MAG211 Parts Substitution Card

This is the quick external-parts substitution card for the highest-value MAG211 chart, gas-solenoid, spool-gun, and drive-roll splits.

Use This Card When

Complaint branch	Swap first	If the complaint follows the part...	If the complaint stays with the machine...
rough arc on base MIG	known-good base MIG gun and chart-correct plain-steel baseline	keep diagnosis in gun, front-end, or setup branch	move to ripple and power-side logic
feed is healthy but gas behavior is still wrong	simplify to known-good base gun, chart-correct plain-steel, and gas-side baseline	keep diagnosis outside deeper board blame until the simple path is proven	move to solenoid or control logic only after the external path is ruled out
aluminum-only or one-gun-only failure	known-good spool gun and matching drive roll	keep diagnosis in spool-gun and drive-roll branch	move back to the machine only if base MIG also fails
erratic feed quality	correct drive-roll family and plain-steel wire baseline	keep diagnosis external and mechanical	move to feed-control branch only after the path is proven

Stop if chart correction or a known-good base gun restores arc quality.
Stop if the complaint follows only the spool-gun branch.
Stop if chart-correct plain-steel base MIG is healthy and only the spool-gun or aluminum branch still fails.
Stop using the card and open the full guide if gas, feed, and arc branches still overlap after external proving.