Board, connector and measurement references

Welder Boards

Use Boards when the machine is already open and the technician is looking at a board, connector, socket or measurement point. Board pages should explain what that board controls, which faults point to it, what evidence to collect, and which Diagnostics, Circuits, Components or Tools to open next.

Start here by board evidence

Choose the physical evidence you have. If you only know the symptom, start from Faults. If you know the model but not the board, start from Models.

Control

Control boards and panel-command boards

For torch input, gas/HF command, current command, protection input and display/control logic.

HF start

High-frequency arc-start boards

For TIG/plasma no-HF, HF stuck on, HV pack, relay, discharge and arc-start output paths.

Power

Power, inverter and secondary-output boards

For breaker trip, no output, MOSFET/IGBT failure, output diode, secondary inverter and current-control issues.

Connectors

Connector and measurement-point references

For named points such as X13, X14, X16, X17, P12, P14, P17, CON5 and CON6.

How this section relates to Diagnostics

Boards explain board-level evidence. Diagnostics explain what to do step by step for a fault. A board page should not be a standalone description only: it should point to the related fault routes and help the user avoid blind board replacement.

Control boards and panel-command boards

Use these when the evidence involves torch input, display power, gas command, HF command, current command, protection input or panel settings.

LGK60L Main Control BoardX16 DC24V, X17 AC rails, protection inputs, fan/gas/HF and control evidence. LGK100L Control Board Connector ReferenceX13 display DC5V, X7 rails, X14 Hall feedback and protection routes. MIG200DL Power / Control BoardP12 DC540V, P6 DC5V, P13 trigger, P14 feeder, P17 gas and P1/P2 drive. WSM-315 Control Panel2T/4T, pre-flow, post-flow, start, upslope, crater and current settings. WSM-315 Control BoardTorch switch, panel command, gas solenoid, HF command and current command evidence. WSE AC/DC TIG Control PanelAC/DC selector, pulse, balance, gas/HF timing and secondary driver command.

HF arc-start boards and start-support paths

Use these when gas works but HF is missing, HF remains on, or TIG/plasma cannot transfer from HF start to main arc.

LGK60L HF Arc-Start BoardHF output, gas/start support and plasma cutter arc-start evidence. WSM-315 HF Arc-Start BoardHF relay, HV pack, discharge path and TIG arc-start output. TIG HF Arc-Start SequenceTorch input, gas pre-flow, HF command, arc transfer and HF cutoff. TIG Gas Flows But HF MissingHF command, relay, HV pack and arc-start output route. TIG HF Stuck OnArc transfer, HF command cutoff, relay/contact and feedback path. CT-312 Gas Clicks No HF No ArcBottom-board support, HF command and main output transfer split.

Power, inverter and secondary-output boards

Use these when the fault involves breaker trip, power-device short, no output, weak current, output diode failure or AC/DC TIG secondary switching.

ZX7-160/200 Board StackBottom input/DC bus, top inverter/driver and middle transformer/output layer. CT-312 Bottom BoardAuxiliary supply, relay/start path, gas/fan/HF sockets and process support. CT-312 Middle BoardMain transformer, output diodes, reactor, shunt, feedback and thermal switch. CT-312 Top Inverter BoardPower devices, driver transformer, control module and top-board supply. WSE Secondary Inverter BoardAC/DC TIG polarity switching, secondary driver and balance/pulse behavior. WSE Secondary Inverter Driver BoardSecondary driver-stage reference for AC/DC TIG switching faults.

Connector and measurement-point references

Use these when the evidence is a named connector, voltage rail, board-stack layer or signal path.

Connector and Measurement Point IndexLGK60L X16/X17, LGK100L X13/X7/X14, MIG200DL P12/P6/P13/P14/P17/CON5/CON6. LGK Control Power RailsControl power rails and low-voltage evidence for LGK plasma cutter faults. MIG200DL Wire-Feed / Gas-Valve ControlP13, P14, P17 signal and output split. Small Inverter Board-Stack MapGeneric bottom/top/middle board-layer logic for compact inverter welders. TIG Gas Solenoid Control PathTorch input, timing logic, output driver, solenoid coil and post-flow control. Power Device Failure IndexIGBT, MOSFET, rectifier bridge, output diode and repeated failure routes.

NBC CO2/MIG wire-feed board references

NBC wire feeder board reference24V rail, torch input, gas valve, motor output, burn-back and 2T/4T checks.

ZX7 / WS inverter control boards

ZX7 / WS long-strip control board referenceFeedback, current control, thrust, protection lamp, thermal switch, 24V and drive connector route.

WS TIG upper, lower and middle board references

WS-200P / WS-200S board referenceGas relay, HF control, DC bus, feedback, protection, MOSFET drive and secondary rectifier roles.

WS / TIG HF arc-start boards

WS-250 HF arc-start board referenceHF relay, boost transformer, discharge resistor, HV silicon stack, gas valve and hand-switch path.

Board pages grouped by repair route

Use these board entries together with the matching diagnostic and circuit path pages.

NBC wire feeder boardMotor output, PWM, burn-back, 24V and gas/trigger evidence. ZX7 / WS long-strip control boardCurrent command, feedback, protection and drive-enable routing. WS-200P / WS-200S board referenceUpper, lower and middle board roles in TIG start sequence. WS-250 HF arc-start boardHF relay, boost transformer, discharge path and weak-HF diagnosis. WSM-315 control boardTorch, gas, HF, panel, pedal, feedback and protection logic. WSE secondary inverter boardAC polarity switching, balance behavior and no-AC-output checks. WS-180P upper board reference Dedicated WS-180P board page for upper-board images, connector orientation, HF socket, feedback controls and future board-layout evidence. \n WS-180P upper board reference Dedicated WS-180P board page for upper-board images, connector orientation, HF socket, feedback controls and future board-layout evidence. \n NBC-200 control board reference Control-board orientation for voltage feedback, DC24V, thermal-switch socket, wire-feeder interface, DC540V and drive socket.