Lincoln Electric SVM100-A service manual Control Board G2150 cont’d

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G-4	ELECTRICAL DIAGRAMS
CONTROL BOARD (G2150) (cont’d)
Item	Identification
X19	IC-UNDERVOLTAGE-SENSING,RESET,
	MCU
X10	IC-CMOS,INVERTER,SCHMITT,
	HEX,HC14A
C65,C66	CAPACITOR-TAEL,4.7,35V,10%
X11,X14	IC-OP-AMP,QUAD,HIGH-PERF,33074A
C49,C67,C68	CAPACITOR-CD,.0047,3000V,20%
DZ13,DZ14,DZ15,	ZENER DIODE-1W,12V,5%,1N4742A
DZ16,DZ17
J2	CONNECTOR,PCB,WW,MALE,DIL,1X9
X15	REGULATOR & HEATSINK ASBLY
D10,D11,D21,D22	DIODE-AXLDS,1A,1000V
C79,C80	CAPACITOR-CD,750P,1000V,10%
R33	RESISTOR-MF,1/4W,301,1%
Y1	CRYSTAL-QUARTZ,8.000MHZ
OCI8,OCI9,OCI10	OPTOCOUPLER-TRIAC DRIVER,ZVC,
	3083
X20,X21,X22	IC-CMOS,LATCH,3-STATE,OCTAL,
	HC573A
TRI1,TRI2,TRI3	TRIAC-T220,6A,800V
R237	TRIMMER-MT,1/2W,10K,10%,LINEAR
X31,X32	IC-ARRAY,CLAMPING,PERIPHERAL
R164,R235	RESISTOR-WW,5W,150,5%,SQ
R7	RESISTOR-MF,1/4W,133K,1%
R230,R231,R232,	RESISTOR-MF,1/4W,26.7K,1%
R233,R234

NOTE: Lincoln Electric assumes no responsibility for liabilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not avail- able from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.

SQUARE WAVE TIG 255

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Contents Square Wave TIG ARC Rays can burn SafetyElectric Shock can kill Fumes and Gases can be dangerousCylinder may explode if damaged Welding Sparks can cause fire or explosionElectric and Magnetic Fields May be dangerousPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation SectionInstallation Technical Specifications Square Wave TIGSelect Suitable Location Safety PrecautionsHigh Frequency Interference Protection StackingInput Connections Ground ConnectionInput Supply Connections Reconnect Procedure Output ConnectionsTIG Torch Connection Table A.1 Stick Electrode Cable ConnectionOperation Section General Warnings OperationOperating Instructions Fumes and GasesSection TOC Work Connec Polarity Do not Switch AC & DC Recti Fier Power SourceWhile Weld ING TIG Gtaw Single Phase Coolant Tion OutputGeneral Description Design Features AdvantagesOperational Features and Controls Recommended Processes and EquipmentWelding Capability LimitationsControls and Settings Control Panel KeysCase Front Controls LoadHand and Foot Amptrol Welding Operation Accessory Operation TIG WeldingTable B.1 Recommended Polarity Settings for TIG Welding TIG Welding GuidelinesTIG Welding Sequence Operation 2-STEP Mode Table B.2 Typical Current Ranges 1 for Tungsten ElectrodesSquare Wave TIG 255 12/95 TIG Welding Sequence Operation 4-STEP Mode ALL Machines Auxiliary PowerAdvanced TIG Welding Features AC Wave Balance and Auto BalanceOverload Protection Square Wave TIG Accessories Section Installation of Field Installed Options AccessoriesOptions / Accessories Undercarriage FunctionMaintenance Section Routine and Periodic Maintenance MaintenanceMaintenance Safety PrecautionsFigure D.1 General Assembly Exploded View Square Wave TIG Power Supply Block Logic Diagram Theory of Operation SectionTheory of Operation Input Line Voltage and Main TransformerOutput Rectification and Feedback Control High Voltage / High Frequency Circuit DC Welding Output DC Welding CircuitAC Welding Output AC Welding CircuitSCR Operation SCR Operation Square Wave TIGThermal Protection Troubleshooting & Repair Section 1TROUBLESHOOTING & Repair HOW to USE Troubleshooting GuideTroubleshooting & Repair PC Board Troubleshooting ProceduresTroubleshooting Guide Output Problems12/95 Square Wave TIG Troubleshooting & Repair Problems Symptoms Possible Areas of MisadjustmentsRecommended Course of Action Function Problems Troubleshooting Guide Troubleshooting & Repair TIG Mode Problems Troubleshooting & Repair Troubleshooting Guide TIG Welding Problems Troubleshooting & Repair Stick Welding Problems PC Board Connector Locations Figure F.1 Control Board ConnectorsControl Transformer T2 Voltage Test Test DescriptionMaterials Needed Test Procedure Control BOXControl Transformer T2 Voltage Test Figure F.4 Control Board and TransformerPROTECTION/SNUBBER Board Continuity Test PROTECTION/SNUBBER Board Continuity Test Figure F.6 PROTECTION/SNUBBER Board Test Points Table F.6 Square Wave TIGARC Start Trigger Circuit Test ARC Start Trigger Circuit Test Figure F.9 PROTECTION/SNUBBER Board Test Points Static SCR Test Static SCR Test Figure F.11 Protection Board Plug LocationsActive SCR Test Active SCR Test Figure F.13 PROTECTION/SNUBBER Board Plug LocationsBattery Test Silicon Controlled Rectifier TestNormal Open Circuit Voltage Waveform DC Stick Mode Scope SettingsNormal Open Circuit Voltage Waveform AC Stick Mode Normal Open Circuit Voltage Waveform DC TIG Mode Normal Open Circuit Voltage Waveform AC TIG Mode Typical Output Voltage Waveform Machine Loaded DC TIG Mode Machine Loaded to 200 Amps AT 50 VDCAC TIG Mode Auto Balance on Machine Loaded to 50 Amps AT 26VACMachine Loaded to 200 Amps AT 46 VAC Volts 5ms Typical SCR Gate Voltage WaveformVolts 2ms Troubleshooting & Repair FAN Motor and Blade Removal Tools RequiredFAN Motor and Blade Removal SCR Heat Sink Assembly Removal Materials RequiredSCR Heat Sink Assembly Removal Retest After Repair Input Idle AmpsRecommended Meters for Machine Output Tests Retest After Repair cont’d Figure F.16 Transformer Lead Test PointsElectrical Diagrams Electrical Diagrams Control Board G2150 PTC1,PTC2 THERMISTOR-PTC,56 OHMS,90MAControl Board G2150 cont’d Square Wave TIG PROTECTION/SNUBBER Board L9255 CAPACITOR-CEMO,4700P,50V,10% Square Wave TIG Wiring Diagram Square Wave TIG Machine Schematic Square Wave TIG 6 a 0 a 7 a 8 a 3 CG2150 A C C TControl Board Schematic Square Wave TIG 255 cont’d G2150 Y P a DPROTECTION/SNUBBER Board Schematic Square Wave TIG 255 L9255 Keypad LED Board Square Wave TIG 255 L9212