WelderDataSearch

Start from the PCB function or device marking

Boards and chips

Use this entry when the machine is open and you can identify the board function, controller IC, driver module or feedback device.

Fast starting points

Open the route that best matches the evidence already available.

UC3846 / KA3846

Check supply, timing, shutdown, current sense and A/B outputs.

Open this route →02

KA3845 / UC3845

Diagnose startup VCC and auxiliary-supply switching.

Open this route →03

M57962AL driver

Separate logic input, isolated supply, fault output and gate drive.

Open this route →04

ZX7-250 driver/control board

Follow local rails, pulse transfer and driver branches.

Open this route →

PWM and auxiliary-supply controllers

Use the device marking when supply, timing, reference or output behavior is already being measured.

PWM controllerUC3846 / KA3846Current-mode controller with dual outputs and shutdown input.PWM controllerSG3525 / SG3525AOscillator, soft-start, shutdown and dual-output checks.Supply controllerKA3845 / UC3845Auxiliary-supply startup and no-24V diagnosis.PWM controllerTL494 / TL598Wire-feeder PWM and speed-control reference.

IGBT drive and power-stage references

Separate logic command, isolated driver supply, gate waveform and power-device condition.

Driver moduleM57962ALFault output, isolated supply and gate-drive checks.Gate driverHCPL-316JIsolated gate drive, desaturation and fault behavior.Board familyMOSFET / IGBT driver boardsBoard-level driver families and branch comparison.Power deviceIGBT / MOSFET / fast diodePower-stage device identification and basic checks.

Control and auxiliary-power boards

Board references for PWM control, shutdown, low-voltage rails and driver power.

Control boardUC3846 control boardsController supply, shutdown and output path.Control boardSG3525 control modulesTiming, soft-start, feedback and output stages.Auxiliary boardKA3843 / KA3845 supply boardsStartup resistor, VCC, switch and secondary rails.Model boardZX7-250 driver and control-power boardLocal rails, pulse path and gate-driver checks.

Process, feedback and protection boards

Use these when the main inverter works but wire feed, HF start or feedback remains faulty.

Process boardWire-feeder boardsMotor output, speed control and trigger interfaces.Process boardHF arc-start boardsTIG and plasma high-frequency generation.Feedback ICLM324 / LM358Current, voltage and protection signal conditioning.Isolation devicePC817 optocouplersFeedback isolation and control transfer checks.

Next step

Not sure what the board does?

Start from the machine symptom or model, then return here once the affected function is identified.

FaultsFind the symptom groupUse the visible behavior to locate the likely subsystem.ModelsOpen the machine familySee known board stacks and model-specific routes.WorkflowsFollow a measurement sequenceMove from power-off checks to board-level isolation.