[https://remont-aud.net/ Remont-aud] - Russian website offering a collection of schematics, datasheets and firmware dumps.
[http://printer1.blogspot.com/ prinetr1printer1] - Collection of service manuals for printers and laptops
[https://www.informaticanapoli.it/manuali-di-servizio/ informaticanapoli] - Italian website that offers service manuals and schematics