MigSonic252S+SS20 Measurement Card

This is the quick live-reading card for the highest-value MigSonic252S+SS20 source-versus-feeder and spool-gun splits.

Use This Card When

the feeder is blamed but the source may still be bad
readouts freeze or behave strangely
the spool gun runs full speed or acts wrong

Prove First

correct feeder interconnect seating
known-good base MIG gun before spool-gun proving
source-side controls before feeder blame

Fast Measurement Card

Checkpoint	Where to measure or observe	Healthy expectation	If abnormal, keep diagnosis in...
Source readouts at startup	source display behavior	stable and sensible	source-side control branch
Solenoid at power-up	gas behavior on startup	not stuck open	source-side power PCB branch
Feeder at idle	motor behavior with no command	stopped until command	interconnect or source-control branch
Spool-gun branch	compare base MIG to spool gun	base MIG proves first, spool-gun fault stays isolated	spool-gun connection and drive-roll branch

Official Parts Shortcuts

Use these only after the readings prove the complaint follows the external spool-gun or feeder-side accessory branch.
MigSonic252 parts category: official parts path
SpoolKing24D spool gun 07NS1000: official product page
Spool-gun drive roll 07NS1007: official product page

Stop Rules

Stop and keep the fault in the source first if source readouts and controls are already abnormal.
Stop if the complaint follows only the spool-gun branch.
Stop using the card and open the full guide if source, feeder, and spool-gun paths still conflict.

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