For detailed diagrams or specific error codes, you can refer to the official Canon Support Page or third-party instructional guides like those found on Printer Tales .
A factory reset will erase everything you have customized. This includes: Canon Mf4350d Reset To Factory Defaults
If a System Manager password was set and you don't know it: For detailed diagrams or specific error codes, you
When in doubt, print a "User Data List" before resetting (Menu → System Settings → Print Lists). This will give you a physical copy of all your speed dials and settings so you can re-enter them after the reset. This will give you a physical copy of
[Additional Functions] -> [2] -> [8] -> [Additional Functions]
If you see options like "Fix ADC" or "Laser Adjustment," do not touch them.
In that case, check your toner (genuine Canon Cartridge 112 or 113), the transfer roller, and the fuser assembly. Factory resets cannot fix worn-out gears or broken sensors.