Hypertherm Powermax65 SYNC - Replace the control PCB and the ribbon cable

Do System Tests to Identify Defective Components
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96 810430 Troubleshooting Guide Powermax65/85/105 SYNC
8. Install the DSP PCB, but disconnect the ribbon cable from J6 on the DSP PCB. Measure the
voltage again from pin 4 to ground. Is the voltage correct now?
 If yes, replace the control PCB.
 If no, replace the DSP PCB.
9. If all of the voltage measurements are correct but you continue to see the same fault code,
replace the power PCB.