Page 1 NOTE: This manual will cover most of the troubleshooting and repair procedures for the code numbers listed. Some variances may exist when troubleshooting/repairing later code numbers. ™ ASPECT For use with machines having Code Numbers: 12165 SERVICE MANUAL SVM256 | Issue D ate 15-Jul ©...
Page 2 Service and repair should be performed by only exhaust at the arc, or both, to keep Lincoln Electric Factory Trained Personnel. Unauthorized the fumes and gases from your breathing zone and the general area. repairs performed on this equipment may result in danger...
Page 3: Section A: Warnings
American Welding Society, P.O. Box 351040, Miami, Florida 33135 MAGNETIC FIELDS MAY or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the Lincoln Electric Company, 22801 BE DANGEROUS St. Clair Avenue, Cleveland, Ohio 44117-1199.
Page 4: Electric Shock Can Kill
ASPECT ™ 375 SAFETY ELECTRIC SHOCK ARC RAYS CAN BURN. CAN KILL. 3.a. The electrode and work (or ground) circuits are 4.a. Use a shield with the proper filter and cover electrically “hot” when the welder is on. Do plates to protect your eyes from sparks and the rays of the arc not touch these “hot”...
Page 5 ASPECT ™ 375 SAFETY WELDING AND CUTTING CYLINDER MAY EXPLODE IF SPARKS CAN CAUSE DAMAGED. FIRE OR EXPLOSION. 7.a. Use only compressed gas cylinders containing the correct shielding gas for the process used 6.a. Remove fire hazards from the welding area. and properly operating regulators designed for If this is not possible, cover them to prevent the gas and pressure used.
Page 6: Electromagnetic Compatability (Emc)
Electromagnetic Compatibility (EMC) Product Standard for Arc Welding equipment, in metallic conduit or equivalent. Shielding should be Equipment. It is for use with other Lincoln Electric equipment. It is electrically continuous throughout its length. The shielding should be designed for industrial and professional use.
Page 7 ASPECT ™ 375 SAFETY Ventilation As a rule of thumb, for many mild steel electrode, if the air is visibly clear and you are comfortable, then the ventilation is generally There are many methods which can be selected by the user to adequate for your work.
Page 8 TLV and PEL values are as of April 2006. Always check Material Know Act of 1986 and of 40CFR 370 and 372. Safety Data Sheet (MSDS) with product or on the Lincoln Electric website at http://www.lincolnelectric.com (b) The PEL for chromium (VI) is .005 milligrams per cubic meter as an 8 hour time weighted average.
Page 9 ASPECT ™ 375 NOTES viii...
Page 10 ASPECT ™ 375 TABLE OF CONTENTS MASTER TABLE OF CONTENTS FOR ALL SECTIONS Page Safety ....................................ii-viii Installation, Operation, Accessories, Maintenance ................See Instruction Manual Theory of Operation ..............................Section E Troubleshooting and Repair ............................Section F Electrical Diagrams ..............................Section G...
Page 11: Table Of Contents
Aspect 375 Specific Data, Machine Start Up ........
Page 12: Theory Of Operation
GAS SOLENOID INPUT POWER BOARD The AC input (3 phase or single phase) is applied to the Aspect 375 thru an on/off switch. The AC input power is applied to a 3 phase input rectifier bridge. The DC output of the input rectifier bridge is then applied to the Buck/Boost board.
Page 13: Input Control Board
LED indicates if the DC capacitors are over or under voltaged. The fourth LED indicates if three phase or single phase voltage is being applied to the machine. The Aspect 375 automatically limits the output to 275 amps when in single phase operation.
Page 14: Buck/Boost Board
ASPECT ™ 375 THEORY OF OPERATION Figure E.4 - Buck/boost board 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE THERMO CHOKE BUCK...
Page 15: Inverter Board
ASPECT ™ 375 THEORY OF OPERATION Figure E.5 - Inverter board 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE THERMO CHOKE BUCK...
Page 16: 115V Auxiliary Board
ASPECT ™ 375 THEORY OF OPERATION Figure E.6 - 115V auxiliary board 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE THERMO CHOKE...
Page 17: User Interface Board & Control Board
ASPECT ™ 375 THEORY OF OPERATION Figure E.7 - User interface board & control board 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT...
Page 18: Output Board
ASPECT ™ 375 THEORY OF OPERATION Figure E.8 - Output board 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE THERMO CHOKE BUCK...
Page 19: High Frequency Board & Bypassing
ASPECT ™ 375 THEORY OF OPERATION Figure E.9 - High frequency board & bypassing 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE...
Page 20: Main Transformer
ASPECT ™ 375 THEORY OF OPERATION Figure E.10 - Main transformer 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE THERMO CHOKE BUCK...
Page 21: Output Diode Modules
ASPECT ™ 375 THEORY OF OPERATION Figure E.11 - Output diode modules 115V DUPLEX DOUBLER RECEPTICAL DC BUSS INDUCTORS CAPACITOR INVERTER THERMO THERMO INVERTER 115V CHOKE INPUT SWITCH MAIN DOUBLER TRANS OUTPUT INVERTER WINDING DIODE BOARD BOOST BOOST MODULES INPUT MODULE THERMO CHOKE...
Page 22: Machine Start Up
BOARD SIGNALS +15V, -15V +15V ASPECT 375 SPECIFIC DATA MACHINE START UP • Inverter runs at 35 KHz. There are four main actions when machine is turned on: • Machine starts with DC(+) in AC polarity for both Tig & Stick, 1.
Page 23: Ocv Values
ASPECT ™ 375 THEORY OF OPERATION Figure E.13 - OCV operation STICK OR TRIGGER 400V CLOSED VOLT FEEDBACK* CONTROL BOARD OUTPUT BOARD INVERTER BOARD OUTPUT TURNS ON CONNECTS SWITCHES RECTIFIER INVERTER BOARD RECTIFIER MAIN XFMR RECTIFIES & COMMANDS OUTPUT TO ON/OFF AT 35KHZ XFMR OUTPUT OUTPUT BOARD...
