Hi
Error code F2 55 is a toner error. Make sure all the packing tape was removed from the toner, if a new toner was installed. Try and reseat the toner, and check plug-in sensor fixed with 2 screws on the rear side of the toner cartridge. Try to replace it with the one on the previous cartridge.
If this doesn’t resolve the issue then check the grid voltage, it may have happened due to low grid voltage. To check this you’ll need to check the power supply board of the machine for any disconnections or burnt components. Hope this helps... If it does please do not forget to accept the solution or post back for assistance.
Daniel
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