Lincoln Electric SVM162-B manual

PRECISION TIG 275 SER VICE MANUAL SVM162-B January , 2008 Safety Depends on Y ou Lincoln arc welding and cutting 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 INST ALL, OPERA TE OR REP AIR THIS EQUIPMENT WITHOUT REA DIN G T[...]

SAFETY i i i i Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC FOR ENGINE powered equipment. 1.a. T urn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running. ____________________________________________________ 1.b.Operate engines in open, well-ventilate[...]

SAFETY i i i i i i i i Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC FUMES AND GASES can be dangerous. 5.a. Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.When welding, keep your head out of the fume. Use enough ventilation and/or exhaust at the arc to keep fumes [...]

S S A A F F E E T T Y Y i i i i i i i i i i i i Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC Mar ʻ95 FOR ELECTRICALL Y powered equipment. 8.a. Turn off input power using the disconnect switch at the fuse box before working on the equipment. 8.b. Install equipment in accordance with the U.S. National Electrica[...]

S S A A F F E E T T Y Y i i v v i i v v Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC Mar ʻ93 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 gé[...]

v v PRECISION TIG 275 MASTER T ABLE OF CONTENTS FOR ALL SECTIONS Page Safety ................................................................................................................................................. i-iv Installation .............................................................................................................[...]

Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC A-1 A-1 T ABLE OF CONTENTS - INST ALLA TION SECTION - PRECISION TIG 275 Installation T echnical Specifications ..............................................................................................................A-2 Rated Output.............................[...]

A-2 INST ALLA TION PRECISION TIG 275 A-2 TECHNICAL SPECIFICA TIONS- PRECISION TIG 275 (Domestic, Canadian & Export V oltage + 10% 208/230/460 460/575 220-230/ 380-400/415 Max. A mps With Out Power Factor Capacitor 104/94/47 124/1 12/56 86/78/39 95/86/43 77/70/35 73/66/33 6/5/3 47/38 56/45 39/31 43/35 35/28 33/26 3/2 300W 95/55/50 109/63/58 80/4[...]

K1826-1, -2 K1827-1 K2619-1,-2 K1825-1 A-3 INST ALLA TION PRECISION TIG 275 A-3 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC ADDITIONAL OUTPUT CAP ACITY Output Current Range 2Amps DC to 340Amps AC-DC * T ype of Output CC (C[...]

A-4 PRECISION TIG 275 A-4 INST ALLA TION SAFETY PRECAUTIONS Read entire Installation Section before installing the Precision Tig 275. ELECTRIC SHOCK can kill. • Only qualified personnel should per- form this installation. • T urn the input power OFF at the disconnect switch or fuse box and discharge input capacitors before working inside the eq[...]

A-5 INST ALLA TION A-5 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC 3. Be sure the torch and work cable rubber coverings are free of cuts and cracks that allow high frequen- cy leakage. Cables with high na[...]

A-6 INST ALLA TION PRECISION TIG 275 A-6 Recommended Cable Sizes for Combined Lengths of Copper Work and Electrode Cables using 75 o C Wire: Machine Rating 0 to 100 Ft . 101 to 200 Ft 201 to 250 Ft 275A/40% #1 (42.4 mm 2 ) 1/0 (53.5 mm 2 ) 2/0 (67.4 mm 2 ) WORK CABLE CONNECTION A 15ʼ (2/0) weld cable with clamp is available (K2150-1), or included [...]

A-7 INST ALLA TION PRECISION TIG 275 A-7 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TIG TORCH CONNECTION The Precision TIG torch connection box, located on the right side of the machine, provides all the input and output [...]

A-8 INST ALLA TION PRECISION TIG 275 A-8 AUXILIAR Y POWER CONNECTIONS The Precision TIG machines provide a standard NEMA 5-15R duplex receptacle, located on the upper case back on the torch side of the machine: • The bottom outlet of this duplex receptacle provides switched 1 15V AC power for the Under-Cooler , or W ater Solenoid accessory . This[...]

A-9 INST ALLA TION PRECISION TIG 275 A-9 ROBOTIC INTERF ACE CONNECTION Robotic interface can be made at the Remote Receptacle (See Operation Section ). The machine is shipped with the remote receptacle circuit internally connected to receptacle J5 of the Control board for standard Amptrol operation. In order to enable the remote receptacle for robo[...]