Page 24 ASPECT ™ 375 THEORY OF OPERATION Figure E.14 - Load Operation STICK OR TRIGGER 400V CLOSED VOLT & AMP FEEDBACK* ISET* CONTROL BOARD OUTPUT BOARD INVERTER BOARD OUTPUT TURNS ON CONNECTS SWITCHES RECTIFIER INVERTER BOARD RECTIFIER MAIN XFMR RECTIFIES & COMMANDS OUTPUT TO ON/OFF AT 35KHZ XFMR OUTPUT...
Page 25 ASPECT ™ 375 THEORY OF OPERATION Figure E.15 - Super position circuit SUPER POSITION CIRCUIT INFORMATION USE ONLY. NO MEASUREMENTS REQUIRED. 30A OUTPUT CURRENT WAVEFORM SUPER POSITION CIRCUIT ACTIVE SNUBBER CIRCUIT FUNCTION FUNCTION Hi-freq is only for starting in AC, what is needed is the Super Position To snub transient voltage to protect power components on Output Circuit to re-light the arc at zero-crossings.
Page 26: Doubler Circuit
ASPECT ™ 375 THEORY OF OPERATION Figure E.16 - Doubler circuit components DOUBLER CIRCUIT-COMPONENTS DOUBLER DOUBLER WINDING 1 INDUCTOR 1 DOUBLER RECTIFIER DOUBLER DOUBLER WINDING 2 INDUCTOR 2 ADD 35V TO OCV LIMIT CURRENT RECTIFY TO DC THIS IS A BASIC DESCRIPTION OF WHAT IS ACTUALLY IN THE WELDER. DOUBLER CIRCUIT FUNCTION To boost voltage up to maintain the arc in Stick (whipping) and in AC...
Page 27 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR TABLE OF CONTENTS - TROUBLESHOOTING AND REPAIR SECTION - Troubleshooting and Repair ....................Section F How to Use Troubleshooting Guide ..........F-3 PC Board Troubleshooting Procedures .
Page 28: Troubleshooting And Repair
ASPECT ™ 375 TROUBLESHOOTING AND REPAIR TABLE OF CONTENTS - TROUBLESHOOTING AND REPAIR SECTION - Troubleshooting and Repair ....................Section F 400 VDC Bus Capacitor Removal And Replacement Procedure ..... .F-103 Output Diode Module Removal And Replacement Procedure .
Page 29: How To Use Troubleshooting Guide
HOW TO USE TROUBLESHOOTING GUIDE WARNING Service and repair should be performed by only Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please observe all safety notes and precautions detailed throughout this manual.
Page 30: Pc Board Troubleshooting Procedures
ASPECT ™ 375 TROUBLESHOOTING AND REPAIR PC BOARD TROUBLESHOOTING PROCEDURES 4. Test the machine to determine if the failure symptom has been WARNING corrected by the replacement PC board. NOTE: It is desirable to have a spare (known good) PC board available for PC board troubleshooting.
Page 31: Troubleshooting Guide
CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
Page 32 4. Perform the Output Board Test. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
Page 33 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
Page 34 3. Set for 2-step trigger. 4. Reduce start current. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
Page 35 3. Contaminated tungsten. 4. Faulty torch. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
Page 36 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. F-10...
Page 37 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. F-11...
Page 38 2. AC frequency may not suit application. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. F-12...
Page 39 Module Test. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. F-13...
Page 40 J05 connector on the output board disconnected. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. F-14...
Page 41 EQUIPMENT INTO A SEPARATE 115V SUPPLY. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. F-15...
Page 42 ASPECT ™ 375 NOTES F-16...
Page 43: Case Cover Removal And Replacement Procedure
CASE COVER REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty.
Page 44 (2 PER HANDLE) REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Using a 5/16” nutdriver, remove the eight screws and washers (two on top, two on each side and two on the rear) securing the rear handle to the machine.
Page 45 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CASE COVER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.2 – Side handle mounting screw and corner cap mounting screw locations SIDE HANDLE MOUNTING SCREWS (2 PER SIDE, 4 PER HANDLE) CORNER CAP MOUNTING SCREWS (4 CAPS TOTAL) Figure F.3 –...
Page 46 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CASE COVER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.4 – Case wraparound mounting screw locations CASE WRAPAROUND MOUNTING SCREWS REPLACEMENT PROCEDURE 1. Carefully position the case wraparound onto the machine. 2. Using a 5/16” nutdriver, attach the three screws securing the case wraparound to the machine.
Page 47: Capacitor Discharge Procedure
CAPACITOR DISCHARGE PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 48 7. Obtain a high resistance (25-1000 ohms) and 25 watts minimum PROCEDURE resistor (LECO part: S10404-57). This resistor is not supplied 1. Remove the input power to the Aspect 375 machine. with the machine. NEVER USE A SHORTING STRAP FOR THIS PROCEDURE.
Page 49 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CAPACITOR DISCHARGE PROCEDURE (continued) Figure F.6 – Input rectifier discharge and location INPUT RECTIFIER POWER RESISTOR INSULATED PLIERS GLOVES 12. Using electrically isolated gloves and insulated pliers, hold the body of the resistor and connect the resistor to terminals 601 and 602 at the input rectifier.
Page 50 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CAPACITOR DISCHARGE PROCEDURE (continued) Figure F.7 – Output board section POWER RESISTOR INSULATED PLIERS GLOVES F-24...
Page 51: Pre-Test Procedure
PRE-TEST PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 52 12. The small fan on the top shelf (toward the rear) should be in PROCEDURE motion. 1. Remove the input power to the Aspect 375 machine. 13. With 230 VAC (single phase), check for 110 VDC at terminals 4 2. Perform the Case Cover Removal Procedure.
Page 53: Output Diode Module Test
OUTPUT DIODE MODULE TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 54 Figure F.9 – Output diode modules location (left side of machine) OUTPUT DIODE MODULES (8) PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Locate the output diode modules. See Figure F.9.
Page 55 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT DIODE MODULE TEST (continued) Figure F.10 – Output diode module test points + – + – OUTPUT DIODE MODULES + – UNDER TEST (8 TOTAL) (2 DIODES PER MODULE 16 MEASUREMENTS TOTAL) + – + –...
