Apple iPad Air 1 archive in RAR format, about 1 MB. Only the model is named, so the archive may hold a schematic, boardview or both; check after extraction. Such documents help a technician trace charging and backlight circuits, locate the PMIC and its support parts, measure test points and find shorted components on the logic board. Boardview files open in viewers like OpenBoardView or FlexBV. Confirm the board corresponds to the first-generation iPad Air, Wi-Fi or cellular, before trusting part locations.
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 @cyberlanelectonik. 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.