CoolArc160 Measurement Card

This is the quick live-reading card for the highest-value CoolArc160 splits.

Use This Card When

OCV is low or absent
the fan slows, stops, or behaves abnormally
the arc dies after a short run

Prove First

correct branch power and plug condition
clean clamp and current path
correct fitted fan revision and connector location for the machine generation

Fast Measurement Card

Checkpoint	Where to measure or observe	Healthy expectation	If abnormal, keep diagnosis in...
High-voltage bus	`CN101` from capacitor PCB to inverter PCB	roughly `300 to 340 VDC` on a healthy high-line machine	capacitor PCB or primary-rectifier branch if bus is low
Auxiliary fan supply	`CN108` or `CN104`, depending on board revision	`24 VDC` with the correct polarity for the fitted revision	capacitor-board support path and early fan-polarity revision branch
OCV with healthy bus already proven	machine output	healthy OCV and normal strike behavior	capacitor PCB first if OCV is low around `30 V`; inverter PCB if bus is healthy but OCV is absent
Fan behavior under light weld load	live observation	fan stays stable and the arc does not extinguish as the fan slows	auxiliary-supply or capacitor-board branch

Official Parts Shortcuts

Use these only after the live readings prove the complaint still follows the external current path, fan-harness revision, or TIG-kit branch.
CoolArc160 parts category: official parts path
TIG kit 07003650: official product page
Ground clamp 07000461: official product page
Electrode holder 07000460: official product page

Stop Rules

Stop and correct the revision mismatch first if the fan connector location or polarity does not match the machine generation.
Stop and fix the current path first if clamp or Dinse heating explains the complaint.
Stop using the card and open the full guide if bus voltage is healthy but the symptom does not match the OCV branch.

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