On stepper motors, disregard the green (ground) wires going into the connector and measure the resistance of the servo motor by pushing the leads of the ohmmeter into the connector until they contact the pins as shown in Figure 1 above.
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IMPORTANT: Set the multimeter to the ohm scale and zero it out by touching the two leads together and pushing the reset button. If the meter you are using does not have a reset button, take note of the resistance measured when the two leads are touched together and subtract that from the actual measurement to get the true resistance measurement. |
If the resistance is zero ohms or close to it, it indicates the motor has a short. If the measurement is high, it indicates a break in the circuitry of the motor. Measure the resistance between each of the phase (non-green) wires.
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Servo Motor |
Resistance Specification |
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X-Motor |
3.4Ω |
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Y-Motor |
3Ω |
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Old Z-Motor (30622) |
1.1Ω |
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New Z-Motor (31260) |
0.6Ω |
