xBuddy status LEDs (MK4, MK3.9)

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The main board on the Original Prusa MK4 and MK3.9 is the xBuddy board. The xBuddy board has ten status LEDs. 

Error lights

MMU overcurrent

The MMU overcurrent light indicates that the current through the MMU port is higher than 3.6 A.

Print USB overcurrent

The print USB overcurrent light indicates that the current through the print USB port (---) is higher than 0.5 A.

Heater fault

The heater fault light indicates an overcurrent through the hotend heater, higher than 2.8 A. 

Current fault

The current fault light indicates an overcurrent through the whole printer, higher than 15.5 A. 

Service USB overcurrent

The service USB overcurrent light indicates that the current through the service USB port (---) is higher than 0.5 A.

Status lights

Model Fan act

The print fan cools the printed model as it lies on the print surface. The associated LED indicates that this is active and spinning. 

Heatsink fan act

The heatsink fan cools the hotend components, including the heatsink. The associated LED indicates that this is active and spinning. 

Heater act

The hotend heater light indicates that current is flowing through the hotend heater. During a temperature rise, the light is fully on, while at a stable hot temperature, it is expected to blink. 

Main power

The main power LED indicates the presence of the needed voltage for the xBuddy to operate, 3.3 V. 

Heatbed act

The heatbed light indicates that current is flowing through the heatbed. During a temperature rise, the light is fully on, while at a stable hot temperature, it is expected to blink.