Page 56 ASPECT ™ 375 NOTES F-30...
Page 57: Discharge Resistor Module Test
DISCHARGE RESISTOR MODULE TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 58 DISCHARGE RESISTOR MODULES PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Locate the discharge resistor modules. See Figure F.11. 5. Using a digital volt/ohmmeter (set for ohms), measure the total resistance from lead 232 to lead 231.
Page 59 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR DISCHARGE RESISTOR MODULE TEST (continued) Figure F.12 – Discharge resistor module test points LEAD 232 TERMINAL 100 OHMS OF TOTAL RESISTANCE AT LEADS 232 TO 231 LEAD 231 TERMINAL F-33...
Page 60 ASPECT ™ 375 NOTES F-34...
Page 61: Voltage Doubler Rectifier Module Test
VOLTAGE DOUBLER RECTIFIER MODULE TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 62 Figure F.13 – Voltage doubler rectifier module location VOLTAGE DOUBLER RECTIFIER MODULE PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Locate the voltage doubler rectifier module. See Figure F.13.
Page 63 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR VOLTAGE DOUBLER RECTIFIER MODULE TEST (continued) Figure F.14 – Voltage doubler rectifier module test points LEAD 213 – LEAD 214 MODULE SCHEMATIC Table F.2 – In circuit (connected) tests POSITIVE TEST PROBE NEGATIVE TEST PROBE EXPECTED RESULT TERMINAL 4 TERMINAL 1...
Page 64 ASPECT ™ 375 NOTES F-38...
Page 65: Input Rectifier Test
INPUT RECTIFIER TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 66 8. If the input rectifier is good on the forward voltage drop section PROCEDURE test, connect any previously disconnected leads. See Wiring 1. Remove the input power to the Aspect 375 machine. Diagram. 2. Perform the Case Cover Removal Procedure.
Page 67 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT RECTIFIER TEST (continued) Figure F.16 – Input rectifier test points AA BB CC – INPUT RECTIFIER SCHEMATIC Table F.4 – Input rectifier test points (forward voltage drop section) POSITIVE TEST PROBE NEGATIVE TEST PROBE EXPECTED RESULT TERMINAL AA TERMINAL 602 (+)
Page 68 ASPECT ™ 375 NOTES F-42...
Page 69: Gas Solenoid Test
GAS SOLENOID TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 70 11. If the voltages are not present, disconnect the wiring to the PROCEDURE terminals of the solenoid. See Figure F.20. See Wiring Diagram. 1. Remove the input power to the Aspect 375 machine. 12. Using a volt/ohmmeter, measure the resistance of the gas 2. Perform the Case Cover Removal Procedure.
Page 71 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR GAS SOLENOID TEST (continued) Figure F.18 – 3 harness jumper connection points JIP4 JIP3 JIP8 Table F.6 – Gas solenoid tests SOLENOID RESISTANCE TEST 63 TO 88 OHMS SOLENOID VOLTS ENERGIZED TEST 22 TO 25 VDC F-45...
Page 72 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR GAS SOLENOID TEST (continued) Figure F.19 – 6 Pin remote amphenol location and pins 6 PIN REMOTE AMPHENOL Figure F.20 – Gas solenoid lead locations GAS SOLENOID F-46...
Page 73: Output Board Test
OUTPUT BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 74 Module Test, Voltage Doubler Rectifier Module Test and Replacement Procedure. High Frequency & Output Bypass Circuit Board Test (output 18. Perform the Case Cover Replacement Procedure. snubber section only). 8. Carefully apply the correct input power to the Aspect 375 machine. 9. Turn the machine ON. F-48...
Page 75 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT BOARD TEST (continued) Figure F.22 – Output board LED locations R256 C116 DZ13 DZ14 R265 DZ15 FTP9 FTP8 LED 5 FTP4 R255 FTP7 FTP2 LED 2 C135 R251 R252 R254 R187 R120 R119 C106 R253 OCI6...
Page 76 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT BOARD TEST (continued) Figure F.23 – Output board plug locations R256 C116 DZ13 DZ14 R265 DZ15 FTP9 FTP8 FTP4 R255 FTP7 FTP2 C135 R251 R252 R254 R187 R120 R119 C106 R253 OCI6 DZ16 DZ17 FTP3 R268...
Page 77 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT BOARD TEST (continued) Figure F.24 – Output board pin and lead locations BACKGROUND CHOKE BACKGROUND CHOKE Table F.10 – AC module forward voltage drop tests MODULE PIN TYPE OF READING FORWARD VOLTAGE DROP +/- 20% ERROR RANGE TEST POINTS PIN 8(+) TO PIN 4(-)
Page 78 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT BOARD TEST (continued) Figure F.25 – AC module test point locations DC NEGATIVE DC POSITIVE INPUT (4) INPUT (3) NTC THERMAL DEVICE (5) C116 R265 NEGATIVE GATE (1) POSITIVE GATE (7) R187 R256 C116 DZ13 DZ14...
Page 79: Current Transducer Test (On The Output Board
CURRENT TRANSDUCER TEST (ON THE OUTPUT BOARD) WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty.
Page 80 13. If the voltage is not present, the +15 and -15 volt supplies will have to be checked at the same output board connector. 1. Remove the input power to the Aspect 375 machine. 14. Using a digital volt/ohmmeter, check for +15 VDC on plug J02 at 2.
Page 81 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CURRENT TRANSDUCER TEST (ON THE OUTPUT BOARD) (continued) Figure F.27 – Plug J02 pin and lead locations F-55...
Page 82 ASPECT ™ 375 NOTES F-56...
Page 83: Buck/Boost Board & Igbt Test
BUCK/BOOST BOARD & IGBT TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 84 If the LED pattern is correct and there is not 400 VDC generated on the C1 capacitor, then the buck/boost board is faulty. 10. Carefully apply the input power to the Aspect 375 machine. 11. A relay on this board should emit an audible click. See Figure F.29.
