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RETURN TO MAIN INDEX
SVM138-A
June, 1998
LN-9 GMA Wire Feeder
For use with machines having Code Numbers: 9100 and Above
Safety Depends on You
Lincoln arc welding equipment
is designed and built with safety
in mind. However, your overall
safety can be increased by
proper installation. . . and
thoughtful operation on your
part. DO NOT INSTALL,
OPERATE OR REPAIR THIS
EQUIPMENT WITHOUT READ-
ING THIS MANUAL AND THE
SAFETY PRECAUTIONS CON-
TAINED THROUGHOUT. And,
most importantly, think before
you act and be careful.
SERVICE MANUAL
World's Leader in Welding and Cutting Products
Premier Manufacturer of Industrial Motors
• Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

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Summary of Contents for Lincoln Electric SVM138-A

  • Page 1 RETURN TO MAIN INDEX SVM138-A June, 1998 LN-9 GMA Wire Feeder For use with machines having Code Numbers: 9100 and Above Safety Depends on You Lincoln arc welding equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation.
  • Page 2: Safety

    Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199. BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE PERFORMED ONLY BY QUALIFIED INDIVIDUALS.
  • Page 3: Electric Shock Can Kill

    ELECTRIC SHOCK can kill. 3.a. The electrode and work (or ground) circuits are electrically “hot” when the welder is on. Do not touch these “hot” parts with your bare skin or wet clothing. Wear dry, hole-free gloves to insulate hands.
  • Page 4 WELDING SPARKS can cause fire or explosion. 6.a. Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding sparks from starting a fire. Remember that welding sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas.
  • Page 5 PRÉCAUTIONS DE SÛRETÉ Pour votre propre protection lire et observer toutes les instructions et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté générales suiv- antes: Sûreté Pour Soudage A L’Arc Protegez-vous contre la secousse électrique: Les circuits à...
  • Page 6: Table Of Contents

    MASTER TABLE OF CONTENTS Safety ...i-iv Installation...Section A Technical Specifications ...A-2 Installing the LN-9GMA 2-Roll and 4-Roll Models ...A-3 Installing the LN-9F GMA 2-Roll and 4-Roll Models ...A-3 Electrical Connections - LN-9 GMA and LN-9F GMA...A-4 Machine Grounding...A-12 Work Cable Connection ...A-12 Connecting the Gun Cable to the Wire Feeder ...A-13 Hooking Up GMA Shielding Gas...A-14 Operation...Section B...
  • Page 7 MASTER TABLE OF CONTENTS Troubleshooting ...Section F How to Use Troubleshooting Guide ...F-2 PC Board Troubleshooting Procedures...F-3 Troubleshooting Guide ...F-4 Electrical Diagrams ...Section G Parts ...P289 Series RETURN TO MAIN INDEX LN-9 GMA Wire Feeder (cont’d)
  • Page 8 NOTES LN-9 GMA Wire Feeder...
  • Page 9: Installation Section

    Section A-1 - INSTALLATION SECTION - Installation Technical Specifications ...A-2 Installing the LN-9GMA 2-Roll and 4-Roll Models ...A-3 Attaching the Wire Reel stand...A-3 Mounting the Unit ...A-3 Installing the LN-9F GMA 2-Roll and 4-Roll Models ...A-3 Mounting the Wire Feed Unit...A-3 Mounting the Control Box ...A-3 Connecting the Wire Feed Unit to the Control Box ...A-3 Routing the Electrode ...A-4...
  • Page 10: Installation

    TECHNICAL SPECIFICATIONS Supplied by power source: 115 VAC, 50/60 Hz., 350 VA 80 to 980 inches per minute (2.03 to 24.9 meters per minute) VOLTAGE CONTROL RANGE OPERATION: - 20 - 40 STORAGE: - 40 0.023 through 1/16 0.045 through 5/64 LN-9 GMA (2 ROLL) LN-9 GMA (4 ROLL) LN-9F GMA Control Box...
  • Page 11: Installing The Ln-9Gma 2-Roll And 4-Roll Models

    INSTALLING THE LN-9 GMA 2-ROLL AND 4-ROLL MODELS ATTACHING THE WIRE REEL STAND Both the 2-Roll and 4-Roll LN-9 GMA are shipped with- out the wire reel stand attached. The screws and wash- ers for mounting the wire reel stand are included with the LN-9 GMA (fastened in their respective mounting holes).
  • Page 12: Routing The Electrode

    ROUTING THE ELECTRODE The electrode supply may be either from reels, Readi- Reels, spools, or bulk packaged drums or reels. Observe the following precautions: • The electrode must be routed to the wire feed unit so that the bends in the wire are at a minimum. The force required to pull the wire from the reel into the wire feed unit must be kept at a minimum.
  • Page 13: Connecting The Power Input Cable Assembly To Power Sources