A-10 NOTES PRECISION TIG 275 A-10 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

B-1 B-1 PRECISION TIG 275 Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC T ABLE OF CONTENTS - OPERA TION SECTION - Operation ............................................................................................................................... Section B Safety Precautions ...............................[...]

SAFETY PRECAUTIONS Read and understand this entire section before operat- i ng th e m a ch in e . ELECTRIC SHOCK CAN KILL. *Only qualified personnel should per- form the installation. * T urn the input power OFF at the dis- connect switch or fuse box. * Do not touch electrically live parts or electrode with skin or wet clothing. * Insulate yourself[...]

B-3 OPERA TION B-3 RECOMMENDED PROCESSES The Precision TIG 275 is recommended for the TIG (GT AW) and Stick (SMAW) welding processes within its output capacity range of 2 amps DC, or 5 amps AC, to 340 amps AC/DC. It is compatible with most Magnum TIG accessories (refer to Equipment Limitations), as well as many industry standard items, such as TIG [...]

B-4 OPERA TION B-4 1. POWER SWITCH - Input line switch turns input power ON or OFF , as indicated by the on or off sta- tus of the front panel displays. 2. POLARITY SWITCH – The 3-position rotary power switch has detente positions for DC-, AC and DC+ selections for the Electrode output welding polarity . 3. MODE SWITCH – The mode switch allows [...]

B-5 OPERA TION B-5 • When the Polarity Switch is set to DC (- or +), the TIG mode provides high frequency only for starting. • Hi-Freq. turns on after pre-flow time with the arc start switch closure, and turns off when the arc is established* • DC+ polarity can also be used for ”balling” of the tungsten for AC TIG welding. 4. AC BALANCE C[...]

B-6 OPERA TION FOR CODES ABOVE 1 1000 ONL Y B-6 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC DIGIT AL DISPLA Y DIGIT A L DISPLA Y (SET) DISPLA Y (SELECT) DISPL A Y 7 a a MENU BUTTON AND DISPLA Y SWITCH (C [...]

B-7 OPERA TION B-7 8. DIGIT AL METER AND DISPLA Y SWITCH – A 3- digit LED meter is used to monitor the preset and actual welding procedure based on the Display (momentary) switch position: • Before welding with Display switch in center (nor- mal) position, the digital meter displays the preset welding amps set by Maximum Output control knob (Se[...]

B-8 OPERA TION B-8 • The 4-Step position allows welding without contin- uously holding the start switch trigger . The arc start switch functions in the following manner: 1. Closing the switch starts preflow , then arc starts at Minimum (Start) setting level (See Item 7). If the trigger is maintained closed after preflow time the output remains at[...]

B-9 OPERA TION B-9 INTERNAL SET UP CONTROLS Precision TIG 275 models which have an Advanced Panel (K1829-1) option installed* have the following additional control features which are set up using the DIP Switch (S1) provided on the internal panel of this option. Access to this internal panel is obtained by removing the two screws securing the top c[...]

B-10 OPERA TION B-10 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC FIGURE B.3 2 Step T rigger Modes 2 Step - Restart Disabled 2 Step - Restart Enabled T orch Button Output Current Gas Pre-Flow Post Flow Nor[...]

B-11 OPERA TION B-11 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC FIGURE B.4 4 Step T rigger Modes 4 Step - Restart Enabled 4 Step - Restart Disabled T orch Button Output C urrent Gas Pre-Flow Pre-Flow Pos[...]

B-12 OPERA TION B-12 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC PREFLOW F ixed 0.5 sec or x2 S TART TIME Manual in 4-Step UPSLOPE F ixed<0.5 sec w/o Amptrol MINIMUM OUTPUT ( Start) SETTING Adjustable [...]

B-13 OPERA TION B-13 PRECISION TIG 275 FIGURE B.6 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC Max. to Mi n. Am pt rol Min. to Ma x. Ampt ro l Setup f or TIG Ampt rol Welding Advanced Panel (If used) Standa rd Controls Powe[...]