Page 85 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR BUCK/BOOST BOARD & IGBT TEST (continued) Figure F.29 – Forward voltage drop test points SECTION A BOOST C4AT IND2 SECTION B DCIN+ RELAY DCIN SECTION C IND1 W70X1076rev02 L16392-1 SECTION D Table F.12 – Forward voltage drop tests SECTION TO BE TEST POINTS EXPECTED READING...
Page 86 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR BUCK/BOOST BOARD & IGBT TEST (continued) Figure F.30 – DC voltage test points DC+ OUTPUT BOOST DC- OUTPUT C4AT IND2 IND2 DCIN+ DC+ INPUT DC- INPUT DCIN IND1 IND1 W70X1076rev02 L16392-1 Table F.13 – Typical rectified 3 phase input AC INPUT 208 VAC 294 VDC...
Page 87: Buck & Boost Ptc Thermistors Test
BUCK & BOOST PTC THERMISTORS TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty.
Page 88 10. Using a digital volt/ohmmeter, measure the resistance on the lead PROCEDURE side of the plug J4. See Table F.15, for test points and expected 1. Remove the input power to the Aspect 375 machine. readings. 2. Perform the Case Cover Removal Procedure.
Page 89 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR BUCK & BOOST PTC THERMISTORS TEST (continued) Figure F.32 – Plug J3 and J4 locations BOOST C4AT PLUG J3 IND2 BOOST PTC DCIN+ PLUG J4 BUCK PTC DCIN IND1 W70X1076rev02 L16392-1 Table F.15 – Resistance tests TEMPERATURE RESISTANCE (CAN BE +/- 10% OF STATED VALUES) 77ºF TO 140ºF...
Page 90 ASPECT ™ 375 NOTES F-64...
Page 91: Inverter Board Test
INVERTER BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 92 BOARD PROCEDURE SNUBBER RESISTOR MODULE TEST SECTION 1. Remove the input power to the Aspect 375 machine. 11. Using a digital volt/ohmmeter (set to resistance mode), measure the resistance of the inverter board snubber resistor module. See 2. Perform the Case Cover Removal Procedure.
Page 93 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INVERTER BOARD TEST (continued) Figure F.34 – module and snubber resistor test points = MOLEX PIN 1 SECTION A SECTION C POSITIVE NEGATIVE NEGATIVE POSITIVE SECTION B SECTION D NEGATIVE POSITIVE POSITIVE NEGATIVE SNUBBER RESISTOR (100 OHMS +/- 20%) 22.
Page 94 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INVERTER BOARD TEST (continued) Table F.16 – Forward voltage drop tests SECTION TO BE METER PROBES EXPECTED READING +/- 20% VALUES MEASURED SEE FIGURE F.34 SECTION A .32 VOLTS DC +/- 20% .256 TO .384 SECTION B .32 VOLTS DC +/- 20% .256 TO .384...
Page 95: Input Control Board Test
INPUT CONTROL BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 96 12. See Table F.18 for the other LED functions by testing for single PROCEDURE or three phase input power (pulling one of the input fuses can 1. Remove the input power to the Aspect 375 machine. accomplish this before starting the welder). See Wiring Diagram. 2. Perform the Case Cover Removal Procedure.
Page 97 24. Connect a known good water cooled Tig torch to a known good Cool Arc 47 cooler. 25. Connect the cooler to the Aspect 375 machine. See the Wiring Diagram. 26. If the voltage readings are correct and the cooler is NOT running.
Page 98 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT CONTROL BOARD TEST (continued) Figure F.38 – Input control board plug and LED locations LED 1 LED 2 LED 5 LED 4 LED 3 Figure F.39 – Input control board main fan control plug and pin locations (UPPER FAN) (LOWER FAN) F-72...
Page 99 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT CONTROL BOARD TEST (continued) Table F.18 – Input control board LEDs LED# COLOR FUNCTION GREEN CPLD HAS SOFTWARE AND IS WORKING GREEN ON FOR 3 PHASE INPUT, OFF FOR SINGLE PHASE. GREEN ON = CORRECT INPUT VOLTAGE. OFF = UNDERVOLTAGE. BLINKING = OVERVOLTAGE GREEN BOOST DRIVE FUNCTIONING GREEN...
Page 100 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT CONTROL BOARD TEST (continued) Figure F.40 – Cooler control section plug and pin locations F-74...
Page 101: Input Power Board Test
INPUT POWER BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 102 13. Using a digital volt/ohmmeter, test for the correct 3 phase input PROCEDURE power at the JIP3 connector. See Table F.22. 1. Remove the input power to the Aspect 375 machine. NOTE: This measurement should be checked for all 3 phases at 2. Perform the Case Cover Removal Procedure.
Page 103 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT POWER BOARD TEST (continued) Figure F.42 – Input power board harness connection points JIP4 JIP3 JIP8 25. If everything is normal you should hear the relay click and the 75 VDC SUPPLY TEST (FOR OUTPUT BOARD) resistor should not overheat with a load on the output of the 16.
Page 104 224 (PIN 2) TO 225 (PIN 1) 75 VDC Table F.24 – Low level power supplies tests JIP2 connector LOW LEVEL POWER SUPPLIES PRODUCED FROM THE INPUT POWER BOARD FOR OTHER BOARDS IN THE ASPECT 375 TEST POINT TEST POINT...
Page 105 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT POWER BOARD TEST (continued) Figure F.43 – Input power board LED locations LED 1 LED 2 LED 3 LED 4 Figure F.44 – Input power board plug locations JIP4 JIP3 JIP2 JIP1 F-79...
Page 106 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT POWER BOARD TEST (continued) Figure F.45 – Input power board lead and pin locations JIP4 JIP3 JIP1 JIP2 Figure F.46 – Precharge resistor and relay locations PRECHARGE RELAY RESISTOR F-80...
Page 107: High Frequency & Output Bypass Circuit Board Test
HIGH FREQUENCY & OUTPUT BYPASS CIRCUIT BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty.
Page 108 12. Connect a known good TIG torch and connect a regulated ARGON 1. Remove the input power to the Aspect 375 machine. gas typically (20 CFH) to the rear solenoid and turn on the gas. 2. Perform the Case Cover Removal Procedure.
