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Board and component entry

Boards & Chips

Find a repair reference by board function, PWM controller, IGBT driver, auxiliary supply or feedback component.

PWM controllers

Use the controller IC when supply, timing, shutdown or PWM evidence is already known

UC3846 / KA3846Dual-output current-mode PWMSG3525 / SG3525AOscillator, soft-start and dual outputsKA3845 / UC3845Auxiliary supply controller

IGBT driver modules

Isolate logic-side control from gate-side power and protection

M57962ALIGBT driver, fault and gate outputMOSFET / IGBT driver boardsBoard families and branch checksZX7-250 gate-drive pathTransformer and branch comparison

Control boards

Find PWM, protection, current command and auxiliary rails on the control PCB

UC3846 control boardsController and shutdown pathSG3525 control modulesTiming and output stagesZX7-250 control / driver boardModel-specific board reference

Auxiliary power boards

Start here for dead machines, missing relays, missing fans or no 24 V

KA3843 / KA3845 boardsStartup and local supplyAuxiliary power circuitFunctional pathNo 24 VSymptom entry

Process boards

Use the process-specific board when the main inverter is already operating

Wire-feeder boardsMIG motor and speed controlHF arc-start boardsTIG and plasma ignitionMIG wire-feed controlCommand and feedback path

Power devices and feedback

Check devices around the controller rather than replacing the IC first

IGBT / MOSFET / diodePower-stage device referencePC817 optocouplersIsolation and feedbackLM324 / LM358Comparator and control loops