B-14 OPERA TION B-14 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC RECOMMENDED ELECTRODE AMPERAGE RANGES - PRECISION TIG 275 SMA W Process ELECTRODE POLARITY 3/32" 1/8" 5/32" Fleetweld 5P , F[...]

C-1 C-1 PRECISION TIG 275 T ABLE OF CONTENTS - ACCESSORIES - Accessories ........................................................................................................................... Section C Optional Equipment for Codes Below 1 1000 ..............................................................................C-2 Optional Equipment [...]

C-2 ACCESSORIES FOR CODES BELOW 1 1000 C-2 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC OPTIONAL EQUIPMENT F ACTORY INST ALLED OPTIONS The basic Precision TIG 275 machine is factory equipped with: • A 3/[...]

C-3 ACCESSORIES FOR CODES ABOVE 1 1000 C-3 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC OPTIONAL EQUIPMENT F ACTORY INST ALLED OPTIONS The basic Precision TIG 275 machine is factory equipped with: • A 3/[...]

C-4 NOTES PRECISION TIG 275 C-4 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

D-1 D-1 PRECISION TIG 275 Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC T ABLE OF CONTENTS -MAINTENANCE- Maintenance .......................................................................................................................... Section D Safety Precautions ...........................................[...]

D-2 MAINTENANCE D-2 PRECISION TIG 275 ELECTRIC SHOCK can kill. • Only qualified personnel should perform this maintenance. • T urn the input power OFF at the disconnect switch or fuse box before working on this equipment. • Do not touch electrically hot parts. T o avoid receiving a high frequency shock, keep the TIG torch and cables in good c[...]

D-3 MAINTENANCE D-3 SERVICE PROCEDURES Operation of the Precision TIG should be trouble-free for the life of the machine. Should a malfunction occur , however , the following procedures will be useful to trained service personnel with experience in repairing arc welding equipment: COMPONENT ACCESS The following components are accessible for routine[...]

D-4 MAINTENANCE D-4 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC 1. Case Front Assembly 2. Arc Starter and Bypass Assembly 3. Case Back Assembly 4. Center Assembly 5. Case Cover Assembly R E M O R E M O T [...]

Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC E-1 E-1 PRECISION TIG 275 Theory of Operation .............................................................................................................. Section E General Description ......... .....................................................................[...]

E-2 E-2 PRECISION TIG 275 FIGURE E.2 – GENERAL DESCRIPTION AND INPUT POWER CIRCUIT POWER SWITCH RECONNECT PANEL O PTIONAL POWER FACTOR POLARITY SWITCH B YPASS BOARD WORK FRONT E LECTRODE R EAR ELECTRODE 78 VAC X1 X2 A C AC D C DC S HUNT CHOKE HIGH FREQUENCY TRANSFORMER HIGH VOLTAGE TRANSFORMER T HERMOSTAT 1 15 VAC 115 VAC 115 VAC FAN GATE LEADS F[...]

E-3 E-3 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC OUTPUT RECTIFICA TION, CONTROL BOARD AND FEEDBACK The AC output from the main transformer secondary is rectified and controlled through the SCR bridge. [...]

E-4 E-4 PRECISION TIG 275 THEOR Y OF OPERA TION FIGURE E.4 – HIGH VOL T AGE / HIGH FREQUENCY CIRCUIT POWER SWITCH RECONNECT PANEL OPTIONAL POWER FACTOR POLARITY SWITCH BYPASS BOARD W ORK F RONT ELECTRODE REAR ELECTRODE 78 VAC X 1 X 2 A C A C DC DC S HUNT CHOKE HIGH FREQUENCY TRANSFORMER HIGH VOLTAGE TRANSFORMER T HERMOSTAT 1 15 VAC 115 VAC 115 VA[...]

E-5 E-5 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC DC WELDING OUTPUT Whe n the pola rit y swit ch is place d in eithe r DC posit ion , the AC volta ge from the mai n tra nsf orm er s eco nda ry is a ppl [...]

E-6 E-6 PRECISION TIG 275 AC WELDING OUTPUT Rotating the polarity switch to the AC position changes the welding power circuit. One lead (X1) of the main transformer secondary is connected to the machineʼs output work terminal. The other secondary lead (X2) is connected to one of the AC connections of the SCR bridge. The electrode terminal is conne[...]