Page 109 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR HIGH FREQUENCY & OUTPUT BYPASS CIRCUIT BOARD TEST (continued) Figure F.48 – Gas output stud and remote control connector locations TWIST-MATE ELECTRODE / 6 PIN REMOTE GAS OUTPUT STUD CONTROL CONNECTOR 16. If the LEDs are illuminated and the high frequency is not present at the torch (if one is attached), make sure that the 1000 VDC leads are attached to the high frequency board terminals B1 to B2.
Page 110 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR HIGH FREQUENCY & OUTPUT BYPASS CIRCUIT BOARD TEST (continued) Figure F.49 – 6 pin remote control connector pins Figure F.50 – High frequency board LED locations OCI1 LED 1 LED1 LED 2 LED2 F-84...
Page 111: User Interface Board Test
USER INTERFACE BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 112 20 feet. NOTE: The green power ON light flashes during the power up process. 15. Using stick DC mode will cause the Aspect 375 to go into fold Flashing indicates the 400 VDC bus is building up. When the back (low current hold mode) this protects its electronics.
Page 113 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR USER INTERFACE BOARD TEST (continued) Figure F.52 – User interface SEE FIGURE F.53 (FOR CLOSE UP DETAIL) MEMORY DISPLAY VOLTAGE DISPLAY AMPERAGE: 1 TO 9 DURING WELDING SET/ACTUAL AC/DC POLARITY SELECT A MEMORY SELECT RF TIG / LIFT TIG STICK: SOFT/CRISP QUICK SELECT FOR...
Page 114 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR USER INTERFACE BOARD TEST (continued) Table F.26 – Resettable features FOUND IN MENU B FOUND IN MENU C ARC FORCE STARTING POLARITY HOT START STARTING CURRENT STICK POLARITY STARTING TIME SPOT TIMER STARTING SLOPE PRESET CURRENT MINIMUM F-88...
Page 115: Control Board Test
CONTROL BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 116 13. Using a digital volt/ohmmeter, perform the voltage tests on plug PROCEDURE JC1 on the control board. See Figure F.55 and F.57. See Table 1. Remove the input power to the Aspect 375 machine. F.30. See Wiring Diagram. 2. Perform the Case Cover Removal Procedure.
Page 117 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CONTROL BOARD TEST (continued) Figure F.55 – Control board LED and plug locations LED 1 LED 2 LED 3 SWITCHES Table F.27 – Control board LEDs LED# COLOR FUNCTION GREEN +5 VOLT SUPPLY WORKING GREEN +15 VOLT SUPPLY WORKING GREEN...
Page 118 Figure F.56 – Input power board test point locations JIP2 JIP2 Table F.28 – Input power board test points LOW LEVEL POWER SUPPLIES PRODUCED FROM THE INPUT POWER BOARD FOR OTHER BOARDS IN THE ASPECT 375 PLUG TEST POINT TEST POINT...
Page 119 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CONTROL BOARD TEST (continued) Table F.29 – AC switch control board commands logic TEST POINT TEST POINT EXPECTED READINGS CONDITIONS PIN 24 (LEAD 29) PIN 2 (LEAD 6) +15 VDC = OFF 0 VDC COMMAND = NEGATIVE POTENTIAL SHOULD BE 0 VDC = ON SEEN ON THE ELECTRODE TO WORK STUD.
Page 120 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CONTROL BOARD TEST (continued) Figure F.57 – Plug JC1 pin and lead locations 23 24 Figure F.58 – 6 pin remote control connector 6 PIN REMOTE CONTROL CONNECTOR F-94...
Page 121 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CONTROL BOARD TEST (continued) Figure F.59 – User interface board remote light location REMOTE (GREEN) Table F.31 – JC4 molex pin TEST POINT TEST POINT REMOTE DEVICE EXPECTED RESULTS POSITION PLUG JC4 PIN 4 (LEAD 77A) PLUG JC4 PIN 3 (LEAD 76A) PEDAL RELAXED (OFF) +10 VDC...
Page 122 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CONTROL BOARD TEST (continued) Figure F.60 – JC4 molex pin F-96...
Page 123: 115V Auxiliary Board Test
115V AUXILIARY BOARD TEST WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 124 INPUT POWER SECTION TEST 12. Locate plug J3 on the 115V auxiliary board. See Figure F.64. 1. Remove the input power to the Aspect 375 machine. See Wiring Diagram. 2. Perform the Case Cover Removal Procedure.
Page 125 OUTPUT POWER SECTION TESTING THERMOSTAT SECTION TESTING 16. Locate plug J1 on the 115V auxiliary board. See Figure F.63. 20. Remove the input power to the Aspect 375 machine. See Wiring Diagram. 21. Perform the Capacitor Discharge Procedure. 17. Using a digital volt/ohmmeter set to AC volts, measure normal 22.
Page 126 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR 115V AUXILIARY BOARD TEST (continued) Table F.32 – 115V auxiliary board LEDs LED# COLOR FUNCTION ERROR CODE (LED WILL FLASH CODE) GREEN ILLUMINATED WHEN NO ERRORS HAVE OCCURRED. GREEN BOARD POWER SUPPLY IS WORKING. GREEN +15 V INPUT IS PRESENT.
Page 127 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR 115V AUXILIARY BOARD TEST (continued) Figure F.64 – 115V auxiliary board pin and lead locations 32A 32 Table F.34 – Input power section tests BOARD POWER SUPPLY TEST POINT TEST POINT EXPECTED RESULTS LOW DC POWER PLUG J3 PIN 2 (LEAD 342) PLUG J3 PIN 1 (LEAD 346) +15 VDC...
Page 128 ASPECT ™ 375 NOTES F-102...
Page 129: Vdc Bus Capacitor Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 130 REMOVAL PROCEDURE head in place (not rotating) while removing the capacitor bracket. 1. Remove the input power to the Aspect 375 machine. 11. Using a 3/8” nutdriver with an extension, remove the locknut 2. Perform the Case Cover Removal Procedure.
Page 131 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR 400 VDC BUS CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.66 – High frequency board mounting screws HIGH FREQUENCY BOARD BRACKET MOUNTING SCREWS Figure F.67 – Capacitor bracket LOCKNUT CAPACITOR BRACKET F-105...
