Job Packet / WeldKing / CoolArc200

Packet use

Use this packet when the complaint involves wrong 110 V or 220 V recognition, low OCV that may be state-related, VRD confusion, or light-and-fan with no real output.
Primary guide: CoolArc200 guide
Bench sheet: CoolArc200 bench test
Brand references: WeldKing local reference manifest, WeldKing fault-branch matrix

Intake snapshot

Item	Record
Serial or shop tag
Exact complaint
Input source used by customer
110 V or 220 V branch tested in shop
VRD mode expectation
Plug, adapter, and receptacle condition
Clamp and holder condition

Likely parts and accessories to stage

Item	Why stage it early
Known-good plug or adapter path	source-path faults are common on voltage-class complaints
Known-good clamp and holder set	eliminates return-path false faults before board work
Meter leads for J3 testing	input-sense checks are central on this model
Simple TIG kit if package requires it	only after stick proving is complete

Official parts-entry shortcuts

Use these after the branch tests prove the complaint follows the adapter, TIG-kit, or external current path.
Broad parts path: official CoolArc200 parts category
TIG welding kit 07003750: official product page
230 V to 125 V input adapter 07001825: official product page
Ground clamp 07000462: official product page

First branch decisions

If you see...	Stay in this branch first
J3 sense voltage wrong	main-board input-detect branch
Sense voltage correct but display wrong	control-board branch
Low OCV only in VRD behavior	normal state branch, not output failure
Blink-only display or no stable fan start	fan or support branch before control-board blame
Light and fan present but still no usable output	output or control branch after state logic is proven

Local files to open first

the J3 voltage-explanation PDF in assets/reference_doc/WeldKing/CoolArc200
the two circuit-diagram PDFs in assets/reference_doc/WeldKing/CoolArc200
the board-layout image in assets/reference_doc/WeldKing/CoolArc200

Bench workflow

Confirm actual input class before powering the machine.
Run the J3 and OCV checks from CoolArc200 bench test.
Prove stick baseline on clean steel and separate normal VRD or wake-up behavior from true no-output.
Re-power and confirm the machine does not drift back into wrong voltage recognition.

Release signoff

Check	Result
Correct voltage recognition proved	pass / fail
VRD or non-VRD behavior understood and normal	pass / fail
Stable output baseline restored	pass / fail
No heat at plug, adapter, clamp, or holder	pass / fail
Covers, grounds, and lead routing restored	pass / fail

Technician: __________ Date: __________