Service schematic for the Nokia 206 feature phone in a 1.66 MB PDF, with a website tag appended to the file name. No board number or revision is stated, so compare the PCB markings with the document before relying on component references. A schematic for a phone like this is used to trace the battery and charging path, find the power management chip and follow keypad, display, audio and SIM lines when a handset will not switch on or charge. It opens in any PDF viewer and supports text search.
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 @mobileshematic. 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.