Page 132: Replacement Procedure
ASPECT ™ 375 TROUBLESHOOTING AND REPAIR 400 VDC BUS CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) 7. Connect leads 346, 346A, 621 and 611 to the negative terminal REPLACEMENT PROCEDURE of the 400 VDC bus capacitor. See Wiring Diagram. Torque the 1.
Page 133: Output Diode Module Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 134 8. Using a Torx nutdriver (size T20), remove the thirty remaining REMOVAL PROCEDURE screws and washers securing the bus bars to the output diode 1. Remove the input power to the Aspect 375 machine. modules. See Figure F.68. 2. Perform the Case Cover Removal Procedure.
Page 135 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT DIODE MODULE REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.69 – Output diode module orientation and mounting screw locations OUTPUT DIODE MODULE MOUNTING SCREWS (2 PER MODULE) SLOT TO POINT LEFT 10. Using a Torx nutdriver (size T20), attach leads 214 and 213 and REPLACEMENT PROCEDURE associated washers to the top output diode modules.
Page 136 ASPECT ™ 375 NOTES F-110...
Page 137: Discharge Power Resistor'sremoval And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 138 LEAD 231 (FROM THE OUTPUT BOARD) REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Using a Torx nutdriver (size T20), label and disconnect the eight screws securing the leads 231 and 232 to the discharge power resistors.
Page 139 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR DISCHARGE POWER RESISTOR’S REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.71 – Discharge power resistor mounting screw locations DISCHARGE POWER RESISTOR MOUNTING SCREWS (2 PER RESISTOR) REPLACEMENT PROCEDURE 1. Clean the heat sink mating surface. 2.
Page 140 ASPECT ™ 375 NOTES F-114...
Page 141: Voltage Doubler Rectifier Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 142 (continued) Figure F.72 – Voltage doubler rectifier lead connections REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Using a Torx nutdriver (size T20), label and disconnect the screws securing leads 213, 214, X6A and X7A to the voltage doubler rectifier.
Page 143 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR VOLTAGE DOUBLER RECTIFIER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.73 – Voltage doubler rectifier orientation and mounting screw locations VOLTAGE DOUBLER RECTIFIER MOUNTING SCREWS (2) SLOT TO POINT RIGHT REPLACEMENT PROCEDURE 1. Clean the heat sink mating surface. 2.
Page 144 ASPECT ™ 375 NOTES F-118...
Page 145: Input Rectifier Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 146 Figure F.74 – Input rectifier lead locations – REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Using a phillips screwdriver, label and disconnect leads 601, 602, AA, 1A, 1B, BB, 2A, 2B, CC, 3A, 3B from the input rectifier.
Page 147 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT RECTIFIER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.75 – Input rectifier mounting screws TORX TORX MOUNTING MOUNTING SCREW SCREW – REPLACEMENT PROCEDURE 1. Clean the heat sink surface. 2. Apply a coating of Dow Corning 340 between the heat sink and the input rectifier.
Page 148 ASPECT ™ 375 NOTES F-122...
Page 149: Gas Solenoid Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 150 GAS HOSE CONNECTION REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Label and disconnect leads 410 and 411 from the gas solenoid.
Page 151 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR GAS SOLENOID REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.77 – Gas solenoid mounting nut GAS SOLENOID MOUNTING NUT AND WASHER REMOVAL PROCEDURE 1. Carefully position the new gas solenoid into the case back of the machine.
Page 152 ASPECT ™ 375 NOTES F-126...
Page 153: Output Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 154 REMOVAL PROCEDURE 12. Using a Torx nutdriver (size T25), remove the four screws and 1. Remove the input power to the Aspect 375 machine. washers securing the output board to the machine. See Figure 2. Perform the Case Cover Removal Procedure.
Page 155 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.79 – Output choke bus bar removal OUTPUT CHOKE MOUNTING BOLT BUS BAR LEAD BUS BAR GROUND LEAD MOUNTING MOUNTING SCREW SCREWS (2) Figure F.80 – Output board mounting screws and bus bar removal BUS BAR MOUNTING LEAD 214...
Page 156 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) 8. Using a 7/16” nutdriver and a 7/16” open end wrench, attach the REPLACEMENT PROCEDURE bolt, nut and washer securing the bus bar to the output choke. 1.
Page 157: Buck/Boost Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 158 IND1 W70X1076rev02 L16392-1 REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Using a Torx nutdriver (size T20), disconnect the six screws, lockwashers and washers securing the leads to the buck/boost board.
Page 159 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR BUCK/BOOST BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.82 – Buck/boost board mounting screw locations BOOST C4AT IND2 DCIN+ DCIN IND1 W70X1076rev02 L16392-1 MOUNTING SCREWS, LOCK WASHERS AND WASHERS (6 TOTAL) REPLACEMENT PROCEDURE 1. Carefully position the new buck/boost board into the machine. 2.
Page 160 ASPECT ™ 375 NOTES F-134...
Page 161: Buck & Boost Ptc Thermistors Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 162 THERMISTOR BUCK PTC THERMISTOR REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Perform the Buck/Boost Board Removal Procedure. 5. Using a 5/16” open end wrench, remove the PTC thermistor from the machine.
Page 163 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR BUCK & BOOST PTC THERMISTORS REMOVAL AND REPLACEMENT PROCEDURE (continued) REPLACEMENT PROCEDURE 1. Apply a small amount of Dow Corning 340 heat sink compound to the PTC thermistor. 2. Carefully position the new PTC thermistor into the machine and tighten by hand.
Page 164 ASPECT ™ 375 NOTES F-138...
Page 165: Buck And Boost Module Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 166 BUCK MODULE LEAD 179G REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Perform the Buck/Boost Board Removal Procedure. 5. Label and disconnect leads 179E and 179G from the buck and/ or boost module(s) to be removed.
Page 167: Mounting Screws
ASPECT ™ 375 TROUBLESHOOTING AND REPAIR BUCK AND BOOST MODULE REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.85 – Buck and boost module mounting screw locations MOUNTING SCREWS (4 PER MODULE) BOOST MODULE BUCK MODULE REPLACEMENT PROCEDURE 1. Clean the mating surface before positioning the new module(s) into the machine.
