Bench Test / WeldKing / CoolArc160

Test intent

Confirm whether the machine failure is still present after repair.
Separate capacitor-board and auxiliary-supply faults from inverter-board faults.
Verify that stick and lift-TIG baselines are both usable before release.

Check	Expected condition	Result
Input cord, plug, and branch	no heat damage or loose fit	pass / fail
Clamp and holder path	tight Dinse connection and clean contact surfaces	pass / fail
Fan wiring revision	connector identified correctly for the fitted board revision	pass / fail
Accessory setup	stick baseline first, TIG added only after stick passes	pass / fail

Checkpoint	Expected value or behavior	Record actual
CN101 high-voltage bus	about 300 to 340 VDC
CN108 or CN104 fan branch	about 24 VDC with correct polarity for fitted revision
OCV at output studs	healthy stick-ready OCV; if it sits around 30 V with healthy bus, stay in the capacitor-board branch
TIG start current on simple lift-TIG baseline	roughly 20 to 30 A

Test	Pass condition	Result
Power-up stability	fan starts and stays stable, no abnormal blink or collapse	pass / fail
Stick hot start	repeated starts on clean steel without difficult strike	pass / fail
Short stick weld	arc holds without fan slowdown or sudden extinguish	pass / fail
Lift-TIG start	tungsten does not stick and start current feels normal	pass / fail
Warm restart	machine repeats the above after brief warm-up	pass / fail

Low bus voltage with correct branch power: stay in capacitor-board or primary-rectifier diagnosis.
OCV around 30 V with healthy bus: stay in capacitor-board diagnosis first.
Healthy bus but no OCV: stay in inverter-board diagnosis.
Fan slows and arc dies: stay in auxiliary-supply or capacitor-board branch.
Lift-TIG sticks with high measured start current: stay in control or calibration-sensitive branch.
Stick healthy but lift-TIG still fails: stay in the external TIG-kit or start-current branch before reopening the machine.

Use these only after the failure has already been proven to follow an external lead, clamp, holder, or TIG-kit branch.
CoolArc160 parts category: official CoolArc160 parts path
TIG welding kit 07003650: official product page
Heavy-duty ground clamp 07000461: official product page
Heavy-duty electrode holder 07000460: official product page

Signoff item	Result
Basic stick baseline restored	pass / fail
Lift-TIG baseline restored if required	pass / fail
No abnormal heating at plug, clamp, or holder	pass / fail
Machine returned with correct lead and accessory setup	pass / fail

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