Turn the printer off.
Locate the heated bed heater connector on your controller board:
Rambo Mini heated bed heater connector (MK2, MK2S, MK2.5 and MK2.5S).
Rambo Einsy heated bed heater connector (MK3 and MK3S).
Unplug the heated bed heater from the controller board.
Turn the printer on.
Preheat the heated bed and extruder for PLA temperature through the Preheat menu of your printer.
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