    FIGURE A.2 – STRAIN RELIEF CLAMP CONNECTING THE POWER INPUT CABLE ASSEMBLY TO THE LN-9F CONTROL 1. See Figure A.3. Connect the polarized plug of the K196, K595, or K596 control cable to the mating MS-type connector on the bottom of the LN-9F GMA control box.
  • Page 14 INSTALLATION Figure A.8 is a connection diagram for connecting the LN-9 GMA to V300 power sources. The connection is made with a K596 cable assembly, which has an amphenol connection rather than a terminal strip con- nection at the power source. Depending on the power source and process you are using, the jumpers on the LN-9 GMA voltage board may have to be changed.
  • Page 15 FIGURE A.4 – CONNECTION OF LN-9 GMA TO DC-250, DC-400, and CV/CVI POWER SOURCES ELECTRIC SHOCK can kill. Above diagram shows electrode connected positive. To change polarity, turn power off, reverse the electrode and work leads at the power source and position the switch on power source to proper polarity. * Does not apply to DC-400 below code 9200 with polarity switch.
  • Page 16 FIGURE A.5 – CONNECTION OF LN-9 GMA TO DC-600 POWER SOURCES ELECTRIC SHOCK can kill. Above diagram shows electrode connected positive. To change polarity, turn power off, reverse the electrode and work leads at the power source and position the switch on power source to proper polarity. For optimum performance with the LN-9 GMA, DC-600’s with codes 8288 and above are preferred.
  • Page 17 FIGURE A.6 – CONNECTION OF LN-9 GMA TO DC-1000 POWER SOURCES ELECTRIC SHOCK can kill. Above diagram shows electrode connected positive. To change polarity, turn power off, reverse the electrode and work leads at the power source, position the positive - negative switch on power source to correspond to the polarity of the electrode cable connection. N.A.
  • Page 18 A-10 FIGURE A.7 – CONNECTION OF LN-9 GMA TO PULSE POWER 500 POWER SOURCES ELECTRIC SHOCK can kill. Above diagram shows electrode connected positive. To change polarity, turn power off, reverse the electrode and work leads at the power source and properly set the feeder polarity switch. N.A.
  • Page 19 A-11 FIGURE A.8 – CONNECTION OF LN-9 GMA TO V300 POWER SOURCES ELECTRIC SHOCK can kill. ELECTRODE CABLE TO LN-9 GMA TO WORK INVERTEC POWER SOURCE WITH 110/115V AUX. N.A. Welding cable must be sized for current and duty cycle of application. N.B.
  • Page 20: Machine Grounding

    A-12 MACHINE GROUNDING LN-9 GMA wire feeders are grounded to the power source through the input cable. The power source grounding cable must be properly connected to electri- cal ground. See your power source operating manual for details. WORK CABLE CONNECTION Connect a work lead of sufficient size and length between the proper output terminal on the power source and the work.
  • Page 21: Connecting The Gun Cable To The Wire Feeder

    A-13 CONNECTING THE GUN CABLE TO THE WIRE FEEDER A variety of gun and cable assemblies are available for the LN-9 GMA models. See the Accessories section of this manual. Lay the cable out straight. Insert the connector on the welding conductor cable into the brass conductor block on the front of the wire drive unit.
  • Page 22: Hooking Up Gma Shielding Gas

    A-14 HOOKING UP GMA SHIELDING WARNING CYLINDER damaged. • Gas under pressure is explosive. •· Always keep gas cylinders in an upright position and always keep them chained to the undercarriage or a stationary support. FIGURE A.10 – SHIELDING GAS HOOKUP INSTALLATION See American National Standard Z-49.1, "Safety in Welding and Cutting,"...
  • Page 23: Operation Section

    Section B-1 - OPERATION SECTION - Operation Operating Instructions ...B-2 Safety Precautions ...B-2 General Description ...B-3 Recommended Processes and Equipment...B-3 K424 LN-9 GMA 2-Roll and K568-1 LN-9 GMA 4-Roll...B-3 K436 LN-9F GMA 2-Roll and K538-1 LN-9 GMA 4-Roll ...B-3 DC Constant Voltage Power Sources ...B-4 Controls and Settings...B-5 Circuit Protection and Automatic Shutdown ...B-8 Avoiding Grounding Lead Protector (GLP) Shutdown...B-8...
  • Page 24: Operation

    OPERATING INSTRUCTIONS Read and understand this entire section of operating instructions operating the machine. SAFETY PRECAUTIONS OPERATION WARNING ELECTRIC SHOCK can kill. • Do not touch electrically live parts such as output terminals or internal wiring. • Insulate yourself from the work and ground.
  • Page 25: General Description

    GENERAL DESCRIPTION The LN-9 GMA 2-Roll and 4-Roll semiautomatic wire feeder models feature the precise "set and forget" dig- ital procedure control and the other welding and oper- ator features pioneered by the original LN-9 models. In addition, the LN-9 GMA models also have the fol- lowing advantages for small wire gas metal arc weld- ing with solid or flux cored Outershield •...
  • Page 26: Dc Constant Voltage Power Sources

    OPERATION DC CONSTANT VOLTAGE POWER SOURCES The following welding system power sources are avail- able for use with all LN-9 GMA models: The Idealarc ® DC-250, DC-400, CV-400, CV-500 and, DC-600 are recommended for use with any LN-9 GMA model, as well as the Pulse Power 500, Invertec V300, and DC650 Pro, with the installation of the optional K442-1 Pulse Power Filter Kit.
  • Page 27: Controls And Settings