E-7 E-7 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC SCR OPERA TION A silicon controlled rectifier (SCR) is a three-terminal device used to control rather large currents to a load. An SCR acts very much li[...]

E-8 E-8 PRECISION TIG 275 PROTECTION CIRCUITS Protection circuits are designed into the PRECISION T ig 275 machine to sense trouble and shut down the machine before the trouble damages internal machine components. Both thermal protection and current over- load are included. F AN-AS-NEEDED (F .A.N.) The PRECISION T ig 275 has the F .A.N. circuit fea[...]

F-1 F-1 PRECISION TIG 275 Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC T roubleshooting & Repair Section ................................................................................Section F How to Use Troubleshootin g Guide ..............................................................................[...]

F-2 F-2 PRECISION TIG 275 HOW TO USE TROUBLESHOOTING GUIDE Service and repair should be performed by only Lincoln Electric Factory T rained 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,[...]

ELECTRIC SHOCK can kill. *Have an electrician install and service this equipment. Turn the machine OFF before working on equipment. Do not touch electrically hot parts . Sometimes machine failures appear to be due to PC Board failures. These problems can sometimes be traced to poor electrical connections. T o avoid prob- lems when troubleshooting a[...]

F-4 F-4 PRECISION TIG 275 TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. 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 b[...]

F-5 F-5 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the beginning of this manual. If for any reason you do not und[...]

F-6 F-6 PRECISION TIG 275 TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. 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 b[...]

The machine has welding output in the Stick mode but no output in the TIG mode. ( no gas flow or high fre- quency). SEE NOTE BELOW 1. Make sure the Stick/TIG switch is i n t he p rope r p osit ion and operating correctly . 2. The remote control device may be faulty . 1. Check the remote control recep- tacle and associated wiring. See the Wiring Dia[...]

F-8 F-8 PRECISION TIG 275 TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. 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 b[...]

F-9 F-9 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the beginning of this manual. If for any reason you do not und[...]

F-10 F-10 PRECISION TIG 275 TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. 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[...]

F-11 F-11 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the beginning of this manual. If for any reason you do not u[...]

F-12 F-12 PRECISION TIG 275 TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. 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[...]

F-13 F-13 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the beginning of this manual. If for any reason you do not u[...]

F-14 F-14 PRECISION TIG 275 TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. 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[...]

F-15 F-15 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the beginning of this manual. If for any reason you do not u[...]

F-16 F-16 PRECISION TIG 275 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 1-888-935-3877. PROBLEMS (SYMPTOMS) POSSIBLE AREAS OF MISADJUSTMENT(S) RECOMMENDED COURSE OF A[...]

F-17 F-17 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. If for any reason you do not u[...]

F-18 NOTES F-18 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

F-19 F-19 PRECISION TIG 275 TROUBLESHOOTING & REP AIR METER CALIBRA TION ADJUSTMENTS 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 an[...]

F-20 F-20 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR METER CALIBRA TION ADJUSTMENTS (continued) CALIBRA TION CHECK The Digital Meter Calibration T rimmer is located on the b[...]

F-21 F-21 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR AMMETER CALIBRA TION PROCEDURE 1. Locate the Ammeter Calibration T rimmer (R5). See Figure F .1. 2. Set to TIG mode with[...]

F-22 F-22 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC NOTES[...]

F-23 F-23 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR HIGH FREQUENCY CIRCUIT DISABLE PROCEDURE Service and repair should be performed by only Lincoln Electric factory trained[...]

F-24 F-24 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR HIGH FREQUENCY CIRCUIT DISABLE PROCEDURE (continued) PROCEDURE 1. Remove the input power to the PRECISION TIG 275 machin[...]

F-25 F-25 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR PROTECTION BOARD TEST Service and repair should be performed by only Lincoln Electric factory trained personnel. Unautho[...]

F-26 F-26 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR PROTECTION BOARD TEST (continued) 1. Using a 3/8” nut driver , remove the case top and sides. 2. Check that P5 is conn[...]

F-27 F-27 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR T1 MAIN TRANSFORMER TEST Service and repair should be performed by only Lincoln Electric factory trained personnel. Unau[...]

