Page 2 - SAFETY; WARNING; CALIFORNIA PROPOSITION 65 WARNINGS; The Above For Diesel Engines
Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC i SAFETY i PRECISION TIG 185 FOR ENGINEpowered equipment. 1.a. Turn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running. ______________________________...
Page 3 - ii; ELECTRIC SHOCK can kill.
Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC ii SAFETY ii PRECISION TIG 185 ARC RAYS can burn. 4.a. Use a shield with the proper filter and cover plates to protect your eyes from sparks andthe rays of the arc when welding or observingopen arc welding. Heads...
Page 4 - iii
PRECISION TIG 185 SAFETY iii iii Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC FOR ELECTRICALLYpowered equipment. 8.a. Turn off input power using the disconnect switch at the fuse box before working onthe equipment. 8.b. Install equipment in accordance with ...
Page 5 - iv; PRÉCAUTIONS DE SÛRETÉ
PRECISION TIG 185 SAFETY iv iv Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC 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 le...
Page 6 - MASTER TABLE OF CONTENTS FOR ALL SECTIONS; RETURN TO MAIN MENU
PRECISION TIG 185 v v MASTER TABLE OF CONTENTS FOR ALL SECTIONS Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-iv Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 7 - TABLE OF CONTENTS
Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC PRECISION TIG 185 Section A-1 Section A-1 TABLE OF CONTENTS - INSTALLATION SECTION - Installation ..............................................................................................................Sect...
Page 8 - INSTALLATION; 00% Duty Cycle; INPUT - SINGLE PHASE ONLY; Using standard #8-3 input cable for protected
PRECISION TIG 185 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC A-2 INSTALLATION A-2 TECHNICAL SPECIFICATIONS - PRECISION TIG 185 (K2345-1AND K2347-1,-2) Volts at Rat...
Page 9 - PHYSICAL DIMENSIONS; AC or DC; OUTPUT RANGE; Machine Only
PRECISION TIG 185 INSTALLATION A-3 A-3 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TECHNICAL SPECIFICATIONS - CANADIAN (K2345-2), INTERNATIONAL K2346-1) MODEL HEIGH...
Page 10 - SAFETY PRECAUTIONS; GRINDING
PRECISION TIG 185 INSTALLATION A-4 A-4 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC SAFETY PRECAUTIONS SELECT SUITABLE LOCATION Place the welder where clean cooling ...
Page 11 - INPUT CONNECTIONS; Technical Specifications
PRECISION TIG 185 INSTALLATION A-5 A-5 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC The high frequency generator, being similar to a radiotransmitter, may cause radi...
Page 12 - INPUT RECONNECT PROCEDURE; CAUTION; FIGURE A.1 Reconnect Leads; OUTPUT CONNECTIONS; FIGURE A.2 Location of Output Connections
PRECISION TIG 185 INSTALLATION A-6 A-6 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC INPUT RECONNECT PROCEDURE On multiple input voltage welders, be sure the machinei...
Page 13 - WORK CABLE CONNECTION; • Keep cylinder away from areas; REMOTE CONTROL CONNECTION; section of
PRECISION TIG 185 INSTALLATION A-7 A-7 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC A PTA-17 Twist-Mate TIG welding torch with cable andconnector is supplied with th...
Page 14 - NOTES
PRECISION TIG 185 NOTES A-8 A-8 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC
Page 16 - OPERATION; have held combustibles.; INPUT POWER
PRECISION TIG 185 OPERATION B-2 B-2 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC ELECTRIC SHOCKcan kill. • Do not touch electrically live partsor electrode with skin...
Page 17 - PRODUCT DESCRIPTION; Enhanced version of the patented Micro-; RECOMMENDED PROCESSES; EQUIPMENT LIMITATIONS
PRECISION TIG 185 OPERATION B-3 B-3 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC PRODUCT DESCRIPTION The Precision TIG 185 is a member of our fieldacclaimed Precisio...
Page 18 - CONTROL FUNCTIONALITY; • Do not switch the polarity switch; CONTROLS AND SETTINGS
PRECISION TIG 185 OPERATION B-4 B-4 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC CONTROL FUNCTIONALITY 1. POWER SWITCH – Input line switch turns input power ON or OF...