    CONTROLS AND SETTINGS Operator controls for LN-9 GMA models are shown in Figure B.3. Controls for LN-9F models are shown in Figure B.4. Refer to these figures and the following descriptions of the controls. ELECTRODE POLARITY SWITCH: The polarity switch is located inside the wire drive section on the LN-9 GMA model and on the front panel of both the LN-9F GMA 2-Roll and 4-Roll control box.
  • Page 28 OPERATION FIGURE B.3 – WIRE FEEDER CONTROLS FOR LN-9 GMA LN-9 GMA Wire Feeder...
  • Page 29 OPERATION FIGURE B.4 – WIRE FEEDER CONTROLS FOR LN-9F GMA LN-9 GMA Wire Feeder...
  • Page 30: Circuit Protection And Automatic Shutdown

    CIRCUIT BREAKER AND GROUNDING LEAD PRO- TECTOR (GLP) RESET SWITCH: These protection circuit devices are located on the front rail of the LN-9 GMA model and bottom panel of the LN-9F models. See the topic "Circuit Protection and Automatic Shutdown" later in this section of the manual. DIGITAL METER: A three-digit digital meter is provid- ed to set and monitor the welding procedure.
  • Page 31 If such a grounding lead fault occurs, the meter will still be on and will be reading. The trigger circuit will not operate, however. To release the circuit, press the "GLP Reset" button. See Figure B.3 or B.4 for the location of this button.
  • Page 32: Drive Roll Installation

    B-10 DRIVE ROLL INSTALLATION CHANGING DRIVE ROLLS FOR 2-ROLL WIRE FEEDERS To change drive rolls on a 2-roll wire feeder, refer to Figure B.5 and perform the following steps. NOTE: Although an LN-9 GMA model is shown in Figure B.5, the following procedure also applies to LN-9F GMA models.
  • Page 33 B-11 FIGURE B.5 – INSTALLING DRIVE ROLLS ON A 2-ROLL FEEDER DRIVE ROLL HALVES GUIDE TUBE DETAIL OUTGOING GUIDE TUBE INSERT OPERATION CLAMPING COLLAR SPACER (IF REQ'D) OUTPUT SHAFT LARGE RADIUS OUTGOING GUIDE TUBE IDLE ROLL SMALL RADIUS LN-9 GMA Wire Feeder B-11 DRIVE ROLL...
  • Page 34: Changing Drive Rolls For 4-Roll Wire Feeders

    B-12 CHANGING DRIVE ROLLS FOR 4-ROLL WIRE FEEDERS To change drive rolls on a 4-roll wire feeder, refer to Figure B.6 and perform the following steps. NOTE: Although an LN-9 GMA model is shown in Figure B.6 , the following procedure also applies to LN-9F GMA models.
  • Page 35 B-13 FIGURE B.6 – INSTALLING DRIVE ROLLS ON A 4-ROLL FEEDER DRIVE ROLL HALVES GUIDE TUBE DETAIL OUTGOING GUIDE TUBE INSERT OPERATION CLAMPING COLLAR SPACER (IF REQUIRED) OUTPUT OUTPUT SHAFT SHAFT LARGE RADIUS OUTGOING GUIDE TUBE IDLE ROLL SMALL RADIUS LN-9 GMA Wire Feeder B-13 DRIVE...
  • Page 36: Wire Loading

    B-14 WIRE LOADING Loading a 22 to 30 Lb. (10 to 14 kg) Readi-Reel Package Using the Molded Plastic K363-P Readi-Reel Adapter: The Spindle should be located in the LOWER mounting hole. 1) Depress the Release Bar on the Retaining Collar and remove it from the spindle.
  • Page 37: Loading A 10 To 30 Lb. Spool

    B-15 LOADING A 10 TO 30 LB. (4.5 TO 14 KG) SPOOL (12" DIAMETER) OR 13 - 14 LB. (6 KG) INNERSHIELD COIL: The Spindle should be located in the LOWER mounting hole. (For 8" (200 mm) spools, a K468 spindle adapter must first be slipped onto spindle.) (For 13-14 lb.
  • Page 38: Loading 50 To 60 Lb. Coils

    B-16 LOADING 50 AND 60 LB. COILS ON 1” SPINDLE (K299 or K303 Wire Reel Stand) ADJUSTABLE WIRE REEL BRAKE The mount for standard 50 and 60 pound electrode coils includes a two position brake assembly. Generally the brake should be a the inner position (nearest to the wire reel shaft) for wire feed speeds below 400 in/min.
  • Page 39 B-17 FEEDING ELECTRODE AND BRAKE ADJUSTMENT 1. Turn the reel until the free end of the electrode is accessible. 2. While tightly holding the electrode, cut off the bent end. Straighten the first 6 inches. 3. Cut off the first inch. Insert the free end through the incoming guide tube.
  • Page 40: Idle Roll Pressure Setting

    2-ROLL WIRE FEEDERS 1. Press the end of the gun against a solid object that is electrically isolated from the welder output and press the gun trigger for several seconds. 2. If the wire "birdnests," jams or breaks at the drive roll, the idle roll pressure is too great.
  • Page 41: Adjust The Power Source

    B-19 MAKING A TEST WELD AND ADJUSTING LN-9 GMA RESPONSE AND STARTING CHARACTERISTICS ADJUST THE POWER SOURCE DC-250, DC-400, or DC-600 1. Connect electrode lead to terminal of desired polarity. 2. Set toggle switch to same polarity as the electrode cable connection.
  • Page 42: Voltage Control Response

