Page Comparison

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1. Power off the machine.

2. Examine the data cable at the machine control board and the axes drivers.

   1. Machine control board: J6 (26 pin IDC ( ribbon cable); J6

   2. Stepper driver controllers: 10 pin IDC (ribbon cable)

      1. J6-1 - J6-6 (X-axis)

      2. J6-7 - J6-12(Y-axis)

      3. J6-13 - J6-18 (Z-axis)

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1. Power off the machine.

2. Verify that the wires and cables are in their original position.

3. Swap the ribbon cables between the malfunctioning stepper driver controller and a known good stepper driver controller.
   The controls on the machine change, depending on the ribbon cables you swapped.

4. Jog the malfunctioning axis in both directions.

   1. If the malfunctioning motor now functions properly: It is likely the ribbon cable or control board are malfunctioning.

   2. If the malfunctioning motor continues to move erratically: Continue to the next troubleshooting topic; but, it is likely that the malfunctioning axis motor is defective.

Inspect the DC

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-Bus board

1. Power on the machine and take it out of reset.

2. Examine the green LED on the DC-BUS board.

   1. If the green LED is not illuminated: Go to All Axes Won't Move When Commanded - PCNC 1100

   2. If the green LED is illuminated: Continue to the next step.

3. Power off the machine.

4. Remove the cover from the DC-BUS board.

5. Using the table below, locate the corresponding axis fuse and measure its resistance across the fuse with a digital multimeter set to resistance.

   1. Replace the fuse if the digital multimeter reads OL, shows a resistance in the MΩ, and/or doesn’t produce continuity tone.

   2. If the fuse measures 0-5 Ω, reinstall it.

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