Page 19 - PULSE TIG CONTROL –; OPERATING STEPS; WELDING IN TIG MODE
PRECISION TIG 185 OPERATION B-5 B-5 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC 8. PULSE TIG CONTROL – The Pulse TIG feature built into the Precision TIG 185 is sim...
Page 20 - REMOTE CONTROL OPERATION
PRECISION TIG 185 OPERATION B-6 B-6 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC REMOTE CONTROL OPERATION A Foot Amptrol ™is included with the PRECISION TIG185 Ready...
Page 21 - WELDING IN STICK MODE; Put the electrode holder and cable quick connect; • In Stick Mode the output terminal; Adjust the Current Control to the desired amps.; RECOMMENDED ELECTRODE AMPERAGE RANGES - PRECISION TIG 185; SMAW Process
PRECISION TIG 185 OPERATION B-7 B-7 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC WELDING IN STICK MODE 1. Put the electrode holder and cable quick connect plug into ...
Page 24 - ACCESSORIES; FACTORY INSTALLED OPTIONS; Water Cooled System
PRECISION TIG 185 ACCESSORIES C-2 C-2 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC FACTORY INSTALLED OPTIONS The Precision TIG 185 will be available in two Factory-C...
Page 25 - FIELD INSTALLED OPTIONS; assemblies and; • K2374-1 Electrode Holder and Cable
PRECISION TIG 185 ACCESSORIES C-3 C-3 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC FIELD INSTALLED OPTIONS The following Options/Accessories are available for thePre...
Page 28 - MAINTENANCE; ROUTINE AND PERIODIC MAINTENANCE; FAN MOTOR OR FAN BLADE REPLACEMENT
PRECISION TIG 185 MAINTENANCE D-2 D-2 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC SAFETY PRECAUTIONS ELECTRIC SHOCK can kill. • Only qualified personnel should per-...
Page 29 - FIGURE D.2 — LOCATION OF MAINTENANCE COMPONENTS.
PRECISION TIG 185 MAINTENANCE D-3 D-3 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC FIGURE D.2 — LOCATION OF MAINTENANCE COMPONENTS. 1 9 5 8 8 3 6 2 4 7 1. Case Front...
Page 31 - BLOCK LOGIC DIAGRAM
Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC X Section E-1 Section E-1 Theory of Operation ...............................................................................................Section E General Description ............................................
Page 32 - THEORY OF OPERATION; INPUT POWER CIRCUIT; FIGURE E.2 Main Transformer and Input Power; GENERAL DESCRIPTION; Enhanced version of the patented MicroStartTM
PRECISION TIG 185 THEORY OF OPERATION E-2 E-2 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC INPUT POWER CIRCUIT The desired single-phase input power is connected toth...
Page 33 - SCR Operation; FIGURE E.3 Control Board and Output Feedback Control.
PRECISION TIG 185 THEORY OF OPERATION E-3 E-3 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC OUTPUT RECTIFICATION ANDFEEDBACK CONTROL The AC output from the main trans...
Page 35 - DC WELDING OUTPUT; FIGURE E.5 DC Welding Current Generation.; CHOKE
PRECISION TIG 185 THEORY OF OPERATION E-5 E-5 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC DC WELDING OUTPUT When the polarity switch is placed in either DC position...
Page 36 - AC WELDING OUTPUT; wave is developed and applied to the output terminals.; FIGURE E.6 AC Square Wave Welding Current Generation.
PRECISION TIG 185 THEORY OF OPERATION E-6 E-6 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC AC WELDING OUTPUT Rotating the polarity switch to the AC position changes ...
Page 37 - SCR OPERATION; FIGURE E.7 SCR Operation
PRECISION TIG 185 THEORY OF OPERATION E-7 E-7 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC SCR OPERATION A silicon controlled rectifier (SCR) is a three terminaldevi...
Page 38 - PROTECTIVE CIRCUITS; THERMAL PROTECTION; If the welder; OVERLOAD PROTECTION
PRECISION TIG 185 THEORY OF OPERATION E-8 E-8 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC PROTECTIVE CIRCUITS Protective circuits are designed into the PRECISIONTIG...
Page 39 - Test Procedures
Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC PRECISION TIG 185 Section F-1 Section F-1 TABLE OF CONTENTS - TROUBLESHOOTING & REPAIR SECTION - Troubleshooting & Repair Section ........................................................................Se...
