Start by known machine model

Welder Models

Use Models when you already know the machine type or model family. A model hub should connect the user to related diagnostics, boards, circuits, measurement points, components, chips, repair cases and tools. It is the best entry when the technician has a machine name such as LGK100L, MIG200DL, CT-312, ZX7-160/200, WSM-315 or WSE AC/DC TIG.

Start here by machine type

Choose the machine family first. If the model is unknown, start from Faults by visible symptom instead.

Plasma

LGK plasma cutters

For LGK60L and LGK100L gas, fan, protection, no-output, IGBT and weak-current routes.

MIG / CO2

MIG200DL and CO2-MIG welders

For trigger, gas, wire-feed, fan/display, breaker and welding-current symptoms.

MMA / Stick

ZX7-style small inverter welders

For compact inverter board-stack, no power, relay startup, protection and MOSFET/output-diode faults.

TIG / AC-DC TIG

WSM, WSE and TIG control families

For 2T/4T, gas timing, HF arc start, foot pedal, current control, pulse and AC/DC balance.

How this section relates to other sections

Models are machine hubs. Faults are generic visible-symptom entries. Diagnostics are step-by-step workflows. Boards and Circuits explain board functions, connector evidence and signal paths that the model pages link to.

Plasma cutters

Use these when the known machine is an LGK-style plasma cutter or a plasma mode in a combo unit.

LGK60L Plasma CutterFan, gas, O.C light, HF board, main control board and trigger routes. LGK100L Plasma CutterNo response, display, protection, no output, breaker trip, IGBT and weak current. LGK-100 Air Plasma CutterModel reference for LGK-100 plasma-cutter no-arc and board-level routes. LGK Plasma Cutter Fault IndexShared LGK60L and LGK100L plasma fault navigation. LGK100L Control BoardX13, X7, X14 and protection/current feedback evidence. LGK Control Power RailsControl-power rail evidence for plasma cutter diagnosis.

MIG / CO2 welders

Use these when the known machine is MIG200DL, NBC/CO2-MIG or another wire-feed/gas-valve machine.

MIG200DL CO2 MIG WelderDisplay, fan, trigger, gas, wire-feed, breaker and current-fault hub. NBC-III Digital CO2 MIG WelderDigital MIG reference for control-panel and fault-code paths. MIG200DL Fault IndexSymptom routes for trigger, gas, wire-feed, no-output and breaker trip. MIG200DL Power / Control BoardP12, P6, P13, P14, P17, P11/P16 and P1/P2 connector evidence. MIG Wire-Feed / Gas-Valve ControlP13 trigger/jog, P14 feeder output and P17 gas output split. MIG200DL Power-On Breaker TripRectifier bridge, bottom-board capacitors and inverter-board burn evidence.

Stick / MMA inverter welders

Use these when the known machine is a ZX7-style stick welder or compact inverter MMA board stack.

ZX7-160/200 Small Inverter Stick WelderCompact board-stack model hub for bottom, top and middle board routing. ZX7-250 IGBT Inverter Stick WelderHigher-power ZX7 model reference with IGBT and driver-stage routes. ZX7-IV Digital Stick / TIG WelderDigital stick/TIG model family and control-panel evidence. ZX7-160/200 Repair IndexDead, relay click, fan/no output, weak current, protection and MOSFET routes. ZX7-160/200 Board StackBottom board, middle output board and top inverter board reference. Small Inverter Board-Stack MapGeneric board-layer map for compact inverter MMA machines.

TIG and AC/DC TIG welders

Use these when the known machine is WSM, WSE, WS, TIG or AC/DC TIG and the fault involves torch, gas, HF, current command or secondary inverter behavior.

WSM-315 DC Pulse TIG WelderPanel, control board, HF arc-start, timing and current-control hub. WSE AC/DC Pulse TIG WelderAC/DC mode, pulse, balance, secondary inverter and timing hub. TIG Welder Fault IndexGas, HF, 2T/4T, post-flow, current and remote-control symptom routes. WSM-315 Control Panel2T/4T, pre-flow, post-flow, start, upslope, crater and current settings. WSE Secondary Inverter BoardAC/DC TIG polarity switching, secondary driver and balance/pulse behavior. WS-250 Gas Click No OCV No HF CaseSG3525/CW3525 shutdown path and real repair evidence.

Combo machines

Use these for multi-process machines where MMA, TIG and plasma behavior must be compared before replacing the power stage.

CT-312 MMA / TIG / Plasma Combo WelderCombo-machine model entry for process-specific diagnosis. CT-312 Repair IndexMode comparison, board stack, gas/HF and shared protection routes. CT-312 Mode-Specific Fault RoutingSeparate MMA, TIG and plasma symptoms before board replacement. CT-312 Bottom BoardAuxiliary, relay, gas/fan/HF socket and support layer. CT-312 Middle BoardTransformer, output diodes, reactor, shunt, feedback and thermal switch. CT-312 Top Inverter BoardSwitching devices, driver transformer, control module and top-board supply.

ZX7 / WS stick-TIG inverter family

ZX7 / WS stick-TIG inverter board familyBase board, upper board, long-strip control board, driver board and HF/TIG route.

WS-200P / WS-200S TIG board-stack family

WS-200P / WS-200S TIG welder board stackBottom board, upper board, middle board and HF start section organized by repair path.

Model-family repair entry points

Start from a machine family when the exact board or fault name is unknown.

ZX7 / WS inverter board familyProtection, feedback, drive-enable and long-strip control-board route. WS-200P / WS-200S TIG board stackBottom board, upper board, middle board, gas, HF and arc-start sequence. WSM-315 TIG control pathGas, HF, main current, panel, pedal and feedback route. WSE AC/DC TIG secondary inverterDC works but AC fails, one-sided AC waveform and balance diagnosis. NBC / CO2-MIG wire-feed pathNo wire feed, continuous feed and wire-feeder PWM evidence. TIG HF arc-start pathGas but no HF, weak HF, relay click with no spark and HF cutoff issues.