MigSonic145 Parts Substitution Card

This is the quick external-parts substitution card for the highest-value MigSonic145 gun, spool-gun, generation, and gas-side splits.

Use This Card When

Complaint branch	Swap first	If the complaint follows the part...	If the complaint stays with the machine...
weak or unstable base MIG weld	known-good NT-1 gun and consumables, then base-gun bare-wire feed with the tip removed	keep diagnosis in the gun or generation branch	move to support-power and control logic only after tip-removed proof stays with the machine
gas-shielded complaint only	known-good regulator and hose path	keep diagnosis in the gas branch	move deeper only if shielding is proven
one-gun-only failure	known-good base gun first, then known-good spool gun	keep diagnosis in the branch-specific accessory path	move to the machine only if both branches fail
click-cycling with normal external parts	keep external parts fixed and compare startup	keep diagnosis internal only after the external path is clean	stay in support-power branch

Stop if a known-good regulator or hose restores the weld.
Stop if the complaint follows one gun branch only.
Stop if tip-removed bare-wire feed is healthy and only the fitted tip, gun generation, or branch-specific hardware was bad.
Stop using the card and open the full guide if gun, gas, and clamp proving are already clean.