Makeblock mBot - Part VII XY Plotter; XY Plotter stepper motor troubleshooting

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Part VII XY Plotter
Why the stepper motor doesn’t run or runs abnormal?
1. Make sure it is powered on with 12VDC and power switch is turned on.
2. Check if you have updated firmware. It is required to update firmware whenever switch
mDraw to Benbox and vice versa.