    B-20 VOLTAGE CONTROL RESPONSE The LN-9 GMA is provided with selectable voltage con- trol response. Proper setting depends on the power source and process being used. Refer to the appropri- ate power source connection diagram for the proper connection of the jumpers located on the LN-9 GMA Voltage Board.
  • Page 43: Procedure At End Of Coil

    B-21 MAKING A WELD 1. Inch the electrode through the gun and cable and then cut the electrode within approximately 3/8" of the end of the contact tip for solid wire and within approximately 3/4" of the extension guide for cored wire.
  • Page 44 B-22 B-22 NOTES LN-9 GMA Wire Feeder...
  • Page 45: Auxiliary Equipment Contacts

    Section C-1 - ACCESSORIES SECTION - Accessories Auxiliary Equipment Contacts ...C-2 Optional Equipment and Accessories ...C-2 Power Input Cable Assemblies (K196, K595, K596)...C-2 Wire Reel Stands and Mountings...C-2 Gun and Cable Assemblies ...C-5 Wire Feeder Accessories ...C-5 Drive Roll and Guide Tube Kits ...C-9 TABLE OF CONTENTS LN-9 GMA Wire Feeder Section C-1...
  • Page 46: Accessories

    AUXILIARY EQUIPMENT CONTACTS The power for 115 volt AC auxiliary equipment can be obtained from the terminals inside the LN-9 GMA con- trol box. The contacts are “hot” whenever the trigger is pressed or the unit is welding. The current draw of this circuit must not exceed 1/4 ampere.
  • Page 47 ATTACHING THE WIRE REEL STANDS The mounting hardware for mounting the stands is included with the LN-9 GMA. Screws and washers are inserted in their respective mounting holes. To con- nect: 1. Remove the three 3/8 in. hex head bolts from the back of the wire feed unit.
  • Page 48 ACCESSORIES UNIVERSAL WIRE REEL STAND (K1524-1) Includes a 2" (51mm) O.D. Spindle with adjustable brake and two locations for mounting the spindle to allow for the mounting of 50 - 60lb, 10 - 30 lb, 13 - 14lb, and 8" O.D. coils with proper spindle adapters. (See OPERATION section) Capable of being mounted on the top of a suitable power source or surface without the need for any other mounting kit.
  • Page 49: Gun And Cable Assemblies

    GUN AND CABLE ASSEMBLIES A variety of standard Lincoln and Magnum gun and cable assemblies are available for the LN-9 GMA in TABLE C.1 – LN-9 GMA GUN AND CABLE ASSEMBLIES Process Model Gas Metal Arc (GMA) K426 K427 Magnum K470 Magnum K471 Magnum K478 Magnum K479...
  • Page 50 GMA TIMER KIT (K418) Provides the following functions: 1. Preflow Control - Provides flow of shielding gas to the work before the arc is established. The sole- noid valve is energized immediately when the gun trigger is closed but the time delay before the wire feeder is energized is adjustable from 0 to 1.5 seconds.
  • Page 51 SWIVEL PLATFORM (K178-1) For all LN-9 GMA wire reel stand combinations. For mounting wire feeder-wire reel stand assembly on top suitable Lincoln Idealarc Recommended input cable assembly length is 10 feet (3m) when using the K178-1. Bolt the platform to the lift bail according to instructions supplied with the platform (M16260).
  • Page 52 K58 MAGNETIC SEPARATOR The K58 is a permanent magnet type separator designed to fit the top of the standard fill funnel of the continuous flux feed system. The purpose of the separator is to remove magnetic materials such as mill scale and any other extraneous magnetic materials which may have been recovered along with the flux to be processed.
  • Page 53 TABLE C.2 – DRIVE ROLL AND GUIDE TUBE KITS Wire Size Solid Steel Electrode 0.023” - 0.025” (0.6 mm) 0.030” (0.8 mm) 0.035” (0.9 - 1.0 mm) 0.045” and 0.052” (1.2 - 1.4 mm) 0.062” (1.4 - 1.6 mm) 0.068” (1.7 mm) 5/64”...
  • Page 54 C-10 C-10 NOTES LN-9 GMA Wire Feeder...
  • Page 55: Gun And Cable Maintenance

    Section D-1 - MAINTENANCE SECTION - Maintenance Routine Maintenance ...D-2 Drive Rolls and Guide Tubes ...D-2 Wire Reel Mounting - 50 and 60 lb. Coils ...D-2 Wire Reel Mounting Readi-Reels and Spools...D-2 Periodic Maintenance ...D-2 Control Box...D-2 Wire Drive Motor and Gear Box ...D-2 Gun and Cable Maintenance ...D-3 Proper Speed Sensor Module Mounting ...D-3 Gun Cable Connector Requirements ...D-4...
  • Page 56: Maintenance

    SAFETY PRECAUTIONS WARNING ELECTRIC SHOCK can kill. • Only qualified personnel should perform this maintenance. • Turn the input supply power OFF at the disconnect switch or fuse box before working on this equipment. • Do not touch electrically hot parts. ROUTINE MAINTENANCE DRIVE ROLLS AND GUIDE TUBES After feeding any coil of wire, inspect the drive roll sec-...
  • Page 57: Gun And Cable Maintenance

