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1. When the machine is off, push the axis by hand. If it is very difficult to move the axis then:

   check

   1. Check the lead screw, axis alignment, coupler, or band drive, and contact Micro-Vu support.

2. Put Turn the machine in on and press the E-Stop and push . Push the affected axis manually. Compare the feel to when the machine is in standbyby hand. Strong braking should be felt when the E-Stop is pressed. Turn the machine is in E-Stop compared to in standby. If the braking on and release the E-stop and place the machine on Standby. Push the affected axis by hand. Braking should be weak compared to strong braking felt when the E-stop is pressed. Compare the braking between both scenarios. If braking when the E-stop is pressed is weak (compare to the working axis), or intermittent, then one of the following has a hardware issue:

   1. Motor Cable

   2. Motor

   3. Amplifier Board

3. When the machine is running and idle, push the affected axis. It should serve to resist motion. If the axis is very easy to push, then one of the following has a hardware issue:

   1. Motor Cable

   2. Motor

   3. Amplifier Board

   4. The cable between the Logic Board and Amplifier Board

   5. Logic Board

4. If clearing the Stall Fault causes another axis to jump (attempt to move): The motor or encoder cables are mixed up between the axis.

   1. Push the axis and watch whether the encoder values (LinPosScr) in MotorScope

   correspond correctly.

5. Put the machine in E-Stop and unplug each motor cable in turn to make sure that the braking corresponds correctly.

If the Stall Fault stops occurring with certain motors disconnected:

There is a short somewhere in the motor, cable, or Amplifier Board:

With the machine off, check for electrical continuity between the motor leads and the chassis of the machine. It should be an open circuit.

If not, there is a short. Unplug the machine immediately and contact the Micro-Vu support!

1. count in the correct axis.

6. If the axis continues to jump (attempt to move) and #4 is not occuring, then verify that the overcurrent LEDs (shown on the Image 1) on the Motor Amplifier board are not red. If any overcurrent LEDs on the Motor Amplifier board are red, then there is likely an electrical short and the following items might be defective:

   1. Cable between motor and Amplifier board

   2. Amplifier board

   3. Motor

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