F-28 F-28 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR T1 MAIN TRANSFORMER TEST (continued) TEST PROCEDURES 1. Using the 3/8” nut driver , remove the two screws from the fro[...]

F-29 F-29 PRECISION TIG 275 TROUBLESHOOTING & REP AIR T1 MAIN TRANSFORMER TEST (continued) T able F .3 - T1 T ransformer V oltages TEST POINTS ACCEPT ABLE VOL T AGES SECONDAR Y WINDINGS PLUG J1 1 PIN 8 (LEAD W209) TO PLUG J1 1 PIN 16 (LEAD R210) PLUG J1 1 PIN 7 (LEAD #201) TO PLUG J1 1 PIN 15 (LEAD #204) X1 TO X2 PRIMAR Y WINDINGS H1 TO H2 H1 T[...]

Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC F-30 NOTES F-30[...]

F-31 F-31 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR GAS (W A TER) SOLENOID TEST Service and repair should be performed by only Lincoln Electric factory trained personnel. U[...]

F-32 F-32 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR GAS (W A TER) SOLENOID TEST (continued) TEST PROCEDURE 1. Remove input power to the Precision TIG 275 machine. 2. Remove[...]

F-33 F-33 PRECISION TIG 275 TROUBLESHOOTING & REP AIR ST A TIC SCR 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 el[...]

F-34 F-34 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR ST A TIC SCR TEST (continued) TEST PROCEDURE 1. Remove main supply power to the PRECI- SION TIG 275 and remove the case [...]

F-35 F-35 PRECISION TIG 275 TROUBLESHOOTING & REP AIR ACTIVE SCR 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 oper ator and will invalidate your factory warranty . For your safety and to avoid ele[...]

F-36 F-36 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR ACTIVE SCR TEST (continued) TEST PROCEDURE 1. Remove main supply power to the PRECI- SION TIG 275 machine. 2. Locate and[...]

F-37 F-37 PRECISION TIG 275 TROUBLESHOOTING & REP AIR ACTIVE SCR TEST (continued) SW2 R2 R1 V A G C SCR under test 6 volt lantern battery + SW1 Figure F .8 - Active SCR T est Set-Up R1 = 4 ohms / 10 watts R2 = 3 ohms / 10 watts Resistor values are +/- 10% Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Re[...]

F-38 F-38 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR ACTIVE SCR TEST (continued) 6. Connect SCR into the test circuit as shown in Figure F .8. (A)Lead to anode (C) lead to c[...]

F-39 TROUBLESHOOTING & REP AIR F-39 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC 0V 5 ms 20V TYPICAL OUTPUT VOL T AGE W A VEFORM - MACHINE LOADED TO 2 AMPS DC - TIG MODE HIGH VOL T AGE/ HIGH FREQUENCY [...]

F-40 F-40 PRECISION TIG 275 TROUBLESHOOTING & REP AIR 0V 5 ms 20V TYPICAL OUTPUT VOL T AGE W A VEFORM - MACHINE LOADED TO 200 AMPS AC - TIG MODE HIGH VOL T AGE/ HIGH FREQUENCY can damage test equipment. Perform all voltage and waveform checks with high frequency circuit OFF . Perform High Frequency Disable Procedure. This is the typical AC outp[...]

F-41 F-41 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR 0V 5 ms 20V TYPICAL AC VOL T AGE W A VEFORM - MACHINE LOADED TO 50 AMPS AC - TIG MODE HIGH VOL T AGE/ HIGH FREQUENCY can[...]

F-42 F-42 PRECISION TIG 275 TROUBLESHOOTING & REP AIR 0V 5 ms 20V TYPICAL AC VOL T AGE W A VEFORM - MACHINE LOADED TO 2 AMPS AC - TIG MODE HIGH VOL T AGE/ HIGH FREQUENCY can damage test equipment. Perform all voltage and waveform checks with high frequency circuit OFF . Perform High Frequency Disable Procedure. This is the typical AC output vol[...]

F-43 F-43 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR 0V 5 ms 20V This is the typical AC output voltage waveform generated from a properly operating machine. Note that each v[...]

F-44 F-44 PRECISION TIG 275 NOTES Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

F-45 F-45 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR HIGH VOL T AGE TRANSFORMER REMOV AL AND REPLACEMENT Service and repair should be performed by only Lincoln Electric fact[...]