    GUN AND CABLE MAINTENANCE For instructions on periodic maintenance for the weld- ing gun and cables, refer to the manual for your specif- ic model of welding gun. PROPER SPEED SENSOR MODULE MOUNTING The LN-9 GMA Speed Sensor Module is a three lead Hall-Effect switch device encased in an externally threaded housing.
  • Page 58: Gun Cable Connector Requirements

    GUN CABLE CONNECTOR REQUIRE- MENTS TO PERMIT PROPER CONNEC- TION TO LINCOLN LN-9 GMA AND LN-9F GMA WIRE FEEDER The following Figures D.2 and D.3 should serve as a guide to determine if a particular gun or switch can be connected to the LN-9 GMA and LN-9F GMA.
  • Page 59 Section E-1 -THEORY OF OPERATION SECTION- Theory of Operation ...Section E General Description ...E-2 Power Input Circuits...E-2 Trigger and Shutdown Circuit ...E-3 Arc Voltage, Wire Speed Control and Metering...E-4 Printed Circuit Board Functions...E-5 POWER SOURCE OUTPUT TRIGGER (#2 &#4) TRIGGER CIRCUIT CONNECTOR BREAKER...
  • Page 60: Theory Of Operation

    THEORY OF OPERATION GENERAL DESCRIPTION The LN-9 GMA is a semiautomatic wire feeder that allows the user to preset the arc voltage and wire feed speed. The wire feed speed is internally monitored and regulated to the preset condition. When the LN-9 GMA is coupled to an appropriate Lincoln constant voltage FIGURE E.2 –...
  • Page 61: Trigger And Shutdown Circuit

    THEORY OF OPERATION FIGURE E.3 – TRIGGER AND SHUTDOWN CIRCUIT POWER SOURCE OUTPUT TRIGGER (#2 &#4) TRIGGER CIRCUIT CONNECTOR BREAKER INPUT CONNECTOR CONTROL BOARD VOLTAGE BOARD METER 10VAC 28VAC BOARD VOLTS SPEED SWITCH TRIGGER AND SHUTDOWN CIRCUIT When the gun trigger switch is activated (closed), the trigger board completes the trigger signal path.
  • Page 62: Arc Voltage, Wire Speed Control And Metering

    THEORY OF OPERATION FIGURE E.4 – ARC VOLTAGE, WIRE SPEED CONTROL AND METERING POWER SOURCE OUTPUT TRIGGER (#2 &#4) TRIGGER CIRCUIT CONNECTOR BREAKER INPUT CONNECTOR CONTROL BOARD VOLTAGE BOARD METER 10VAC 28VAC BOARD VOLTS SPEED SWITCH ARC VOLTAGE, WIRE SPEED CONTROL AND METERING The arc voltage, which is sensed at the work piece and motor gear box, is connected through a polarity switch...
  • Page 63: Printed Circuit Board Functions

    THEORY OF OPERATION PRINTED CIRCUIT BOARD FUNCTIONS POWER BOARD The input power (115VAC) is applied to the power board, and from that the power board develops the variable DC armature voltage for the permanent mag- net wire drive motor. The SCR circuitry, used to con- trol the motor armature voltage, is also contained on the power board.
  • Page 64 NOTES LN-9 GMA Wire Feeder...
  • Page 65 Section F-1 TROUBLESHOOTING & REPAIR SECTION Troubleshooting & Repair Section ...Section F How to Use Troubleshooting Guide ...F-2 PC Board Troubleshooting Procedures ...F-3 Troubleshooting Guide ...F-4 - F-23 Test Procedures T1 Transformer Test ...F-24 T2 Transformer Test ...F-27 Wire Drive Motor Test...F-31 Hall Effect Test and Alignment...F-34 Voltmeter Accuracy Test ...F-38 Meter Circuit Accuracy Test...F-41...
  • Page 66: How To Use Troubleshooting Guide

    TROUBLESHOOTING & REPAIR HOW TO USE TROUBLESHOOTING GUIDE 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 67: Pc Board Troubleshooting Procedures

    • If the PC Board uses protective shorting jumpers, don’t remove them until installation is complete. • If you return a PC Board to The Lincoln Electric Company for credit, it must be in the static-shielding bag. This will prevent further damage and allow prop- er failure analysis.
  • Page 68: Troubleshooting Guide

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. POSSIBLE AREAS OF...
  • Page 69 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353.
  • Page 70 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 71 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353. detailed in the beginning of this manual.
  • Page 72 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 73 "OFF" position. If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 74 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 75 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. detailed in the beginning of this manual.
  • Page 76 Gun trigger is NOT activated. If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 77 PC board repeatedly fails. If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 78 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 79 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 80 "hunting." If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. detailed in the beginning of this manual.
  • Page 81 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. detailed in the beginning of this manual.
  • Page 82 The arc is unstable or oscillating. If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 83 F-19 TROUBLESHOOTING GUIDE PROBLEMS (SYMPTOMS) The SET and actual speed meter readings match within a few IPM, but both are in error. SET speed and actual speed meter readings do NOT match within a few IPM. One or both readings may be erratic.
  • Page 84 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. detailed in the beginning of this manual.
  • Page 85 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 86 Welding is good. If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
  • Page 87 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. detailed in the beginning of this manual.
  • Page 88: T1 Transformer Test

