Error message

HMS_0300_0600_0001_0003: The resistance of Motor-A is abnormal, the motor may have failed.
” The resistance of Motor-A is abnormal, the motor may have failed.”

What it is

There are several current sensors on the MC board of the printer to sample the current of the motor,when the printer is turned on each time, the resistance of the motor will be detected through the current sensor to determine whether the motor is broken.

This error is usually caused by excessive resistance due to the following reasons:

  1. the cable of the motor is loose
  2. the motor is broken
  3. the MC board is broken

Safety warning and Machine state before starting operation

Please turn off the printer and disconnect the AC cable during operation

trouble shooting guide

step 1 Check whether the cable of the motor is loose

please refer to this wiki to remove the rear cover of printer and check the MC board:

step 2 Check whether it is motor failure or MC board failure

Motor A is the same as motor B, but motor Z is different,so if  HMS reports “Motor-A/B is abnormal”(Assume that motor A is abnormal):

  1. turn off the printer and disconnect the AC cable;
  2. exchange the cable of motors A and B and turn on the printer;
  3. If the HMS still reports that motor A is abnormal, the MC board is broken; if the HMS changes to motor B is abnormal, the motor A is broken.

if  HMS reports “Motor-Z is abnormal”,please:

  1. turn off the printer and disconnect the AC cable;
  2. exchange the cable of motors Z and A and turn on the printer;
  3. export log(https://wiki.bambulab.com/en/p1/troubleshooting/how-to-upload-log) and contact after-sales team(It will still report error because the parameters of motor Z and motor A are different).

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