F-46 F-46 PRECISION TIG 275 TROUBLESHOOTING & REP AIR HIGH VOL T AGE TRANSFORMER REMOV AL AND REPLACEMENT (continued) REMOV AL PROCEDURE 1. Remove input power to the TIG 275 machine. 2. Using the 3/8” nut driver , remove the case sides and top. 3. Using a 3/8” nut driver , remove the case back. Note: The case back will be connected to the f[...]

F-47 F-47 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR HIGH VOL T AGE TRANSFORMER REMOV AL AND REPLACEMENT (continued) RE M O RE M O T E T E L O CAL L O CAL M AX I M UM  M [...]

F-48 NOTES F-48 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

F-49 F-49 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR CONTROL BOARD REMOV AL AND REPLACEMENT Service and repair should be performed by only Lincoln Electric factory trained p[...]

F-50 F-50 PRECISION TIG 275 TROUBLESHOOTING & REP AIR CONTROL BOARD REMOV AL AND REPLACEMENT (continued) REMOV AL PROCEDURE 1. Remove input power to the TIG 275 machine. 2. Using a 3/8” nut driver , remove the two screws from the top of the case front. See Figure F .12. 3. The top front control box cover can now be tilted forward to gain acce[...]

F-51 F-51 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR CONTROL BOARD REMOV AL AND REPLACEMENT (continued) J12 J11 J10 J9 J8 J6 J5 J4 Figure F .13 - Control Board Plug Location[...]

F-52 F-52 PRECISION TIG 275 NOTES Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

F-53 F-53 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR SCR BRIDGE ASSEMBL Y REMOV AL AND REPLACEMENT Service and repair should be performed by only Lincoln Electric factory tr[...]

F-54 F-54 PRECISION TIG 275 TROUBLESHOOTING & REP AIR SCR BRIDGE ASSEMBL Y REMOV AL AND REPLACEMENT (continued) REMOV AL PROCEDURE 1. Remove input power to the TIG 275 machine. 2. Using the 3/8” nut driver , remove the case sides and top. 3. Label and cut leads G1 and G2. See Figure F .14. 4. Label and cut leads G3 and G4. S ee Figure F .14. [...]

F-55 F-55 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR SCR BRIDGE REMOV AL AND REPLACEMENT (continued) Negative LIFT BAIL STABILIZER 217 B G4 G3 G2 G1 Pos. X1 Shunt 220A Bridg[...]

Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC F-56 F-56 TROUBLESHOOTING & REP AIR MOUNTING OF STUD TYPE DIODES T O ALUMINUM HEA T SINKS (CONT’D) DIODE STUD SIZE 3/4 - 16 3/8 - 24 1/4 - 28 FOOT - POUNDS 25-27 10±.5 INC[...]

F-57 F-57 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR POLARITY SWITCH REMOV AL AND REPLACEMENT Service and repair should be performed by only Lincoln Electric factory trained[...]

F-58 F-58 PRECISION TIG 275 TROUBLESHOOTING & REP AIR POLARITY SWITCH REMOV AL AND REPLACEMENT (continued) REMOV AL PROCEDURE 1. Remove the input to the PRECISION TIG 275 machine. 2. Using the 3/8” nut driver , remove the case sides and top. 3. Locate the polarity switch. See Figure F .15. 4. Using a 1/2”wrench label and disconnect leads B,[...]

F-59 F-59 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR SCR REMOV AL AND REPLACEMENT Service and repair should be performed by only Lincoln Electric factory trained personnel. [...]

F-60 F-60 PRECISION TIG 275 TROUBLESHOOTING & REP AIR SCR REMOV AL AND REPLACEMENT (continued) SPECIAL INSTRUCTIONS NOTE: Before disassembling the existing recti- fier , note toward which heat sink the outer metal ring of the power SCR is mounted. Also, note the positioning of the gate lead of the SCR. Failure to reinstall the new SCR in the sa[...]

F-61 F-61 PRECISION TIG 275 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REP AIR RETEST AFTER REP AIR Should a machine under test be rejected for any reason requiring the removal of any mechanical part[...]

F-62 NOTES PRECISION TIG 275 F-62 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC[...]

