Bench Test / WeldKing / MigSonic252S+SS20

Test intent

Separate power-source faults from remote-feeder and spool-gun connection faults.
Confirm stable readout behavior, jog and purge control, and healthy base MIG output after repair.
Prove whether the complaint follows the feeder package, spool-gun branch, or shared power source.

Tools and setup

Digital multimeter
Clean steel coupon
Known-good work clamp
Known-good base MIG gun and consumables
Spool gun only if the complaint is branch-specific

Pre-power checks

Check	Expected condition	Result
Feeder package and interconnect	fully seated and undamaged	pass / fail
Gun, liner, and tip baseline	clean and matched to wire size	pass / fail
Source-side controls	jog, purge, and mode controls move normally	pass / fail
Spool-gun connection if fitted	correct connector and no miswire condition	pass / fail

Electrical and control checkpoints

Checkpoint	Expected value or behavior	Record actual
Source readouts at startup	stable, not frozen or nonsensical
Feeder motor at idle	stopped until command
Jog and purge control	respond from the power source, not the feeder
Spool-gun branch	not full-speed or unstable unless connection is wrong

Functional proof

Test	Pass condition	Result
Stable startup	no stuck-open solenoid and no frozen display behavior	pass / fail
Base MIG trigger feed	starts only on command and stops cleanly	pass / fail
Short MIG weld	stable weld with normal readout response	pass / fail
Feeder package proving	complaint clearly follows or does not follow feeder package	pass / fail
Spool-gun proving if required	one-gun-only problem stays on that branch	pass / fail

If it fails

Solenoid open at power-up: stay in source-side power PCB branch.
Frozen readouts: stay in source-side control branch, not feeder PCB branch.
Spool-gun full-speed feed: stay in spool-gun connection and spool-gun drive-roll branch.
Remote feeder suspected but source controls are abnormal too: keep the fault in the power source first.
Jog or purge abnormal at the source: keep the diagnosis in source-side controls before blaming the feeder package.

Direct official parts pages

Use these only after the complaint has already been proven to follow the external spool-gun or feeder-side accessory branch.
MigSonic252 parts category: official MigSonic252 parts path
SpoolKing24D spool gun 07NS1000: official product page
Spool-gun drive roll 07NS1007: official product page

Post-repair release

Signoff item	Result
Stable startup restored	pass / fail
Base MIG baseline restored	pass / fail
Source readouts plus jog and purge behave normally	pass / fail
Feeder package behaves normally	pass / fail
No stuck solenoid, frozen readout, or full-speed feed after power cycle	pass / fail

Technician: __________ Date: __________ Serial or shop tag: __________