    F-24 TROUBLESHOOTING & REPAIR 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 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 89 F-25 TROUBLESHOOTING & REPAIR T1 TRANSFORMER TEST (continued) FIGURE F.1 – LEAD #532 AT POWER PC BOARD LEAD 31 TEST PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Using the phillips head screwdriver, remove the screws holding the left side cover assembly.
  • Page 90 F-26 TROUBLESHOOTING & REPAIR T1 TRANSFORMER TEST (continued) FIGURE F.2 – SECONDARY LEADS #601 AND #602 AT LEAD SPLICES 6. Using the volt/ohmmeter, check for 10VAC at secondary leads #601 and #602. Typically, these leads are yellow. Place the probes at the lead splices.
  • Page 91: T2 Transformer Test

    F-27 TROUBLESHOOTING & REPAIR 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 92 F-28 TROUBLESHOOTING & REPAIR T2 TRANSFORMER TEST (continued) FIGURE F.3 – “PROTECTION CIRCUIT TROUBLESHOOTING” NAMEPLATE TROUBLESHOOTING NAMEPLATE TEST PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Using the phillips head screwdriver, remove the screws holding the left side cover assembly.
  • Page 93 F-29 TROUBLESHOOTING & REPAIR T2 TRANSFORMER TEST (continued) FIGURE F.4 – T2 PRIMARY LEADS #32A AT 5 AMP CIRCUIT BREAKER AND #531 AT R1 RESISTOR CIRCUIT BREAKER LEAD 32A 4. Locate the T2 transformer primary lead #32A connected to the 5 amp circuit break- er.
  • Page 94 F-30 TROUBLESHOOTING & REPAIR T2 TRANSFORMER TEST (continued) FIGURE F.5 – T2 SECONDARY LEADS #621 AND #620 ON TRIGGER PC BOARD WARNING Electric Shock can kill. • With 7. Insulate the T2 transformer primary leads #531 and #32A and apply 115 VAC power. See the Wiring Diagram and Figure F.4.
  • Page 95: Wire Drive Motor Test

    F-31 TROUBLESHOOTING & REPAIR 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 96 F-32 TROUBLESHOOTING & REPAIR WIRE DRIVE MOTOR TEST (continued) FIGURE F.6 – LEAD #539 AND #541 AT POWER PC BOARD TERMINAL STRIP TEST PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Remove any electrode wire or disengage the drive rolls.
  • Page 97 F-33 TROUBLESHOOTING & REPAIR WIRE DRIVE MOTOR TEST (continued) WARNING ELECTRIC SHOCK can kill. • With 6. Apply 115 VAC power. 7. With the gun trigger activated or the gun ter- minals jumpered together (see the Wiring Diagram), check the motor armature volts at leads #541(+) and #539(-).
  • Page 98 TROUBLESHOOTING & REPAIR HALL EFFECT MODULE TEST AND ALIGNMENT 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 99 F-35 TROUBLESHOOTING & REPAIR HALL EFFECT MODULE TEST AND ALIGNMENT (continued) FIGURE F.7 – LEADS #525, #510, #555 ON CONTROL PC BOARD HALL EFFECT MODULE FEEDBACK TEST PROCEDURE 1. Remove the input power to the LN-9 GMA wire feeder. 2. Remove any electrode wire or disengage the drive rolls.
  • Page 100 F-36 TROUBLESHOOTING & REPAIR HALL EFFECT MODULE TEST AND ALIGNMENT (continued) WARNING ELECTRIC SHOCK can kill. • With 6. Apply input power to the LN-9 GMA and test for 15VDC at leads #525(+) to #510(-). This is the supply voltage from the control PC board to the hall effect module.
  • Page 101 F-37 HALL EFFECT MODULE TEST AND ALIGNMENT (continued) FIGURE F.8 – HALL EFFECT MODULE LOCATION HALL-EFFECT MODULE HALL EFFECT MODULE ALIGNMENT TEST PROCEDURE The LN-9 GMA wire speed sensor is a three lead hall-effect device encased in an externally threaded housing. It is screwed into a mounting plate on the motor side of the wire drive gear- box.
  • Page 102: Voltmeter Accuracy Test

    TROUBLESHOOTING & REPAIR VOLTMETER ACCURACY TEST 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 103 F-39 TROUBLESHOOTING & REPAIR VOLTMETER ACCURACY TEST (continued) FIGURE F.9 – VOLTMETER CONNECTION POINT TEST PROCEDURE Perform the following checks with the LN-9 GMA wire feeder connected to a Lincoln CV welding power source according to the proper connection diagram. (See the Installation section of this manual.) See Figure F.9 for this test.
  • Page 104 F-40 TROUBLESHOOTING & REPAIR VOLTMETER ACCURACY TEST (continued) WARNING ELECTRIC SHOCK can kill. • With power applied, there are high voltages inside the wire feeder. Do not reach into the wire feeder or touch any internal part of the wire feeder while power is applied.
  • Page 105: Meter Circuit Accuracy Test