Page 40 - TROUBLESHOOTING & REPAIR; The; Step 3. PERFORM COMPONENT TESTS; HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-2 F-2 CAUTION This Troubleshooting Guide is provided to helpyou locate ...
Page 41 - PC board can be damaged by static electricity.; PC BOARD TROUBLESHOOTING PROCEDURES
PRECISION TIG 185 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING & REPAIR F-3 F-3 Sometimes machine failures appear to be due to PCboard failures. ...
Page 42 - TROUBLESHOOTING GUIDE
Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING & REPAIR F-4 F-4 PRECISION TIG 185 CAUTION If for any reason you do not understand the test procedur...
Page 43 - OUTPUT PROBLEMS; T1 Transformer
Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING & REPAIR F-5 F-5 TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the beginning of this m...
Page 44 - Observe Safety Guidelines
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-6 F-6 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the b...
Page 46 - TIG MODE PROBLEMS; Reconnect Procedure
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-8 F-8 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the b...
Page 47 - SCR Bridge Test
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-9 F-9 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the b...
Page 48 - TIG WELDING PROBLEMS; Maintenance
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-10 F-10 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the...
Page 49 - Technical
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-11 F-11 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the...
Page 52 - STICK WELDING PROBLEMS
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-14 F-14 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING GUIDE Observe Safety Guidelines detailed in the...
Page 53 - TEST DESCRIPTION; This procedure will; MATERIALS NEEDED; /64” Allen type wrench
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-15 F-15 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Service and repair should be performed by only Lincoln Electric...
Page 54 - PROCEDURE; Remove input power to the TIG185; Visually check to make; When voltage testing and scope; HIGH FREQUENCY CIRCUIT DISABLE PROCEDURE; LEFT SIDE OF MACHINE; FIGURE F.1 SPARK GAP ASSEMBLY
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-16 F-16 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC PROCEDURE 1. Remove input power to the TIG185 machine. 2. Using...
Page 55 - T1 TRANSFORMER TEST; This procedure will determine if; Precision TIG 185 Wiring Diagrams
Service and repair should be performed by only Lincoln Electric factory trainedpersonnel. Unauthorized repairs performed on this equipment may result in dangerto the technician or machine operator and will invalidate your factory warranty. Foryour safety and to avoid electrical shock, please observe...
Page 56 - T1 TRANSFORMER; TEST PROCEDURE; Remove main supply power to the
PRECISION TIG 185 F-18 F-18 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING & REPAIR T1 TRANSFORMER TEST (continued) TEST PROCEDURE 1. Remove main s...
Page 57 - Main Transformer and Output
PRECISION TIG 185 F-19 F-19 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING & REPAIR T1 TRANSFORMER TEST (continued) 6. If all of the secondary volt...
Page 59 - This procedure
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-21 F-21 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Service and repair should be performed by only Lincoln Electric...
Page 60 - STATIC SCR TEST; PLUG J2 REMOVED; Figure F.3 - Plug J2 Location on Control Board
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-22 F-22 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TEST PROCEDURE 1. Remove main supply power to the TIG 185 and r...
Page 61 - Using an analog ohmmeter test the; FIGURE F.4 SCR TEST POINTS
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-23 F-23 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC 3. Using an analog ohmmeter test the resistance from anode to c...
Page 63 - An SCR tester as outlined in this procedure.
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-25 F-25 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Service and repair should be performed by only Lincoln Electric...
Page 64 - ACTIVE SCR TEST; FIGURE F.5 ACTIVE SCR TEST SETUP
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-26 F-26 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TEST PROCEDURE 1. Remove main supply power to the TIG 185 machi...
Page 65 - Connect SCR into the test circuit as; FIGURE F.6 SCR GATE LOCATIONS
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-27 F-27 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC 6. Connect SCR into the test circuit as shown (A) lead to anode...
Page 67 - NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM; AC TIG MODE
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-29 F-29 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM AC TIG MODE CAUTION HIGH V...
Page 68 - DC TIG MODE
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-30 F-30 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM DC TIG MODE CAUTION HIGH V...
Page 69 - AC STICK MODE
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-31 F-31 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM AC STICK MODE CAUTION HIGH...
