P40 No-HF Answer Key

Drill

• P40 no-HF drill

Correct First Proof Step

• prove fresh SG55 stack, clean clamp, dry air, and the correct OCV test point before internal opening

Acceptable Document Order

1. P40 measurement card
2. P40 parts substitution card
3. P40 board opening map only if the complaint still stays machine-side

Required Takeaways

• no-HF, HF-no-OCV, and air-no-cut must stay separated
• torch stack and support rail explain more complaints than the HF board
• measuring OCV at the wrong point creates false diagnosis

Failing Moves

• blaming the HF board before proving the striker gap and torch stack
• measuring at the wrong output point
• mixing control-branch and front-end complaints into one vague plasma failure

Passing Answer Summary

• A correct answer proves the torch stack and air path first, uses the measurement card to separate the support-voltage branch, and only opens the machine if the complaint remains clearly machine-side.