P40 Measurement Card

This is the quick live-reading card for the highest-value P40 plasma start and support-supply splits.

Use This Card When

dry air and a clean torch stack
about 65 psi / 4.5 bar minimum air supply under flow, not just static regulator pressure
clean clamp and return path
starter cartridge or moving front-end piece moves freely
correct test point with the HF wire unplugged when checking machine-side OCV

Checkpoint	Where to measure or observe	Healthy expectation	If abnormal, keep diagnosis in...
Air supply under flow	regulator and airflow during an actual start attempt	about `65 psi / 4.5 bar` minimum while flowing	compressor, regulator, hose, or wet-air branch before electronics
HF strike-pole gap	striker gap at the HF section	about `1.5 mm`	gap, striker cleanliness, or torch-start branch before an HF-board call
HF PCB supply	support feed to the HF PCB	about `24 VDC`	support-power or control branch before the HF board itself
OCV test point	machine output with the HF wire unplugged from the torch-output branch	measured at the correct point so the reading reflects the machine, not the torch branch	wrong test point can create a false no-OCV diagnosis
Control or fan supply	low-voltage support branch	stays near `24 V`, not sagging toward `14 V` or rising toward `48 V`	switch-power branch rather than torch, clamp, or front-end faults

Use these only after the measurements prove the complaint follows the SG55 torch stack or consumable branch.
P40 accessories entry: official accessories path
SG55 electrode 07Y2517003: official product page
SG55 tip 07Y2517005: use the official P40 accessories path above.
Manual cross-check: official P40 owner manual

Stop and correct the torch stack, clamp, or air path first if the complaint clears there.
Stop and correct air supply first if pressure under flow drops below about 65 psi / 4.5 bar.
Stop and rebuild the torch front end first if the starter cartridge does not move freely.
Stop and clean or reset the HF gap first if no-HF is fully explained by the striker branch.
Stop using the card and open the full guide if HF behavior, OCV, and support voltage do not line up to one clean branch.