When spindle failed to stop/rotateUpdated a day ago

This article lists out the key steps to troubleshoot the spindle faulty problem. Please download the PDF with pictures for detailed testing steps: 

I. Spindle Fails to Stop (Continuous Rotation)

- Symptom: Spindle continues running after power-on and cannot be switched off.  

- Root Cause: Damaged relay on control board (loss of switching control).  

- Solution:  

    1. Immediately POWER OFF the entire machine.  

    2. Replace the control board.  

II. 60W Spindle Not Rotating (Masuter Pro, Masuter 3) 

Troubleshooting Steps:   

1. Basic Checks  

   - Toggle the mode switch to “Spindle”.  

   - Enable spindle in software, confirm relay "click" sound.  

2. Spindle Voltage Test (Multimeter: DC 20V range)  

   - Red probe → Spindle red wire; Black probe → Blue wire.   

   - If 12V detected → Spindle motor damaged. Replace spindle.  

   - If 0V detected → Proceed to next step.  

3. Controller Box Voltage Test

   - Measure voltage at the spindle output port (red/black wires - zero/live wire).  

   - If 12V detected → Spindle cable open circuit. Replace spindle wire.  

   - If 0V detected → Control board power module damaged. Replace control board. 

III. 400W High-Power Spindle Not Rotating (Masuter 3S, XE-PRO, Vasto, CL-4X4)

Troubleshooting Steps:   

1. Basic Checks  

   - Rotate the speed knob to MAX position; Toggle mode switch to “Spindle”.  

   - Enable spindle in software, confirm relay "click" sound.  

2. Spindle Voltage Test (Multimeter: DC 200V range)

   - Red probe → Red wire; Black probe → Blue wire.  

   - If 48V detected → Spindle motor damaged. Replace spindle.

   - If 0V detected → Proceed to next step.  

3. Controller Box Port Voltage Test  

   - Measure spindle port’s output port (left zero, right live wires).  

   - If 48V detected → Spindle cable damaged. Replace spindle wire.   

   - If 0V detected → Open the controller box for further checks.  

4. Control Board Output Test  

   - Measure voltage at right-side green terminal on control board.  

  - If 48V detected → Fault in board-to-aviation-plug wiring or desoldered plug. Replace the aviation plug and wire.  

   - If 0V detected → Proceed to next step.  

5. Control Board Input Test  

   - Measure voltage at left-side green terminal on control board.  

   - If 48V detected → Control board damaged. Replace control board.  

   - If 0V detected → Proceed to next step.  

6. Power Supply Output Test  

   - Measure voltage directly at power supply’s 48V output port.  

   - If 48V detected → Damaged PSU-to-board cable. Replace cable.   

   - If 0V detected → Check potentiometer (the speed knob).  

7. Potentiometer Test (Multimeter: 20kΩ range)

   - Measure resistance between red/black wires:  

   - Knob at MAX → Normal: 0Ω  

   - Knob at MIN → Normal: ≈4.7kΩ  

   - Fixed 4.7kΩ at all positions → Potentiometer damaged. Replace speed knob.

** Critical Notes  

1. Safety First: Always power off before inspections (except voltage tests).  

2. Tools: Digital multimeter required.  

3. Sequential Diagnosis: Follow steps strictly to avoid misdiagnosis.  

Please send order ID + machine model + problem + test results to below e-mail: [email protected]

We will arrange the replacements for your based on the test results.