Fault route
ZX7-160/200 Fan Runs but No Arc Output Diagnostic
A compact ZX7 route for machines where the fan runs but welding output is missing.
Quick Answer
Fan operation proves some auxiliary supply is alive, but it does not prove inverter switching or secondary output. Separate drive permission, main transformer, output rectifier diodes, shunt feedback and output terminal connection.
Diagnostic path
Fan runs → auxiliary supply present → drive permission → main transformer → output diodes → reactor/shunt → output terminals.
Evidence table
Fan runs: not a total no-power fault. No drive: top-board control/driver layer. Drive exists but no output: transformer/output diode path. Output weak or unstable: reactor, shunt, feedback or cable connection.