Page 168 ASPECT ™ 375 NOTES F-142...
Page 169: Inverter Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 170 9. Using a phillips screwdriver, remove the two screws securing the REMOVAL PROCEDURE inverter board to the power rectifier modules. See Figure F.87. 1. Remove the input power to the Aspect 375 machine. Note washer placement for reassembly. 2. Perform the Case Cover Removal Procedure.
Page 171 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INVERTER BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.87 – Inverter board mounting screws = MOLEX PIN 1 IGBT MODULE MOUNTING IGBT MODULE SCREWS (4 TOTAL) (4 PER MODULE, 16 TOTAL) POWER RECTIFIER POWER MODULE MOUNTING RECTIFIER SCREWS (2)
Page 172 ASPECT ™ 375 NOTES F-146...
Page 173: Inverter Igbt's And Power Rectifier Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 174 POWER RECTIFIER MODULE MOUNTING SCREWS (2) REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Perform the Inverter Board Removal Procedure. 5. Using a 7/64” allen wrench, remove the two screws securing the desired inverter IGBT(s) to the machine (four modules and eight screws total).
Page 175 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INVERTER IGBT’S AND POWER RECTIFIER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.89 – Module orientation REPLACEMENT PROCEDURE 1. Clean the heat sink mating surface. 2. Apply a coating of Dow Corning 340 heat sink compound between the heat sink, the inverter IGBTs and the power rectifier.
Page 176 ASPECT ™ 375 NOTES F-150...
Page 177: Input Control Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 178 Figure F.90 – Top tray location TOP TRAY REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Carefully maneuver the top tray into the upright position by tilting the top tray up and to the right.
Page 179 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT CONTROL BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.91 – Input control board plug locations JIP_P JIP_W JIP_S JF2 JF1 MOUNTING SCREWS (3 PER SIDE 6 TOTAL) REPLACEMENT PROCEDURE 1. Carefully position the new input power control board into the machine.
Page 180 ASPECT ™ 375 NOTES F-154...
Page 181: Input Power Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 182 Figure F.92 – Top tray location TOP TRAY REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Carefully maneuver the top tray into the upright position by tilting the top tray up and to the right.
Page 183 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR INPUT POWER BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.93 – Input power board plug locations JIP4 JIP3 JIP6 JIP5 JIP2 JIP7 JIP8 JIP1 MOUNTING SCREWS (4 PER SIDE 8 TOTAL) REPLACEMENT PROCEDURE 1. Carefully position the new input power board into the machine. 2.
Page 184 ASPECT ™ 375 NOTES F-158...
Page 185: High Frequency Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 186 BRACKET BOTTOM MOUNTING SCREWS REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Using a 5/16” nutdriver, remove the top forward screw securing the high frequency board mounting bracket.
Page 187 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR HIGH FREQUENCY BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.95 – High frequency board plug and mounting nut locations MOUNTING NUTS (4 TOTAL) OCI1 LED1 LED2 REPLACEMENT PROCEDURE 1. Carefully position the new high frequency board onto the high frequency board mounting bracket.
Page 188 ASPECT ™ 375 NOTES F-162...
Page 189: User Interface Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 190 G7465-1 MOUNTING SCREWS (4 TOTAL) REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Perform the Control Board Removal Procedure. NOTE: The user interface board and the control board are piggy backed together.
Page 191 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR USER INTERFACE BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.97 – Knob and flat washer locations FRONT PANEL FELT WASHER KNOB REPLACEMENT PROCEDURE 1. Carefully position the new user interface board into the machine. 2.
Page 192 ASPECT ™ 375 NOTES F-166...
Page 193: Control Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 194 Figure F.98 – Top tray location TOP TRAY REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Carefully maneuver the top tray into the upright position by tilting the top tray up and to the right.
Page 195 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.99 – Control board mounting screw and pc board support locations MOUNTING SCREWS (2 TOTAL) PC BOARD SUPPORTS (3 TOTAL) REPLACEMENT PROCEDURE 1. Carefully position the new control board into the machine. 2.
Page 196 ASPECT ™ 375 NOTES F-170...
Page 197: Auxiliary Board Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 198 Figure F.100 – Top tray location TOP TRAY REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Carefully maneuver the top tray into the upright position by tilting the top tray up and to the right.
Page 199 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR 115V AUXILIARY BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.101 – 115V auxiliary board plug and lead locations MOUNTING NUTS (4 TOTAL) FTP15 FTP23 FTP4 FTP14 FTP5 R160 R190 FTP30 FTP6 MOV1 FTP1 R193 R187 R113 R142...
Page 200 ASPECT ™ 375 NOTES F-174...
Page 201: Output Choke Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 202 7. Using a 5/16” nutdriver, remove the three screws securing the REMOVAL PROCEDURE output choke to the mid shelf assembly. The choke mounting 1. Remove the input power to the Aspect 375 machine. screws are located by the bus capacitor. See Figure F.105. 2. Perform the Case Cover Removal Procedure.
Page 203 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT CHOKE REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.103 – High frequency board mounting bracket screw locations HIGH FREQUENCY BOARD BRACKET MOUNTING SCREWS Figure F.104 – Output choke connections LEAD 206A AND HEAVY BRAIDED LEAD OUTPUT BUS BAR CONNECTION F-177...
Page 204 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR OUTPUT CHOKE REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.105 – Output choke mounting screw locations (view from top) MID SHELF OUTPUT CHOKE ASSEMBLY MOUNTING SCREWS (2) (VIEWED FROM TOP) REPLACEMENT PROCEDURE 1. Carefully position the new output choke into the machine. 2.
Page 205: Main Transformer Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 206: Mounting Nuts
12. Using a 3/8” nutdriver, remove the four mounting nuts securing REMOVAL PROCEDURE the main transformer to the machine. See Figure F.110. 1. Remove the input power to the Aspect 375 machine. 13. The main transformer can be remove and replaced. 2. Perform the Case Cover Removal Procedure.