Page 70 - DC STICK MODE
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-32 F-32 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM DC STICK MODE CAUTION HIGH...
Page 71 - TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-33 F-33 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED AC TIG MODE CA...
Page 75 - ABNORMAL OPEN CIRCUIT VOLTAGE - DC TIG MODE
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-37 F-37 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC ABNORMAL OPEN CIRCUIT VOLTAGE - DC TIG MODE ONE OUTPUT SCR NOT ...
Page 77 - TROUBLESHOOTING AND REPAIR; Needle nose pliers
PRECISION TIG 185 F-39 F-39 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING AND REPAIR Service and repair should be performed by only Lincoln Electric f...
Page 78 - SCR BRIDGE ASSEMBLY; Remove input power to the TIG 185; FIGURE F.7 CASE BACK MOUNTING SCREWS
PRECISION TIG 185 F-40 F-40 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING AND REPAIR SCR BRIDGE ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE (Continued)...
Page 79 - Remove plug J2 from the control; FIGURE F.8 FRONT PANEL MOUNTING SCREWS
PRECISION TIG 185 F-41 F-41 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC TROUBLESHOOTING AND REPAIR SCR BRIDGE ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE (Continued)...
Page 80 - FIGURE F.9 PLUG J2 ON CONTROL BOARD; FIGURE F.10 DIODE PIGTAIL CONNECTION TO POLARITY SWITCH LEAD.
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-42 F-42 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC SCR BRIDGE ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE (Continue...
Page 81 - REPLACEMENT PROCEDURE; Figure
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-43 F-43 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC SCR BRIDGE ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE (Continue...
Page 83 - Phillips head screwdriver; POLARITY SWITCH
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-45 F-45 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Service and repair should be performed by only Lincoln Electric...
Page 84 - REMOVAL PROCEDURE
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-46 F-46 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC POLARITY SWITCH REMOVAL AND REPLACEMENT PROCEDURE (Continued) R...
Page 87 - HIGH VOLTAGE TRANSFORMER
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-49 F-49 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Service and repair should be performed by only Lincoln Electric...
Page 88 - FIGURE F.11 SECONDARY LEADS AT HIGH FREQUENCY STARTER BOARD
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-50 F-50 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC REMOVAL PROCEDURE 1. Remove input power to the TIG 185 machine....
Page 89 - Carefully position the new high volt-; FIGURE F.12 HIGH VOLTAGE TRANSFORMER MOUNTING INSULATORS
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-51 F-51 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC HIGH VOLTAGE TRANSFORMER REMOVAL AND REPLACEMENT PROCEDURE (Con...
Page 91 - Wire cutters; MAIN TRANSFORMER AND OUTPUT CHOKE ASSEMBLY
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-53 F-53 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Service and repair should be performed by only Lincoln Electric...
Page 93 - SCR Bridge
PRECISION TIG 185 TROUBLESHOOTING & REPAIR F-55 F-55 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC MAIN TRANSFORMER AND OUTPUT CHOKE ASSEMBLY REMOVAL AND REPLACEM...
Page 95 - RETEST AFTER REPAIR; Maximum Idle Amps
PRECISION TIG 185 TROUBLESHOOTING AND REPAIR F-57 F-57 Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Section TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC Retur n to Master TOC RETEST AFTER REPAIR Should a machine under test be rejected for a...
Page 98 - ELECTRICAL DIAGRAMS; VOLTAGE RECONNECTION
ELECTRICAL DIAGRAMS G-2 PRECISION TIG 185 WIRING DIAGRAM - ENTIRE MACHINE - (G4549) G4549 B SCR4 SCR2 SCR1 D C B A REAR GANG L1 ELECTRODE T3 NC NO MICRO-SWIT CH T2 L2 L3 C3 SCR3 H1 H G 311A 312A OPENCLOSEDCLOSED G4 216 G3 218 G2 G1 217 220 AC E F PC BOARD CONTROL PC BOARD D1 S2 SV1 GAS VALVE S2A BYP...
Page 103 - OPPOSITE COMPONENT SIDE
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....
Page 104 - SVM ERROR REPORTING FORM; Please give detailed description below:
SVM ERROR REPORTING FORM We need to know if there are errors in our manuals. We also value any suggestions as toadditional 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 covered in the three col-umn troubleshoo...
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