Archive for the OPPO A37 smartphone in RAR format, 1.52 MB. No board number, revision or document type appears in the name, so the actual contents remain unknown until unpacked with WinRAR, 7-Zip or a similar extractor. A file of this size typically contains schematic pages or a component placement diagram for the phone mainboard. Technicians use these to follow charging, display and battery circuits and to find measurement points, but should first confirm the board variant inside the device matches the documentation.
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 @SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.