Page 207 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR MAIN TRANSFORMER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.107 – Lead H1 and H2 lead connection locations = MOLEX PIN 1 TERMINAL TA (LEAD H1) TERMINAL TR1 (LEAD H2) Figure F.108 – Output stud lead connection location OUTPUT STUD (LEAD CONNECTIONS ON THE REAR)
Page 208 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR MAIN TRANSFORMER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.109 – Leads X1, X8, X3, X5 and plug J03 locations LEADS X1 AND X8 LEADS X3 AND X5 PLUG J03 Figure F.110 – Main transformer mounting nut locations MAIN TRANSFORMER (VIEWED FROM TOP) MAIN TRANSFORMER...
Page 209 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR MAIN TRANSFORMER REMOVAL AND REPLACEMENT PROCEDURE (continued) REPLACEMENT PROCEDURE 1. Carefully position the new main transformer into the machine. 2. Using a 3/8” nutdriver, attach the four mounting nuts securing the main transformer to the machine. 3.
Page 210 ASPECT ™ 375 NOTES F-184...
Page 211: Fan(S) Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 212 L16392-1 12. The fans can now be removed and replaced. REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Perform the High Frequency Board Removal Procedure.
Page 213 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR FAN(S) REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.112 – 400 VDC capacitor positive terminal location POSITIVE TERMINAL MOUNTING NUTS AND WASHERS Figure F.113 – Input rectifier lead locations INPUT RECTIFIER – F-187...
Page 214 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR FAN(S) REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.114 – Fan bracket mounting screw locations FAN ORIENTATION INDICATORS UPPER FAN BRACKET MOUNTING SCREWS (2 PER SIDE, 4 TOTAL) LOWER FAN BRACKET MOUNTING SCREWS (2 PER SIDE, 4 TOTAL) FRONT REPLACEMENT PROCEDURE 1.
Page 215: High Frequency Transformer Removal And Replacement Procedure
REMOVAL AND REPLACEMENT PROCEDURE WARNING Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 216 Figure F.115 – Electrode stud location ELECTRODE STUD (LEAD CONNECTION ON REAR) REMOVAL PROCEDURE 1. Remove the input power to the Aspect 375 machine. 2. Perform the Case Cover Removal Procedure. 3. Perform the Capacitor Discharge Procedure. 4. Perform the High Frequency Board Removal Procedure.
Page 217 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR HIGH FREQUENCY TRANSFORMER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.116 – Corner cap mounting screw and washer locations HIGH FREQUENCY TRANSFORMER CORNER CAP (4) CORNER CAP MOUNTING SCREWS AND WASHERS (2 PER CAP, 8 TOTAL) Figure F.117 –...
Page 218 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR HIGH FREQUENCY TRANSFORMER REMOVAL AND REPLACEMENT PROCEDURE (continued) Figure F.118 – High frequency transformer mounting screw locations HIGH FREQUENCY TRANSFORMER MOUNTING SCREWS REPLACEMENT PROCEDURE 1. Carefully position the new high frequency transformer into the machine.
Page 219: Retest After Repair Procedure
Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. TEST DESCRIPTION This procedure will aid the technician in testing the output of the Aspect 375 after the repair or replacement of a component or PC board. MATERIALS NEEDED Resistive Load Bank Two Welding Cables - 20 Ft.
Page 220 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR RETEST AFTER REPAIR PROCEDURE (continued) Table F.36 – Rated output and output range RATED OUTPUT INPUT POWER RATED OUTPUT CURRENT DUTY CYCLE AND VOLTAGE PHASE VOLTAGE FREQUENCY GTAW 250 A / 20 V 100% SMAW 250 A / 30 V GTAW 300 A / 22 V THREE PHASE...
Page 221: Calibration And Verification Procedure
Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877. TEST DESCRIPTION This procedure will aid the technician in checking and, if necessary, adjusting the calibration of the Aspect 375. Calibration should be checked as part of the Retest After Repair. MATERIALS NEEDED Resistive Load Bank Two Welding Cables - 20 Ft.
Page 222 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.119 – 6 pin remote receptacle location 6-PIN REMOTE RECEPTACLE PROCEDURE CALIBRATION PROCEDURE 1. Turn the welder OFF. 1. Verify that the machine is in calibration mode. See Figure F.120. 2.
Page 223 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.120 – Calibration mode CAL I PROC 8. Press the ‘SEL’ button to complete the current calibration. The VERIFICATION PROCEDURE display will show the current setting. See Figure F.127. 1.
Page 224 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.121 – Calibration flow chart CALIBRATION PROCEDURE Key stroke to get in the calibration menu - Press the ‘AC Wave Shape’, ‘SEL’ and ‘Pulse’ buttons on Power Up will take users to Calibration Procedure.
Page 225 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.122 – Current range CUR? Figure F.123 – Current adjustment ISET F-199...
Page 226 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.124 – Output enable OUTP ENDL Figure F.125 – Output adjust ADJT F-200...
Page 227 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.126 – Output adjustment ADJT Figure F.127 – Current setting CURR F-201...
Page 228 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.128 – Voltage calibration MSTR 26.7 Figure F.129 – Voltage and current readings 26.8 F-202...
Page 229 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.130 – Calibration complete CALI COMP Figure F.131 – True value reading F-203...
Page 230 ASPECT ™ 375 TROUBLESHOOTING AND REPAIR CALIBRATION AND VERIFICATION PROCEDURE (continued) Figure F.132 – 200 amp preset verification reading 25.6 F-204...
Page 231 ASPECT ™ 375 DIAGRAMS TABLE OF CONTENTS - DIAGRAMS SECTION - Diagrams ..........................Section G Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-2...
Page 232: Electrical Diagrams
ELECTRICAL DIAGRAMS WIRING DIAGRAM - ENTIRE MACHINE - CODE 12165 WIRING DIAGRAM - ASPECT 375 GENERAL INFORMATION CAVITY NUMBERING SEQUENCE (VIEWED FROM COMPONENT SIDE OF P.C. BOARD) ELECTRICAL SYMBOLS PER E1537 LEAD COLOR CODING B - BLACK Y - YELLOW...
Page 233 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.
Page 234 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.
Page 235 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.

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