PRECISION TIG 275 Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC ELECTRICAL DIAGRAMS G-1 G-1 Electrical Diagrams Section ..........................................................................................Section G Wiring Diagram (Entire Machine) Code 10806 (G4031) .........................................[...]

ELECTRICAL DIAGRAMS G-2 PRECISION TIG 275 ® ® WIRING DIAGRAM - ENTIRE MACHINE - CODE 10806 (G4031) RECEPTACLE C A B B CONTROL PC BOAR D 10K A-B F E D C AT MINIMUM D F REMOTE TM AMPTROL OPTIONAL A E REMOTE A B C D E F + - G R G Y 5 4 3 2 1 (STICK) (AUTO BAL) (REMOTE) (P. FLOW) (THERMAL) 8 4 1 2 3 6 5 6 B W + - B W + - B W + - B W + - G 331 6 5 4 3[...]

ELECTRICAL DIAGRAMS G-3 PRECISION TIG 275 ® ® WIRING DIAGRAM - ENTIRE MACHINE - CODE 10807 (G4031-1) RECEPTACLE C A B B CONTROL PC BOAR D 10K A-B F E D C AT MINIMUM D F REMOTE TM AMPTROL OPTIONAL A E REMOTE A B C D E F + - G R G Y 5 4 3 2 1 (STICK) (AUTO BAL) (REMOTE) (P. FLOW) (THERMAL) 8 4 1 2 3 6 5 6 B W + - B W + - B W + - B W + - G 331 6 5 4[...]

ELECTRICAL DIAGRAMS G-4 PRECISION TIG 275 ® ® WIRING DIAGRAM - ENTIRE MACHINE - CODE 10893 (G4031-2) RECEPTACLE C A B B CONTROL PC BOAR D 10K A-B F E D C AT MINIMUM D F REMOTE TM AMPTROL OPTIONAL A E REMOTE A B C D E F + - G R G Y 5 4 3 2 1 (STICK) ( AUTO BAL) (REMOTE) (P. FLOW) (THERMAL) 8 4 1 2 3 6 5 6 B W + - B W + - B W + - B W + - G 331 6 5 [...]

ELECTRICAL DIAGRAMS G-5 PRECISION TIG 275 ® ® WIRING DIAGRAM - ENTIRE MACHINE - CODE 1 1 158 (G5692) RECEPTACLE C A B B 10K A-B F E D C MINIMUM D F TM AMPTROL A E REMOTE A B C D E F + - G R G Y 8 4 1 2 3 6 5 6 B W + - B W + - B W + - B W + - G 331 6 5 4 3 2 1 2 3 4 5 7 1 344 345 343 8 7 6 5 4 3 2 1 J23 J22 321 322 313 314 315 316 317 318 319 320 [...]

ELECTRICAL DIAGRAMS G-6 PRECISION TIG 275 ® ® WIRING DIAGRAM - ENTIRE MACHINE - CODE 1 1 159 (G5692-1) RECEPTACLE C A B B 10K A-B F E D C MINIMUM D F TM AMPTROL A E REMOTE A B C D E F + - G R G Y 8 4 1 2 3 6 5 6 B W + - B W + - B W + - B W + - G 331 6 5 4 3 2 1 2 3 4 5 7 1 8 7 6 5 4 3 2 1 J23 J22 321 322 313 314 315 316 317 318 319 320 311 312 J8[...]

Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC ELECTRICAL DIAGRAMS G-7 PRECISION TIG 275 ® ® SCHEMA TIC - ENTIRE MACHINE - BELOW CODE 1 1000 (G4075) XB -U F 01-2 9-02 NONE MACHI NE SCHEM ATI C PRECISION TIG 4075 TN TN 3-8-2[...]

ELECTRICAL DIAGRAMS G-8 PRECISION TIG 275 ® ® SCHEMA TIC - ENTIRE MACHINE - ABOVE CODE 1 1000 (G5691) EN-170 S O L ID E D G E ENGINEERING CONTROLLED MANUFACTURER: No RELEASE D FROM X A.02 G5691 PRECISION TIG MACHINE SC HEMATIC NONE G4075 bburkhart burkhart - DRAWN BY: DESIGN INFORMATIO N ENGINEER: APPROVED: REFERENCE: EQUIPMENT TYPE: SUBJECT: SCA[...]

