WelderData diagnostics

Welding-machine diagnostic routes

Start from the visible symptom, then move into the related board, circuit, component or chip reference. These pages are organized for repair technicians who need a practical sequence, not a pile of unrelated documents.

Repair paths by machine family

Use these entry cards when you know the machine family or failure type but not the exact board page.

CO2 / MIGNBC / CO2-MIG wire-feed pathNo wire feed, wire feeds continuously, gas valve issues, burn-back timing and TL494/TL598 PWM checks. ZX7 / WSInverter protection pathProtection light on, no output, weak output, feedback line, thermal switch, 24V and drive-enable routing. WS TIGNo gas / no HF / no arc pathWS-200P / WS-200S bottom-board, upper-board, middle-board and start-sequence routing. HF startTIG HF arc-start pathGas but no HF, weak HF, HF relay click with no spark, discharge resistor, spark gap and HV diode checks. WSM-315TIG control pathGas, HF, main current, panel controls, foot pedal, pulse, post-flow, feedback and protection routing. WSE AC/DCSecondary inverter pathDC works but AC fails, one-sided AC output, balance not working, secondary driver and secondary inverter diagnosis.

NBC CO2/MIG wire-feed diagnostics

Mechanical feed, torch command, 24V supply, PWM control, motor output and burn-back behavior.

NBC MIG no-wire-feed diagnosisMechanical path, torch input, 24V, PWM and motor-output evidence order. NBC MIG wire feeds continuouslySeparate stuck command logic from shorted motor output hardware.

ZX7 / WS inverter diagnostics

Protection lamp, false feedback, thermal shutdown and inverter drive-enable paths.

ZX7 / WS protection light on, no outputSeparate real power-stage protection from false feedback or thermal shutdown. ZX7 / WS feedback and drive pathTrace feedback, protection, thermal input and drive-enable evidence.

WS TIG gas, HF and arc-start diagnostics

Start-sequence diagnosis for TIG machines with missing gas, missing HF or no arc transfer.

WS TIG no gas / no HF / no arc routingStart from the first missing action: torch, gas, HF, inverter drive or arc transfer. TIG HF arc-start weak or missingGas but no HF, relay click with no spark, weak HF, HF stuck on and no arc transfer.

WSM-315 TIG start diagnostics

Pulse TIG control, panel command, foot pedal, HF start, gas and feedback diagnosis.

WSM-315 no HF / no arc fault routingDiagnose by the first missing action: gas, HF, main current, pedal response or protection. WSM-315 gas, HF and feedback pathConnect torch input, gas timing, HF command, main output and feedback cutoff.

WSE AC/DC TIG secondary inverter diagnostics

AC mode diagnosis for machines where DC output works but AC output is missing or abnormal.

WSE AC/DC TIG secondary inverter fault routingDC works but AC fails, AC one-sided waveform, balance not working and repeated secondary-device failure. WSE secondary inverter and driver signal pathPanel AC command, secondary driver, polarity switching, balance, feedback and protection.

If DC mode works normally but AC mode fails, do not start from the main inverter. Compare AC/DC command, secondary driver, secondary inverter devices, balance command and output feedback first.