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
1. Remove the control-side panel from the plasma power supply to get access to the 24 VDC power
supply component.
2. Use a digital multimeter to measure for 24 VDC (±2 VDC) across the positive (+) and negative (-)
terminals of the power source.
3. If the voltage is more than or less than the ±2 VDC limit, replace the 24 VDC power supply.
4. 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 PCB, J1 pin 1 and
pin 3.
5. If there is no voltage on J1 pin 1 and pin 3, examine the red and white wires.
6. If the wires are good, replace the control PCB in the plasma power supply.
Diagnostics and Troubleshooting
8
380
811530 Instruction Manual XPR460
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