The stepper motor on my Mini’s extruder fails to do anything (not even a noise or wiggling). I unmounted the motor and tried to turn the shaft by hand as it was unmounted. It seems to be stuck, or at least there is more resistance than I can overcome with my bare fingers on the shaft (no pun intended). The x-/y-/z-steppers all work fine. I assume my printer is a Mini v1.03 on account of it not having connectors directly on the stepper and having bought it in Sept. of 2015.
Where do I begin to troubleshoot? Is there a way to test if signals/power get to the motor, e.g. using a multi-meter? Could it be a blown fuse, i.e. is the extruder motor fused in some way? I want to be sure it is the motor and not the driver board/wiring, before ordering a new one.
Also I couldn’t find instructions on replacing the EXTRUDER stepper. I only saw stuff on replacing the y-axis and x-axis steppers. It isn’t a problem, since the motor is reasonably easy to unmount, but some people might profit from detailed instructions. After all, there is one for replacing the wiper pad
I checked the cabling from stepper to board with the continuity tester of my multimeter. Cables should be okay. It’s either something on the board or the motor.