    TROUBLESHOOTING & REPAIR METER CIRCUIT ACCURACY TEST 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 106 F-42 TROUBLESHOOTING & REPAIR METER CIRCUIT ACCURACY TEST (continued) FIGURE F.10 – METER PC BOARD LOCATIONS AND COVER MOUNTING SCREWS TEST PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Lift the right side cover assembly and remove the two screws holding the meter cover to the right side assembly.
  • Page 107 F-43 TROUBLESHOOTING & REPAIR METER CIRCUIT ACCURACY TEST (continued) FIGURE F.11 – METER PC BOARD TEST POINTS 510C 5. Test for AC supply to the meter PC board. Check for 8 to 11 VAC from lead #601 to #602. See Figure F.11. NOTE: The coating will have to be removed from the test points.
  • Page 108 F-44 TROUBLESHOOTING & REPAIR METER CIRCUIT ACCURACY TEST (continued) Test Digital Meter Accuracy. (For LN-9 GMA models above code 7980 with separable digital meter and meter boards only). 1. Use a test meter with at least 3-1/2 digits and ± 0.5% accuracy. 2.
  • Page 109 F-45 TROUBLESHOOTING & REPAIR METER CIRCUIT ACCURACY TEST (continued) Test Meter PC Board Wire Feed Speed Accuracy. (Metric Models Only) 1. Use a test meter with at least 3-1/2 digits and ± 0.5% accuracy. 2. Connect the + probe to lead called for in the table below and the - probe to lead #510C.
  • Page 110: Wire Speed Accuracy Test

    TROUBLESHOOTING & REPAIR WIRE SPEED ACCURACY TEST 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 111 F-47 TROUBLESHOOTING & REPAIR WIRE SPEED ACCURACY TEST (continued) TEST PROCEDURE Perform the following checks with the LN-9 GMA wire feeder connected to a Lincoln CV welding power source according to the proper connection diagram. (See the Installation section of this manual.) A.
  • Page 112: Out Of Voltage Range Shut Down Test

    TROUBLESHOOTING & REPAIR OUT OF VOLTAGE RANGE SHUT DOWN TEST 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 113 1/8 AMP FUSE 5. Connect to a Lincoln Electric CV power source per connection diagram. Installation section of this manual. 6. Start welding and observe the ACTUAL volt- age reading on the LN-9 GMA digital meter.
  • Page 114 F-50 TROUBLESHOOTING & REPAIR OUT OF VOLTAGE RANGE SHUT DOWN TEST (continued) 8. If the ACTUAL voltage reading is zero, the sensing leads may be faulty. Check the con- tinuity (zero ohms) of leads #21 and #67. Lead #21 must have continuity to the work- piece, and #67 must have continuity to the electrode.
  • Page 115: General Power Supply Tests

    TROUBLESHOOTING & REPAIR GENERAL POWER SUPPLY TESTS 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 116 F-52 TROUBLESHOOTING & REPAIR GENERAL POWER SUPPLY TESTS (continued) TEST PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Using the phillips head screwdriver, remove the screws from the left side cover assembly. 3. Lift the left side cover assembly. 4.
  • Page 117 F-53 TROUBLESHOOTING & REPAIR GENERAL POWER SUPPLY TESTS (continued) CHECKPOINT LOCATION DESCRIPTION CONTROL P.C. BOARD CONNECTOR SUPPLY FROM PLUG CONTROL P.C. CHECK - 10 VDC BOARD SUPPLY FROM CONNECTOR PLUG VOLTAGE P.C. BOARD UPPER CONNECTOR SUPPLY FROM PLUG NEXT TO "F"...
  • Page 118: Digital Meter And Meter Pc Board Removal And Replacement

    TROUBLESHOOTING & REPAIR DIGITAL METER AND METER PC BOARD REMOVAL AND 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 119 F-55 TROUBLESHOOTING & REPAIR DIGITAL METER AND METER PC BOARD REMOVAL AND REPLACEMENT (continued) METER PC BOARD REMOVAL PROCEDURE 1. Remove input power to the LN-9 GMA Wire Feeder. FIGURE F.13 – METER PANEL ASSEMBLY SCREWS METER 3. Lift the right side cover assembly. FIGURE F.14 –...
  • Page 120 F-56 TROUBLESHOOTING & REPAIR DIGITAL METER AND METER PC BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.15 – METER PC BOARD REMOVAL 5. Using the 5/16" nut driver, remove the four nuts mounting the meter PC board to the meter assembly. See Figure F.15. 6.
  • Page 121: Reed Switch (Cr2) Removal And Replacement

    TROUBLESHOOTING & REPAIR REED SWITCH (CR2) REMOVAL AND REPLACEMENT 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 122 F-58 TROUBLESHOOTING & REPAIR REED SWITCH (CR2) REMOVAL AND REPLACEMENT (continued) FIGURE F.16 – CR2 REED SWITCH LOCATION AND COMPONENTS LEAD 628 LEAD 529 SELF-TAPPING PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Lift the right side cover assembly. 3.
  • Page 123: T1 Transformer Removal And Replacement

