toward the processor. It helps when the sensor is missing in settings or does not respond: check the supply at the connector, look for damaged filter parts and trace the signal lines for breaks. Open it with a normal PDF viewer. Verify the board is from an SM-A21s before using the designators shown.
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.