Troubleshooting for high voltage on the 24 V power supply
Diagnostic code 784
Diagnostic code 784 occurs when the voltage on the 24 V internal power supply component is too high.
Symptoms
| Code | Symptoms | XPR® models | XPR action | Code cancels with... |
|---|---|---|---|---|
| 784 | The 24 VDC bus is more than 28 V. | All models | Ramp down | None |
Corrective action
- Remove the control-side panel from the plasma power supply to get access to the 24 VDC power supply component.
- Use a digital multimeter to measure for 24 VDC (±2 VDC) across the positive (+) and negative (-) terminals of the power source.
- If the voltage is more than or less than the ±2 VDC limit, replace the 24 VDC power supply.
- If there is 24 VDC (±2 VDC) across the positive (+) and negative (-) terminals of the power supply and the 784 diagnostic code continues, look for 24 VDC (±2 VDC) on the control Printed Circuit Board (PCB), J1 pin 1 and pin 3.
- If there is no voltage on J1 pin 1 and pin 3, examine the red and white wires.
- If the wires are good, replace the control PCB in the plasma power supply.