    TROUBLESHOOTING & REPAIR T1 TRANSFORMER REMOVAL AND REPLACEMENT 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 or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 124 F-60 TROUBLESHOOTING & REPAIR T1 TRANSFORMER REMOVAL AND REPLACEMENT (continued) FIGURE F.17 – PRIMARY LEAD #31 AT R1 RESISTOR PROCEDURE 1. Remove input power to the LN-9 GMA. 2. Using the phillips head screwdriver remove the screws holding the left side cover assembly. 3.
  • Page 125 F-61 TROUBLESHOOTING & REPAIR T1 TRANSFORMER REMOVAL AND REPLACEMENT (continued) 6. Disconnect leads #526 and #527 from the power PC board terminals. See Figure F.18. FIGURE F.18 – LEADS #526 AND #527 AT POWER PC BOARD 7. Disconnect yellow leads #601 and #602 from the lead splices.
  • Page 126 F-62 TROUBLESHOOTING & REPAIR T1 TRANSFORMER REMOVAL AND REPLACEMENT (continued) 8. Remove the two phillips head screws from the control PC board mounting panel. 9. Using the 11/32" wrench, remove the nut and screw from the top of the PC board mounting panel.
  • Page 127 F-63 TROUBLESHOOTING & REPAIR T1 TRANSFORMER REMOVAL AND REPLACEMENT (continued) FIGURE F.21 – TERMINAL STRIP MOUNTING TRANSFORMER MOUNTING SCREWS 11. Using the 5/16" wrench, remove the nuts and lockwashers mounting the terminal strip to the mounting panel. See Figure F.21. 12.
  • Page 128: Drive Motor Removal And Replacement

    TROUBLESHOOTING & REPAIR DRIVE MOTOR REMOVAL AND REPLACEMENT 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 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 129 F-65 TROUBLESHOOTING & REPAIR DRIVE MOTOR REMOVAL AND REPLACEMENT (continued) FIGURE F.22 – TOP MOTOR PLATE SCREWS MOTOR GROUND LEAD PROCEDURE 1. Remove input power to the LN-9 GMA wire feeder. 2. Using the phillips head screwdriver, remove the screws holding the left side cover assembly. 3.
  • Page 130 F-66 TROUBLESHOOTING & REPAIR DRIVE MOTOR REMOVAL AND REPLACEMENT (continued) FIGURE F.23 – GLASTIC MOUNTING SCREWS NUTS AND WASHERS (4-ROLL FEEDERS) 11. Remove the three screws and lock washers that hold the glastic mounting to the LN-9 GMA floor assembly. It may be necessary to remove the copper reed switch energizer to access one of the mounting screws.
  • Page 131 F-67 TROUBLESHOOTING & REPAIR DRIVE MOTOR REMOVAL AND REPLACEMENT (continued) FIGURE F.24 – MOTOR AND WIRE DRIVE REMOVAL MYLAR INSULATOR GLASTIC MOUNTING BOARD 12. Lift the right side cover assembly and care- fully lift and slide the motor and wire drive assembly partially out of the LN-9 GMA box assembly.
  • Page 132 F-68 TROUBLESHOOTING & REPAIR DRIVE MOTOR REMOVAL AND REPLACEMENT (continued) 15. With the slot head screwdriver, remove the three screws, lock washers, flatwashers, and insulators holding the drive motor to the gear box assembly. See Figure F.25. Note their positions for reassembly. 16.
  • Page 133: Retest After Repair

    F-69 F-69 TROUBLESHOOTING & REPAIR RETEST AFTER REPAIR Retest the LN-9 GMA wire feeder: If it fails any test and the test requires removing or replacing any mechanical part that could affect the wire feeder's electrical characteristics. If you repair or replace any electrical compo- nent.
  • Page 134 F-70 F-70 NOTES LN-9 GMA Wire Feeder...
  • Page 135 ELECTRICAL DIAGRAMS TABLE OF CONTENTS -ELECTRICAL DIAGRAMS SECTION- Theory of Operation ...Section G Wiring Diagram-LN-9 GMA ...G-3 Wiring Diagram-LN-9F GMA ...G-4 Voltage Board Schematic ...G-5 Power PC Board Schematic...G-6 Trigger PC Board Schematic...G-7 PM Control Schematic...G-8 Meter Board Schematic...G-9 Operating Schematic...G-10 LN-9 GMA Wire Feeder...
  • Page 136 NOTES LN-9 GMA Wire Feeder...
  • Page 137: Wiring Diagram-Ln-9 Gma

    Wiring Diagram-LN-9 GMA V O L T S - S P E E D S E L E C T O R S W I T C H 5 1 7 5 1 0 5 1 8 5 1 6 5 6 2 5 1 8 8 9 10...
  • Page 138: Wiring Diagram-Ln-9F Gma

    Wiring Diagram-LN-9F GMA M E T E R V O L T S - S P E E D S E L E C T O R S W I T C H B O A R D P L U G D I G I T A L M E T E R 5 1 7...
  • Page 139: Voltage Board Schematic

    NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available 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.
  • Page 140: Power Pc Board Schematic

    NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available 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.
  • Page 141: Trigger Pc Board Schematic

    NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available 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.
  • Page 142: Pm Control Schematic

    NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available 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.
  • Page 143: Meter Board Schematic

    NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available 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.
  • Page 144: Operating Schematic

    NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available 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.

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Ln-9 gma

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