ELECTRICAL DIAGRAMS G-9 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - BELOW CODE 1 1000 (G3908 P AGE 1) G-9 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Master[...]

ELECTRICAL DIAGRAMS G-10 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - BELOW CODE 1 1000 (G3908 P AGE 2) G-10 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

ELECTRICAL DIAGRAMS G-11 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - BELOW CODE 1 1000 (G3908 P AGE 3) G-11 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

ELECTRICAL DIAGRAMS G-13 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - ABOVE CODE 1 1000 (G4762 P AGE 1) G-13 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

ELECTRICAL DIAGRAMS G-14 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - ABOVE CODE 1 1000 (G4762 P AGE 2) G-14 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

ELECTRICAL DIAGRAMS G-15 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - ABOVE CODE 1 1000 (G4762 P AGE 3) G-15 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

ELECTRICAL DIAGRAMS G-16 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - ABOVE CODE 1 1000 (G4762 P AGE 4) G-16 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

ELECTRICAL DIAGRAMS G-17 PRECISION TIG 275 ® ® SCHEMA TIC - CONTROL PC BOARD - ABOVE CODE 1 1000 (G4762 P AGE 5) G-17 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return to Mast[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

ELECTRICAL DIAGRAMS G-21 PRECISION TIG 275 ® ® SCHEMA TIC-BYP ASS / ST ABILIZER P .C. BOARD (S22530-1) (CODE 10806 & 10807) 160J 320V TP1 600V .05 C8 5W 10 R1 250V 15 C9 600V .05 C6 600V .05 C7 600V .05 C5 600V .05 C2 600V .05 C3 600V .05 C4 600V .05 C1 GND GND CONNECTION MADE THROUGH SOLDER PAD CODE NUMBER. UNLESS OTHERWISE SPECIFIED) BOARD.[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

ELECTRICAL DIAGRAMS G-23 PRECISION TIG 275 ® ® SCHEMA TIC-BYP ASS AND CE P . C. BOARD (S24206) (CODE 10893) VOLTAGE NET .0047 440V C2 .0047 440V C1 2.2 275V C4 2.2 275V C3 B1 FRAME GROUND 9/29/97 LINE 2 (V) LINE 1 (U) DIODES = FRAME CONNECTION ( CODE NUMBER. GENERAL INFORMATION APM SUPPLY A PRINTED THIS DIAGRAM MAY NOT RESISTORS = Ohms ( (UNLESS [...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

ELECTRICAL DIAGRAMS G-25 PRECISION TIG 275 ® ® SCHEMA TIC - TIG OPTION P .C. BOARD - BELOW CODE 1 1000 (G4039 P AGE 1) G-25 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return t[...]

ELECTRICAL DIAGRAMS G-26 PRECISION TIG 275 ® ® SCHEMA TIC - TIG OPTION P .C. BOARD - BELOW CODE 1 1000 (G4039 P AGE 2) G-26 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return t[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

ELECTRICAL DIAGRAMS G-28 PRECISION TIG 275 ® ® SCHEMA TIC - TIG OPTION P .C. BOARD - ABOVE CODE 1 1000 (G4760 P AGE 1) G-28 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return t[...]

ELECTRICAL DIAGRAMS G-29 PRECISION TIG 275 ® ® SCHEMA TIC - TIG OPTION P .C. BOARD - ABOVE CODE 1 1000 (G4760 P AGE 2) G-29 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return t[...]

ELECTRICAL DIAGRAMS G-30 PRECISION TIG 275 ® ® SCHEMA TIC - TIG OPTION P .C. BOARD - ABOVE CODE 1 1000 (G4760 P AGE 3) G-30 NOTE: This diagram is for reference only . It may not be accurate for all machines covered by this manual. Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC Return to Master TOC Return t[...]

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 pro- vided for reference only . Lincoln Electric discourages board level troub[...]

Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC SVM ERROR REPORTING FORM We need to know if there are errors in our manuals. We also value any suggestions as to additional tests or procedures that would make this SVM a better tool for you. If you discover new or different “Problems or Symptoms” that are not c[...]