Bench Test / WeldKing / MultiSonic220

Test intent

Confirm the machine is not trapped in debug, reset, or control-state fault.
Separate MIG-only faults from a healthy shared power source.
Prove stable wire feed, display behavior, and process changeover after repair.

Tools and setup

Digital multimeter
Clean steel coupon
Known-good work clamp
Plain-steel MIG wire and simple torch baseline
Dry electrode and simple TIG torch only after MIG or stick baseline is proven

Pre-power checks

Check	Expected condition	Result
Polarity connector	tight and correct for active process	pass / fail
2T or 4T state	normal startup expectation confirmed	pass / fail
Ribbon and panel seating after service	no loose panel-side connectors	pass / fail
Wire path baseline	tip removed and wire path spins free	pass / fail

Electrical and control checkpoints

Checkpoint	Expected value or behavior	Record actual
Panel at startup	stable, no all-lights-flashing behavior
Feeder motor at idle	stopped until trigger command
Meter response during live test	changes with process and output, not pinned or frozen
MIG-only branch with stick or TIG still healthy	polarity connector and MIG control branch proveable before shared power section is blamed

Functional proof

Test	Pass condition	Result
Normal startup	no debug trap, no PRO10-style abnormal behavior	pass / fail
MIG trigger feed	wire feeds only on command and stops cleanly	pass / fail
MIG arc test	stable short weld with normal feed and display behavior	pass / fail
Stick test	stick baseline remains healthy	pass / fail
TIG test if equipped	simple TIG branch works after MIG and stick are proven	pass / fail
Re-power stability	no full-speed feeder on restart and no self-shutdown	pass / fail

If it fails

No feed but machine otherwise healthy: clear debug or state traps first.
All lights flashing: stay in ribbon, control, or support-power branch.
Stick or TIG good but MIG dead: stay in polarity connector and MIG-only branch.
Full-speed feeder at power-up or self-shutdown: stay in power-board or support-power branch.

Direct official parts pages

Use these only after the fault has already been proven to follow an external torch, pedal, spool-gun, or kit branch.
MultiSonic220 parts category: official MultiSonic220 parts path
Aluminum spool-gun kit XOM99035: official product page
SpoolKing 24DL spool gun 07NS1010: official product page
PRO17 TIG torch WAT31100: official product page
FC25-HD foot pedal 07002510: official product page

Post-repair release

Signoff item	Result
Process changeover behaves normally	pass / fail
MIG baseline restored	pass / fail
Secondary process baseline restored	pass / fail
No abnormal display or feeder behavior after power cycle	pass / fail

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