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Z-Motor Assembly
The Z-motor assembly should also be replaced when the resistance between each of the phases is incon-
sistent or substantially different than 1.04±10%
Ω
for the short z-motor and 0.57±10%
Ω
for the long
z-motor. In addition, the resistance between each of the phase wires should be relatively consistent with
the other wires.
Figure 1 - Measuring Resistance Between Motor Phase Wires
Resistance of the z-motor phase wires can be measured at the connector with an Ohmmeter as shown in
Figure 1 above. Disregard the green (ground) wire and measure the resistance between each combination
of the other 3 wires.
Measuring resistance however, is not the only factor to be used in determining whether to replace a mo-
tor or not. Examples of other issues that should be considered is how freely and smoothly the spindle on
the motor turns. These factors are covered in the troubleshooting section of this manual.
Replacement Parts Needed:
• Z-Axis Brushless Servo Motor
• 6-11 inch Cable Ties (to re-tie the harnesses after installing the new motor) (available in the elec-
trical section at most hardware stores )
1. Turn the machine OFF.
2. Remove the left arm cover and the screw from the back of the right one.
3. Remove the upper arm back cover.
CAUTION!!
Use extreme care not to drop metallic objects, tools, or other conductive material
on the Main PCB when you have the base cover removed. If you drop such objects on the Main
PCB, it can severely damaged the electronics which will be very expensive to repair.
4. Remove the base cover.
5. Remove the lower arm rear cover.
Figure 2 - Z-Motor PCB Connections
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