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LN-742
Lincoln LN-742 Manuals
Manuals and User Guides for Lincoln LN-742. We have
1
Lincoln LN-742 manual available for free PDF download: Service Manual
Lincoln LN-742 Service Manual (81 pages)
Wire Feeders
Brand:
Lincoln
| Category:
Welding System
| Size: 1.62 MB
Table of Contents
Electric Shock Can Kill
2
Safety
3
Table of Contents
6
Installation
8
Technical Specifications - LN-742
8
Mounting Location
9
Input Cable Connections
9
Work Cable
12
Gun and Cable Assemblies
12
Gun Cable Connections
12
Water Connections (for Water Cooled Guns
13
Shielding Gas Hookup
14
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section B Operating Instructions
15
Operation
16
Operating Instructions
16
Safety Precautions
16
General Description
16
Recommended Processes and Equipment
16
Controls and Settings
17
Acceleration Setting
18
English or Metric Speed Display Units
18
Circuit Protection
18
Drive Roll Installation
18
Changing Drive Rolls for Two-Roll Wire Feeders
18
Changing Drive Rolls for Four-Roll Wire Feeders
20
Idle Roll Pressure Setting
22
Wire Loading
23
Wire Reel Loading - Readi-Reels and Spools
23
Wire Reel Loading - 50 and 60 Lb Coils (K303 or K376 Wire Reel Stand
25
Making a Weld
26
Wire Loading - 13-14 Lb Innershield Coils
26
Wire Reel Changing
27
Accessories
30
General
30
Flux System Components
31
Power Input Cables
32
Welding Guns
32
Spindles, Stands, and Adapters
33
Attaching the Wire Reel Stand
34
Drive Roll Kits
34
Routine Maintenance
35
Maintenance
36
Routine Maintenance
36
Periodic Maintenance
36
Theory of Operation
38
General Description
38
Power Input Circuits
38
Trigger Circuit
39
Keypad, Display Board, Control Board, Reed Switch, Drive Motor and Tach Feedback
40
Troubleshooting and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section F How to Use Troubleshooting Guide
41
Troubleshooting and Repair
43
PC Board Troubleshooting Procedures
43
Troubleshooting Guide
44
Test Procedures
50
Tachometer Feedback Test
50
Drive Motor Test
52
Input Voltage Test
54
Keypad Resistance Test
58
Component Replacement Procedures
62
Wire Drive Assembly and Components Replacement
62
Swing Arm Assembly Replacement for Two-Roll Wire Feeders
66
Swing Arm Assembly Replacement for Four-Roll Wire Feeders
68
Gas Solenoid and Connections Replacement
71
Retest after Repair
74
Check Wire Feed Speed
74
Electrical Diagrams
77
Wiring Diagram
77
G2615 Control Board Schematic
78
G2615 Control Board Layout
79
L9122 Display Board Schematic
80
Electrical Diagrams
81
L9122 Display Board Layout
81
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