Archive for Apple PCB 820-3332 revision A, roughly 2 MB in size. The name lists only board number and revision, so the model and exact contents must be confirmed after unpacking; schematics are the usual payload. Apple prints the 820- part number directly on the logic board. Once matched, the drawings support tracing power rails, reviewing power-up sequencing, checking component values and locating test points when diagnosing no-power or no-boot faults.
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 @Mac_Shematic_Santale. 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.
7-ZipWinRARThe Unarchiver (macOS)