The switch tube (also called MOSFET) is used as an electronic switch on the toolhead TH board to control the power supply and rotation of the extrusion motor. When the switch tube is short-circuited, the extruder motor will not work.
New TH board
H2.0 Allen key
H1.5 Allen key
After disconnecting the printer power, refer to Replace H2D Extruder Connection Board/TH Board/FPC Cable to replace the TH board.
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